Hydrogen sulfide selective oxidation catalyst and preparation method thereof

Abstract

The invention belongs to the technical field of sulfur recovery, and particularly relates to a hydrogen sulfide selective oxidation catalyst and a preparation method thereof, wherein the raw materialsof the carrier comprise metatitanic acid, silica powder and calcium silicate, iron oxide and calcium oxide are used as active components, and the silica powder is fumed silica powder having a specific surface area of 40-60 m<2>/g. According to the present invention, by using the carrier of the invention, the catalyst can have a suitable pore structure, the Claus reverse reaction of the catalyst at the selective oxidation stage can be avoided, and the sensitivity of the catalyst to water vapor and the oxygen content can be reduced; the catalyst has characteristics of high activity, insensitivity to water vapor and oxygen content in the process gas, high side pressure and high H2S conversion rate; and by using the catalyst, the hydrogen sulfide conversion rate can reach more than 95%, the sulfur yield can reach more than 90%, and the side pressure strength can reach more than 120 N/cm so as to improve the sulfur recovery rate of the sulfur recovery device and achieve the significant economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and in particular relates to a hydrogen sulfide selective oxidation catalyst and a preparation method thereof. Background technique [0002] Among the sulfur recovery processes, the direct oxidation process has attracted widespread attention due to its simple operation and high sulfur recovery rate. It uses a special catalyst to directly catalyze the oxidation of hydrogen sulfide in the process gas to elemental sulfur. This process can handle both lean acid gas and conventional Claus tail gas. There are many direct oxidation processes, such as the Clinsulf~Do process of the German Linder Company, the Hi~Activity process of the Parsons Company, and the Catasulf process of the BASF Company. Among them, the most widely used is the Super Claus process, which is currently the most successful and widely used direct oxidation process. [0003] The Super Claus process is one of the direct oxid...

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Problems solved by technology

[0004] At present, there are few grades of hydrogen sulfide selective oxidation catalysts developed at home and abroad. Generally speaking, the yield of sulfur in the existing catalysts is not high, and there are the following problems: (1) The catalyst is sensitive to the oxygen content in the process gas. High catalyst selectivity becomes poor, and low oxygen content affects catalyst conversion rate; (2) catalyst has poor selectivity to sulfur, resulting in low sulfur yield, which affects the sulfur recovery rate of sulfur plant; (3) catalyst is sensitive to water , the catalytic activity is greatly affected by the water vapor content, and some catalysts are required to be used under low water content (volume content less than 5%) or anhydrous conditions, but after the secondary Claus reaction, the water vapor content in the gas is below 25 % or more, unable to meet the requirements of this type of catalyst; (4) The strength of the catalyst is poor, and the lateral pressure strength is generally lower than 100N / cm, which is not conducive to the long-term operation of the device

Since the catalyst uses titanium dioxide as a carrier, it is sensitive to water and can only be used to treat gases with anhydrous or low water content (less than 5%)

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