Promising SiC support for Pd catalyst in selective hydrogenation of acetylene to ethylene

Promising SiC support for Pd catalyst in selective hydrogenation of acetylene to ethylene
Title:
Promising SiC support for Pd catalyst in selective hydrogenation of acetylene to ethylene
Other Titles:
Applied Surface Science
Publication Date:
15 February 2018
Citation:
Guo, Z. L.; Liu, Y. F.; Liu, Y.; Chu, W., Promising SiC support for Pd catalyst in selective hydrogenation of acetylene to ethylene. Applied Surface Science 2018, 442, 736-741.
Abstract:
In this study, SiC supported Pd nanoparticles were found to be an efficient catalyst in acetylene selective hydrogenation reaction. The ethylene selectivity can be about 20% higher than that on Pd/TiO2 catalyst at the same acetylene conversion at 90%. Moreover, Pd/SiC catalyst showed a stable catalytic life at 65 °C with 80% ethylene selectivity. With the detailed characterization using temperature-programmed reduction (H2-TPR), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 adsorption/desorption analysis, CO-chemisorption and thermo-gravimetric analysis (TGA), it was found that SiC owns a lower surface area (22.9 m2/g) and a broad distribution of meso-/macro-porosity (from 5 to 65 nm), which enhanced the mass transfer during the chemical process at high reaction rate and decreased the residence time of ethylene on catalyst surface. Importantly, SiC support has the high thermal conductivity, which favored the rapid temperature homogenization through the catalyst bed and inhabited the over-hydrogenation of acetylene. The surface electronic density of Pd on Pd/SiC catalyst was higher than that on Pd/TiO2, which could promote desorption of ethylene from surface of the catalyst. TGA results confirmed a much less coke deposition on Pd/SiC catalyst.
License type:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Funding Info:
This work was funded by the Chinese scholarship council (CSC) - Ph.D. scholarship for Guo Zhanglong, the Institute of Chemical and Engineering Sciences (ICES, Singapore) and the National Natural Science Foundation of China (21476145).
Description:
ISSN:
0169-4332
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