Catalysts最新文献_第6页

Co-Encapsulation of Rhenium and Ruthenium Complexes into the Scaffolds of Metal–Organic Framework to Promote CO2 Reduction 将铼和钌复合物共封入金属有机框架支架以促进二氧化碳还原

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-14 DOI: 10.3390/catal13121510

Zhi-You Su, Baolan Yu, Jianxin Feng, Maoling Zhong, Xuan Li, Jianying Shi

{"title":"Co-Encapsulation of Rhenium and Ruthenium Complexes into the Scaffolds of Metal–Organic Framework to Promote CO2 Reduction","authors":"Zhi-You Su, Baolan Yu, Jianxin Feng, Maoling Zhong, Xuan Li, Jianying Shi","doi":"10.3390/catal13121510","DOIUrl":"https://doi.org/10.3390/catal13121510","url":null,"abstract":"The molecular complexes of Re(4,4′-dcbpy)(CO)3Cl (dcbpy = dicarboxylicacid-2,2’-bipyridyl) and [Ru(dcbpy)3]2+ are co-assembled into UiO-66 scaffolds as structural imperfects for CO2 photocatalytic reduction (named as Re-Ru@U). The prepared catalysts are characterized by XRD, Fourier-Transform infrared (FTIR) spectra, X-ray photoelectron spectra (XPS) and N2 adsorption–desorption isotherms. The intact structure of molecular complexes within the matrix are monitored by 1H nuclear magnetic resonance (NMR) spectra through a totally digesting catalyst. The optical properties are studied via absorption and photoluminescence spectra, and the single-electron reduction in Re and Ru complexes is detected by electron paramagnetic resonance (EPR) spectra. An excellent photocatalytic performance is obtained with steady and sustained CO evolution and a turnover number (TON) value of 15 (11 h). The CO activity irradiating by single wavelength presents the absorption-intensity-dependent changing tendency, where the absorption intensity is superposed by Re and Ru complexes. The two radicals related to Re and Ru, respectively, are simultaneously detected in the Re-Ru@U catalyst. It is suggested that the ReC2 component serves as both a photosensitizer and a catalyst, and the RuC2 component works as an additional photosensitizer to supply the second electron for CO2 reduction. The co-assembling of dual metals Re and Ru in the matrix promotes the electron transfer from the reductive Ru centres to one-electron-reduced Re centres and accounts for the superior activity of CO evolution. Our results demonstrate a strategy to develop the multimetallic catalysts via facile assembling into MOF scaffolds to promote photocatalytic performance.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"28 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of High-Energy Milling on Ceria-Zirconia’s Redox Properties 高能研磨对氧化锆陶瓷氧化还原特性的影响

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-14 DOI: 10.3390/catal13121511

Anatoly Bortun, Mila Bortun, Benjamin Brown, Jeremy Madynski

引用次数: 0

Green Synthesis of Mixed ZnO-SnO2 Nanoparticles for Solar-Assisted Degradation of Synthetic Dyes 用于太阳能辅助合成染料降解的 ZnO-SnO2 混合纳米粒子的绿色合成

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-13 DOI: 10.3390/catal13121509

