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Abstract
Ambient-condition acetylene hydrogenation to ethylene (AC-AHE) is a promising process for ethylene production with minimal additional energy input, yet remains a great challenge due to the difficulty in the coactivation of acetylene and H2 at room temperature. Herein, we report a highly efficient AC-AHE process over robust sulfur-confined atomic Pd species on tungsten sulfide surface. The catalyst exhibits over 99% acetylene conversion with a high ethylene selectivity of 70% at 25 °C, and a record space-time yield of ethylene of 1123 molC2H4 molPd−1 h−1 under ambient conditions, which is nearly four times that of the typical Pd1Ag3/Al2O3 catalyst, and exhibiting superior stability of over 500 h. We demonstrate that the confinement of Pd-S coordination induces positively-charged atomic Pdδ+, which not only facilitates C2H2 hydrogenation but also promotes C2H4 desorption, thereby enabling a high conversion of C2H2 to C2H4 at room temperature while suppressing over-hydrogenation to C2H6.
Publisher
Nature Communications
Published On
Nov 01, 2024
Authors
Wangwang Zhang, Kelechi Uwakwe, Jingting Hu, Yan Wei, Juntong Zhu, Wu Zhou, Chao Ma, Liang Yu, Rui Huang, Dehui Deng
Tags
acetylene hydrogenation
ethylene production
catalyst efficiency
room temperature reaction
sulfur-confined atomic Pd
high selectivity
catalytic performance
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