Reaction Kinetics, Mechanisms and Catalysis最新文献_第5页

Effects of ytterbium on potassium titanate for enhanced photocatalytic degradation of Acid red 1

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-24 DOI: 10.1007/s11144-024-02750-7

Shuai Zhang, Wenjie Zhang, Zhao Lv

{"title":"Effects of ytterbium on potassium titanate for enhanced photocatalytic degradation of Acid red 1","authors":"Shuai Zhang, Wenjie Zhang, Zhao Lv","doi":"10.1007/s11144-024-02750-7","DOIUrl":"10.1007/s11144-024-02750-7","url":null,"abstract":"<div>A sol–gel method was used to prepare Ybn-K2Ti6O13 to show ytterbium’s effects on potassium titanate’s properties. The crystallite sizes of monoclinic K2Ti6O13 phase for K2Ti6O13, Yb0.15-K2Ti6O13 and Yb0.3-K2Ti6O13 were calculated to be 25.5, 44.9 and 41.1 nm. The specific surface area and pore volume of K2Ti6O13 were small, and Yb0.15-K2Ti6O13 had the largest specific surface area (9.10 m2/g) and pore volume (0.0193 cm3/g). The photoluminescence intensity reduced in the sequence: K2Ti6O13, Yb0.3-K2Ti6O13 and Yb0.15-K2Ti6O13. The photocatalytic activities of Ybn-K2Ti6O13 were much better than that of K2Ti6O13, and the degradation efficiencies in 80 min for Yb0.15-K2Ti6O13, Yb0.3-K2Ti6O13 and K2Ti6O13 were determined to be 89.6%, 69.9% and 56.3%. The 600 mg/L dosage of Yb0.15-K2Ti6O13 was suitable for the photocatalytic reaction.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 2","pages":"1055 - 1066"},"PeriodicalIF":1.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716958","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}

引用次数: 0

In−depth insights into the kinetic and thermodynamic parameters of synergistic coffee residue pyrolysis of sugar industry sludge and biochar characterization

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-23 DOI: 10.1007/s11144-024-02740-9

Tongxi Mo, Hairong Mo, Yuanjie Wu, Haitao Liang, Hongming Xiong, Linlin Wang

{"title":"In−depth insights into the kinetic and thermodynamic parameters of synergistic coffee residue pyrolysis of sugar industry sludge and biochar characterization","authors":"Tongxi Mo, Hairong Mo, Yuanjie Wu, Haitao Liang, Hongming Xiong, Linlin Wang","doi":"10.1007/s11144-024-02740-9","DOIUrl":"10.1007/s11144-024-02740-9","url":null,"abstract":"<div>This study elucidated the thermal behavior, biochar, kinetics and thermodynamics parameters of sugar industry sludge (SS), coffee residue (CR) and their mixtures (SC31: mass ratio of 3:1 and SC21: mass ratio of 2:1) using high‐precision thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy, combined with advanced non−isothermal conversion methods. The ultimate analysis reveals that the feedstocks contain high carbon content and low levels of nitrogen and sulfur, underscoring their potential as sources for producing clean carbon resources. The TGA result indicates that (co-)pyrolysis proceed via a three−stage process, encompassing moisture removal, devolatilization, and char formation. The kinetic results demonstrated that the non−isothermal conversion methods have good agreement on kinetic parameters, the average Ea of sugar industry sludge, coffee residue, CS31 and SC21 were 241.18, 207.35, 247.89 and 218.36 kJ/mol, respectively. At a mass ratio of sugar industry sludge to coffee residue at 2:1, the experimental Ea dips below its theorized value. SS and CR (co-)pyrolysis follows the Avrami−Erofeev (SC31) and power−law (SC21) mechanisms. The thermodynamic results indicate that co−pyrolysis exhibits higher reactivity. FTIR findings revealed that SS and CR had similar functional groups and that the co−pyrolysis chars not only incorporated ketones, aldehydes and acids, but also H2O and CO2. SEM images underscore the potential of co−pyrolyzed biochar as a significant feedstock for fabricating porous nanosheet biochar.<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":"143 - 162"},"PeriodicalIF":1.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404253","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}

引用次数: 0

Kinetic adsorption studies of methylene blue and crystal violet dyes removal in single and competitive systems using lemon peels/activated carbon/alginate composite

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-23 DOI: 10.1007/s11144-024-02736-5

Amina Aichour, Hakim Djafer Khodja, Hassina Zaghouane-Boudiaf, Cesar Viseras Iborra, Manuel Sanchez Polo

