The study of Pd-based acetylene hydrochlorination catalyst modified by nitrogen-containing ligand

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Abstract To improve the stability of Pd-based acetylene hydrochloride catalyst, a novel Pd-based catalyst modified with nitrogen ligand was prepared by simple wet impregnation method. The activity of the catalyst with the dosage of 10% nitrogen ligand reaches 99% and only decreases 5% after 20 h under the conditions of 170 ℃, GHSV (C₂H₂)=720 h^-1, and V(HCl)/V(C₂H₂)=1.2. The results of TEM show that the Pd species is highly dispersed. XPS results prove that nitrogen ligands can reduce the reduction of high palladium species during the reaction. Furthermore, the data of the TG, ICP-OES, and BET certify that the nitrogen ligand significantly reduces the carbon deposition and inhibits the loss of Pd species. Besides, the theoretical calculations show that the ligand enhances the adsorption and activation of HCl, and reduces the energy difference in the process of electron transfer from Pd to HCl, which effectively promotes the reaction of hydrochlorination of acetylene.

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	WANG Xingtao
	WANG Fumin
	ZHANG Xubin

Keywords： acetylene hydrochlorination Pd-based catalyst nitrogen ligand carbon deposition

Received 2023-02-16;

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WANG Xingtao, WANG Fumin, ZHANG Xubin.The study of Pd-based acetylene hydrochlorination catalyst modified by nitrogen-containing ligand[J] Chemcial Industry and Engineering, 2023,V40(6): 59-69

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