Journal
FUEL
Volume 88, Issue 10, Pages 1915-1921Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2009.04.007
Keywords
HZSM-5; Hydrothermal stability; Trimethyl phosphite; Phosphoric acid; Methanol
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Funding
- Carbon Dioxide Reduction & Sequestration Center (CDRS) [CA2-101-1-0-1]
- Ministry of Science and Technology, Republic of Korea
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The change in properties of ZSM-5 samples was achieved by treatment with phosphorus compounds (trimethyl phosphite or phosphoric acid) and the resultant materials were characterized by N-2 adsorption, NH3-TPD Al-27, and P-31 MAS NMR techniques. The phosphorus-treated HZSM-5 (P/ZSM-5) samples exhibited lower acidity, higher hydrothermal stability and improved dimethyl ether (DME) selectivity in methanol conversion when compared to the phosphorus-free HZSM-5, Al-27, and P-31 MAS NMR results revealed that the added P indeed interacted with the ZSM-5 framework and is responsible for the changes observed in the catalytic properties. The interaction caused the decrease in strong acid sites on one hand and creation of new acid sites (NH3-TPD) on the other, in P/ZSM-5 samples. The studies indicated the need of optimizing the P loading, where the positive role of P on the catalytic activity was observed to be maximum at P/Al molar ratio of 1.05. (c) 2009 Elsevier Ltd. All rights reserved.
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