N-pentane isomerization over platinum-promoted W/Zr mixed oxides supported on mesoporous silica
Resource
Applied Catalysis A: General 261, 211–219
Journal
Applied Catalysis A: General 261, 211–219
Pages
-
Date Issued
2004
Date
2004
Author(s)
DOI
246246/2006111501232938
Abstract
W/Zr mixed oxides supported on various porous silica materials, namely SBA-15, MCM-41 & silica gel, were prepared. Their acidities & catalytic activities in n-pentane isomerization were examined. For the mesoporous silica, SBA-15 was found to retain the ordered meso-structure better than MCM-41 after loading with W/Zr mixed oxide. TEM photographs showed that tungstated zirconia was dispersed inside the mesoporous channels of SBA-15, & that the surface area & pore volume decreased with the loading. The SBA-15 supported WO3/ZrO2 materials promoted with Pt were highly catalytic efficient in n-pentane isomerization with a very high iso-pentane selectivity. In contrast, MCM-41 & silica gel supported WO3/ZrO2 showed lower catalytic activities. The optimal activity was observed on SBA-15 with 1%Pt/20%WO3/40%ZrO2. The mesoporous silica supports played an important role in stabilizing the mixed oxide catalyst since the catalytic activity decayed less markedly with time-on-stream on the supported catalysts.
Subjects
Tungstated zirconia
Mixed oxide
Catalyst
Acid
Mesoporous silica
MCM-41
SBA-15
Isomerization of n-pentane
Platinum
Publisher
Taipei:National Taiwan University Coll Management
Type
journal article
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