Citation: ZHU Qiu-Feng, ZHANG Rong-Jun, HE De-Hua. Effect of CaO Modification on Performance of CuZnAlZr Catalyst in Synthesis of Higher Alcohols from Synthesis Gas[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1461-1466. doi: 10.3866/PKU.WHXB201203302
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CaO modified CuZnAlZr mixed oxide catalysts were prepared by mechanical mixing and co-precipitation methods, and their catalytic performances for CO hydrogenation to higher alcohols were investigated using a continuous flow high-pressure fixed-bed micro-reactor. The catalysts were characterized by X-ray diffraction (XRD), N2-adsorption-desorpotion, temperature-programmed reduction of H2 (H2-TPR), and temperature-programmed desorption of CO2 (CO2-TPD). The results showed that doping with CaO did not alter the textural properties of the catalyst, but increased the number of basic sites. Furthermore, the CaO-modified CuZnAlZr catalysts possessed both weak and medium strength basic sites, while unmodified CuZnAlZr catalyst possessed only weak basic sites. Catalytic performance, assessed by CO hydrogenation to C2+ alcohols, was improved in the CaO-doped CuZnAlZr catalyst relative to the undoped catalyst.
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Keywords:
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CaO modification
, - CuZnAlZr catalyst,
- Synthesis gas,
- Higher alcohol
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