Reaction Kinetics, Mechanisms and Catalysis最新文献

{"title":"Enhanced photo-decomposition of methylene blue and toluene with (Ag,Na)-TiO2/Sr4All4O25:Eu,Dy heterojunction photocatalyst synthesized by coprecipitation method","authors":"Hyun-sung Kang,&nbsp;Bumrae Cho,&nbsp;Jung-Sik Kim","doi":"10.1007/s11144-024-02783-y","DOIUrl":"10.1007/s11144-024-02783-y","url":null,"abstract":"<div><p>The TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ heterojunction photocatalyst has been prepared by TiO₂ nanoparticles coated on the Sr₄Al₁₄O₂₅:Eu,Dy phosphor substrate using a coprecipitation reaction method. To improve the generation of charge carriers in the photocatalyst, Na and Ag elements were impregnated on TiO₂ nanoparticles by adding NaHCO₃ and AgNO₃, respectively. The (Ag,Na)-impregnated TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ hybrid photocatalyst system was synthesized under various conditions, including different Ag concentrations (0–0.08 M) and heat treatment temperatures (200–500 °C). The photocatalytic performance of (Ag,Na)-impregnated TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ hybrid photocatalysts was analyzed through the photobleaching of methylene blue(MB) dye solution and decomposition of toluene gas. In the hybrid photocatalysts of TiO₂-coated long-lasting phosphors, the phosphor may act as an internal light source toward the acceleration or sustenance of photocatalytic reactivity even in the absence of external light irradiation. The photocatalytic reactivity of (Ag,Na)-TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ hybrid photocatalyst surpassed that of Na-TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ without Ag impregnation. The (0.06 M Ag, Na)-TiO₂/Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ photocatalyst and TiO₂/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ without Ag impregnation degraded a 10 ppm toluene gas about 65% and 30% in 150 min under visible light, respectively. This superior performance can be primarily ascribed to the synergistic interaction between (Ag,Na) and TiO₂.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"657 - 671"},"PeriodicalIF":1.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic treatment of oilfield wastewater using TiO2/MoS2 nanocomposites prepared via sol–gel and hydrothermal methods","authors":"Jianing He,&nbsp;Zhiyong Hu,&nbsp;Xinqi Zhu,&nbsp;Zhihua Liu","doi":"10.1007/s11144-024-02779-8","DOIUrl":"10.1007/s11144-024-02779-8","url":null,"abstract":"<div><p>In this study, TiO₂, MoS₂ and TiO₂/MoS₂ nanomaterials were successfully synthesized by sol–gel method and hydrothermal method using butyl titanate and ammonium molybdate as precursors. In the experiment of photocatalytic degradation of oilfield wastewater, the effects of catalyst dosage, initial pH value, reaction time and other key factors on the photocatalytic activity were systematically investigated. The results show that under the conditions that the capacity of wastewater treatment reaction system is 200 mL, the dosage of TiO₂ and TiO₂/MoS₂ are both 0.8 g, the initial pH value is between 3 and 4, and the reaction time is 40 min, the removal rates of oil and suspended matter in oilfield wastewater by TiO₂/MoS₂ can reach 79.4% and 92.7%. This significant improvement is likely due to the synergistic effect of TiO₂/MoS₂ composites, where the presence of MoS₂ helps to improve light absorption and electron transport efficiency, thereby enhancing photocatalytic performance. The detailed mechanisms in this regard will be further elaborated in subsequent discussions. The innovation of this study lies in the successful synthesis of TiO₂/MoS₂ composites, and the systematic exploration of its high efficiency and influencing factors in the photocatalytic treatment of oilfield wastewater.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"1153 - 1174"},"PeriodicalIF":1.