A kind of highly dispersed ruthenium-based catalyst for acetylene hydrochlorination and preparation method thereof

Abstract

The invention discloses an acetylene hydrochloride high-dispersity ruthenium-based catalyst and a preparation method thereof. The catalyst is prepared from PtCl2 serving as a main catalyzing component, KCl and InCl3 serving as catalyzing assistants, TiO2 which is less than 5nm in particle diameter serving as a dispersing agent, hydrochloric acid serving as a competition adsorbent and nitrogen-doped active carbon serving as a carrier by an ultrasonic stepwise impregnation-microwave drying method. The catalyst has the advantages of high dispersity, small active site, narrow particle size distribution, good carbon deposition resisting effect, high catalytic conversion rate, short induction period and long service life.

Description

technical field [0001] The invention relates to a chemical catalyst, in particular to a highly dispersed ruthenium-based catalyst for acetylene hydrochlorination and a preparation method thereof. Background technique [0002] In January 2011, 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 method PVC industry would reach 100%; by 2013 On October 10, 2019, at the Diplomatic Plenipotentiary Conference of the Minamata Convention hosted by the United Nations Environment Program held in Japan, representatives of 92 countries and regions, including China, signed the Minamata Convention to jointly control and reduce global mercury emission. [0003] The existing catalysts have the disadvantages of large partic...

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Problems solved by technology

[0003] The existing catalysts have the disadvantages of large particle size of catalytically active components, small specific surface area, low dispersion, low catalytic conversion rate, short service life, easy to cause environmental pollution, and high cost

The main reasons are: ① low dispersion, improper selection of preparation process, carrier, dispersant, and competitive adsorbent, resulting in the existence of active components in the form of clusters, some active components are not effectively combined with the carrier, and the catalytic conversion rate is low. Low; ②Chemical deactivation, the catalyst has a weak adsorption capacity for hydrogen chloride. During the contact process between the mixed gas of acetylene and hydrogen chloride and the catalytic active component, acetylene is easy to reduce the catalytic active component; ③Deactivation by carbon deposition, acetylene self-polymerization reaction Produce self-polymers, which block the catalytic active components; ④ Some catalysts choose noble metals as catalytic active components, and the cost is high

⑤The mechanical strength is low, and the catalyst is damaged during transportation, filling and overturning to generate dust, which causes inactivation due to the dust covering the active sites