Journal of Saudi Chemical Society最新文献

{"title":"Effect of Ni/Co ratio on Ce-Sc-ZrO2 catalysts for selective H2 production via methane partial oxidation","authors":"Norah Alwadai ,&nbsp;Ahmed S. Al-Fatesh ,&nbsp;Kenit Acharya ,&nbsp;Abdulaziz A.M. Abahussain ,&nbsp;Salma A. Al-Zahrani ,&nbsp;Anis H. Fakeeha ,&nbsp;Naif Alarifi ,&nbsp;Khaled M. Banabdwin ,&nbsp;Ahmed A. Ibrahim ,&nbsp;Rawesh Kumar","doi":"10.1016/j.jscs.2024.101948","DOIUrl":"10.1016/j.jscs.2024.101948","url":null,"abstract":"<div><div>Partial oxidation of methane (POM) is a promising route for hydrogen production, and achieving a high H₂ yield with an H₂/CO ratio &gt;3 is highly appealing. Optimization of Ni/Co ratios over Ce-Sc-ZrO₂ (CSZ) is investigated for POM reaction and characterized by X-ray diffraction, Raman spectroscopy, temperature-programmed reduction/oxidation/desorption, and transmission electron microscopy. The active site derived from the reduction of “strongly interacted NiO” is responsible for the dissociation of C–H (of CH₄), resulting high activity towards POM. 5Ni/CSZ has the highest amount of such active sites and attains the highest activity. 5Co/CSZ catalyst has cobalt-based active sites, and there is an inert carbon deposit during the reaction, causing the least activity. 3.75 wt% Ni and 1.25 wt% Co combination over CSZ support surges the highest density of basicity, oxide vacancy, and adequate amount of active sites derived from “strongly interacted NiO”. The active sites with enhanced metal-support interaction are further grown under exposure to oxidizing gas (O₂) and reducing gas (H₂) during the POM reaction. The highest density of basicity and oxide vacancy involves more CO₂ and H₂O in the sequential oxidation of CH₄ under indirect pathways. The exclusive involvement of indirect pathways of POM and inhibition of hydrogen consuming reaction (like reverse water gas shift reaction) over 3.75Ni1.25Co/CSZ results into 48 % H₂ yield and 3.26 H₂/CO ratio up to 24 h time on stream at 600 °C. The H₂ yield doubles to ∼97 %, and the H₂/CO ratio comes close to 2 over 3.75Ni1.25Co/CSZ catalyst at 900 °C.</div></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101948"},"PeriodicalIF":5.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating adsorption and removal of divalent Ca2+ and Pb2+ ions from aqueous solutions by gamma-irradiation using quartz tuning fork (QTF) sensor technique","authors":"Reem Alanazi ,&nbsp;Shofiur Rahman ,&nbsp;Mahmoud Al-Gawati ,&nbsp;Khalid E. Alzahrani ,&nbsp;Nahed Alarifi ,&nbsp;Nadyah Alanazi ,&nbsp;Abdullah N. Alodhayb","doi":"10.1016/j.jscs.2024.101947","DOIUrl":"10.1016/j.jscs.2024.101947","url":null,"abstract":"&lt;div&gt;&lt;div&gt;In this study, gold-coated quartz tuning forks (QTFs) sensing devices functionalized with self-assembled monolayers (SAM) of a lower-rim functionalized calix[4]arene methoxy ester were used for the detection of divalent Ca&lt;sup&gt;2+&lt;/sup&gt; and Pb&lt;sup&gt;2+&lt;/sup&gt; ions in aqueous solutions by utilizing adsorption behavior and the radiative effect. The gold-coated QTF functionalized calix[4]arene methoxy ester sensing device was tested by measuring the respective frequency shifts obtained using small (60 µL) samples of aqueous PbCl&lt;sub&gt;2&lt;/sub&gt; at two different concentrations (10&lt;sup&gt;−6&lt;/sup&gt; and 10&lt;sup&gt;−4&lt;/sup&gt; M). For 10&lt;sup&gt;−4&lt;/sup&gt; M solutions of PbCl&lt;sub&gt;2&lt;/sub&gt;, results showed that the resonance frequency shift Δf = 317 Hz, from 32,867 Hz (f&lt;sub&gt;Calix&lt;/sub&gt;) to 32,550 Hz (f&lt;sub&gt;Calix⊃Pb&lt;sup&gt;2+&lt;/sup&gt;&lt;/sub&gt;) due to the absorption of lead (Pb&lt;sup&gt;2+&lt;/sup&gt;) ions (10&lt;sup&gt;-4&lt;/sup&gt; M) by calixl[4]arene methoxy ester receptor molecules on the QTF sensing layer from the aqueous solution to forming the ([Calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) complex. The most significant frequency changes were observed at a concentration of 10&lt;sup&gt;−6&lt;/sup&gt; M CaCl&lt;sub&gt;2&lt;/sub&gt;, where CaCl&lt;sub&gt;2&lt;/sub&gt; exhibited the biggest change of 356 Hz, from 32,893 Hz (f&lt;sub&gt;Calix&lt;/sub&gt;) to 32,537 Hz (f&lt;sub&gt;Calix⊃Ca&lt;sup&gt;2+&lt;/sup&gt;&lt;/sub&gt;), compared to 317 Hz for PbCl&lt;sub&gt;2&lt;/sub&gt; (10&lt;sup&gt;−4&lt;/sup&gt; M). The limit