Catalyst for pyrolysis of 1,2-dichloroethane (DCE) to prepare vinyl chloride (VC) and preparation method, use, and regeneration method thereof

A method for a catalytic pyrolysis of 1,2-DCE to prepare VCM, comprising:

• introducing a 1,2-DCE-containing feed gas into a reactor filled with a catalyst, and allowing the 1,2-DCE-containing feed gas to contact the catalyst and be subjected to a reaction to obtain the VCM;
• wherein the catalyst comprises a silicon-aluminum molecular sieve;
• the silicon-aluminum molecular sieve has a silicon-aluminum ratio of 2 to 9.2, the silicon-aluminum ratio is based on a molar ratio of SiO2 to Al2O3, and the catalyst has a VCM selectivity of equal to or higher than 98%;
• the silicon-aluminum molecular sieve comprises at least one selected from the group consisting of an X-type silicon-aluminum molecular sieve, a Y-type silicon-aluminum molecular sieve, a USY-type silicon-aluminum molecular sieve, an MOR-type silicon-aluminum molecular sieve, and a Beta-type silicon-aluminum molecular sieve.