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Site Titration with Organic Bases During Catalysis: Selectivity Modifier and Structural Probe in Methanol Oxidation on Keggin Clusters
Author(s) -
Liu Haichao,
Bayat Nader,
Iglesia Enrique
Publication year - 2003
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200352393
Subject(s) - dimethoxymethane , titration , chemistry , catalysis , selectivity , pyridine , methanol , inorganic chemistry , redox , dispersion (optics) , keggin structure , organic base , organic chemistry , physics , optics
The selective and permanent titration of protons with organic bases (2,6‐di‐ tert ‐butylpyridine or pyridine) provides an accurate measure of the dispersion of Keggin structures during catalytic oxidation of methanol. Titration allows the systematic control of the redox and acid properties of H 3+ n PV n Mo 12− n O 40 ( n =0–4) Keggin clusters and leads to unprecedented selectivity in the formation of dimethoxymethane (>80 %) and high yields.