Affiliation:
1. State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Department of Chemical Physics University of Science and Technology of China Jinzhai Road 96 Hefei 230026 P. R. China
Abstract
AbstractThe oxide–zeolite (OXZEO) catalyst design concept has been demonstrated in an increasing number of studies as an alternative avenue for direct syngas conversion to light olefins. We report that face‐centered cubic (FCC) MnGaOx‐Spinel gives 40 % CO conversion, 81 % light olefins selectivity, and a 0.17 g gcat−1 h−1 space‐time yield of light olefins in combination with SAPO‐18. In comparison, solid solution MnGaOx (characterized by Mn‐doped hexagonal close‐packed (HCP) Ga2O3) with a similar chemical composition gives a much inferior activity, i.e., the specific surface activity is one order of magnitude lower than the spinel oxide. Photoluminescence (PL), in situ Fourier‐transform infrared (FT‐IR), and density functional theory (DFT) calculations indicate that the superior activity of MnGaOx‐Spinel can be attributed to its higher reducibility (higher concentration of oxygen vacancies) and the presence of coordinatively unsaturated Ga3+ sites, which facilitates the dissociation of the C−O bond via a more efficient ketene–acetate pathway to light olefins.
Funder
National Natural Science Foundation of China
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
Dalian Science and Technology Innovation Fund
Chinese Academy of Sciences
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