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SO2 deactivation mechanism of NO oxidation and regeneration of the LaCoO3 perovskite

机译：二氧化硫的氧化和失活机制再生的LaCoO3钙钛矿

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摘要

The deactivation mechanism and methods to cope with the poisoning by SO2 of LaCoO3 perovskite-based NO oxidation catalysts were investigated. The LaCoO3 perovskite was synthesized by a sol-gel method and the fresh, sulphate-deactivated and regenerated catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, H-2-and soot-temperature programmed reduction, temperature programmed desorption and diffuse reflectance infrared Fourier transform spectroscopy. The SO2 poisoning strongly affected the NO oxidation activity. It was demonstrated that the deactivation mechanism proceeds in two stages: initially the active sites with a basic character are blocked by SO3 and subsequently the lanthanum sulphate salts grow progressively on the surface and cobalt is unaffected. Above 500 degrees C, the surface bound sulphates become mobile and migrate into the bulk of the catalyst. Several prevention and regeneration methods were proposed and tested. By mixing the catalyst with Ca(OH)(2) as an adsorbent nearly 50% of the original activity was retained. Regeneration by diesel soot was presented here for the first time, where the blocking oxygen can spill over to the soot oxidizing it and releasing the bound sulphur as SO2 and CO2. Furthermore, a facile regeneration method was explored by washing the deactivated catalyst to dissolve the small amounts of sulphates on the surface.
机译：失活机理和方法应对与中毒LaCoO3的二氧化硫perovskite-based没有氧化催化剂调查。由溶胶-凝胶合成法和新鲜,sulphate-deactivated和再生催化剂通过x射线衍射、x射线光电子能谱,H-2-andsoot-temperature编程减少,程序升温解吸和扩散反射红外傅里叶变换光谱学。无氧化活性。在两个失活机理的收益最初阶段:基本活动网站字符被SO3,随后硫酸镧盐逐渐在成长表面和钴是未受影响。度,表面束缚硫酸盐移动和迁移到大量的催化剂。几种预防和再生方法提出和测试。Ca (OH)(2)作为吸附剂的近50%最初的活动是保留。柴油烟尘是第一时间,阻止氧气可以溢出来烟尘氧化,释放束缚硫,二氧化硫和二氧化碳。再生方法被洗了停用催化剂溶解的小大量的硫酸盐表面上。

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