科研之友
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摘要
The existence of trace acetylene in ethylene produced by naphtha cracking could poison the catalyst of ethylene polymerization, resulting in the deterioration of polymer quality. Selective catalytic semi-hydrogenation can effectively remove trace acetylene from ethylene rich flow, and palladium with excellent hydrogen dissociation and carbon-carbon triple bond affinity is recognized as the most efficient and promising catalyst for acetylene semi hydrogenation. The flaw of palladium is its high proneness to transform ethylene to ethane due to its poor selectivity for the former. Hence considerable academic and engineering efforts have been made, on the basis of a lot of modification methods, including adjusting the microstructure and dispersion of palladium catalysts, forming alloys with other metals, introducing catalyst promoters and optimizing supports. In this paper, the latest research progress of different palladium catalysts in semi-hydrogenation of acetylene is reviewed. The effects of the above-mentioned modification methods on the catalytic performance of palladium are summarized, and the future research directions are also prospected. ? 2022 Cailiao Daobaoshe/ Materials Review.
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