Enhancement of Acetylene Hydrogenation Activity Over Ni–Zn Bimetallic Catalyst by Doping with Au
A series of modified Ni–Zn bimetallic catalysts were prepared by depositing different kinds of 4 wt% metals (Ir, Pt, Au, Cu, Ag) on the Ni–Zn–Al hydrotalcite (NZAH) and tested in the selective hydrogenation of acetylene. The activity was enhanced by 3-fold over the
4 wt% Au/NZAH, meanwhile, the yield of C2H4 was also increased more than 4 times compared with the NZAH. Characterization by means of H2-TPR, XRD, SEM, and TEM revealed that Au was highly dispersed on the catalyst, and the ternary Au-Ni–Zn alloy was formed
during the H2 reduction at 500 °C. Doping Au in Ni–Zn bimetallic catalyst weakens the adsorption of acetylene and also hinders the coke deposition on the catalyst, which leads to the enhanced activity in acetylene hydrogenation.
Document Type: Research Article
Publication date: 01 September 2014
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