T. S. Algarni, A. M. Al-Mohaimeed, Naaser A. Y. Abduh, Reem Abdulrahman Habab, Saad Mohammed Alqahtani

{"title":"Green Synthesis of Mixed ZnO-SnO2 Nanoparticles for Solar-Assisted Degradation of Synthetic Dyes","authors":"T. S. Algarni, A. M. Al-Mohaimeed, Naaser A. Y. Abduh, Reem Abdulrahman Habab, Saad Mohammed Alqahtani","doi":"10.3390/catal13121509","DOIUrl":"https://doi.org/10.3390/catal13121509","url":null,"abstract":"In this work, ZnO, SnO2, and their mixed ZnO-SnO2(25%) nanoparticles (NPs) were successfully green synthesized in a straightforward manner with a low-cost and environmentally friendly approach using a banana peel extract. The synthesized nanophotocatalysts were characterized using various techniques including FTIR, XRD, UV-Vis, TEM, SEM, BET, PL, EDS, and TGA. The characterization results showed that the ZnO and SnO2 powders were crystallized in a hexagonal wurtzite and rutile-type tetragonal structures, respectively, and their mixed ZnO-SnO2(25%) NPs contain both structures. Also, it was found that the addition of SnO2 into the ZnO structure reduces the PL intensity of the latter, confirming better separation of electron/hole pairs. The average particle size of a ZnO-SnO2(25%) NP photocatalyst was found to be 7.23 nm. The cationic dyes methylene blue (MB) and crystal violet (CV) as well as the anionic dyes naphthol blue black (NBB) and Coomassie brilliant blue R 250 (CBB) were employed as model dyes to assess the dye removal efficiencies of the biosynthesized nanophotocatalysts under sunlight. In all cases, the mixed ZnO-SnO2(25%) NP photocatalyst showed much better photocatalytic activity than individual photocatalysts. The degradation percent of dyes using ZnO-SnO2(25%) NPs ranged between 92.2% and 98%. The efficient photocatalytic activity of ZnO-SnO2(25%) NPs is attributed to the effective charge separation and reduced electron/hole recombination rate. The kinetic study results conformed to a pseudo first-order reaction rationalized in terms of the Langmuir–Hinshelwood model. Furthermore, the results showed that the ZnO-SnO2(25%) NP photocatalyst is highly stable and could be recycled several times without a noticeable reduction in its catalytic activity towards dye removal.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"3 8‐9","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139004991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sodium Promoted FeZn@SiO2-C Catalysts for Sustainable Production of Low Olefins by CO2 Hydrogenation 钠促进的 FeZn@SiO2-C 催化剂通过二氧化碳加氢实现低烯烃的可持续生产

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-12 DOI: 10.3390/catal13121508

Zhijiang Ni, Mingxing Cai, Shiyu Zhong, Xiaoyu Chen, Hanyu Shen, Lin Su

{"title":"Sodium Promoted FeZn@SiO2-C Catalysts for Sustainable Production of Low Olefins by CO2 Hydrogenation","authors":"Zhijiang Ni, Mingxing Cai, Shiyu Zhong, Xiaoyu Chen, Hanyu Shen, Lin Su","doi":"10.3390/catal13121508","DOIUrl":"https://doi.org/10.3390/catal13121508","url":null,"abstract":"A prepared FeZnNa@SiO2-C catalyst with graphitized carbon (C)-modified mesoporous SiO2 supports metal nanoparticles with the sol–gel method. The effect of adding metal Na and Zn promoters as a dispersion on the CO2 hydrogenation to low olefins was systematically studied. The results showed that Zn–Na, as a combination, could promote the absorption of CO2 and improved the conversion rate of CO2. Na as an alkaline substance can improve the absorption of more acidic CO2, which could increase the conversion rate of CO2 to 59.03%. Meanwhile, the addition of secondary metal Zn to Fe-based catalysts to form a surface alloy could alter the adsorption of CO2 and the activation of C-O bonds, inhibit the subsequent hydrogenation of olefins to paraffins, and facilitate the reduction of Fe2O3 and the formation of active Fe5C2 species. The formation of active Fe5C2 species was found in TEM and XRD, and the selectivity of the target product was 41.07%. The deep hydrogenation of olefins was inhibited, and the space–time yield (STY) of low olefins was raised again by inhibiting their deep hydrogenations, up to 0.0436. However, the corresponding STY did not increase infinitely with the increase of Na doping, and higher catalytic performance for CO2 hydrogenation could be exhibited when the Na doping reached 6.4%. Compared with Fe@SiO2-C catalyst, Na- and Zn-promoted Fe-based catalysts, prepared by the modified sol-gel method, can be used directly for highly efficient CO2 hydrogenation to low olefins and thus has a more promising application prospect in the future.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"56 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Role of Alcohols in the Hexene-1 Hydroalkoxycarbonylation Reaction with Catalysts Based on Palladium Complexes 钯络合物催化剂在己烯-1 氢烷氧羰基化反应中的作用

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-12 DOI: 10.3390/catal13121507