of detection was 100 femtomolar (fM) for CaCl&lt;sub&gt;2&lt;/sub&gt; and 245 fM for PbCl&lt;sub&gt;2&lt;/sub&gt;. After that, we irradiated the receptor molecules which was holding Pb&lt;sup&gt;2+&lt;/sup&gt; ions in the complex ([calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) on the QTF sensing layer with a radiation dose ranging from 7.5 to 50 µGy of gamma rays from the Cesium-137 source for 30 min. Interestingly, it was observed that the resonance frequency shift (Δf = 54 Hz) back to 32,604 Hz from 32,550 Hz (f&lt;sub&gt;(Calix⊃Pb&lt;sup&gt;2+&lt;/sup&gt;)&lt;/sub&gt;), which strongly suggests that the Pb&lt;sup&gt;2+&lt;/sup&gt; ion removed from ([calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) complex on the QTF sensing layer due to gamma radiation dose. To follow up on the radiation effect of the ([calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) on the QTF sensing layer, we stopped the gamma radiation source and kept it for an additional 10 min to see if there was any resonance frequency. It was noticed that an additional resonance frequency shifted (Δf = 33 Hz) back to 32,637 Hz from 32,604 Hz after stopping the gamma radiation source for 10 min. We assume that the complex ([calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) absorbs the gamma radiation and continues the removal of Pb&lt;sup&gt;2+&lt;/sup&gt; ions from the complex on the sensing layer. A similar phenomenon was also observed for the absorption of lead (Pb&lt;sup&gt;2+&lt;/sup&gt;) ions (10&lt;sup&gt;-6&lt;/sup&gt; M) by calix[4]arene methoxy ester receptor molecules on the QTF sensing layer from the aqueous solution to forming the ([Calix ⊃ Pb&lt;sup&gt;2+&lt;/sup&gt;]) complex. The resonance frequency shift Δf = 142 Hz, from 32,706 Hz (f&lt;sub&gt;Calix&lt;/sub&gt;) to 32,564 Hz (f&lt;sub&gt;Calix⊃Pb&lt;sup&gt;2+&lt;/sup&gt;&lt;/sub&gt;) due to the absorption o","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101947"},"PeriodicalIF":5.8,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile and controllable hybrid-nanoengineering of MWCNTs/Au@ZIF-8 and AuPt@CeO2 based sandwich electrochemical aptasensor for AFB1 determination in foods and herbs","authors":"Liang Guo ,&nbsp;Shijin Zhou ,&nbsp;Yanju Liu ,&nbsp;Huaixia Yang ,&nbsp;Mingsan Miao ,&nbsp;Wei Gao","doi":"10.1016/j.jscs.2024.101946","DOIUrl":"10.1016/j.jscs.2024.101946","url":null,"abstract":"<div><div>Herein, a sandwich electrochemical sensing strategy for aflatoxin b₁ (AFB₁) detection based on hybrid-nanoengineering was presented. First, Au nanoparticle was doped into zeolitic imidazolate framework-8 (ZIF-8) to form Au@ZIF-8 by in-situ growth method, followed by multi-walled carbon nanotubes (MWCNTs) addition to synthesize MWCNTs/Au@ZIF-8 via self-assembly. The structural “confinement effect” of ZIF-8 afforded a microenvironment for Au nanoparticles and SMCNTs in a certain spatial region, giving MWCNTs/Au@ZIF-8 excellent electrochemical property as the substrate material. In addition, Au-Pt bimetallic nanoparticle, which exhibited excellent stability and catalytic activity was loaded on the hollow cerium oxide (CeO₂) to form AuPt@CeO₂ nanoparticle through one-step aqueous phase reduction. Owning to its high surface-to-volume ratio, satisfied electron transfer efficiency and biocompatibility, massive toluidine blue (TB) and AFB₁ antibody (Ab) could be modified on the AuPt@CeO₂ to form AuPt@CeO₂-Ab-TB, which acted as signal tag for the ultrasensitive assay of AFB₁. The proposed electrochemical sensing system exhibited wide detection range (2 × 10^-5 − 20 ng/mL) and low detection limit (2.13 fg/mL), which has been successfully applied to AFB₁ determination in four real samples. The hybrid nanoengineering presented in this work is an active attempt to prepare high-performance substrate material and signal tag, which provides a new insight for the development of highly sensitive and specific electrochemical sensing systems.</div></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101946"},"PeriodicalIF":5.