Citation: WANG Yan, WANG Wen-li, CHEN Yue-xian, ZHENG Jia-jun, LI Rui-feng. Synthesis of dimethyl ether from syngas using a hierarchically porous composite zeolite as the methanol dehydration catalyst[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(7): 875-882. shu

Synthesis of dimethyl ether from syngas using a hierarchically porous composite zeolite as the methanol dehydration catalyst

1.
1. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;

Corresponding author: LI Rui-feng,
Received Date: 11 April 2013
Available Online: 9 June 2013
Fund Project: National Natural Science Foundation of China (21246003) (21246003)Research Fund for Doctoral Program of Higher Education (20121402120011). (20121402120011)

Hierarchically porous composite zeolite (BFZ, with Beta zeolite cores and Y zeolite polycrystalline shells) was employed as the methanol dehydration catalyst in the direct synthesis of dimethyl ether (DME) from syngas in a fixed-bed reactor. The correlation between the catalytic activity and the textural and acid properties of the dehydration catalyst was investigated. The results indicate that the composite zeolite of H-form (HBFZ) exhibits moderate acid strength and meso-porosity, which is responsible for the high activity of CO hydrogenation. For the direct synthesis of DME from CO hydrogenation over the physical mixture of commercial CuO/ZnO/Al₂O₃ catalyst (CZA) and the H-form zeolites (HBFZ or HY), CZA/HBFZ exhibits higher activity and stability than CZA/HY. Under 250 ℃, 5.0 MPa and 1 500 h^-1, the conversion of CO and the selectivity to DME over CZA/HBFZ achieve 94.2% and 67.9%, respectively.
- composite zeolite,
- dimethyl ether,
- hybrid catalysts,
- hierarchical pore structure,
- syngas,
- methanol dehydration
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