G.J. Zhaksylykova, K. Shalmagambetov, F. Kanapiyeva, N. Kudaibergenov, M. Bulybayev, Meruyert Zykai, G. Abyzbekova, Gulzhan Balykbayeva

引用次数: 0

Carbon Monoxide and Propylene Catalytic Oxidation Activity of Noble Metals (M = Pt, Pd, Ag, and Au) Loaded on the Surface of Ce0.875Zr0.125O2 (110) 负载在 Ce0.875Zr0.125O2 (110) 表面的贵金属（M = Pt、Pd、Ag 和 Au）的一氧化碳和丙烯催化氧化活性

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-11 DOI: 10.3390/catal13121505

Chenxi Zhang, X. Cao, Lili Guo, Zhihao Fang, Di Feng, Xiaomin Sun

{"title":"Carbon Monoxide and Propylene Catalytic Oxidation Activity of Noble Metals (M = Pt, Pd, Ag, and Au) Loaded on the Surface of Ce0.875Zr0.125O2 (110)","authors":"Chenxi Zhang, X. Cao, Lili Guo, Zhihao Fang, Di Feng, Xiaomin Sun","doi":"10.3390/catal13121505","DOIUrl":"https://doi.org/10.3390/catal13121505","url":null,"abstract":"With the advances in engine technology, the exhaust gas temperature of automobiles has further reduced, which in turn leads to an increase in the emissions of carbon monoxide (CO) and hydrocarbons (HCs). In order to understand the influence of CeO2-based catalysts loaded with different noble metals on the catalytic oxidation activity of CO and HCs, this study constructed catalyst models of Ce0.875Zr0.125O2 (100) surfaces loaded with Pt, Pd, Ag, and Au. The electronic density and state density structures of the catalysts were analyzed, and the reaction energy barriers for CO oxidation and C3H6 dehydrogenation oxidation on the catalyst surfaces were also calculated. Furthermore, the activity sequences of the catalysts were explored. The results revealed that after loading Pt, Pd, Ag, and Au atoms onto the catalyst surfaces, these noble metal atoms exhibited strong interactions with the catalyst surfaces, and electron transfer occurred between the noble metal atoms and the catalyst surfaces. Loading with noble metals can enhance the catalytic activity of CO oxidation, but it has little effect on the dehydrogenation oxidation of C3H6. Of the different noble metals, loading with Pd exhibits the best catalytic activity for both CO and C3H6 oxidation. This study elucidated the influence of noble metal doping on the catalytic activity of catalysts at the molecular level, providing theoretical guidance for the design of a new generation of green and efficient catalysts.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"17 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photocatalytic Efficacy and Degradation Kinetics of Chitosan-Loaded Ce-TiO2 Nanocomposite towards for Rhodamine B Dye 壳聚糖负载型 Ce-TiO2 纳米复合材料对罗丹明 B 染料的光催化效率和降解动力学研究

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-11 DOI: 10.3390/catal13121506

Anish Clastin Indira, Jayarajan Muthaian, M. Pandi, Faruq Mohammad, H. Al-Lohedan, A. A. Soleiman

