Confined high dispersion of Ni nanoparticles derived from nickel phyllosilicate structure in silicalite-2 shell for dry reforming of methane with enhanced performance

Abstract

Novel structure catalyst of [email protected] with Ni nanoparticles highly dispersed in silicalite-2 zeolite (S2) was designed and synthesized via novel two-steps methods, micro-emulsion method followed by solvent-free crystallization route. Due to the unique two-step synthetic process, the confinement effect of the silicalite-2 shell and stronger metal-support interaction caused by the formation of Ni phyllosilicate intermediate in shell, were regarded as the main reasons for the superb catalytic performances of [email protected] for dry reforming of methane (DRM). Compared with Ni–SiO2 by micro-emulsion method, Ni/S2 by impregnation method and [email protected]–O by direct crystallization, [email protected] catalyst exhibited optimal catalytic activity and stability for DRM. No activity loss was observed during 70 h at high GHSV of 240000 mL g−1h−1. Meanwhile, over spent [email protected] catalyst, hardly any coke was found after the prolonged test, which indicated the remarkable anti-coking ability of [email protected]