Journal of Molecular Catalysis A: Chemical最新文献

{"title":"Preparation of(NiCo)2 P/NF Self-supporting Electrode and Its Electrocatalytic Water Splitting","authors":"王 莎莎","doi":"10.3724/SP.J.7101438852","DOIUrl":"https://doi.org/10.3724/SP.J.7101438852","url":null,"abstract":"","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75677590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Different Linear Diamines on the Performance of Photocatalysts for Hydrogen Production of Sensitized Graphene","authors":"吕 功煊, 王 玉营, 张 旭强, 陈 建彪","doi":"10.3724/SP.J.7101438843","DOIUrl":"https://doi.org/10.3724/SP.J.7101438843","url":null,"abstract":"","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76452830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In Situ Synthesis of Ru Doped Hollow BiOBr Microsphere as an Efficient Photocatalyst for Photocatalytic CO2 Reduction and Organic Pollutant Degradation","authors":"迪 丽努尔·塔力甫, 阿 布力克木·阿布力孜, 张 俊杰, 亚 力昆江·吐尔逊","doi":"10.3724/SP.J.7101438844","DOIUrl":"https://doi.org/10.3724/SP.J.7101438844","url":null,"abstract":"","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77891399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Research of CO Monoxide in Different Atmosphere on Au/Cu/FLA Catalysts at Low Temperature","authors":"孙 立波, 苏 慧娟, 郑 玉华, 祁 彩霞","doi":"10.3724/SP.J.7101438850","DOIUrl":"https://doi.org/10.3724/SP.J.7101438850","url":null,"abstract":"","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80612529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gas-Phase Catalytic Isomerization of Tran-Chlorochloroolefin to Cis-Chlorochloroolefin and Its Potential Mechanism","authors":"吴 明亮","doi":"10.3724/SP.J.7101438846","DOIUrl":"https://doi.org/10.3724/SP.J.7101438846","url":null,"abstract":"","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89087235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mild homogeneous oxidation and hydrocarboxylation of cycloalkanes catalyzed by novel dicopper(II) aminoalcohol-driven cores","authors":"Tiago A. Fernandes,&nbsp;Vânia André,&nbsp;Alexander M. Kirillov,&nbsp;Marina V. Kirillova","doi":"10.1016/j.molcata.2016.07.050","DOIUrl":"https://doi.org/10.1016/j.molcata.2016.07.050","url":null,"abstract":"<div><p><em>N</em>-benzylethanolamine (Hbea) and triisopropanolamine (H₃tipa) were applied as unexplored aminoalcohol <em>N</em>,<em>O</em>-building blocks for the self-assembly generation of two novel dicopper(II) compounds, [Cu₂(μ-bea)₂(Hbea)₂](NO₃)₂ (<strong>1</strong>) and [Cu₂(H₃tipa)₂(μ-pma)]·7H₂O (<strong>2</strong>) {H₄pma<!--> <!-->=<!--> <!-->pyromellitic acid}. These were isolated as stable and aqua-soluble microcrystalline products and were fully characterized by IR spectroscopy, ESI–MS(±), and single-crystal X-ray diffraction, the latter revealing distinct Cu₂ cores containing the five-coordinate copper(II) centers with the {CuN₂O₃} or {CuNO₄} environments. Compounds <strong>1</strong> and <strong>2</strong> were used as homogeneous catalysts for the mild oxidation of C₅–C₈ cycloalkanes to give the corresponding cyclic alcohols and ketones in up to 23% overall yields based on cycloalkane. The reactions proceed in aqueous acetonitrile medium at 50<!--> <!-->°C using H₂O₂ as an oxidant. The effects of different reaction conditions were studied, including the type and loading of catalyst, amount and kind of acid promoter, and water concentration. Despite the fact that different acids (HNO₃, H₂SO₄, HCl, or CF₃COOH) promote the oxidation of alkanes, the reaction is exceptionally fast in the presence of a catalytic amount of HCl, resulting in the TOF values of up to 430<!--> <!-->h⁻¹. Although water typically strongly inhibits alkane oxidations due to the reduction of H₂O₂ concentration and lowering of the alkane solubility, in the systems comprising <strong>1</strong> and <strong>2</strong> we observed a significant growth (up to 5-fold) of an initial reaction rate in the cyclohexane oxidation on increasing the amount of H₂O in the reaction mixture. The bond-, regio- and stereo-selectivity parameters were investigated in oxidation of different linear, branched, and cyclic alkane substrates. Both compounds <strong>1</strong> and <strong>2</strong> also catalyze the hydrocarboxylation of C₅–C₈ cycloalkanes, by CO, K₂S₂O₈, and H₂O in a water/acetonitrile medium at 60<!--> <!-->°C, to give the corresponding cycloalkanecarboxylic acids in up to 38% yields based on cycloalkanes.</p></div>","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.molcata.2016.07.050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2220022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epoxy monomers obtained from castor oil using a toxicity-free catalytic system","authors":"Natalia L. Parada Hernandez ,&nbsp;Anderson J. Bonon ,&nbsp;Juliana O. Bahú ,&nbsp;Maria Ingrid R. Barbosa ,&nbsp;Maria Regina Wolf Maciel ,&nbsp;Rubens Maciel Filho","doi":"10.1016/j.molcata.2016.08.005","DOIUrl":"https://doi.org/10.1016/j.molcata.2016.08.005","url":null,"abstract":"<div><p>In order to obtain monomers from vegetable source, the castor oil epoxidation process was investigated. The catalytic system used in this work, H₂O₂/alumina/ethyl acetate, can be considered as a green system, free of heavy metals and toxic solvents. These characteristics make the system appropriate for the purpose of this study since they increase the probabilities of obtaining a biomaterial with the desired specifications regarding toxicity. Reaction conditions of castor oil epoxidation were optimized using methyl ricinoleate as a model compound. In order to identify the operating region, it was developed an experimental design 2³ with 17 assays (6 axial points and central point in triplicate) in which, methyl ricinoleate, hydrogen peroxide and catalyst initial quantities in the reaction mixture were the studied variables. The system showed great efficiency with 100% of selectivity in the methyl ricinoleate epoxide production. In optimized conditions, it showed conversion of 99% in 6<!