Catalyst for deep purification and removal of impurities in olefin stream at room temperature and its preparation and application

Abstract

The invention relates to a catalyst for removing alkene material flow impurity through deep purification at room temperature, a preparation method and an application thereof. According to the invention, the catalyst takes cobalt in an oxidation state as an active component, zinc oxide is taken as a first auxiliary agent, cerium oxide is taken as a second auxiliary agent, the weight ratio of the cobalt in the oxidation state to zinc to cerium is 10-95: 1-30: 1-40, a coprecipitation method is employed for preparation, cobalt in the oxidation state as an active component, zinc oxide and cerium oxide are taken as the auxiliary agents, the prepared nano cobalt-zinc-cerium composite metal oxide catalyst has a sea urchin-shaped microscopic microstructure, and has the advantages of large specific surface area, small particle size, strong CO adsorption capability, and high oxygen vacancies activity, CO can be thoroughly removed (less than or equal to 5ppb) at room temperature, the catalyst has good anti-sulfur performance and water resistance performance, stability is good, and the preparation technology is simple. The catalyst does not require reduction and activation, microscale carbon monoxide in the alkene material can be deeply removed to 5 ppb or below under condition from room temperature to subzero (-20 DEG C-40 DEG C), and can be used in fields of petrochemical industry and environmental protection.

Description

technical field [0001] The invention relates to the fields of olefin purification and environmental protection, in particular to a catalyst for deep purification and removal of impurities in olefin streams at room temperature, as well as its preparation and application. Background technique [0002] In various industrial fields, the presence of trace carbon monoxide is often harmful to the reaction system and needs to be removed as an impurity. With the development of polyolefin technology, highly active polyolefin catalysts, such as metallocene catalysts and single-site catalysts, are more sensitive to poisons. The research results show that in the new liquid phase propylene polymerization process, when the CO content in the reaction system is higher than 10ppb, the impurity CO begins to affect the catalyst activity; when the CO content is higher than 30ppb, a slight change in CO can lead to a rapid decrease in catalyst activity. Therefore, complete removal of CO is a crit...

AI Technical Summary

Problems solved by technology

[0004] However, during the use of copper-based catalysts, there are the following problems: high reaction temperature (generally at 90-150°C), unsuitable for liquid-phase polymerization processes; low activity at room temperature, poor handling capacity for samples with high CO concentration; need to increase Operations such as reduction and activation control a certain degree of reduction, which increases investment and causes inconvenience in operations such as filling and regeneration

[0005] CN104338544A discloses a composite cobalt oxide catalyst containing superacid for deep removal of carbon monoxide. The catalyst includes at least five metal elements such as Co, Mn, and Sb, and can remove CO in olefin materials from 2ppm at 0 to 70°C. Removal to 30ppb, but this process is complex, and in industrial applications, the storage and transportation of super acid reagents and the equipment involved in the reaction have higher requirements

Images