TITLE:
Methanol Steam Reforming over Na-Doped ZnO-Al2O3 Catalysts
AUTHORS:
Di Liu, Yong Men, Jinguo Wang, Xin Liu, Qiuyan Sun
KEYWORDS:
Methanol Steam Reforming, Hydrogen Production, ZnO-Al2O3 Catalyst, Na-Promotion, Activity
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.7 No.7,
July
20,
2016
ABSTRACT: In this study, the
catalyst composition in binary ZnO-Al2O3 catalyst was
initially evaluated and optimized for methanol steam reforming. Then different
Na contents were loaded by an incipient wetness impregnation method onto the
optimized ZnAl catalyst. It was found that the activity was greatly enhanced by
the modification of Na, which depended on the Na content in the catalyst. The
methanol conversion was 96% on a 0.1 Na/0.4 ZnAl catalyst (GHSV = 14,040 h-1, S/C = 1.4,
350°C), which was much higher with respect to a Na-free 0.4 ZnAl catalyst
(74%). The remarkable improvement of activity was attributed to a weakening of
the C-H bonds and clear of hydroxyl group by the Na dopant leading to an
accelerated dehydrogenation of the reaction intermediates formed on ZnAl2O4 spinel surface and thus the overall reaction.