AI Article Synopsis
- The OXZEO catalyst design shows promise for converting syngas into light olefins, with studies highlighting its effectiveness.
- Face-centered cubic (FCC) MnGaO -Spinel achieves 40% CO conversion and 81% selectivity for light olefins, outperforming other solid solutions like MnGaO.
- The higher performance of MnGaO -Spinel is linked to its greater reducibility and the availability of specific Ga sites that enhance the dissociation of C-O bonds efficiently.
Article Abstract
The 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) MnGaO -Spinel gives 40 % CO conversion, 81 % light olefins selectivity, and a 0.17 g g h space-time yield of light olefins in combination with SAPO-18. In comparison, solid solution MnGaO (characterized by Mn-doped hexagonal close-packed (HCP) Ga O ) 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 MnGaO -Spinel can be attributed to its higher reducibility (higher concentration of oxygen vacancies) and the presence of coordinatively unsaturated Ga sites, which facilitates the dissociation of the C-O bond via a more efficient ketene-acetate pathway to light olefins.
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| http://dx.doi.org/10.1002/anie.202217701 | DOI Listing |
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