Dynamic modification of pore opening of SAPO-34 by adsorbed surface methoxy species during induction of catalytic methanol-to-olefins reactions

Journal Article · Sat Dec 01 04:00:00 EST 2018 · Applied Catalysis. B, Environmental

DOI:https://doi.org/10.1016/j.apcatb.2018.05.090· OSTI ID:1457602

Lo, B. T. W.; Ye, L.; Chang, G. G. Z.; Purchase, K.; Day, S.; Tang, C. C.; Mei, D.; Tsang, S. C. E.

Here, we report that the pore opening of SAPO-34 can be significantly modified by an adsorbed surface methoxy species during induction of the catalytic methanol-to-olefins process, which offers molecular sieving properties due to physical obstacle of the methoxy group and its adsorption modification to other hydrocarbons. X-ray powder diffraction and Rietveld refinement clearly reveal that the adsorbed single carbon atom as the methoxy group is dynamically created from methanol dehydration on a Brønsted acid site in close proximity to the pore windows. As a result, industrial desirable smaller olefins such as ethylene and propylene can be favourably made at the expenses of higher olefins. The structures and fundamental understanding in alteration in the olefins selectivity during induction may allow rational optimisation in catalytic performance under the complex fluidisation conditions.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1457602
• Report Number(s): PNNL-SA-135309; 49734; KC0302010
• Journal Information: Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Journal Issue: C Vol. 237; ISSN 0926-3373
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory