催化氧化法净化烟气中NO研究进展

ADVANCES IN REMOVAL OF NO IN FLUE GAS BY CATALYTIC OXIDATION PROCESS

一氧化氮(NO)的氧化是发展氨法同时脱硫脱硝技术的关键,本文从NO催化氧化机理、催化剂的类型及抗硫抗水性等角度分析了活性炭、分子筛、贵金属和过渡金属氧化物等催化剂催化氧化NO的性能及存在的主要问题,并提出通过增强催化剂的表面酸性来抑制SO_2的吸附及活性组分的硫酸盐化,是提高催化剂抗硫性能的一个有效途径;另外,可通过增加催化剂表面活性位的绝对数量进而降低H_2O分子对活性位点的占据比例,进而提高SCO催化剂的抗水性能。

The oxidation of nitric oxide（NO） is the key to the development of simultaneous desulfurization and denitrification by the ammonia method. In this paper, from the catalytic reaction mechanism, catalyst types and resistance of water and sulfur to analysis the catalytic oxidation of NO performance and the existing problems of different types of catalysts such as activated carbon, zeolite and noble metal and transition metal oxides, and suggests that the enhancement of the catalyst surface acidity to suppress the SO2 adsorption and activity of sulfate is an effective way to improve the catalyst sulfur resistance performance; on the other hand, increasing the absolute number of active sites on the catalyst surface and reduce the H2 O molecules on the active sites occupied by, so as to improve the water resistance of the SCO catalyst.