A Porous Ni@SiO2 Nanocatalysts for CO2 Methane Reforming

Abstract

AbstractPorous Ni@SiO core‐shell catalysts (Ni@SiO2‐xC10) were modified by selective etching in a mild alkaline solution using decyltrimethylammonium bromide (C10TAB). The effects of C10TAB concentration on the Ni@SiO2 nanoparticles were explored and used in the dry reforming of methane. It can change the physicochemical properties of Ni@SiO2, and the modified Ni@SiO2‐xC10 exhibits better catalytic performance than Ni@SiO2. TEM, N2‐isotherm, and H2‐TPR results show that Ni@SiO2‐xC10 modified with a sufficient concentration of C10TAB has a mesoporous core‐shell structure, which not only increases the pore volume and surface area but also enhances the metal‐support interaction; XPS and TEM results indicate that Ni nanoparticles are confined within the mesoporous core‐shell, which inhibits the migration of Ni nanoparticles at high temperature. The Ni@SiO2‐2C10 catalyst showed optimal catalytic performance under reaction conditions of 800 °C, N2 : CH4 : CO2=1 : 1 : 1, and WHSV of 126000 mLgcat−1 h−1 with increased conversion of CH4 (>79 %) and CO2 (>84 %) within 50 h.