Investigation on Catalytic Cracking Performance of Metal Catalysts for 1,1,2‐TCE

In order to investigate the differences in the dehydrochlorination performance of cesium chloride, cesium fluoride, and cesium bromide for 1,1,2-TCE, TG-DTG, BET, FTIR, SEM and TEM-EDS characterizations have been used to analyze the catalysts. According to DFT calculations, the activation energy of the reaction is the lowest when cesium chloride is used as a catalyst.

Abstract

PVDC played an irreplaceable role in the field of sealed packaging, and its polymer monomer, VDC, was in short supply. At present, the saponification of 1,1,2-TCE and sodium hydroxide was used to generate VDC in industry, which was a process with great environmental pollution. Catalytic dehydrochlorination of 1,1,2-TCE to produce VDC was a green process route, but the selection of catalysts had always been controversial. This study aimed to screen catalysts suitable for industrial applications. The cesium based catalysts with good catalytic performance were systematically characterized and evaluated, and the overall reaction process was calculated using DFT calculation. The experimental results indicated that the cesium chloride catalyst with a 3 % molar fraction had the best catalytic performance, achieving 55.27 % conversion of 1,1,2-TCE and 76.85 % selectivity for VDC, respectively. The reaction paths and transition state of several catalysts were calculated by DFT method. It was revealed that the activation energy required for the reaction of CsCl catalyst was the lowest, at 130.61 kcal/mol, and the energy of the product VDC was the lowest, at −63.25 kcal/mol, making it the most stable. The calculation results were consistent with the experimental data, indicating that cesium chloride catalyst had the best reaction performance. Therefore, the subsequent research could focus on the method of improving the supported dispersity of cesium chloride catalyst and the development of core-shell catalyst to lay the foundation for further industrialization.

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