催化燃烧催化剂抗硫性的研究进展

Research progress in the sulfur resistance of catalytic combustion catalysts

  • 摘要: 在实际工业环境中,废气(包括甲烷、乙烷以及VOCs)中通常会带有一些含硫物种,这些物种在氧化反应过程中会侵占催化剂表面活性位,引起催化剂的短暂物理失活。当有毒物质与主活性物种发生反应可引发永久性失活,从而造成催化剂的中毒失效。本文综述了贵金属、复合金属氧化物以及钙钛矿型催化剂应用于废气催化燃烧反应中的抗无机硫和有机硫性能,讨论分析了催化剂的中毒机理,提出了一些提高催化剂抗毒性的方法和手段,为开发具有高抗硫中毒特性的催化剂提供了一定的思路和方向。

     

    Abstract: In the industrial circumstances, sulfur-containing species are frequently present simultaneously in the exhaust gas, containing methane, ethane and volatile organic compounds (VOCs). These species may occupy the active sites on the catalyst surface during the oxidation reaction, causing temporary physical deactivation of the catalyst. Moreover, permanent deactivation might occur when sulfur-containing species react with the active sites, which thereby causes the poisoning and invalidation of the catalysts. This paper reviewed the anti-toxicity properties of precious metals, composite metal oxides and perovskite-type catalysts adopted in the catalytic combustion of exhaust gas. The detailed poisoning mechanism of the catalysts was discussed, and the way to improve the anti-toxicity of the catalyst was also proposed accordingly. This review may provide some insight into the development of catalysts with high resistance to sulfur poisoning.

     

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