Tin manganese cerium lanthanum catalyst and its preparation and application method

Abstract

The invention discloses a Sn-Mn-Ce-La catalyst. A preparation method of the catalyst comprises the following steps: 1) weighing and dissolving metered Mn(NO3)2, Ce(NO3)3*6H2O, La(NO3)3*6H2O and citric acid in water to obtain a mixed solution, and stirring the mixed solution at the constant temperature of 50-80 DEG C for 5-10 hours to obtain a yellow jelly-like substance; 2) drying the yellow jelly-like substance, adding an aqueous SnCl2*2H2O solution, stirring sufficiently, adding ammonia water dropwise and regulating PH to 9-10 to obtain a precipitate and a mother liquor; and 3) filtering, washing and drying the precipitate and roasting the precipitate in air to obtain the Sn-Mn-Ce-La composite oxide catalyst. The catalyst has higher low-temperature catalysis to eliminate the activity, chlorobenzene can be converted completely at the temperature of 190 DEG C-210 DEG C, and inactivation does not occur when continuous reaction is performed for 30 hours at the temperature of 250 DEG C-300 DEG C.

Description

technical field [0001] The invention relates to a tin-manganese-cerium-lanthanum catalyst and a preparation and application method thereof, belonging to the field of gas purification treatment. Background technique [0002] Chlorinated Volatile Organic Compounds (CVOCs) refer to chlorine-containing organic compounds that are volatile at room temperature and have a boiling point between 50°C and 260°C, and most CVOCs have good chemical and thermal stability. , difficult to decompose or biodegradable, long-term retention in nature and other characteristics, become a class of persistent organic pollutants that are difficult to deal with in environmental pollution control. [0003] Most of CVOCs contain a stable benzene ring structure, and the aromatic ring contains chlorine atoms replacing hydrogen. It is difficult to effectively eliminate low-concentration CVOCs by direct incineration and biodegradation methods commonly used in industry, and may also produce toxic intermediate...

AI Technical Summary

Problems solved by technology

[0004] Manganese-based catalysts have attracted extensive attention due to their excellent performance in catalytic combustion of CVOCs, but because the chloride ions generated during the decomposition process of Cl-VOCs are easily adsorbed on Mn active sites, leading to catalyst poisoning, for example, there are reports in the literature, At 330°C, the MnCeLa catalyst is prone to deactivation during the catalytic combustion of chlorobenzene

Therefore, manganese-based catalysts have been greatly restricted in their industrialization.

Images