Heatproof high oxygen storage denitration catalyst and preparation method thereof

Abstract

The invention provides a heatproof high oxygen storage denitration catalyst and a preparation method thereof. The formula of the catalyst comprises cerium nitrate, lanthanum nitrate, yttrium nitrate,gamma-alumina, nanometer titanium dioxide, a lubricant, a binder, a surfactant, a toughener and pore forming agent. The preparation method comprises the following steps: weighing the gamma-alumina andnanometer titanium dioxide, drying the weighed substances, and cooling the dried substances; adding the cerium nitrate, lanthanum nitrate, yttrium nitrate, the binder, the toughener and the pore forming agent into a pug mill, and performing uniform mixing; placing the obtained pug ball in a muffle furnace, and calcining the pug ball; adding the lubricant and the surfactant, and performing mixingto form a ball; dissolving the remaining cerium nitrate, lanthanum nitrate and yttrium nitrate, and adding a combustible component; and immersing the obtained spherical carrier in a combustion liquid,and performing calcining. The catalyst carrier has a high specific surface area to improve the low-temperature activity and the life of the catalyst; a low-temperature self-propagating combustion coating process is adopted is adopted to achieve uniform distribution of active components in the catalyst; and the spherical catalyst has an improved catalysis efficiency.

Description

technical field [0001] The invention relates to the technical field of preparation methods of environmentally friendly preparations, in particular to a heat-resistant, high-oxygen-storage denitrification catalyst and a preparation method thereof. Background technique [0002] At present, the main coating methods of denitration catalysts are impregnation method and co-precipitation method, but both methods have uneven distribution of catalyst active components on the surface of the carrier, which affects the catalytic activity of the catalyst. In the low-dust arrangement, the flue gas temperature is between 150-200°C, which poses a challenge to the low-temperature activity of the catalyst. Ordinary granular catalysts cannot be directly applied to the denitrification process of boiler flue gas, and must have a certain shape to To play a better role, the SCR monolithic catalysts commonly used in industry are mainly divided into three types: corrugated plate type, flat plate typ...

AI Technical Summary

Problems solved by technology

[0002] At present, the main coating methods of denitrification catalysts are impregnation method and co-precipitation method, but both methods have uneven distribution of catalyst active components on the surface of the carrier, which affects the catalytic activity of the catalyst.

In the low-dust arrangement, the flue gas temperature is between 150-200°C, which poses a challenge to the low-temperature activity of the catalyst. Ordinary granular catalysts cannot be directly applied to the denitrification process of boiler flue gas, and must have a certain shape to To play a better role, the SCR monolithic catalysts commonly used in industry are mainly divided into three types: corrugated plate type, flat plate type and honeycomb type. Among them, the upper and lower modules of the corrugated plate denitration catalyst are easy to be blocked, and the life of the flat plate denitrification catalyst is short. Honeycomb denitrification catalyst has less active components