A preparation method of a gold catalyst, a gold catalyst and application thereof
By employing a pretreatment method involving freeze-vacuum drying and activation with a mixed gas of hydrogen and hydrogen chloride, the problems of activity and stability of gold catalysts caused by traditional high-temperature drying were solved, resulting in the preparation of small-sized, well-dispersed gold catalysts that improved the performance of the acetylene hydrochlorination reaction.
CN117101716BActive Publication Date: 2026-07-03TIANJIN BOHUA CHEM DEV CO LTD
2 Cites 0 Cited by
Patent Information
- Application Number
- CN202311320006.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-12
- Publication Date
- 2026-07-03
- Estimated Expiration
- 2043-10-12
AI Technical Summary
Technical Problem
Traditional high-temperature drying methods result in poor activity and stability of gold catalysts in the acetylene hydrochlorination reaction, and gold particles are easily reduced and aggregated, affecting the performance of the catalyst.
Method used
A pretreatment method involving freeze-drying and activation with a mixed gas of hydrogen and hydrogen chloride was adopted to avoid the movement and aggregation of gold particles under high temperature conditions, thus preparing a small-sized gold catalyst with good dispersion.
Benefits of technology
This improved the activity and stability of the gold catalyst in the acetylene hydrochlorination reaction and reduced the catalyst deactivation rate.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention discloses a pretreatment method for preparing a gold catalyst, the gold catalyst itself, and its applications, belonging to the field of catalyst preparation and application technology. The invention firstly involves preparing a catalyst impregnation solution with gold as the active component and titanium-silicon molecular sieves as the carrier through impregnation. Then, a two-stage freeze-vacuum drying process is used to remove moisture from the catalyst impregnation solution, preventing the migration, reduction, aggregation, and growth of gold species on the catalyst surface under high-temperature air drying conditions. Secondly, a mixture of hydrogen and hydrogen chloride is used to activate the catalyst. Hydrogen primarily serves to transfer heat and inhibit the aggregation and growth of gold particles, while hydrogen chloride primarily activates the gold to its oxidized state. Compared to catalysts obtained through traditional high-temperature drying pretreatment, the catalyst prepared by combining freeze-vacuum drying and two-component gas activation exhibits smaller gold particle sizes and superior activity and stability in the acetylene hydrochlorination reaction to synthesize vinyl chloride.
Need to check novelty before this filing date? Find Prior Art