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Pure γ-Fe2O3 was prepared by two steps. L(+)-Tartaric acid and Fe(NO3)3·9H2O were sequentially dissolved into water, then the stick liquid was dried and calcined in air. Promoter Pd and K were added to Fe2O3 by impregnation. The influence of Pd or K on Fe2O3 was different in view of the reducibility of Fe2O3, H2 and CO2 adsorption. But synergistic effects were observed from the catalyst co-promoted...
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