Precipitation method of titanium dioxide for selective oxidative desulfurization catalyst

Abstract

The invention belongs to the technical field of catalytic chemistry and environmental protection, and particularly relates to a precipitation method of titanium dioxide for a selective oxidative desulfurization catalyst. The titanium dioxide for the selective oxidative desulfurization catalyst is prepared according to the following sequential steps: preparing hydrolyzed seed crystals, hydrolyzingtitanium liquid, washing metatitanic acid by using water, slurrying the metatitanic acid and adding silicon, neutralizing by using ammonia water, filtering and washing, and calcinating and crushing. The selective oxidative desulfurization catalyst prepared from the TiO2 powder can be used at relatively high reaction temperature, so that the adaptive range of the catalytic reaction temperature is widened, and the catalyst can be used in the temperature range of 200-400 DEG C; the TiO2 powder has the specific surface area being larger than 300m<2>/g, so that the prepared catalyst has a large surface area and the reaction activation center of the catalyst is increased; the aging specific surface area of the TiO2 powder is kept good, and after aging at 300 DEG C for 12h, the specific surface area is basically unchanged and the structure is stable, so that the selective oxidative desulfurization catalyst has a long using period.

Description

technical field [0001] The invention belongs to the technical fields of catalytic chemistry and environmental protection, and in particular relates to a preparation method of titanium dioxide for a selective oxidation desulfurization catalyst. Background technique [0002] A large amount of H is produced from flue gas such as natural gas purification, petroleum sulfide catalytic cracking, coal gasification to methanol, etc. 2 S gas, in order to protect the environment and recover sulfur, it is necessary to treat the H in the flue gas 2 S undergoes selective oxidation. The selective oxidation processes that have been developed and put into use are mainly the Claus process and the Clinsulf-Do process. The Clinsulf-Do technology is a selective catalytic oxidation process technology. 2 S and O 2 The reaction in the internal cooling catalyst bed directly generates sulfur without oxidizing H 2 , CO and lower saturated hydrocarbons, the main feature of this technology is that i...

AI Technical Summary

Problems solved by technology

At present, the catalyst of selective catalytic oxidation technology mainly uses anatase TiO 2 For production, ordinary anatase TiO 2 Due to the low specific surface area, the reactant (H 2 S and SO 2 ) provides few active centers, reduces the rate of adsorption and desorption, and affects the catalytic effect of the catalyst; moreover, the reaction temperature is relatively high in the catalytic reaction process, and ordinary anatase TiO 2 The specific surface area of ​​the produced catalyst decays relatively quickly during high temperature use, causing changes in the internal structure of the catalyst, resulting in the loss of active centers and gradually reducing the activity, and even permanently deactivating the catalyst, reducing the service life of the catalyst