Modulating morphology and textural properties of Al2O3 for supported Ni catalysts toward plasma-assisted dry reforming of methane

Abstract

The synergy between plasma and catalysis has been long noticed, but how to further improve the synergy remains challenging. Herein, a series of Ni/Al2O3 catalysts with different Al2O3 morphologies (nanorod-NR, nanosheet-NS and spherical flower-SF) were investigated for plasma-assisted dry reforming of methane (DRM). Surface properties, metal dispersion, and discharge properties were modulated, and thereby affected catalytic performance and plasma-catalysis synergistic efficiency. Sufficient surface hydroxyls on NS-Al2O3 dispersed and anchored Ni centers via forming Ni-O-Al linkages, and the specific two–dimensional structure facilitated charge deposition and generated a stronger local electric field. Accordingly, the Ni/NS-Al2O3 catalyst showed the best catalytic activity & stability and energy efficiency in the reaction. The present study provides a promising strategy to enhance the synergy and energy efficiency of plasma-catalysis by coupling highly dispersed Ni active centers and specific structures of Al2O3 substrate to obtain an efficient catalyst motivating the DRM reaction under mild conditions.