Effect of various g-C3N4 precursors on the catalytic performance of alkylorganotin-based catalysts in acetylene hydrochlorination

Authors : Yıbo Wu, Fuxıang Li, Jıanweı Xue, Zhıpıng Lv

Pages : 393-408

Doi:10.3906/kim-1909-64

View : 17 | Download : 8

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :A series of alkylorganotin-based catalysts Sn-g-C$_{3}$N$_{4}$/AC was prepared by wet impregnation in ethanol using different g-C$_{3}$N$_{4}$ precursors and alkylorganotin compounds. The structure, texture, surface composition, and adsorption properties of the as-prepared catalysts were extensively characterized. Then, the obtained samples were evaluated for their catalytic performance in hydrochlorination of acetylene. The results provided by the X-ray photoelectron spectroscopy, acetylene temperature-programmed desorption, and HCl adsorption confirmed the nature of the active sites i.e. Sn-N$_{x}$ involved in the reactant adsorption, and hence in the improved catalytic performance. These active sites were also related to the improved lifetime of alkylorganotin-based catalysts in the hydrochlorination of acetylene. At a constant reaction temperature of 200 °C with an acetylene gas hourly space velocity C2H2-GHSV of 30 h$^{-1}$, Sn-g$_{1}$ -C$_{3}$N$_{4}$/AC-550 exhibited the highest acetylene conversion ~98.0% and selectivity toward the vinyl chloride monomer >98.0% . From the catalytic test results, it was reasonably concluded that the hexamethylenetetramine is the most suitable N precursor, as compared to the dicyandiamide and urea, to prepare high-performance catalysts. From the BET specific surface area of fresh and used catalysts, it was suggested that, in contrast to dicyandiamide and urea, hexamethylenetetramine could delay the deposition of coke on alkylorganotin-based catalysts, which is reflected by the extended lifetime.
Keywords : Alkylorganotin-based catalysts, g-C$_{3}$N$_{4}$, vinyl chloride, acetylene hydrochlorination