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发表时间：2012-01-01

发表刊物：物理化学学报

卷号：28

期号：8

页面范围：1943-1950

ISSN号：1000-6818

摘要：Combining co-precipitation-gelation, mechanical mixing and impregnation methods, a series of catalysts of FeK-M/gamma-Al2O3(M=Cd or Cu) have been attained. The catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), N-2 physisorption, X-ray diffraction (XRD) and temperature-programmed reduction of hydrogen (H-2-TPR). The hydrogenation of carbon dioxide over these catalysts was also investigated in a fixed bed. Given a reaction time of 100 h, CO2 conversion over a 15%Fe/10%K/gamma-Al2O3 catalyst reached 51.3 %, with a selectivity towards C2+. of 62.6 % at 3 MPa, 673 K, a space velocity of 3600 h(-1) and at a molar ratio of H2CO2 of 3. At the lower Fe content of 2.5%, the selectivity towards C2+. was still greater than 60.0%. Increasing the potassium content from 0% to 10%, increased the selectivity towards C-2-C-4(=) and the molar ratio of C-2-C-4(=)/C-2-C-4(0) increased to 3.6. The addition of Cd and Cu improved the reduction and catalytic activities. Specifically, Cu improved the molar ratio of C-2-C-4(=)/C-2-C-4(0) from 3.6 to 5.4, and the Cd increased the selectivity of C5+. by 12%.

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