造孔剂对低温锰基多孔陶瓷NH_(3)-SCR催化剂性能的影响

Effect of pore-forming agent on properties of NH_(3)-SCR catalyst for low temperature manganese-based porous ceramics

本文采用造孔剂法制备了以埃洛石(HAL)为添加剂的硅藻土(DE)基多孔陶瓷,并以该多孔陶瓷为载体,通过原位生长法制备了锰基硅藻土多孔陶瓷催化剂.探究了造孔剂的种类和含量对多孔陶瓷结构与形貌以及对催化剂脱硝性能的影响.采用XRD、SEM、XPS等方法对多孔陶瓷以及催化剂的理化性质进行了表征,结果表明,造孔剂的种类与含量影响多孔陶瓷的结构与形貌,更粗糙的表面和更高的孔隙率为MnO_(x)提供了更多的附着位点.此外,选取适当的造孔剂可以促进所制备样品表面原子价态分布,提升表面酸性位点含量,并增强其氧化还原能力,增强催化剂的脱硝性能.

Diatomite(DE)based porous ceramics with halloysite(HAL)as additive were prepared by pore-forming agent method,and the porous ceramic was used as the carrier to prepare manganese based diatomite porous ceramic catalyst by in-situ deposition method.The influence of the type and content of pore-forming agent on the structure and morphology of porous ceramics and on the deNO_(x)performance of catalyst were investigated.The physical and chemical properties of porous ceramics and catalysts were characterized by XRD,SEM,XPS and other methods.The results show that the type and content of pore-forming agent affect the structure and morphology of porous ceramics,rougher surfaces and higher porosity provide more attachment sites for MnO_(x).In addition,the selection of appropriate pore-forming agent can promote the surface atomic valence distribution of the sample,improve the content of acid sites on the surface,and enhance the redox ability of the catalyst,improve the deNO_(x)performance.