Single-step dimethyl ether synthesis |on a Cu/ZnO/Al2O3/ZrO2 +γ-Al2O3 bifunctional catalyst in slurry reactor
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摘要: 采用共沉淀法，制备了纤维状CD501甲醇合成催化剂，采用SEM、TEM、XRD和BET等手段对催化剂进行了表征；并将其进一步和γ-Al2O3进行混合，获得了Cu/ZnO/Al2O3/ZrO2+γ-Al2O3双功能催化剂，考察了其在浆态床中一步法合成二甲醚过程的催化特性。结果表明，相比商业催化剂(COM)和LP201催化剂，新型的CD501催化剂具有更大的比表面积和Cu/Zn分散性。对于浆态床中一步法合成二甲醚过程，采用CD501与γ-Al2O3双功能催化剂，相比采用COM或LP201与γ-Al2O3双功能催化剂，CO转化率提高了一倍，且经过270h测试，CO转化率从61%降至57%，二甲醚时空产率从0.54g/(g·h)降至0.48g/(g·h)，稳定性显著优于COM催化剂。当反应温度为250℃，压力为4.0MPa，空速为3000mL/(g·h)，氢碳比为1.0时，该催化剂应用在浆态床一步法合成二甲醚时，CO转化率为61%，DME时空产率达到0.54g/(g·h)。
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关键词:
- Cu/ZnO/Al2O3/ZrO2催化剂 /
- γ-Al2O3 /
- 浆态床 /
- 二甲醚 /
- 甲醇
Abstract: A fibrous CD501 methanol synthesis catalyst was prepared by a novel coprecipation method and characterized by SEM, TEM, XRD and BET. For Cu/ZnO/Al2O3/ZrO2+γ-Al2O3 bifunctional catalyst which is a mixture of CD501 and γ-Al2O3, the catalytic performance for dimethyl ether (DME) synthesis was evaluated in a slurry reactor. The characterization showed that the CD501 catalyst had a larger specific surface area and a higher Cu/Zn dispersion than those of a commercial catalyst (COM) and LP201 catalyst. For the DME synthesis in a slurry reactor using CD501+γ-Al2O catalyst, the CO conversion is twice as that on the COM+γ-Al2O3 or LP201+γ-Al2O3 catalyst. After 270h test, the CO conversion decreased from 61% to 57%, the space time yield of DME decreased from 0.54g/(g·h) to 0.48g/(g·h), respectively. Compared with COM catalyst, the stability of the present reported catalyst was much improved.When reaction temperature is 250℃, pressure 4.0MPa, space velocity 3000mL/(g·h), and H/C mol ratio 1.0, the CO conversion reached 61%, and space time yield of DME reached 0.54g/(g·h).-
Key words:
- Cu/ZnO/Al2O3/ZrO2 catalyst /
- γ-Al2O3 /
- slurry reactor /
- dimethyl ether /
- methanol
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