Effects of glucose and Pd on the structure and performance of cobalt-based catalyst for F-T synthesis
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摘要: 采用等体积浸渍法制备SiO2负载的钴基催化剂，利用N2低温吸附、XRD、SEM和H2-TPR等方法表征了在浸渍操作中添加葡萄糖和助剂Pd对催化剂结构和性质的影响，并在固定床反应器中评价了催化剂的费托合成反应性能。葡萄糖和Pd能够改变Co3O4晶粒形状，添加葡萄糖提高了Co3O4的分散程度，助剂Pd促进了Co3O4还原。两者的联合使用则同时提高了钴物种分散度和还原度，从而改善了催化剂的费托合成反应活性和C5+烃选择性。Abstract: Co-based catalyst was prepared by impregnation method with SiO2 as the support. The effects of glucose and Pd on the structure and property of the catalysts were characterized by N2 low-temperature adsorption, XRD, SEM and H2-TPR. The reactive performance of the catalysts in F-T synthesis was evaluated in a fixed-bed reactor. The shape of Co3O4 crystal particle was changed by the added glucose and Pd. The addition of glucose increased the dispersion of Co3O4 species, and the addition of Pd promoted the reduction of the catalyst although its dose was only 0.0125%. The combination of glucose and Pd increased the dispersion and reduction of Co3O4 species on the catalysts simultaneously. As the result, both of the CO conversion and the selectivity of C5+ hydrocarbons increased in F-T synthesis reaction.
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Key words:
- Co/SiO2 /
- glucose /
- Pd /
- F-T synthesis
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图 3 葡萄糖和Pd对Co3O4不同晶向晶粒粒径的影响
Figure 3 Size changes of Co3O4 crystal in the oxide catalysts along different face index
表 1 氧化态催化剂的织构性质
Table 1 Textural properties of the oxide catalysts
Sample Surface area A/(m2·g-1) Pore volume v/(cm3·g-1) Pore diameter d/nm SiO2 275.6 1.01 9.9 A 209.0 0.73 10.1 A-G 217.1 0.78 10.1 A-P 218.6 0.78 10.1 A-GP 226.9 0.82 10.2 
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表 2 催化剂的费托反应性能
Table 2 Catalyst′s performance in F-T synthesis
Catalyst CO conversion x/% Selectivity s/% CH4 CO2 C5+ A 44.4 8.2 0.7 82.7 A-G 48.1 8.0 1.0 82.9 A-P 55.8 8.1 0.9 83.3 A-GP 58.1 7.5 1.2 84.1 reaction conditions: 230 ℃, 2.0 MPa, 3600 mL/(h·gcat), H2/CO(volume ratio)=2
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