Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-24403-2
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Funding
- National Natural Science Foundation of China [21972069]
- Municipal Natural Science Foundation of Tianjin [18JCJQJC47400]
- Fundamental Research Funds for the Central Universities
- Foundation of State Key Laboratory of Coal Conversion [J18-19-603]
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Studying the dynamic changes of SAPO-34 framework during MTO conversion, researchers found that pre-coking and water co-feeding can efficiently suppress T-O-T bond breakage during long-term continuous regenerations, thus promoting catalytic efficiency and long-term stability in commercial MTO processes.
As a commercial MTO catalyst, SAPO-34 zeolite exhibits excellent recyclability probably due to its intrinsic good hydrothermal stability. However, the structural dynamic changes of SAPO-34 catalyst induced by hydrocarbon pool (HP) species and the water formed during the MTO conversion as well as its long-term stability after continuous regenerations are rarely investigated and poorly understood. Herein, the dynamic changes of SAPO-34 framework during the MTO conversion were identified by 1D Al-27, P-31 MAS NMR, and 2D P-31-Al-27 HETCOR NMR spectroscopy. The breakage of T-O-T bonds in SAPO-34 catalyst during long-term continuous regenerations in the MTO conversion could be efficiently suppressed by pre-coking. The combination of catalyst pre-coking and water co-feeding is established to be an efficient strategy to promote the catalytic efficiency and long-term stability of SAPO-34 catalysts in the commercial MTO processes, also sheds light on the development of other high stable zeolite catalyst in the commercial catalysis. Stability of zeolite catalysts is a highly desirable property for commercial methanol to olefins conversion but extremely challenging to achieve. Here, the authors combine the catalyst pre-coking and water co-feeding to develop an efficient strategy to enhance the long-term stability of SAPO-34 catalyst.
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