Titanium dioxide-aluminum oxide composite desulfurization catalyst as well as preparation method and application thereof

Abstract

The invention discloses a titanium dioxide-aluminum oxide composite desulfurization catalyst as well as a preparation method and application thereof. The titanium dioxide-aluminum oxide catalyst is prepared by adopting a sol-gel method, adding an alkaline compound with a proper concentration to adjust the pH value of a solution, aging for a period of time, centrifuging, washing, drying and calcining to obtain the titanium dioxide-aluminum oxide catalyst for catalyzing the hydrolysis reaction of carbonyl sulfide. The catalyst is at least prepared from the following raw materials: an aluminum source, wherein the aluminum source comprises but is not limited to aluminum nitrate, aluminum chloride and aluminum isopropoxide; the titanium source comprises but is not limited to tetrabutyl titanate, titanium tetrachloride and titanyl sulfate, and the adding amount of the titanium ions is 0-0.1 of the total molar number of the metal ions. The composite material desulfurization catalyst prepared by the invention is simple in preparation process, can be directly used as a catalyst without dipping other active components, can effectively catalyze the hydrolysis reaction of carbonyl sulfide in a complex atmosphere, and has good stability.

Description

technical field [0001] The invention relates to a titanium dioxide-alumina composite desulfurization catalyst, a preparation method and application thereof, and belongs to the field of petrochemical industry. Background technique [0002] With the rise of the industrial revolution, the exploitation and application of fossil fuels by humans has gradually increased, and the accompanying environmental problems have gradually emerged. Carbonyl sulfide (COS), as an organic sulfur gas, will cause harm to people, environment and production equipment whether it exists in industry or in the environment. In industry, untreated COS will not only interact with H 2 The O reaction corrodes equipment and poisons the catalyst. The presence of COS also affects the quality of the product. COS is the gas with the highest sulfur content in the troposphere, and tropospheric carbonyl sulfide is the main source of sulfur in the stratosphere, which leads to the formation of stratospheric sulfate,...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent of CN101239319A discloses a preparation method of a desulfurization catalyst, which involves alumina and titania, but the above-mentioned catalyst is a multi-component catalyst, in addition to alumina and titania, it also contains other components, and the preparation method is complicated. Multiple impregnations are required, and the more complex the composition, the easier it is to produce side reactions in the process of COS removal

These catalysts prepared by co-precipitation or impregnation are prone to component stratification or local mixing or uneven doping, which will affect the activity and stability of the catalyst.

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