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Silica‐Grafted Sn IV Catalysts in Hydrogen‐Transfer Reactions
Author(s) -
Conrad Sabrina,
Verel René,
Hammond Ceri,
Wolf Patrick,
Göltl Florian,
Hermans Ive
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500630
Subject(s) - catalysis , calcination , lewis acids and bases , cyclohexanone , chemistry , adsorption , zeolite , silylation , inorganic chemistry , chemical engineering , organic chemistry , engineering
Abstract Sn IV ‐substituted zeolites show remarkable activity for important Lewis acid catalyzed reactions. In such complex catalytic systems it is, however, difficult to untangle the influence of all parameters contributing to the overall performance, and hence to rationally improve the catalyst. In this work, we studied silica‐grafted Sn IV sites to reduce this complexity by eliminating the potential influence of pore confinement. The surface‐anchored Sn IV sites were modified by calcination and silylation to increase Lewis acidity and hydrophobicity. Various techniques were used to characterize the materials, including the adsorption of cyclohexanone by using FTIR spectroscopy. We relate our spectroscopic results with catalytic tests and compare our model catalysts with benchmark Snβ zeolite. This suggested that besides active‐site structure, also hydrophobicity and confinement effects influence the activity. Our work demonstrates the utility of model systems to separate the different contributions to catalytic activity.