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of sulfate ions on adsorption properties of nano-zirconia: a crucial factor in the defluoridation of tap water","authors":"Nesrine Kamoun,&nbsp;Sahar Raissi,&nbsp;Mohamed Kadri Younes,&nbsp;Hamza Elfil","doi":"10.1007/s11144-024-02785-w","DOIUrl":"10.1007/s11144-024-02785-w","url":null,"abstract":"<div><p>In the present investigation, we study the effect of the calcination temperature on the stability of sulfate ions in nano-sulfated zirconia, which play an important role in water defluoridation. Nano-sulfated zirconia adsorbents were developed for fluoride uptake from water. It showed excellent efficiency for Tunisian tap water treatment. This performance is due to the particular synthesis process using sol–gel approach in one- pot coupled to supercritical drying. The morphology and structure of the prepared materials were examined using N₂ physisorption, FTIR spectroscopy, SEM, pH_PZC, XRD, TEM and EDX spectroscopy. Textural properties revealed that all prepared nanoscale materials develop a mesoporous texture, a high porosity, and a large surface area, reaching 340 m² g⁻¹. FTIR spectroscopy and SEM analysis showed the formation of highly functionalized solids with various active sites and numerous cavities. TEM results confirmed the nanocrystalline nature of our solids. The different findings indicated that the functionalization of zirconia produces a particular material’s structure affected by calcination temperature. In the broad pH range of 2–8, the selected nano-sulfated zirconia exhibited a high fluoride removal rate of almost 99% in a shorter equilibrium time of 5 min. Investigations were conducted into the economic value, reusability, and regeneration potential.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"323 - 346"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Limonene oxide isomerization: a broad study of acid catalyst effects","authors":"Anna Rejzková,&nbsp;Eliška Vyskočilová","doi":"10.1007/s11144-024-02774-z","DOIUrl":"10.1007/s11144-024-02774-z","url":null,"abstract":"<div><p>In this work, a broad screening of possible catalysts for limonene oxide isomerization was performed. The catalysts included both Brønsted and Lewis acids as homogeneous or heterogeneous catalysts. The aim was to show the efficiency of different catalysts in the studied reaction and use one homogeneous (methanesulfonic acid) and two heterogeneous (zeolite beta-25, montmorillonite K10) catalysts to evaluate the influence of the acid site type on the selectivity. When the selected catalysts were used, almost total conversion up to 1 h was observed (2?50% of the catalyst was based on type, 80 °C, and 16.6 V% of the solution was limonene oxide in toluene). The strength of the acid/acid catalyst influenced the composition of the products. When a strong acid (methanesulfonic acid) was used, the products formed by dehydration (<i>p</i>-cymene) and isomerization of the double bond (carvenone) were detected in large amounts. Using the majority of catalysts, the main products were <i>cis</i>- and <i>trans</i>-dihydrocarvone, and the minor products were carveols and carvone. The water content of the acid catalyst strongly affected the selectivity. Limonene diol was formed as a hydration product, which decreased the selectivity for the desired products. We have described a wide spectrum of possible catalysts for limonene isomerization. Moreover, our study enables the simple choice of catalyst on the basis of the desired composition of the products.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"47 - 69"},"PeriodicalIF":1.7,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11144-024-02774-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"N-doped carbon dots/MnO2 composite for the efficient catalytic reduction of malachite green and methyl violet","authors":"M. Shanti,&nbsp;S. Shylaja,&nbsp;Gaddameedi Hima Bindu,&nbsp;Mohammed Areef","doi":"10.1007/s11144-024-02767-y","DOIUrl":"10.1007/s11144-024-02767-y","url":null,"abstract":"<div><p>Here in, N-doped carbon dots/MnO₂ (NCDs/MnO₂) composite was synthesized via a facile one-pot method, utilizing the reducing properties of NCDs to convert KMnO₄ into MnO₂. Characterization techniques, including XPS, TEM, FTIR, and XRD, confirmed the successful formation of the composite. The catalytic performance of the NCDs/MnO₂ composite was evaluated for the reduction of malachite green (MG) and methyl violet (MV) dyes in the presence of NaBH₄. The composite exhibited excellent catalytic activity with over 96.0% MV reduction in 14 min and 96.5% MG was reduced in 12 min. Kinetic studies revealed pseudo-first-order reaction kinetics, with rate constants of 0.2087 ± 0.0113 min⁻¹ for MV and 0.1288 ± 0.0083 min⁻¹ for MG. Moreover, the composite demonstrated excellent reusability, maintaining high catalytic efficiency over multiple cycles. These findings highlight the potential of the NCDs/MnO₂ composite as a promising and sustainable catalyst for the treatment of dye-contaminated wastewater, contributing to environmental remediation efforts.