Acetylene hydrochlorination over tin nitrogen based catalysts: effect of nitrogen carbon-dots as nitrogen precursor

Yibo Wu; Fuxiang Li; Qingbin Li; Songtian Li; Ganqing Zhao; Xuerong Sun; Peisong Liu; Guoxv He; Yongjun Han; Liping Cheng; Shiying Luo

doi:10.3906/kim-2102-67

Acetylene hydrochlorination over tin nitrogen based catalysts: effect of nitrogen carbon-dots as nitrogen precursor

Turk J Chem. 2021 Oct 19;45(5):1463-1475. doi: 10.3906/kim-2102-67. eCollection 2021.

Authors

Yibo Wu^{1

2}, Fuxiang Li², Qingbin Li¹, Songtian Li¹, Ganqing Zhao¹, Xuerong Sun¹, Peisong Liu¹, Guoxv He¹, Yongjun Han¹, Liping Cheng¹, Shiying Luo¹

Affiliations

¹ College of Chemistry and Enviromental Engineering, Pingding Shan University, Pingding Shan China.
² College of Chemistry and Chemical Engineering, Taiyuan University of technology, Taiyuan China.

Abstract

The catalysts comprising the main active compounds of Sn-Nx were synthesized using trichlorophenylstannane ((C₆H₅)Cl₃Sn), nitrogen carbon-dots (NCDs), and activated carbon (AC) as starting materials, and the activity and stability of catalysts was evaluated in the acetylene hydrochlorination. According to the results on the physical and chemical properties of catalysts (TEM, XRD, BET, XPS and TG), it is concluded that NCDs@AC can increase (C₆H₅)Cl₃Sn dispersity, retard the coke deposition of (C₆H₅)Cl₃Sn/AC and lessen the loss of (C₆H₅)Cl₃Sn, thereby further promoting the stability of (C₆H₅)Cl₃Sn/AC. Based on the characterization results of C₂H₂-TPD and HCl adsorption experiments, we proposed that the existence of Sn-N_x can effectively strengthen the reactants adsorption of catalysts. By combing the FT-IR, C₂H₂-TPD and Rideal-Eley mechanism, the catalytic mechanism, in which C₂H₂ is firstly adsorbed on (C₆H₅)Cl₃Sn to form (C₆H₅)Cl₃Sn-C₂H₂ and then reacted with HCl to produce vinyl chloride, is proposed.

Keywords: Trichlorophenylstannane; acetylene hydrochlorination; nitrogen carbon-dots; vinyl chloride.