Vapour phase dehydration of crude methanol to dimethyl ether over Na-modified H-ZSM-5 catalysts

V. Vishwanathan, Ki Won Jun, Jae Woo Kim, Hyunseog Roh

Research output: Contribution to journalArticle

177 Citations (Scopus)

Abstract

A series of Na-modified H-ZSM-5 catalysts, with Na content varying from 0 to 80 mol%, were prepared by an impregnation method, characterized by TPD of ammonia and FT-IR pyridine methods, and tested for the dehydration of crude methanol (i.e. pure/anhydrous methanol containing 20 mol% of H2O) in a fixed-bed micro-reactor under normal atmospheric pressure. Though the unmodified H-ZSM-5 catalyst was more active and stable in the presence of water than the commercial γ -Al2O3, the Na modified H-ZSM-5 catalysts showed the optimum activity (CMeOII > 80%) and 100% selectivity for DME in a wide range of temperatures: 230-340 °C. The catalysts were tested for the time-on-stream (TOS) and remained least sensitive towards water for a total reaction period of 65 h. The superior performance of Na-modified H-ZSM-5 catalyst is attributed mainly to the elimination of strong surface acid-sites by partial substitution of Na in H-ZSM-5, resulting in the prevention of coke and/or hydrocarbon formation.

Original languageEnglish
Pages (from-to)251-255
Number of pages5
JournalApplied Catalysis A: General
Volume276
Issue number1-2
DOIs
Publication statusPublished - 2004 Nov 25

Fingerprint

Dehydration
Methanol
Ethers
Vapors
Catalysts
Water
Temperature programmed desorption
Hydrocarbons
Ammonia
Impregnation
Coke
Pyridine
Atmospheric pressure
Substitution reactions
dimethyl ether
Acids
Temperature

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Vishwanathan, V. ; Jun, Ki Won ; Kim, Jae Woo ; Roh, Hyunseog. / Vapour phase dehydration of crude methanol to dimethyl ether over Na-modified H-ZSM-5 catalysts. In: Applied Catalysis A: General. 2004 ; Vol. 276, No. 1-2. pp. 251-255.
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Vapour phase dehydration of crude methanol to dimethyl ether over Na-modified H-ZSM-5 catalysts. / Vishwanathan, V.; Jun, Ki Won; Kim, Jae Woo; Roh, Hyunseog.

In: Applied Catalysis A: General, Vol. 276, No. 1-2, 25.11.2004, p. 251-255.

Research output: Contribution to journalArticle

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