{"title":"Photocatalytic Efficacy and Degradation Kinetics of Chitosan-Loaded Ce-TiO2 Nanocomposite towards for Rhodamine B Dye","authors":"Anish Clastin Indira, Jayarajan Muthaian, M. Pandi, Faruq Mohammad, H. Al-Lohedan, A. A. Soleiman","doi":"10.3390/catal13121506","DOIUrl":"https://doi.org/10.3390/catal13121506","url":null,"abstract":"The recent advancement in the production of nanomaterials with novel architectures and functionality has allowed for the effective treatment of industrial wastewaters and contaminated soil and, in that view, the current study aimed to investigate the catalytic efficacy of biopolymer-loaded titanium nanocomposite. Therefore, Cerium (Ce)-titanium dioxide (TiO2) loaded chitosan nanocomposite was formed and studied its catalytic efficacy towards the degradation of an industrial dye pollutant. For the production of Ce-TiO2/chitosan nanocomposite, we followed the hydrothermal synthesis route and the formed nanocomposite was thoroughly analyzed for the crystallinity (using powdered X-ray diffraction, XRD), surface bonding, and nature (using Fourier transform infrared, FTIR spectroscopy), morphology (scanning electron microscopy, SEM), elemental composition (electron diffraction analysis by X-rays, EDAX), porosity (Brunauer–Emmett–Teller, BET), and particles size in powdered form (transmission electron microscopy, TEM). Then the efficiency of synthesized nanocomposite was tested towards the photocatalytic degradation of Rhodamine B (Rh B) dye by applying various parameters such as the irradiation time, solution pH, catalyst dosage, and the dye concentration. Further, the Langmuir–Hinshelwood model was employed to investigate the kinetics of RhB degradation and provided a conceivable photocatalytic mechanism. It was indicated based on the catalyst mechanism that the modification of TiO2 nanoparticles with Ce and loading onto chitosan biopolymer may have accelerated the photocurrent transport due to an increase in the number of electrons and holes generated by the photon’s irradiation. In this way, the study has witnessed the excellent photocatalytic performance of Ce-TiO2/chitosan with 95% Rh B degradation as against the pure TiO2 nanoparticles thus stressing the importance of developing novel composite photocatalysts.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"35 3","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138979818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visible-Light-Driven BiOBr-TiO2-Attapulgite Photocatalyst with Excellent Photocatalytic Activity for Multiple Xanthates 可见光驱动的 BiOBr-TiO2-Attapulgite 光催化剂对多种黄原酸盐具有优异的光催化活性

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-10 DOI: 10.3390/catal13121504

Yao-zhong Qi, Sikai Zhao, Xiaoyu Jiang, Zhangke Kang, Shuling Gao, Wengang Liu, Yan-bai Shen

{"title":"Visible-Light-Driven BiOBr-TiO2-Attapulgite Photocatalyst with Excellent Photocatalytic Activity for Multiple Xanthates","authors":"Yao-zhong Qi, Sikai Zhao, Xiaoyu Jiang, Zhangke Kang, Shuling Gao, Wengang Liu, Yan-bai Shen","doi":"10.3390/catal13121504","DOIUrl":"https://doi.org/10.3390/catal13121504","url":null,"abstract":"The novel ternary composites BiOBr-TiO2-attapulgite (BTA) were synthesized using a simple hydrothermal and water-bath method, exhibiting excellent photocatalytic performance to multiple xanthates. For the BTA photocatalyst, TiO2 and BiOBr were uniformly loaded onto the surface of acid-activated attapulgite. As a widely used collector in mining processes, sodium ethyl-xanthate (SEX) was selected as the target pollutant due to its high toxicity. The BTA ternary photocatalyst demonstrated significantly higher adsorption and photocatalytic degradation performance compared to TiO2 nanoparticles, BiOBr nanosheets, and BiOBr-TiO2 heterojunction. Structural characterization and experimental results indicated that the exceptional photocatalytic degradation efficiency of BTA was mainly attributed to the formation of a heterojunction between BiOBr and TiO2, as well as the presence of additional active adsorption sites provided by attapulgite. Free radical scavenging experiments and EPR results confirmed that the photogenerated holes were the predominant active species in photodegrading SEX throughout the entire experiment. The LC-MS results provided insight into potential degradation pathways of SEX. This research demonstrates that BTA, as a novel triple composite material, achieves rapid and complete degradation to 20 mg/L SEX within 20 min. This work presents a novel approach to synthesize mineral-based photocatalysts, which have broad prospects for application in flotation wastewater treatment.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"540 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138982840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Immobilization of β-Galactosidase on Glass Fiber Rolls 将 β-半乳糖苷酶固定在玻璃纤维辊上

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-09 DOI: 10.3390/catal13121503

D. Pečar, Katja Zečević, A. Goršek

引用次数: 0

Visible-Light-Driven α-C(sp3)–H Bond Functionalization of Glycine Derivatives 可见光驱动的甘氨酸衍生物 α-C(sp3)-H 键官能化

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-08 DOI: 10.3390/catal13121502

Yao Tian, Xiubin Bu, Yuanrui Chen, Luohe Wang, Junnan E, Jing Zeng, Hao Xu, Aihong Han, Xiaobo Yang, Zhen Zhao

引用次数: 0