Frontiers of Chemical Science and Engineering
>> 2015,
Volume 9,
Issue 4
doi:
10.1007/s11705-015-1547-x
RESEARCH ARTICLE
Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene
Department of Chemistry, Texas A&M University-Commerce, Commerce, TX 75429-3011, USA
Accepted: 2015-11-20
Available online: 2015-11-26
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Abstract
Galvanic replacement, co-impregnation and sequential impregnation have been employed to prepare Pd-Cu bimetallic catalysts with less than 1 wt-% Cu and ca. 0.03 wt-% Pd for selective hydrogenation of acetylene in excess ethylene. High angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) and H chemisorption results confirmed that Pd-Cu single-atom alloy structures were constructed in all three bimetallic catalysts. Catalytic tests indicated that when the conversion of acetylene was above 99%, the selectivity of ethylene of these three single atom alloy catalysts was still more than 73%. Furthermore, the single atom alloy catalyst prepared by sequential incipient wetness impregnation was found to have the best stability among the three procedures used.
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