The Application of SnO2-based Catalysts for Emission Control
作者单位：College of Chemistry Nanchang University
会议名称：《2015年第十四届全国应用化学年会》
会议日期：2015年
学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术]
关 键 词：Morphology Controllable Synthesis Nano-rod,Nano-sheet CO Oxidation NOx Selective Reduction
摘 要：Tetragonal rutile SnO is an n-type semiconductor with a high melting point of 1630℃, thus possessing excellent thermal stability. In addition, it contains abundant surface deficient oxygen species and its lattice oxygen species is also reducible. Therefore, SnO is a potential catalytic material for air emission control reactions. Over the past decades, while its properties as gas sensor or electrode materials have been extensively investigated, its catalytic properties have been much less profiled. Our previous work has demonstrated that SnO-based fine powder catalysts modified by different rare earth metal oxides show much improved thermal stability as well as CO and CH oxidation activity [1]. Moreover, with various simple and feasible methods, pure SnO nano-rod, nano-sheet, nano-needle and hollow sphere samples have also been successfully synthesized, which show reasonable activity and stability for different air emission control reactions [2,3].It is particularly noted here that although pure SnO nano-rod possesses extremely low surface area(1 m/g) and lacks any active oxygen species, it shows much improved CO oxidation activity in comparison with regular SnO powder, due to the presence of preferentially exposed(110) active facets. With the expectation to achieve applicable catalysts for real emission control processes, in this study, several metal cations, such as Mn, Ce and Cu, have been selected to incorporate into the lattice of SnO nano-rod to further improve the activity of the obtained catalysts. As shown by Fig. 1, all the modified samples have the rod-like morphology. XRD results prove that all the different cations have been introduced into the lattice matrix of SnO to form solid solution structure. Compared with pure SnO nano-rod, all the modified nano-rod catalysts display significantly improved CO oxidation activity, as shown by Fig. 2.