Phosphorus-31 NMR spin lattice relaxation times as an indirect probe of adsorbed water in supported aqueous phase catalysts

Q4 Chemical Engineering

分子催化 Pub Date : 1994-11-27 DOI:10.1016/S0304-5102(94)87037-3

Barbara B. Bunn, Tamas Bartik , Berit Bartik , William R. Bebout, Thomas E. Glass, Brian E. Hanson

引用次数: 11

Abstract

Phosphorus-31 spin lattice relaxation times, T₁'s, for SAP hydroformylation catalysts derived from HRh (CO) (TPPTS)₃ and TPPTS (TPPTS = trisulfonated triphenyl phosphine trisodium salt) are consistent with a liquid-like character for the supported aqueous phase. Ale T₁ for solid TPPTS is 1150 s while for TPPTS in a supported aqueous phase T₁ varies from 220 to 4.9 s. A T₁ of 4.9 s is close to the value obtained for TPPTS in solution and is observed at a H₂O/P ratio of 24.9. At this level of water content previously reported SAP catalysts have shown maximum catalytic activity for the hydroformylation of olefins.

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磷-31核磁共振自旋晶格弛豫时间作为负载型水相催化剂中吸附水的间接探针

由HRh (CO) (TPPTS)3和TPPTS (TPPTS =三磺化三苯基膦三钠盐)衍生的SAP氢甲酰化催化剂的磷-31自旋晶格弛豫时间T1's与负载水相的类液体性质一致。固相TPPTS的Ale T1为1150 s，而负载水相TPPTS的Ale T1为220 ~ 4.9 s。4.9 s的T1接近溶液中TPPTS的值，并且在H2O/P为24.9时观察到。在这个水含量水平上，先前报道的SAP催化剂对烯烃的氢甲酰化表现出最大的催化活性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

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.