Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 33, 2011
Previous Article Next Article

Acid properties of solid acid catalysts characterized by solid-state 31P NMR of adsorbed phosphorous probe molecules

Author affiliations

Abstract

A brief review is presented on acidity characterization of solid acid catalysts by means of solid-state phosphor-31 magic-angle-spinning nuclear magnetic resonance (31P MAS NMR) spectroscopy using phosphor-containing molecules as probes. It is emphasized that such a simple approach using 31P MAS NMR of adsorbed phosphorous probe molecules, namely trimethylphosphine (TMP) and trialkylphosphine oxides (R3PO), represents a unique technique in providing detailed qualitative and quantitative features, viz. type, strength, distribution, and concentration of acid sites in solid acid catalysts. In particular, it will be shown that when applied with a proper choice of probe molecules with varied sizes and results obtained from elemental analysis, the amounts and locations (intracrystalline vs. extracrystalline) of different types (Brønsted vs. Lewis) of acid sites may be determined. In addition, by incorporating the NMR results with that obtained from theoretical density functional theory (DFT) calculations, correlations between the 31P chemical shifts (δ31P) and acidic strengths of Brønsted and Lewis acid sites may also be derived, facilitating a suitable acidity scale for solid acid catalysts.

Graphical abstract: Acid properties of solid acid catalysts characterized by solid-state 31P NMR of adsorbed phosphorous probe molecules

Back to tab navigation

Publication details

The article was received on 17 Feb 2011, accepted on 31 May 2011 and first published on 25 Jul 2011


Article type: Perspective
DOI: 10.1039/C1CP20417C
Phys. Chem. Chem. Phys., 2011,13, 14889-14901

  •   Request permissions

    Acid properties of solid acid catalysts characterized by solid-state 31P NMR of adsorbed phosphorous probe molecules

    A. Zheng, S. Huang, S. Liu and F. Deng, Phys. Chem. Chem. Phys., 2011, 13, 14889
    DOI: 10.1039/C1CP20417C

Search articles by author

Spotlight

Advertisements