Preparation of catalyst with carrier of ceria-zirconia solid solution and application of catalyst in NOx removal

Abstract

The invention relates to a preparation method of a catalyst i.e., supported transition metal chrome with a carrier of a ceria-zirconia solid solution, and application of the catalyst in selectively catalytic oxidizing NO in flue gases. The preparation method of the catalyst comprises the following steps: 1, that cerium nitrate and zirconium oxychloride are dissolved in deionized water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the carrier of the ceria-zirconia solid solution; and 2, that chromic nitrate and the ceria-zirconia solid solution are dissolved in water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the catalyst Cr / CexZr1-xO2. The catalyst prepared in the invention increases superoxide radicals to the carrier which is used for catalytic oxidizing NO, thereby assisting migration and diffusion of bulk phase oxygen, and facilitating the NO to be oxidized on carrier surface. Thus, the catalyst has good capability of catalytic oxidizing NO.

Description

technical field [0001] The invention relates to a catalyst preparation method and its application, in particular to a preparation method of transition metal chromium supported by cerium-zirconium solid solution and its application in selective catalytic oxidation of NO in flue gas, which belongs to inorganic chemical field. [0002] Background technique [0003] At present, my country's energy consumption is increasing rapidly, and the number of motor vehicles is increasing year by year. NO x Emissions continue to rise, and the type of acid rain has changed from sulfuric acid to compound sulfuric acid and nitric acid. With SO 2 Removal technology is becoming more and more mature, NO x Removal has become a hot research topic. [0004] So far applied to NO x Various methods of removal include: Selective Catalytic Reduction (SCR), Continuous Regeneration Replenishment (CRT), NO x Storage and reduction (NSR) and wet denitrification, etc., these methods have in common that...

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Problems solved by technology

F. Ocampo et al. (F. Ocampo, B Louis, A Kiennemann, et al. CO2 methanolation over Ni-Ceria-Zirconia catalysts: effect of preparation and operating conditions [J]. Materials Science and Engineering , 2011, 19: 1-11) studied the methanation of CO2 using cerium-zirconium solid solution as a carrier, and prepared cerium-zirconium solid solution by pseudo-sol-gel method, the preparation method is relatively complicated

Zhong Wang et al. (Zhong Wang, Zhenping Qu, Xie Quan, et al. Selective catalytic oxidation of ammonia to nitrogen over ceria-zirconia mixed oxides [J]. Applied Catalysis A: General, 2012, 411-412: 131-138) to The catalytic oxidation of ammonia (NH3) was studied using cerium-zirconium solid solution as a carrier, but cetyltrimethylammonium bromide (CTAB) was used as a dispersant in the preparation of the carrier. slightly complicated

B. Caglar et al. (B. Caglar, D. Uner. NO oxidation and NOx storage over Ce-Zr mixed oxide supported catalysts [J]. Catalysis Communications, 2011, 12: 450-453) will Cerium-zirconium solid solution is used for the storage and reduction (NSR) of NO, but the preparation method of its carrier is more complicated, and the complexing agent citric acid and ethylene glycol are used

Moreover, in the current research on cerium-zirconium solid solution, it has not been applied to the catalytic oxidation of NO, so the present invention takes this as an innovative point, and uses it as a carrier to support transition metal chromium for catalytic oxidation of NO, and has achieved good results. Effect

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