Article ID Journal Published Year Pages File Type
56277 Catalysis Today 2010 7 Pages PDF
Abstract

A new simple characterization method was employed to investigate the formation of carbon deposits in reduced Co/Y zeolites. The method was based on temperature programmed surface reaction (TPSR) between adsorbed carbon deposits and hydrogen. Together with other characterization methods of FMR, TEM and H2 chemisorption, CO hydrogenation reaction was performed on Co/Y zeolite catalysts, and the changes in CO hydrogenation activity and selectivity with metal distributions were also investigated. Especially the studies have discussions about the selectivity pattern of cobalt clusters within Y-zeolite cages and large cobalt metal aggregates on the external surface of the zeolites.The catalyst having most of cobalt metal clusters inside the zeolite cages showed much more selective synthesis of C3 and C4 products than the other catalysts. It is suggested that the lower hydrogenating ability induced the enhanced chain propagation and the chain growth was terminated by the surface sites of cobalt clusters.

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
Authors
, , , , , , , ,