1. Role of a Doped Support Strategy for Maintaining Stable Cun+Sites in Acetylene Hydrochlorination
- Author
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Yang, Lijie, Li, Linfeng, Li, Jian, Xu, Yongsheng, Dong, Yanzhao, Xie, Dongyang, Liu, Zhenbang, Zhang, Qiangang, Qi, Ji, Guo, Zihan, Zhang, Jinli, and Zhang, Haiyang
- Abstract
A Cu-based catalyst, a developable catalyst in the acetylene hydrochlorination reaction, suffers from severe insufficient activity due to the reduction of Cun+sites under a C2H2atmosphere. In this work, we have developed a doped support strategy to maintain more than 90% of Cun+sites during the reaction via simply treating the mixture of melamine pyrophosphate and pristine activated carbon. Doped engineering for support plays dual positive roles in the acetylene hydrochlorination reaction: due to the interaction between Cu and doped sites, reduced C2H2molecules are easily desorbed at lower temperatures on the Cu sites to inhibit the reduction from Cun+to Cu0during the reaction. Besides, element-doped sites also provide more adsorption sites for reactant molecules to decrease the internal diffusion distance. Based on the above benefits, the optimal catalyst (Cu/N,P1/2-AC) achieved an initial C2H2conversion of 97.8%, and the activity loss of the catalyst was only 14.2% in the long-term stability test at 200 h. Finally, this strategy is extended by other two doped precursors with obvious catalytic performance enhancement. This designed strategy for Cu-based catalysts provides a new appreciation for the acetylene hydrochlorination reaction.
- Published
- 2024
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