Preparation method and application of nitrogen and sulfur doped modified carbon carrier

The invention provides a preparation method and application of a nitrogen-sulfur doped modified carbon carrier, and the preparation method comprises the following steps: (1) dissolving a certain amount of thiourea in deionized water, and fully mixing to obtain a solution A; (2) adding a certain amount of the solution A prepared in the step (1) into a formaldehyde solution to obtain a mixed solution B; (3) taking a certain amount of the mixed solution B obtained in the step (2), adjusting the pH value to 2-6, filtering, washing and drying to obtain thiourea resin powder; and (4) adding the thiourea resin powder and the coconut shell charcoal carrier into deionized water according to a certain proportion, stirring, drying and calcining to obtain a thiourea resin modified charcoal carrier, which is marked as N-S/C. When the N-S/C carrier is used for preparing a copper-based vinyl chloride synthesis catalyst, the catalyst prepared by the N-S/C carrier has higher acetylene conversion rate and vinyl chloride select