Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-07-30 , DOI: 10.1134/s0965544121080107 D. S. Zasukhin 1 , I. A. Kostyukov 1 , I. A. Kasyanov 1 , Yu. G. Kolyagin 1 , I. I. Ivanova 1, 2
Abstract
The review analyzes the potential of 31Р MAS NMR spectroscopy of adsorbed trisubstituted phosphines and phosphine oxides for the investigation of the acidic properties of molecular sieve catalysts. The main methodological approaches to identifying sites of different types are considered. The assignment of signals in the 31Р MAS NMR spectra of methyl-, ethyl-, n-butyl-, and phenyl-substituted phosphines and their oxides adsorbed on zeolites of different structural types and other molecular sieves to Lewis and Brønsted acid sites is reported, and the potential of 31Р MAS NMR spectroscopy as a tool for the determination of the strength of these sites and their amount is analyzed. It is shown that varying the size of the substituent allows assessment of the localization and accessibility of acid sites in zeolites.
中文翻译:
吸附探针分子的 31Р NMR 光谱作为测定分子筛催化剂酸度的工具(综述)
摘要
该综述分析了吸附的三取代膦和氧化膦的31 Р MAS NMR 光谱在研究分子筛催化剂酸性性质方面的潜力。考虑了识别不同类型站点的主要方法论方法。报告了吸附在不同结构类型的沸石和其他分子筛上的甲基、乙基、正丁基和苯基取代的膦及其氧化物的31 Р MAS NMR 光谱中的信号分配给路易斯和布朗斯台德酸位点, 和31的潜力Р MAS NMR 光谱作为确定这些位点强度的工具,并对其数量进行了分析。结果表明,改变取代基的大小可以评估沸石中酸性位点的定位和可及性。