Effect of tin on Ru-B/γ-Al2O3 catalyst for the hydrogenation of ethyl lactate to 1,2-propanediol
Effect of tin on Ru-B/γ-Al2O3 catalyst for the hydrogenation of ethyl lactate to 1,2-propanediol
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DOI：
10.1016/j.apcata.2004.07.024
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发表时间：
2004-11
影响因子：
5.5
通讯作者：
Ge Luo;Shirun Yan;M. Qiao;Ji-Hua Zhuang;Kangnian Fan
中科院分区：
文献类型：
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作者：
Ge Luo;Shirun Yan;M. Qiao;Ji-Hua Zhuang;Kangnian Fan
采用新型还原剂浸渍法制备了γ-Al2O3负载的非晶Ru-B，用于乳酸乙酯加氢生成1,2-丙二醇(PDO)。利用原位XRD、TEM、H2-TPD、XPS和乳酸乙酯液相加氢研究了锡对Ru-B/γ-Al2O3催化剂组成、理化性能、热稳定性和反应行为的影响。采用还原剂浸渍法制备的Ru-B/γ-Al2O3催化剂对乳酸乙酯加氢表现出良好的活性。添加适量的锡（Sn/Ru原子比为7%）显着提高了乳酸乙酯的转化率和1,2-PDO的选择性；在温和的反应条件下，乳酸乙酯转化率为90.7%，1,2-PDO的选择性为91.5%。表征表明，锡的添加显着改善了Ru-B的分散性和热稳定性。在研究范围内，催化剂的B/Ru比、Ru的电子密度和催化剂的氢吸附强度随着锡含量的增加而增加。
Amorphous Ru-B supported on γ-Al2O3was prepared by a novel reductant impregnation method for the hydrogenation of ethyl lactate to 1,2-propanediol (PDO). The effects of tin on composition, physicochemical properties, thermal stability and reaction behavior of Ru-B/γ-Al2O3catalyst were studied by using in situ XRD, TEM, H2-TPD, XPS and liquid phase hydrogenation of ethyl lactate. The Ru-B/γ-Al2O3catalyst prepared by reductant impregnation showed good activity for hydrogenation of ethyl lactate. Addition of suitable amounts of tin (Sn/Ru atomic ratio of 7%) significantly increased the ethyl lactate conversion and the selectivity to 1,2-PDO; a selectivity to 1,2-PDO of 91.5% was obtained at ethyl lactate conversion of 90.7% under mild reaction conditions. The characterizations showed that addition of tin improved the dispersion and thermal stability of Ru-B significantly. The B/Ru ratio of the catalyst, the electron density of Ru, and the strength of hydrogen adsorption of the catalyst increased with increase of tin content over the range studied.