期刊
JOURNAL OF CATALYSIS
卷 329, 期 -, 页码 379-388出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2015.05.025
关键词
Methanol conversion; SAPO-34; Deactivation; Hydrothermal stabilization; Nanocrystal
资金
- Spanish MINECO [Consolider Ingenio 2010-MULTICAT CSD2009-00050, MAT2012-37160, CTQ2012-37925-C03-1, Severo Ochoa SEV-2012-0267]
- Generalitat Valenciana by the PROMETEO program [PROMETEOII/2013/011]
- China Scholarship Council (CSC)
- Major International Joint Research Project of China [21320102001]
- Servicio de Microscopia Electronica (UPV)
Nano-SAPO-34 zeolite catalyst (20 nm crystal size) has been stabilized by hydrothermal treatment. After steamed at high temperatures (T >= 550 degrees C), its textural properties and high lifetime during the reaction of methanol to olefins (MTO) are preserved, despite the decrease in acidity, even after months of contact with moisture. The stabilization effect is attributed to the migration of silicon to larger silicon islands in which the contribution of silicon on the edge is lower after steaming. Stabilization is not successful by a thermal treatment in air in the absence of water. Steaming at temperature >400 degrees C is required for achieving hydrothermal stabilization. A stability test for SAPO-34 in MTO reaction is proposed. (C) 2015 Elsevier Inc. All rights reserved.
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