Abstract
Pt/WO(3)-ZrO(2) catalysts were prepared under different conditions to optimize the preparative variables for active and selective catalyst in heptane isomerization. The variables examined were (1) pre-drying temperature of hydrous ZrO(2), (2) way of impregnation, (3) pH of impregnating solution of ammonium metatungstate, (4) WO(3) loading, (5) calcination temperature, (6) calcination atmosphere, and (7) Pt source. In addition to well-known strong effects of (4) and (5), all the variables affected to some extent the activity and selectivity for heptane isomerization. In particular, type of Pt source exerted substantial influence on the activity of the resulting catalyst, H(4)PtCl(6) performing better than Pt(NH(3))(4)Cl(2). (C) 2010 Elsevier B.V. All rights reserved.