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Tin-sulfur based catalysts for acetylene hydrochlorination
Yibo Wu1,2, Fuxiang Li2, Xiaoqiang Luo1
1College of Chemistry and Environmental Engineering, Pingding Shan University, Pingding Shan China.
Tin-sulfur catalysts show high stability in acetylene hydrochlorination. The (CH3SO3)2Sn/S@AC catalyst maintained over 90% acetylene conversion for 50 hours, demonstrating enhanced performance and longevity.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Acetylene hydrochlorination is a key industrial process.
- Developing stable and efficient catalysts is crucial for industrial applications.
- Tin-based catalysts are explored for various chemical transformations.
Purpose of the Study:
- To prepare and evaluate tin-sulfur based catalysts for acetylene hydrochlorination.
- To investigate the role of tin-sulfur interaction in catalyst performance.
- To understand the mechanism of coke deposition and catalyst deactivation.
Main Methods:
- Synthesis of tin-sulfur catalysts using Na2SO3 and (CH3SO3)2Sn.
- Acetylene hydrochlorination reaction testing under specific conditions (200°C, VHCl/VC2H2 = 1.1:1.0, C2H2-GSHV = 15 h⁻¹).
- Characterization using X-ray photoelectron spectroscopy (XPS), HCl adsorption, acetylene temperature programmed desorption (C2H2-TPD), and nitrogen adsorption/desorption.
Main Results:
- The (CH3SO3)2Sn/S@AC catalyst achieved over 90% acetylene conversion after 50 hours of reaction.
- Tin-sulfur interaction was found to retard Sn2+ oxidation and enhance reactant adsorption.
- The CH3SO3- group effectively reduced coke deposition, prolonging catalyst lifetime.
Conclusions:
- Tin-sulfur catalysts, particularly (CH3SO3)2Sn/S@AC, exhibit excellent stability and activity in acetylene hydrochlorination.
- The synergistic effect between tin and sulfur is key to the catalyst's improved performance and resistance to deactivation.
- The CH3SO3- moiety plays a vital role in mitigating coke formation, leading to extended catalyst durability.
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