Pure-phase zirconium-based desulfurization catalyst, and preparation method and application thereof

Abstract

The invention discloses a pure-phase zirconium-based desulfurization catalyst. The pure-phase zirconium-based desulfurization catalyst is a pure tetragonal-phase regular nanoparticle; and according to the pure-phase zirconium-based desulfurization catalyst, a solvothermal method is utilized, heating and stirring are conducted, a surfactant is added to achieve uniform dispersion of metal, a proper amount of a precipitant is added to promote construction of a structure, and the pure-phase zirconium-based desulfurization catalyst is obtained after a solvothermal reaction through the strategy of adding an organic solvent and regulating the pH value. The pure-phase zirconium-based desulfurization catalyst prepared by the method has a high-crystallinity and regular nano-particle structure, mainly adopts a mesoporous structure and is beneficial to transmission and diffusion of gas molecules, and the number and strength of alkaline sites on the surface of the pure-phase zirconium-based desulfurization catalyst are effectively regulated and controlled; and when the reaction temperature is 70 DEG C, the conversion rate of COS is up to 100%, and the catalyst is suitable for low-temperature catalytic hydrolysis desulfurization of carbonyl sulfide-containing gases such as blast furnace gas and natural gas.

Description

technical field [0001] The invention relates to a pure-phase zirconium-based desulfurization catalyst and its preparation method and application, belonging to the technical field of inorganic material preparation and application. Background technique [0002] Iron and steel is an important pillar industry related to the national economy and people's livelihood. my country's annual pig iron production is nearly 1 billion tons. About 85% of pig iron in my country adopts the blast furnace smelting method with high productivity, low consumption, low cost and long life. Produced CO, H 2 The iron oxide in iron ore is reduced to pig iron, so a huge amount of blast furnace gas will be produced in the process of blast furnace ironmaking. In 2019 alone, the amount of blast furnace gas in my country exceeded 1.5 trillion cubic meters. As a typical representative of gaseous sulfide in blast furnace gas, carbonyl sulfide (COS) is chemically inactive and difficult to remove. The COS rem...

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Problems solved by technology

The Chinese patent application number CN201410369381.0 discloses a carbonyl sulfide hydrolysis catalyst and its preparation method, which discloses the use of zirconia as a carrier, by preferentially impregnating the carrier in a soluble metal salt impregnation solution, and then adding an inorganic alkaline solution, so that the active metal salt ions are uniformly dispersed on the surface of the carrier, and then a carbonyl sulfide hydrolysis catalyst is obtained; the Chinese patent application number CN201310521751.3 discloses a desulfurization catalyst and a method for its preparation and hydrocarbon oil desulfurization, which discloses The desulfurization catalyst contains SAPO molecular sieve, rare earth oxide, zirconia, silicon oxide, zinc oxide and active metal, so that the desulfurization catalyst has good desulfurization activity and desulfurization stability; the above patents all disclose that the desulfurization catalyst contains zirconia, but the above catalyst It also contains a variety of other components, which are prone to side reactions and by-products during the hydrolysis reaction process, which will affect the hydrolysis desulfurization process and inhibit the reaction effect

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