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Acetylene hydrochlorination over tin nitrogen based catalysts: Effect of nitrogen carbondots as nitrogen precursor

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The catalysts comprising the main active compounds of Sn-Nx were synthesized using trichlorophenylstannane ((C6 H5 )Cl3 Sn), 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 (C6 H5 )Cl3 Sn dispersity, retard the coke deposition of (C6 H5 )Cl3 Sn/AC and lessen the loss of (C6 H5 )Cl3 Sn, thereby further promoting the stability of (C6 H5 )Cl3 Sn/AC. Based on the characterization results of C2 H2 - TPD and HCl adsorption experiments, we proposed that the existence of Sn-Nx can effectively strengthen the reactants adsorption of catalysts. |