A novel Co-B amorphous alloy catalyst in the form of ultrafine particles was prepared by chemical reduction of CoCl2 with aqueous NaBH4, which exhibited excellent activity and selectivity during the hydrogenation of c...A novel Co-B amorphous alloy catalyst in the form of ultrafine particles was prepared by chemical reduction of CoCl2 with aqueous NaBH4, which exhibited excellent activity and selectivity during the hydrogenation of cinnamaldehyde to cinnamyl alcohol in liquid phase. The optimum yield of cinnamyl alcohol was 87.6%, much better than the yield of using Raney Ni, Raney Co and other Co-based catalysts.展开更多
An ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH4 in aqueous solution,which exhibited perfect selectivity to sorbitol(~100%)and very high activity during the liquid phase gluecose...An ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH4 in aqueous solution,which exhibited perfect selectivity to sorbitol(~100%)and very high activity during the liquid phase gluecose hydrogenation,much higher than the corresponding crystallized Ru-B,the pure Ru powder,and Raney Ni catalysts.The correlation of the catalytic activity to both the structural and surface electronic characteristics was discussed bricfly.展开更多
A novel heterogeneous oscillator, the Cu2+-catalyzed oscillatory oxidation of ascorbic acid (Vitamin C) in aqueous solution by O2 flow was reported. Both the potential oscillations on Pt-electrode corresponding to [Cu...A novel heterogeneous oscillator, the Cu2+-catalyzed oscillatory oxidation of ascorbic acid (Vitamin C) in aqueous solution by O2 flow was reported. Both the potential oscillations on Pt-electrode corresponding to [Cu2+] and the absorbance oscillations at (=260 nm corresponding to [ascorbic acid] were observed. Oscillations in the completely homogeneous system were also observed. Effects of several factors on the oscillations were investigated.展开更多
在这研究，热地稳定的 Ir/Ce <sub>0.9</sub 的使用 > La <sub>0.1</sub > O <sub>2</sub> 催化剂为甲烷的干燥改过被调查。做 La <sub>2</sub > 进 CeO <sub>2</sub> 格...在这研究，热地稳定的 Ir/Ce <sub>0.9</sub 的使用 > La <sub>0.1</sub > O <sub>2</sub> 催化剂为甲烷的干燥改过被调查。做 La <sub>2</sub > 进 CeO <sub>2</sub> 格子的 O <sub>3</sub> 提高了 Ir/Ce <sub>0.9</sub 的化学、物理的性质 > La <sub>0.1</sub > O <sub>2</sub> 催化剂例如氧化还原作用性质，红外分散，氧存储能力，和热稳定性，关于 Ir/CeO <sub>2</sub> 催化剂。因此， Ir/Ce <sub>0.9</sub > La <sub>0.1</sub > O <sub>2</sub> 催化剂为比 Ir/CeO <sub>2</sub> 催化剂的甲烷的干燥改过展出更高的活动和更稳定的性能。这观察能主要在 Ir/Ce <sub>0.9</sub 被归因于在金属和支持之间的更强壮的相互作用> La <sub>0.1</sub >稳定催化剂结构并且改进氧存储能力的 O <sub>2</sub>催化剂，导致红外 nanoparticles 和 Ce <sub>0.9</sub 的可以忽略的聚集> La <sub>0.1</sub >在高温度的 O <sub>2</sub>支持，以及碳的快速的移动在在红外金属和 Ce <sub>0.9</sub 之间的边界扔> La <sub>0.1</sub > O展开更多
A reaction ofα-bromo aromatic ketones in water with microwave irradiation gave the correspondingα-hydroxy aromatic ketones in good yields.The use of microwaves was found to significantly improve yields and shorten t...A reaction ofα-bromo aromatic ketones in water with microwave irradiation gave the correspondingα-hydroxy aromatic ketones in good yields.The use of microwaves was found to significantly improve yields and shorten the reaction time.This reaction afforded a very clean,convenient method for the synthesis ofα-hydroxy aromatic ketones.展开更多
基金This work was supported by the National Natural Science Foundation of China (29973025) and the Natural Science Foundation of Shanghai Science and Technology Committee (98QMA11402).
文摘A novel Co-B amorphous alloy catalyst in the form of ultrafine particles was prepared by chemical reduction of CoCl2 with aqueous NaBH4, which exhibited excellent activity and selectivity during the hydrogenation of cinnamaldehyde to cinnamyl alcohol in liquid phase. The optimum yield of cinnamyl alcohol was 87.6%, much better than the yield of using Raney Ni, Raney Co and other Co-based catalysts.
文摘An ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH4 in aqueous solution,which exhibited perfect selectivity to sorbitol(~100%)and very high activity during the liquid phase gluecose hydrogenation,much higher than the corresponding crystallized Ru-B,the pure Ru powder,and Raney Ni catalysts.The correlation of the catalytic activity to both the structural and surface electronic characteristics was discussed bricfly.
文摘A novel heterogeneous oscillator, the Cu2+-catalyzed oscillatory oxidation of ascorbic acid (Vitamin C) in aqueous solution by O2 flow was reported. Both the potential oscillations on Pt-electrode corresponding to [Cu2+] and the absorbance oscillations at (=260 nm corresponding to [ascorbic acid] were observed. Oscillations in the completely homogeneous system were also observed. Effects of several factors on the oscillations were investigated.
文摘在这研究，热地稳定的 Ir/Ce <sub>0.9</sub 的使用 > La <sub>0.1</sub > O <sub>2</sub> 催化剂为甲烷的干燥改过被调查。做 La <sub>2</sub > 进 CeO <sub>2</sub> 格子的 O <sub>3</sub> 提高了 Ir/Ce <sub>0.9</sub 的化学、物理的性质 > La <sub>0.1</sub > O <sub>2</sub> 催化剂例如氧化还原作用性质，红外分散，氧存储能力，和热稳定性，关于 Ir/CeO <sub>2</sub> 催化剂。因此， Ir/Ce <sub>0.9</sub > La <sub>0.1</sub > O <sub>2</sub> 催化剂为比 Ir/CeO <sub>2</sub> 催化剂的甲烷的干燥改过展出更高的活动和更稳定的性能。这观察能主要在 Ir/Ce <sub>0.9</sub 被归因于在金属和支持之间的更强壮的相互作用> La <sub>0.1</sub >稳定催化剂结构并且改进氧存储能力的 O <sub>2</sub>催化剂，导致红外 nanoparticles 和 Ce <sub>0.9</sub 的可以忽略的聚集> La <sub>0.1</sub >在高温度的 O <sub>2</sub>支持，以及碳的快速的移动在在红外金属和 Ce <sub>0.9</sub 之间的边界扔> La <sub>0.1</sub > O
基金financially supported by the National Special Fund for State Key Laboratory of Bioreactor Engineering(No.2060204)the National Natural Science Foundation of China(No.20672037)
文摘A reaction ofα-bromo aromatic ketones in water with microwave irradiation gave the correspondingα-hydroxy aromatic ketones in good yields.The use of microwaves was found to significantly improve yields and shorten the reaction time.This reaction afforded a very clean,convenient method for the synthesis ofα-hydroxy aromatic ketones.