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"347 - 359"},"PeriodicalIF":1.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observation of an order change during the course of a reaction in a kinetic study of the reduction of trans-dicyanodibromoaurate(III) by octacyanotungstate(IV) in an acidic medium","authors":"Jannie C. Swarts,&nbsp;C. Robert Dennis","doi":"10.1007/s11144-024-02743-6","DOIUrl":"10.1007/s11144-024-02743-6","url":null,"abstract":"<div><p>The reduction of dibromodicyanoaurate(III) ion by octacyanotungstate(IV) ions was studied under near stoichiometric conditions in an acidic medium. An order change occurred during the course of the reaction. The reaction was first order in Au(CN)₂(Br)₂^– and second order in W(CN)₈^4– for the first half-life, but after ca. 60% conversion became first order in both reactants. The order change is ascribed to two different Au^II intermediates that form during the reaction course. A third order rate constant of k₃ = 7.80 × 10⁵ M⁻² min⁻¹ and a second order rate constant of k₂ = 108 M⁻¹ min⁻¹ was found at [H⁺] = 1.633 × 10^–3 M, an ionic strength of I = 0.11 M (NaBr) and at 25.0 ± 0.1 °C for the reaction. The reaction rate decreases with increasing [H⁺] in the reaction mixture at low pH and an experimental pK_a of 1.80 ± 0.03 was found at 25.0 ± 0.1 °C for the deprotonation of HW(CN)₈^3–. The reaction rate is independent of [Br⁻] and decrease with addition of W(CN)₈^3– in the reaction mixture. Activation parameters have been obtained by a least-squares fit of the temperature data directly to the Eyring equation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"31 - 45"},"PeriodicalIF":1.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11144-024-02743-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Steam-treated SAPO-18 with well-regulated acidity and excellent dimethyl ether to olefin conversion performance","authors":"You Gyong Ho,&nbsp;Song Chol Jong,&nbsp;Un Yong Paek,&nbsp;Songchol Hong","doi":"10.1007/s11144-024-02749-0","DOIUrl":"10.1007/s11144-024-02749-0","url":null,"abstract":"<div><p>The hydrothermally synthesized SAPO-18 catalyst was steam treated to investigate the catalytic performance in dimethyl ether to olefins (DTO) reaction. After steam treatment, micropores and mesopores were created on the SAPO-18 catalyst. To evaluate the catalytic activity of steamed SAPO-18, the DTO reaction was carried out at 673 K with weight hourly space velocity (WHSV) of 3.546 h⁻¹, and the steamed SAPO-18 (S-773) at 773 K exhibited excellent DTO conversion performance (single-run lifetime 5.5 h, light olefin selectivity 95.9%) with BET surface area of 737 m² g⁻¹, mesopore volume of 125 mm³ g⁻¹, total amount of acid sites of 533 µmol g⁻¹, and Brønsted/Lewis ratio of 0.97. The improvement of DTO stability can be attributed to the increased mesoporosity and significantly reduced total amount of acid sites (well- regulated Brønsted/Lewis ratio) after steam treatment of SAPO-18 catalyst.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"817 - 829"},"PeriodicalIF":1.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxidative esterification of 1, 2-propanediol to methyl lactate over Au/CuxAlOy catalysts in methanol without the presence of a base","authors":"Weiguo Fang,&nbsp;Xiaohu Xie,&nbsp;Guixian Li,&nbsp;Yingying Fan,&nbsp;Junying Tian,&nbsp;Dongqiang Zhang","doi":"10.1007/s11144-024-02772-1","DOIUrl":"10.1007/s11144-024-02772-1","url":null,"abstract":"<div><p>A series of Au catalysts supported on different CuAl composite oxide supports were designed for the oxidative esterification of 1,2-propanediol to methyl lactate in an alkali-free methanol system. A conversion of 52.8% and a methyl lactate selectivity of 67.0% were obtained over