Abstract
A series of mesoporous 9Ni x ZrO 2 /SBA-15 were prepared by coupled self-assembly and evaluated for CO 2 /CH 4 reforming, which revealed that high activity and stability of 9Ni9ZrO 2 /SBA-15 correlated closely with the synergistic effects of ZrO 2 crystallite islands and high dispersion of active Ni 0 nanoparticles which promote adsorption of CO 2 and facilitated high efficient conversion of residual CH x species. The XRD, O 2 -TPD, HAADF-Zr mapping and UV–vis DRS analysis verified the existence of stable ZrO 2 crystallites and the formation of surface oxygen vacancies. The XPS and HRTEM images of 9Ni x ZrO 2 /SBA-15 before and after CH 4 /CO 2 reforming proclaimed the distribution of catalyst surface active species, synergistic action between CO 2 and vacancies as well as formation character of CNTs. A catalytic mechanism of CH 4 /CO 2 conversion into CO/H 2 has been put forward. The allotropes of coke and physical properties of catalysts were systematically analyzed by TG/DTG, first derivative XAES, H 2 -TPR, N 2 -physisorption and FT-IR. • 9Ni x ZrO 2 /SBA-15 generated via a self-assembly of Ni-chelate/hydroxyl groups. • O 2 -TPD of 9Ni x ZrO 2 /SBA-15 proved possibility of oxygen migration on anion vacancies. • ZrO 2 crystallite islands improved CO 2 adsorption & high efficient conversion of residual CH x . • 9Ni9ZrO 2 /SBA-15 has excellent activity and long-standing stability.
Published Version
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