, processes for the preparation and use thereof
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United States of America Patent
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Jun 18, 2013
Grant Date -
Jul 7, 2011
app pub date -
May 30, 2008
filing date -
May 31, 2007
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Abstract
A shell catalyst for the preparation of vinyl acetate monomer, comprising an oxidic porous catalyst support with an outer shell, containing metallic Pd and Au, wherein the framework structure of the porous catalyst support contains hafnium oxide units. This shell catalyst is suitable for the preparation of VAM and is characterized by a relatively high activity and VAM selectivity and maintains this activity and selectivity over relatively long service lives. Also, processes for the preparation and use of the shell catalyst.
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