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discovery of tetrazole thioethers: An efficient, environmentally friendly and metal-free S-arylation using diaryliodonium salts","authors":"Xiaogang Li ,&nbsp;Xuesong Wang ,&nbsp;Yan Wang ,&nbsp;Yinfeng Tan ,&nbsp;Dong Liu ,&nbsp;Xueying Zhang ,&nbsp;Youbin Li ,&nbsp;Junyu Xu","doi":"10.1016/j.jscs.2024.101943","DOIUrl":"10.1016/j.jscs.2024.101943","url":null,"abstract":"<div><div>An efficient, environmentally friendly, and metal-free method for the synthesis of functionalized tetrazole thioethers via the S-arylation of tetrazole-5-thiones using diaryliodonium salts as aryl transfer reagents has been developed. This novel methodology provides rapid access to tetrazole thioether derivatives under facile conditions. Our study underscores the chemoselectivity of unsymmetrical diaryliodonium salts, emphasizing their preference for the transfer of sterically hindered and electron-deficient aryl groups. Notably, the synthesized compound <strong>3h</strong> exhibits antitumor activity against A2780 (ovarian cancer) and MDA-MB-231 (breast cancer) tumor cells. In silico studies predict these compounds to possess good drug-likeness and low toxicity risk. These findings highlight the potential of functionalized tetrazole thioethers as antiproliferative agents and pave the way for further development and optimization in future investigations.</div></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101943"},"PeriodicalIF":5.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cu(II) complex heterogenized on magnetic mesoporous nanocomposite (SBA-16@Fe3O4) as an efficient catalyst for the reduction of nitro compounds","authors":"Yuanlin Shi","doi":"10.1016/j.jscs.2024.101944","DOIUrl":"10.1016/j.jscs.2024.101944","url":null,"abstract":"<div><div>In the present study, a novel magnetic heterogeneous copper catalyst was developed by the immobilization of a Cu(II) complex on the surface of magnetic mesoporous nanocomposite (SBA-16@Fe₃O₄) through post-synthetic method. The synthesized catalyst was analyzed by various characterization methods including FT-IR, EDS, XRD, Nitrogen physisorption, TEM, TGA, VSM, and ICP-OES. After complete characterization, its catalytic efficiency was evaluated in the hydrogenation of nitroarenes to amines. Taking the nitrobenzene reduction of as an example of a reaction, the reaction conditions were optimized by changing diverse parameters like solvent, temperature, time, amount of catalyst, as well as the type and amount of hydrogen source. The catalyst revealed highly efficient catalytic activity in the hydrogenation of numerous nitroarenes to the corresponding aminoarenes in pure water as the solvent with sodium borohydride as a H₂ source at room temperature. Additionally, the catalyst could be simply recovered from the mixture of reaction via magnetic separation and was able to mediate the reaction for multiple times with undiminished catalytic performance.</div></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101944"},"PeriodicalIF":5.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Sn-ZnO nanostructures on MgO<0001> by hybrid pulsed laser ablation and RF magnetron sputtering tandem system for CO gas-sensing application","authors":"Joselito P. Labis ,&nbsp;Hamad A. Albrithen ,&nbsp;Muhammad Ali Shar ,&nbsp;Abdulaziz Alhazaa ,&nbsp;Ahmed Algarni ,&nbsp;Mohammad A. Alduraibi ,&nbsp;Ahamad Imran ,&nbsp;Ahmed Mohamed El-Toni","doi":"10.1016/j.jscs.2024.101941","DOIUrl":"10.1016/j.jscs.2024.101941","url":null,"abstract":"<div><p>An exceptional method of incorporating Sn ions into Zinc Oxide (ZnO) using a tandem system of Pulsed Laser Deposition (PLD) and Radio-Frequency Magnetron Sputtering (RFMS) to synthesize and functionalize ZnO nanostructures is demonstrated in this study for gas-sensing application. The RFMS power was varied up to 50 W to sputter a pure Sn metal target, while simultaneously or successively growing ZnO nanostructures on a templated MgO &lt; 0001 &gt; substrate and on an Au-plated Al₂O₃ gas sensor, via PLD process at the substrate temperature of 700 °C in 100–500 millitorr oxygen/argon gas background. The morphologies of the grown Sn-ZnO nanostructures were characterized by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and X-ray Diffraction (XRD), and while their chemical/oxidation states and optical properties were analyzed by X-ray photospectroscopy (XPS) and photoluminescence (PL), respectively. For simultaneous deposition, the resulting (0002)-dominated 2D grain-like ZnO nanostructures were influenced by the interaction of the dynamic PLD plasma with static RFMS plasma at different powers. For successive growth, at 50 W-RF power, a remarkable increase in the sensor response to 50-ppm carbon monoxide (CO) gas was observed at 250 °C, which could be attributed to the creation of more adsorption sites in the Sn-ZnO depletion region caused by the replacement of some Zn sites with Sn ions in the ZnO matrix. This study, therefore, exhibits the viability of this hybrid system to design, synthesize, and functionalize Sn-ZnO nanomaterials, either by simultaneous/successive deposition, for gas-sensing applications.