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以Al2O3为载体,采用吸附-沉淀法制备一系列Ru-Fe/Al2O3催化剂,并进行了H2-TPR、XRD及XPS表征。以马来酸二甲酯(DMM)催化加氢合成丁二酸二甲酯(DMS)为探针反应,考察了Fe的加入对Ru/Al2O3催化性能的影响。评价结果表明,当Fe/Ru原子比小于2时,催化剂活性变化不大;但Fe/Ru原子比大于或等于2时,催化剂活性明显增加;与Ru/Al2O3催化剂相比,Fe的加入改善了催化剂的高温氧化还原处理稳定性。以甲醇为溶剂,在70℃、1.0 MPa压力、600 r/min转速下,Ru-Fe/Al2O3催化DMM的转化率与生成DMS的选择性均接近100%。XPS和H2-TPR表征结果表明,Ru-Fe/Al2O3中Fe与Ru产生较强的相互作用,促进Ru的分散且调变了Ru的电子特性。
A series of Ru-Fe / Al2O3 catalysts were prepared by adsorption-precipitation using Al2O3 as carrier, and characterized by H2-TPR, XRD and XPS. Dimethyl succinate (DMS) was synthesized by catalytic hydrogenation of dimethyl maleate (DMM) as a probe reaction, and the effect of Fe addition on the catalytic performance of Ru / Al2O3 was investigated. The results show that when the Fe / Ru atomic ratio is less than 2, the activity of the catalyst does not change much. However, when the atomic ratio of Fe / Ru is greater than or equal to 2, the catalytic activity increases obviously. Compared with the Ru / Al2O3 catalyst, the addition of Fe improves Catalyst High Temperature Redox Treatment Stability. With methanol as solvent, the conversion of DMM catalyzed by Ru-Fe / Al2O3 was almost 100% selectivity to DMS at 70 ℃, 1.0 MPa and 600 r / min. XPS and H2-TPR characterization results show that Fe and Ru in Ru-Fe / Al2O3 have a strong interaction, which promotes the dispersion of Ru and modifies the electronic properties of Ru.