A high-dispersion low-mercury catalyst for acetylene hydrochlorination and its preparation method

Abstract

The invention discloses a high-dispersion and low-solid mercury catalyst for acetylene hydrochlorination and a preparation method thereof. The catalyst uses coconut shell, melamine and pyrrole formaldehyde as raw materials to prepare a high-area nitrogen-doped carrier, and uses mercury chloride as the main catalyst. Chemically active components, indium chloride as a synergistic catalytic promoter, potassium chloride as a mercury-fixing agent, and nanometer cerium dioxide as an anti-carbon deposition agent, were used to prepare the catalyst in a step-by-step ultrasonic impregnation-infrared drying method under vacuum conditions. The catalyst has the characteristics of large specific surface area, high dispersion of active components, high utilization rate of mercury chloride, high catalytic conversion rate, good anti-coking effect and long service life.

Description

technical field

[0001] The invention relates to a chemical catalyst, in particular to a high-dispersion low-mercury catalyst for acetylene hydrochlorination and a preparation method thereof. Background technique

[0002] In January 2015, the Ministry of Environmental Protection issued the "Notice on Strengthening the Prevention and Control of Mercury Pollution in the Production of Polyvinyl Chloride by the Calcium Carbide Method and Related Industries", proposing that by the end of 2015, the penetration rate of low-mercury catalysts in the calcium carbide process PVC industry would reach 100%, but the low Since the promotion of mercury catalysts, there have been problems such as low activity and short service life. The main reasons are the low dispersion of the active component mercuric chloride or improper use of catalytic promoters. Patent No. CN201310573763.0 Invention Patent "Ultra-Low Mercury Catalyst and Its Production Process", Patent No. 201010203350.X Invention Pate...