In situ nanoscale wet imaging of the heterogeneous catalyzationof nitriles in a solution phase: novel hydrogenation chemistry through nanocatalysts on nanosupports
In situ nanoscale wet imaging of the heterogeneous catalyzationof nitriles in a solution phase: novel hydrogenation chemistry through nanocatalysts on nanosupports
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溶液相中腈多相催化的原位纳米级湿成像：通过纳米载体上的纳米催化剂实现新型加氢化学
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发表时间：
2005
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通讯作者：
E. Boyes
中科院分区：
文献类型：
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作者：
P. Gai;K. Kourtakis;E. Boyes
介绍了在可还原的纳米二氧化钛载体上的新型介孔钴促进钌纳米催化剂上复杂腈在液相中的非均相氢化的湿环境透射电子显微镜研究。动态液相加氢脱附的有机产物在纳米尺度上原位成像。对“纳米复合材料”催化剂的直接研究与平行反应化学测量相关。它们在低操作温度下在与纳米载体表面的刘易斯酸位点相关的原子尺度阴离子空位缺陷的存在下表现出高氢化活性，并且对促进剂机制具有电子和协同贡献。两种金属之间的组合协同效应以及与还原的纳米载体的相互作用导致电子修饰，从而产生用于氢化催化的高反应性位点。结果表明，新的选择性加氢化学与介孔纳米催化剂系统的纳米载体。
Wet-environmental transmission electron microscopy studies of heterogeneous hydrogenation of complex nitriles in a liquid phase over new mesoporous cobalt-promoted ruthenium nanocatalysts on reducible nanotitania supports are presented. The desorbed organic products in the dynamic liquid phase hydrogenation are imaged situ on the nanoscale. The direct studies on the “nanocomposite” catalysts are correlated with parallel reaction chemistry measurements. They demonstrate high hydrogenation activity at low operating temperatures in the presence of atomic scale anion vacancy defects associated with Lewis acid sites at the nanosupport surface and an electronic and synergistic contribution to the promoter mechanism. The combined synergistic effect between the two metals and the interaction with the reduced nanosupport leading to an electronic modification lead to highly reactive site for the hydrogenation catalysis. The results illustrate novel selective hydrogenation chemistry with mesoporous nanocatalyst systems on nanosupports.