</p></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101941"},"PeriodicalIF":5.8,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1319610324001364/pdfft?md5=fc3853e1510a40089b4ca396d1eceb54&pid=1-s2.0-S1319610324001364-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pine sawdust immobilized zeolitic imidazolate framework-67 derived magnetic composites: An efficient and recycable adsorbent for norfloxacin removal","authors":"Yu Zheng ,&nbsp;Qing Shen ,&nbsp;Jie Gao ,&nbsp;Tian Liang ,&nbsp;Xiao-Bing Han ,&nbsp;Yuan Zhao ,&nbsp;Tao Chen","doi":"10.1016/j.jscs.2024.101939","DOIUrl":"10.1016/j.jscs.2024.101939","url":null,"abstract":"<div><p>Antibiotic contamination is a global environmental problem. The emerging contaminant norfloxacin (NOR) may increase the risk of drug resistance and thereby harm human health. The practical application of metal–organic framework crystals is usually limited by their powder form and difficulty in recovery. In this study, a magnetic Co-MPS-800 composite was prepared from carbonization with ZIF-67@pine sawdust, and significantly raised the NOR removing ability from wastewater. The changes in functional group composition, elemental contents, morphology, thermal stability and adsorption mechanism of the magnetic Co-MPS-800 composite were interpreted using FT-IR, XRD, SEM, BET, TGA and XPS. The Co-MPS-800 has an isoelectric point of 9.15 and a large specific surface area (174.58 m²·g⁻¹). The impacts of pH, contact time, temperature and dosage on the performance of Co-MPS-800 were also studied. The adsorption capacity over NOR reached 221.98 mg·g⁻¹ at 303 K, pH=6.0. The NOR adsorption is best suited a pseudo-2nd-order kinetic model and the Freundlich isotherm. Co-MPS-800 also had excellent reusability, and the removal rate reached 82.94 % after four repeated uses. Therefore, the magnetic Co-MPS-800 composite is effective in removing NOR from aqueous solutions. Altogether, this functional MOF-derived porous carbon may serve as a promising pollutant biosorbent, and its preparation strategy may provide insights for future studies.</p></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101939"},"PeriodicalIF":5.8,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1319610324001340/pdfft?md5=1707ff61c413333dede1f1e4a46b7817&pid=1-s2.0-S1319610324001340-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabricating 3D hierarchical hollow CoAl-LDHs@CoSx-rGO ball-flower for degrading sulfamethoxazole via visible-light coupling PMS activation: Performance and mechanism insight","authors":"Tao Wu ,&nbsp;Wanyue Wang ,&nbsp;Jiacheng Huang ,&nbsp;Xin Ren ,&nbsp;Xuesong Zhao ,&nbsp;Tianyu Zhou","doi":"10.1016/j.jscs.2024.101940","DOIUrl":"10.1016/j.jscs.2024.101940","url":null,"abstract":"<div><p>Sulfamethoxazole (SMX) is an extensively applied antibacterial drug, and it is also a pollutant that poses a serious threat to human and ecosystem health. In this research, a 3D hierarchical hollow ball-flower structure catalyst (CoAl-LDHs@CoS_x-rGO) was tailored for the first time to efficiently degrade SMX via visible light coupling PMS activation. A series of characterizations confirm that the target catalyst is successfully prepared and the optimized 0.1CoAl-LDHs@CoS_x-rGO sample possesses superior specific surface area of 306.0 m²/g, and significantly higher photocurrent response and lower electrochemical impedance. More importantly, 0.5 g/L of the sample can degrade 98.59 % of SMX within 50 min via visible light coupling PMS activation, and after 7 degradation cycles, the degradation rate only decreased by 8.49 %. A series of parameters that affect degradation rate have been optimized in detail. Capture experiments and ESR indicate that e⁻, •OH and SO₄^•− make major contributions to degradation, and visible light coupling PMS activation generates stronger signals than alone visible-light or PMS system. LC-MS, TEST toxicity assessment and theoretical calculation were conducted to elucidate degradation route and intermediate toxicity. The research provides a new approach to design catalysts with highly exposed activity sites for efficiently removing SMX from environmental water.