Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene
Xinxiang Cao , Arash Mirjalili , James Wheeler , Wentao Xie , Ben W.-L. Jang
Front. Chem. Sci. Eng. ›› 2015, Vol. 9 ›› Issue (4) : 442 -449.
Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene
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 H2 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.
palladium-copper bimetallic catalyst / single atom alloy / acetylene hydrogenation / HAADF-STEM / H2 pulse chemisorption
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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