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 language | English |
|---|---|
| Pages (from-to) | 251-255 |
| Number of pages | 5 |
| Journal | Applied Catalysis A: General |
| Volume | 276 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2004 Nov 25 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Process Chemistry and Technology
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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 journal › Article
TY - JOUR
T1 - Vapour phase dehydration of crude methanol to dimethyl ether over Na-modified H-ZSM-5 catalysts
AU - Vishwanathan, V.
AU - Jun, Ki Won
AU - Kim, Jae Woo
AU - Roh, Hyunseog
PY - 2004/11/25
Y1 - 2004/11/25
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=6444236339&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=6444236339&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2004.08.011
DO - 10.1016/j.apcata.2004.08.011
M3 - Article
AN - SCOPUS:6444236339
VL - 276
SP - 251
EP - 255
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
IS - 1-2
ER -