Nuclear spin relaxation as a probe of zeolite acidity: a combined NMR and TPD investigation of pyridine in HZSM-5

被引：31

作者：

Robinson, Neil ^{[1
]}

Brauer, Pierre ^{[2
]}

York, Andrew P. E. ^{[3
]}

D'Agostino, Carmine ^{[4
]}

机构：

[1] Univ Western Australia, Dept Chem Engn, 35 Stirling Highway, Perth, WA 6009, Australia

[2] Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England

[3] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

[4] Univ Manchester, Dept Chem Engn & Analyt Sci, Sackville St, Manchester M13 9PL, Lancs, England

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2021年 / 23卷 / 33期

基金：

英国工程与自然科学研究理事会;

关键词：

TEMPERATURE-PROGRAMMED DESORPTION; MAGNETIC-RESONANCE; SURFACE INTERACTIONS; GLYCEROL OXIDATION; LEWIS ACIDITY; AL CONTENT; SITES; ADSORPTION; DIFFUSION; DYNAMICS;

D O I：

10.1039/d1cp01515j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The relative surface affinities of pyridine within microporous HZSM-5 zeolites are explored using two-dimensional H-1 nuclear magnetic resonance (NMR) relaxation time measurements. The dimensionless ratio of longitudinal-to-transverse nuclear spin relaxation times T-1/T-2 is shown to exhibit strong sensitivity to the silica/alumina ratio (SAR) of these zeolites, which is indicative of material acidity. This trend is interpreted in terms of increased pyridine surface affinity with decreasing SAR. Temperature programmed desorption (TPD) analysis corroborates this observation, revealing a distinct increase in the heat of desorption associated with adsorbed pyridine as a function of decreasing SAR. A direct correlation between NMR and TPD data suggests NMR relaxation time analysis can be a valuable tool for the non-invasive characterisation of adsorption phenomena in microporous solids.

引用

页码：17752 / 17760

页数：10

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