Effect of oxide dispersion in a bifunctional catalyst on the formation of dimethyl ether
- Tsinghua Univ., Beijing (China). State Key Lab. of Chemical Technology
In terms of the mechanisms of methanol synthesis from synthesis gas and methanol dehydration, it was predicted that the yield of dimethyl ether (DME) would be greatly increased if the inter-dispersion of the oxide particles in the catalyst was enhanced. For comparison, 4 methods-- bi-hydrolysis precipitation and three other methods were used to prepare the catalysts: (1) Low-dispersion mixing: A commercial Cu/Zn/Al methanol catalyst having a size range of 20--40 mesh was mechanically mixed with a dehydration catalyst {gamma}-alumina with the same size range; (2) High-dispersion mixing: The two catalysts used in 1 were ground together to {minus}200 mesh and pelletized and then crushed to 20--40 mesh; (3) Co-precipitation impregnation as reported in a cited reference; (4) Bi-hydrolysis precipitation: An aqueous solution of mixed nitrates of copper and zinc and an aqueous solution of NaAlO{sub 2} were simultaneously dropped into a beaker containing some deionized water. A precipitate was formed which was filtered, washed, dried and calcined. The particle size of the catalysts prepared by methods 3 and 4 charged into the reactor were in the same range as those by methods 1 and 2. Catalysts prepared by methods 1, 2, 3 and 4 are designated as Cat-1, Cat-2, Cat-3 and Cat-4 respectively. The inter-dispersion of the oxides particles were in the order of Cat-1 < Cat-2 < Cat-3 < Cat-4. The catalysts were evaluated for activity in a tubular flow reactor with a feed having a mole composition of H{sub 2}/CO/CO{sub 2} = 64/31/5 under 270 C, 3 MPa and a space velocity of 2000 h{sup {minus}1}. Results are presented in a table and briefly discussed.
- OSTI ID:
- 324769
- Report Number(s):
- CONF-970931-; TRN: IM9911%%466
- Resource Relation:
- Conference: 14. annual international Pittsburgh coal conference and workshop: clean coal technology and coal utilization, Taiyuan (China), 23-27 Sep 1997; Other Information: PBD: 1997; Related Information: Is Part Of Fourteenth annual international Pittsburgh coal conference and workshop: Proceedings; PB: [1500] p.
- Country of Publication:
- United States
- Language:
- English
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