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Effect of Composition and Pretreatment Parameters on Activity and Stability of Cu-Al Catalysts for Water-Gas Shift Reaction.
- Source :
- ChemCatChem; Jun2014, Vol. 6 Issue 6, p1698-1706, 9p
- Publication Year :
- 2014
-
Abstract
- We investigated various Cu species responsible for highly efficient Cu-Al oxide catalyst for the water-gas shift reaction (WGSR). The formation of various Cu species was achieved by systematically varying the Cu-Al composition in the coprecipitated mixed Cu-Al oxides. The Cu-Al composition of 70:30 (Cu-Al-7) was the best for WGSR using the reformate gas composition. In addition, the Cu-Al-7 catalyst reduced under 100 % H<subscript>2</subscript>, was relatively stable with time on stream of 100 h, at higher gas hourly space velocity of 36 201 h<superscript>−1</superscript>.The structural investigation of our coprecipitated catalysts with varying Cu-Al compositions revealed the formation of nonzero oxidation state copper and metallic Cu to be essential for the observed WGSR activity. In addition, the highest activity and stability of Cu-Al-7 catalysts reduced under 100 % H<subscript>2</subscript> at lower temperature was attributed to particle-size stabilization and a lower extent of Cu aggregation by Cu<subscript>2</subscript>O and boehmite phases, respectively, along with the formation of various Cu species during the activation protocol for 12 h. Complete CO<subscript>2</subscript> selectivity without methanation was observed for all the Cu-Al compositions irrespective of their pretreatment conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- WATER-gas
CATALYSTS
OXIDATION
CATALYTIC activity
METHANATION
BOEHMITE
Subjects
Details
- Language :
- English
- ISSN :
- 18673880
- Volume :
- 6
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- ChemCatChem
- Publication Type :
- Academic Journal
- Accession number :
- 96362790
- Full Text :
- https://doi.org/10.1002/cctc.201301049