H. Armendariz , J.A. Toledo , G. Aguilar-Rios , M.A. Valenzuela , P. Salas , A. Cabral , H. Jimenez , I. Schifter
{"title":"锌铬铁氧体催化剂上正丁烷氧化脱氢反应的研究","authors":"H. Armendariz , J.A. Toledo , G. Aguilar-Rios , M.A. Valenzuela , P. Salas , A. Cabral , H. Jimenez , I. Schifter","doi":"10.1016/0304-5102(94)00071-9","DOIUrl":null,"url":null,"abstract":"<div><p>The role of chromium as a promoter of butadiene selectivity in <em>n</em>-butane oxidative dehydrogenation on ZnCr<sub><em>x</em></sub>Fe<sub>2-<em>x</em></sub>O<sub>4</sub> (0<<em>x</em><1.09) catalysts was studied. Catalysts have a spinel structure with Cr<sup>3+</sup> replacing Fe<sup>3+</sup> in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe<sub>2</sub>O<sub>4</sub> structure. Iron nuclei showed the lowest electron density for <em>x</em>=0.5–0.6, hence the electron density of oxygen in FeO bond has to be enhanced. <em>n</em>-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at <em>x</em>=0.5–0.6. These results suggest that chromium increases butadiene and CO<sub>2</sub> selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.</p></div>","PeriodicalId":16567,"journal":{"name":"分子催化","volume":"92 3","pages":"Pages 325-332"},"PeriodicalIF":0.0000,"publicationDate":"1994-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0304-5102(94)00071-9","citationCount":"13","resultStr":"{\"title\":\"Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts\",\"authors\":\"H. Armendariz , J.A. Toledo , G. Aguilar-Rios , M.A. Valenzuela , P. Salas , A. Cabral , H. Jimenez , I. Schifter\",\"doi\":\"10.1016/0304-5102(94)00071-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The role of chromium as a promoter of butadiene selectivity in <em>n</em>-butane oxidative dehydrogenation on ZnCr<sub><em>x</em></sub>Fe<sub>2-<em>x</em></sub>O<sub>4</sub> (0<<em>x</em><1.09) catalysts was studied. Catalysts have a spinel structure with Cr<sup>3+</sup> replacing Fe<sup>3+</sup> in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe<sub>2</sub>O<sub>4</sub> structure. Iron nuclei showed the lowest electron density for <em>x</em>=0.5–0.6, hence the electron density of oxygen in FeO bond has to be enhanced. <em>n</em>-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at <em>x</em>=0.5–0.6. These results suggest that chromium increases butadiene and CO<sub>2</sub> selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.</p></div>\",\"PeriodicalId\":16567,\"journal\":{\"name\":\"分子催化\",\"volume\":\"92 3\",\"pages\":\"Pages 325-332\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1994-09-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0304-5102(94)00071-9\",\"citationCount\":\"13\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"分子催化\",\"FirstCategoryId\":\"1089\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0304510294000719\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"Chemical Engineering\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"分子催化","FirstCategoryId":"1089","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0304510294000719","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Chemical Engineering","Score":null,"Total":0}
Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts
The role of chromium as a promoter of butadiene selectivity in n-butane oxidative dehydrogenation on ZnCrxFe2-xO4 (0<x<1.09) catalysts was studied. Catalysts have a spinel structure with Cr3+ replacing Fe3+ in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe2O4 structure. Iron nuclei showed the lowest electron density for x=0.5–0.6, hence the electron density of oxygen in FeO bond has to be enhanced. n-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at x=0.5–0.6. These results suggest that chromium increases butadiene and CO2 selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.
期刊介绍：
Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes.
The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.
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