Hierarchical SAPO-34 Catalysts as Host for Cu Active Sites

Abstract

Cu-containing hierarchical SAPO-34 catalysts were synthesized by the bottom-up method using different mesoporogen templates: CTAB encapsulated within ordered mesoporous silica nanoparticles (MSNs) and sucrose. A high fraction of the Cu centers exchanged in the hierarchical SAPO-34 architecture with high mesopore surface area and volume was achieved when CTAB was embedded within ordered mesoporous silica nanoparticles. Physicochemical characterization was performed by using structural and spectroscopic techniques to elucidate the properties of hierarchical SAPO-34 before and after Cu introduction. The speciation of the Cu sites, investigated by DR UV-Vis, and the results of the catalytic tests indicated that the synergy between the textural properties of the hierarchical SAPO-34 framework, the high Cu loading, and the coordination and localization of the Cu sites in the hierarchical architecture is the key point to obtaining good preliminary results in the NO selective catalytic reduction with hydrocarbons (HC-SCR).

软模板法制备多级孔沸石分子筛的研究进展

“…结果表明, 在SDA2和硅 溶胶的配比为3:2时, 分子筛外表面积最大. 一旦SDA2 和硅溶胶的配比大于3:2时, 分子筛的外表面积变小, 图 5 CTAB引导合成SAPO-34分子筛的晶化原理 [65] (网络 版彩图) Brito等 [76] 通过自下而上的方法利用两种介孔模 板剂合成了含铜的多级孔SAPO-34分子筛, 模板剂分…”