the optimized Au/Cu_1.5AlO₃ catalyst under the conditions of 140 °C and 1.0 MPa O₂. The Au in the catalyst was revealed to be pivotal, providing the essential active sites necessary for the oxidative esterification of 1,2-propanediol. Moreover, the inclusion of Cu in the CuAl composite oxide support was discovered to markedly enhance the catalytic performance of the Au catalysts. The synergistic interaction between Au and Cu is posited to alter the electronic and geometric properties of the gold sites, thereby enhancing the catalyst's ability to oxidize the primary hydroxyl group of 1,2-propanediol. This strategic modification of the Au sites by Cu is instrumental in improving the selectivity for methyl lactate during the oxidative esterification process.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"947 - 965"},"PeriodicalIF":1.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of Cu-based catalysts for the synthesis of neopentyl glycol from hydroxypivalaldehyde hydrogenation: studies on the role of Zr promoter","authors":"Hui Liu,&nbsp;Wanbang Zhu,&nbsp;Xueyan Zhou,&nbsp;Bing Wei,&nbsp;Liancheng Bing,&nbsp;Dezhi Han,&nbsp;Guangjian Wang,&nbsp;Fang Wang","doi":"10.1007/s11144-024-02768-x","DOIUrl":"10.1007/s11144-024-02768-x","url":null,"abstract":"<div><p>In this work, a series of zirconium-modified ternary copper-based catalysts with various loadings were prepared by co-precipitation method, and the promotional roles of zirconium on the selective hydrogenation of hydroxypivalaldehyde (HPA) was evaluated. Zirconium is commonly used as a promoter in Cu-based hydrogenation catalysts, but its promoting mechanism on HPA hydrogenation to neopentyl glycol (NPG) remains ambiguous. Thus, various characterization techniques (e.g. XRD, SEM, FTIR, H₂-TPR, and XPS) have been used to probe the physicochemical properties of zirconium-modified catalysts. The consequences indicate that the incorporation of zirconium will affect the reducibility of the catalyst and the distribution of surface reduced copper and promote the formation of more oxygen vacancies on the catalyst. The catalyst with 5% zirconium loading showed the best catalytic performance probably due to the good synergistic catalytic effect between the oxygen vacancies and the copper species.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"727 - 741"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Copper doping effects on structural and photocatalytic properties of spinel ferrite nanoparticles for organophosphate pesticide removal","authors":"Muhammad Madni,&nbsp;Kinza Fatima,&nbsp;Maher Ali Rusho,&nbsp;Allah Nawaz Aqeel,&nbsp;Ammara Sattar,&nbsp;Laila Batool,&nbsp;Mahrukh Ali,&nbsp;Muhammad Usman,&nbsp;Muhammad Yasar","doi":"10.1007/s11144-024-02760-5","DOIUrl":"10.1007/s11144-024-02760-5","url":null,"abstract":"<div><p>This study investigates copper-doped cadmium aluminum ferrite (CuxCd_1-xAl_0.2Fe_1.8O₄ (0, 0.2)) photocatalyst nanoparticles were synthesized by Sol–gel method and used for photocatalytic degradation of triazophos. XRD analysis revealed a decrease in crystallite size from 24.29 nm to 20.45 nm upon Cu doping. FTIR spectra showed peak shifts 448–437 cm⁻¹ (octahedral sites) and 520–554 cm⁻¹ (tetrahedral sites), after Cu doping. SEM indicated a more homogeneous microstructure after doping, while EDX confirmed the presence of Cu. BET analysis showed an increase in surface area from 18.45 m²/g to 47.76 m²/g. The Cu₀.₂Cd₀.₈Al₀.₂Fe₁.₈O₄ nanoparticles exhibited 91.21% triazophos degradation within 100 min under 100 W visible irradiation, compared to 63.76% for the undoped counterpart. The bandgap narrowed from 2.8 eV to 2.5 eV upon Cu doping. Scavenger analysis identified hydroxyl radicals as the primary reactive species. Adding H₂O₂ (up to 6 mM) enhanced degradation, but higher concentrations inhibited the process. The catalyst showed good reusability, with efficiency decreasing from 91.21% to 82.38% after five cycles. The enhanced photocatalytic activity was attributed to improved light absorption, charge carrier separation, and increased surface area resulting from Cu doping.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"1131 - 1151"},"PeriodicalIF":1.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}