</p></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101940"},"PeriodicalIF":5.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1319610324001352/pdfft?md5=469ab44a6f756711939d39388f5c6f01&pid=1-s2.0-S1319610324001352-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The promotion effects of alkaline earth metals on the properties of Cr/η-Al2O3 catalysts for propane dehydrogenation","authors":"Hamid Karami ,&nbsp;Saeed Soltanali ,&nbsp;Mozhdeh Amanati ,&nbsp;Weiyu Song ,&nbsp;Jian Liu ,&nbsp;Khashayar Sharifi","doi":"10.1016/j.jscs.2024.101929","DOIUrl":"10.1016/j.jscs.2024.101929","url":null,"abstract":"<div><p>The Cr/Al₂O₃ catalyst, a prevalent system in commercial applications, plays a significant role in propane dehydrogenation (PDH). Notable improvements in this catalyst’s efficiency are essential for its continued use. In order to examine the effect of alkaline earth metals on the catalyst performances in the propane dehydrogenation reaction, a series of Cr/η-Al₂O₃ were synthesized by the impregnation method. The synthesized catalysts were designated as Cr-T/η-Al₂O₃, where T represents Ca, Mg, Sr, and Ba. The supports and the catalysts were studied using the following techniques: XRD, N₂ adsorption–desorption, temperature-programmed desorption and reduction, UV–Vis and Raman spectroscopy, and XPS analyses. The findings reveal that the Cr-Ba/η-Al₂O₃ catalyst exhibits better catalytic performance, with significantly higher propane conversion and propylene selectivity (with initial values of 66 % and 86.2 %, respectively) compared to other catalysts. The enhanced performance is attributed to the increased dispersion of Cr species, stabilization of Cr⁶⁺ species, and reducing the total amount of acid sites and strong acid sites, which are crucial for maintaining active sites and minimizing coke deposition. The Ba-modified catalyst also demonstrated excellent stability, with a lower deactivation rate (Ba(0.201 h⁻¹) &lt; Sr(0.213 h⁻¹) &lt; Ca(0.270 h⁻¹) &lt; Mg(0.310 h⁻¹) &lt; parent(0.338 h⁻¹)) and robust regenerative capacity over multiple cycles.</p></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101929"},"PeriodicalIF":5.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1319610324001248/pdfft?md5=b9e04321a7b244f955cc3a5fe82425e8&pid=1-s2.0-S1319610324001248-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142164136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High durable SPEEK/TiO2 nanopaper composite membrane for vanadium redox flow battery","authors":"Song Il Han,&nbsp;Song Hyok Jon,&nbsp;Un Hyang Kim,&nbsp;Gang Hyok Kim,&nbsp;Sang Mo Jon","doi":"10.1016/j.jscs.2024.101931","DOIUrl":"10.1016/j.jscs.2024.101931","url":null,"abstract":"<div><p>Sulfonated poly (ether ether ketone) (SPEEK) ion exchange membranes for VRFB are promising alternatives to Nafion, but require improved mechanical and chemical stability for long-term operation. Here, we have fabricated composite membranes using SPEEK as proton conductive medium and TiO₂ nanopapers as reinforcing framework to improve the mechanical and chemical stabilities of SPEEK membranes. The SPEEK/TiO₂ nanopaper composite membranes exhibited almost twice the tensile strength and only one-third the vanadium ion permeability compared to pristine SPEEK (DS=60 %). Due to the excellent cell performance such as high EE, slow capacity degradation and long-term lifetime, these high durable composite membranes could be found their potential use as ion exchange membranes for commercial VRFBs.</p></div>","PeriodicalId":16974,"journal":{"name":"Journal of Saudi Chemical Society","volume":"28 6","pages":"Article 101931"},"PeriodicalIF":5.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1319610324001261/pdfft?md5=8fbb588597f96e1f8e783317eeca9d06&pid=1-s2.0-S1319610324001261-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142172952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}