--> <!-->h. It was obtained a conversion of 94%, an epoxidation percentage of 84 and a selectivity of 89% toward the epoxides for the castor oil epoxidation. These results show the efficacy of the catalytic system used in this work. Epoxidized castor oil structure was confirmed by FTIR, Raman and ¹H NMR techniques.</p></div>","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.molcata.2016.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2660118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionic liquids/ZnO nanoparticles as recyclable catalyst for polycarbonate depolymerization","authors":"Francesco Iannone ,&nbsp;Michele Casiello ,&nbsp;Antonio Monopoli ,&nbsp;Pietro Cotugno ,&nbsp;Maria Chiara Sportelli ,&nbsp;Rosaria Anna Picca ,&nbsp;Nicola Cioffi ,&nbsp;Maria M. Dell’Anna ,&nbsp;Angelo Nacci","doi":"10.1016/j.molcata.2016.11.006","DOIUrl":"https://doi.org/10.1016/j.molcata.2016.11.006","url":null,"abstract":"<div><p>A useful protocol for waste bis-phenol A-polycarbonates (BPA-PC) chemical recycling is proposed based on a bifunctional acid/basic catalyst composed by nanostructured zinc oxide and tetrabutylammonium chloride (ZnO-NPs/NBu₄Cl) in quality of Lewis acid and base, respectively. Retro-polymerization reaction proved to be of general application for several nucleophiles, including water, alcohols, amines, polyols, aminols and polyamines, leading to the complete recovery of BPA monomer and enabling the PC polymer to function as a green carbonylating agent (green phosgene alternative) for preparing carbonates, urethanes and ureas. A complete depolymerization can be obtained in seven hours at 100<!--> <!-->°C and ZnO nanocatalyst can be recycled several times without sensible loss of activity. Remarkably, when polycarbonate is reacted with glycerol, it is possible to realize in a single process the conversion of two industrial wastes (BPA-PC and glycerol) into two valuable chemicals like BPA monomer and glycerol carbonate (the latter being a useful industrial solvent and fuel additive).</p></div>","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.molcata.2016.11.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2660121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DFT mechanistic study of reactions of С6H6 and 1,3,5-Ad3C6H3 with CBr3. The first example of hydride transfer from aromatic CH bond to electrophile","authors":"Yurii A. Borisov,&nbsp;Irena S. Akhrem","doi":"10.1016/j.molcata.2016.10.027","DOIUrl":"https://doi.org/10.1016/j.molcata.2016.10.027","url":null,"abstract":"<div><p>The DFT B3LYP/6-31G* calculations were carried out for the reactions of C₆H₆ and Ad₃C₆H₃ (Ad<!--> <!-->=<!--> <!-->1,3,5-adamantyl) with superelectrophile CBr₃⁺ as a model of superelectrophilic catalyst CBr₃⁺ Al₂Br₇⁻. The reaction of C₆H₆ with CBr₃⁺ proceeds <em>via</em> the classical scheme of electrophilic reactions of aromatic C<!--> <!-->−<!--> <!-->H bond to form initially the barrier-free σ-complex C₆H₆CBr₃⁺. This mechanism was confirmed by the aug-cc-pVDZ basis set calculations. The reaction of Ad₃C₆H₃ with CBr₃⁺ occurs <em>via</em> a quite novel mechanism involving aryl cation formation followed by hydride abstraction of the Ar⁺ from the 2-Ad group and the rearrangement of the 2-Ad⁺ cation into the 4-phenyl-4-protoadamantyl cation. The hydride transfer from both arenes was shown to be more favorable than H radical transfer by more than 40 and 55<!--> <!-->kcal<!--> <!-->mol⁻¹ in the case of C₆H₆ and Ad₃C₆H₃, respectively.</p></div>","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.molcata.2016.10.027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2798707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rhodium-BiPhePhos catalyzed hydroformylation studied by operando FTIR spectroscopy: Catalyst activation and rate determining step","authors":"Andreas Jörke ,&nbsp;Andreas Seidel-Morgenstern ,&nbsp;Christof Hamel","doi":"10.1016/j.molcata.2016.10.028","DOIUrl":"https://doi.org/10.1016/j.molcata.2016.10.028","url":null,"abstract":"<div><p>The homogeneously rhodium catalyzed hydroformylation of 1-decene was studied using operando FTIR spectroscopy. The bulky chelating diphosphite ligand BiPhePhos was used for catalyst modification. Special emphasis was given to the transformation of the Rh-precursor Rh(acac)(CO)₂ to the activated HRh(BiPhePhos)(CO)₂ catalyst. Under hydroformylation conditions, this complex was found to be the most abundant catalyst species over a wide range of olefin conversion. Other inactive or non-selective rhodium species were not detectable. Analysis of the turnover frequency revealed a first order dependence of the hydroformylation rate with respect to the concentration of 1-decene. These findings indicate that the coordination of the olefin to the Rh-BiPhePhos catalyst is determining the hydroformylation rate of 1-decene.</p></div>","PeriodicalId":370,"journal":{"name":"Journal of Molecular Catalysis A: Chemical","volume":null,"pages":null},"PeriodicalIF":5.062,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.molcata.2016.10.028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"2595834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}