{"title":"Kinetic adsorption studies of methylene blue and crystal violet dyes removal in single and competitive systems using lemon peels/activated carbon/alginate composite","authors":"Amina Aichour, Hakim Djafer Khodja, Hassina Zaghouane-Boudiaf, Cesar Viseras Iborra, Manuel Sanchez Polo","doi":"10.1007/s11144-024-02736-5","DOIUrl":"10.1007/s11144-024-02736-5","url":null,"abstract":"<div>Efficient hybrid multifunctional composite was elaborated in order to eliminate cationic dyes (methylene blue and crystal violet). Lemon peels-biomass-Derived and activated carbon were encapsulated with calcium alginate in order to obtain the hybrid composite. Several analyses were used to characterize the composite such as Elementary analysis, FTIR, PXRD, SEM, BET, and pHPZC. Adsorption studies were investigated according to different operational conditions. High adsorption stability via pH was observed from 5 to 11. MB adsorption process was found to be spontaneous and exothermic nature, proven by the negative value of ΔH° and ΔG°. Isotherm study revealed that the experimental adsorbed Methylene blue amount on the composite reached 1130.97 mg/g. Langmuir, Freundlich, and Toth models were applied to analyze isotherm adsorption. Langmuir and Toth models show the highest correlation coefficients R2 > 0.985 and R2 > 0.994 respectively. Binary equilibrium study showed that the presence of CV reduces MB removal indicating the competitiveness between the two cationic dyes. Reusability study of composite was investigated through six cycles of adsorption–desorption. Adsorption performance was decreased with increase on cycle’s numbers. Prepared new hybrid composite is considered as highly recyclable and efficient adsorbent for organic dyes, it contributes to reduce more the process cost.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"303 - 322"},"PeriodicalIF":1.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404252","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}

引用次数: 0

Reactivity and philicity of phthalimide-N-oxyl and benzotriazol-N-oxyl radicals in addition reactions to vinyl compounds

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-23 DOI: 10.1007/s11144-024-02738-3

I. O. Opeida, O. V. Kushch, M. O. Kompanets, I. O. Hordieieva, A. N. Shendrik

{"title":"Reactivity and philicity of phthalimide-N-oxyl and benzotriazol-N-oxyl radicals in addition reactions to vinyl compounds","authors":"I. O. Opeida, O. V. Kushch, M. O. Kompanets, I. O. Hordieieva, A. N. Shendrik","doi":"10.1007/s11144-024-02738-3","DOIUrl":"10.1007/s11144-024-02738-3","url":null,"abstract":"In this paper, we report the comparative investigation of reactivity of phthalimide-N-oxyl (PINO) and benzotriazole-N-oxyl (BTNO) radicals toward double bonds of vinyl compounds. The rate constants for radical addition (kadd) to alkenes were determined experimentally. It has been shown that kadd for PINO is significantly higher than for BTNO, and the reactivity of olefines increases in the series: CH2 = CHCN < CH2 = CHCOOH < CH2 = CHC(O)OCH3 < CH2 = CHC(O)NH2 < CH2 = C(CH3)C(O)OCH3 < CH2 = CHC6H5 < CH2 = C(CH3)C6H5. The plots of the dependence of the addition rate constants on the ionization potential of vinyl compounds gave a good linear correlation, which indicates the electrophilicity of the radicals and the significant influence of polar effects in the reactions studied. Polar effects operate at the level of the transition state, which is characterized by the transfer of electron from the alkene to the radical and the generation of a negative charge on the oxygen atom. The contribution of the polar factor to the energy of the transition state of reactions is adequately described by the Fukui–Klopman–Salem equation. The calculated indices of global electrophilicity of radicals (ωo) confirm the electrophilic nature of PINO and BTNO, however ωo BTNO (ωo = 4.79 eV) is higher than that of PINO (ωo = 4.00 eV). At the same time, the calculated spin density on the N–O fragment and O atom of the PINO radical is significantly higher than that of BTNO, which may be the reason for the different reactivity and selectivity of the radicals.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"71 - 90"},"PeriodicalIF":1.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404254","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}

引用次数: 0

Catalytic oxidation of phenol with H2O2 over VOx/GaSiAlOx catalyst

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-21 DOI: 10.1007/s11144-024-02747-2

Xiaorui Wang, Yanwei Li, Peng Dong

引用次数: 0

Construction of (001)-TiO2/g-C3N4 heterojunction for enhanced photocatalytic degradation of methylene blue

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-21 DOI: 10.1007/s11144-024-02739-2

Ran Gao, Wensong Lin, Huanxia Lin, Yong He, Xin Mai, Yeheng Zhang

{"title":"Construction of (001)-TiO2/g-C3N4 heterojunction for enhanced photocatalytic degradation of methylene blue","authors":"Ran Gao, Wensong Lin, Huanxia Lin, Yong He, Xin Mai, Yeheng Zhang","doi":"10.1007/s11144-024-02739-2","DOIUrl":"10.1007/s11144-024-02739-2","url":null,"abstract":"<div>The (001)-TiO2 (001 crystal plane-oriented titanium oxide) nanoparticles was precipitated on the surface of as-prepared graphitic carbon nitride (g-C3N4) and the composites with heterogeneous structures were manufactured. Methylene blue (MB) as the target pollutant was used to evaluate the performance of the composite photocatalysts. The decrease of the band gap, suppression of electron–hole recombination and the increased specific surface area of the composites enhance the the photocatalytic degradation performance. The mass ratio of (001)-TiO2 and g-C3N4 in the composites with the best degradation performance for MB was found to be 1:5, which was denoted as TCN2. The rate for MB to be degraded after exposure to light for 60 min was 95% by TCN2. The degradation rate constant k of TCN2 is 0.0442 min−1, which is 7 times that of (001)-TiO2 and 4 times that of g-C3N4. After four rounds of photocatalytic experiments, the photocatalytic efficiency of TCN2 remains at a high level. The composition and microstructure of the materials were characterized by XRD, XPS, FTIR, SEM, TEM, and BET. The optical properties and degradation mechanism of the material were investigated by PL, DRS, PEC, EIS, and active substance capture experiments. The mechanism of MB photocatalytic degradation was proposed.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"455 - 469"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404205","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}

引用次数: 0

Characteristics of integral plasma-fluidized bed and preparation of Mo-based catalysts for sulfur-resistant methanation

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-21 DOI: 10.1007/s11144-024-02735-6

Baowei Wang, Jiangzhou Kong, Xiaoyan Li

引用次数: 0

Reduction kinetics of nickel oxide dispersed on MCM-41

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-18 DOI: 10.1007/s11144-024-02741-8

P. R. Jithesh, Robinson P. Ponminiessary, Aleena Varghese, K. V. Greeshma, Anandaram Sreekanth

引用次数: 0

Sandwich structured Zn–W–Bi–O catalysts with low activation energy for highly effective oxidative desulfurization of oil

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-16 DOI: 10.1007/s11144-024-02745-4

Guangqiang Lin, Chunfeng Mao, Menghua Li, Ziyi Wang, Qinyi Li, Jiaqing Zhan, Junsheng Liu

{"title":"Sandwich structured Zn–W–Bi–O catalysts with low activation energy for highly effective oxidative desulfurization of oil","authors":"Guangqiang Lin, Chunfeng Mao, Menghua Li, Ziyi Wang, Qinyi Li, Jiaqing Zhan, Junsheng Liu","doi":"10.1007/s11144-024-02745-4","DOIUrl":"10.1007/s11144-024-02745-4","url":null,"abstract":"<div>In this study, Zn–W–Bi–O catalysts with a sandwich structure were prepared by mixing zinc tungstate and bismuth nitrate to form bismuth tungstate at the interface. The catalyst was composed of bismuth nitrate as the upper layer, zinc tungstate as the lower layer, and phase interface (bismuth tungstate) as the core. The generation of phase interfaces provides a new reaction mechanism for catalytic processes. Based on the different intermediate state changes in the reaction process, the Zn–W–Bi–O catalysis system can be divided into H-S Mechanism, B-R Mechanism, and P-G Mechanism. These reaction mechanisms will simultaneously react with H2O2 to generate various transition states, which will cooperatively oxidize sulfur atoms to remove them. The structural characteristics and stability of Zn–W–Bi–O catalysts were determined. There are strong stability and catalytic efficiency for Zn–W–Bi–O catalysts. The desulfurization rate can be close to 100% under optimal conditions (Catalyst of 0.02 g, ionic liquids of 0.5 mL, H2O2 of 0.2 mL, model oil of 5 mL, 80 °C). Zn-W-Bi-O-2 catalysts lead to 3 times improvement in ODS activity for the upper layer and 1.25 times improvement in ODS activity for the lower layer. The catalytic reaction mechanism was obtained by the structure-activity relationship.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"251 - 266"},"PeriodicalIF":1.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404251","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}

引用次数: 0

Low-temperature cascade conversion of methane to aromatics via a physically mixed catalyst

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-10-16 DOI: 10.1007/s11144-024-02734-7

Tengfei Lu, Yongjie Wang, Yi Zhang

引用次数: 0