【摘要】 分别以硼氨配合物和硼氢化钠为还原剂合成了核壳结构的Cu@CoW三元合金催化剂和非核壳结构的CuCoW三元合金催化剂,25℃下,Cu0.4@Co0.5W0.1三元合金催化剂对于硼氨配合物水解反应的TOF(转换频率)值达到0.369 0 molH2·molcat-1·s-1,明显高于非核壳结构的Cu0.4Co0.5W0.1催化剂,接近Pt、Pd等贵金属的催化活性,反应的活化能为49 kJ·mol-1。与非核壳结构的CuCoW合金相比,核壳结构的Cu@CoW三元合金催化剂的催化性能及稳定性均有明显提高。更多还原

【Abstract】 The core/shell structured Cu@CoW and non-crystalline CuCoW alloy were synthesized under mild conditions with NH3BH3(AB) and NaBH4 as reductant respectively. The catalytic properties were studied on the hydrolysis of AB aqueous solution. The TOF(turn over frequency) of Cu0.4@Co0.5W0.1catalyst for AB hydrolysis reaction at 25 ℃ reached 0.369 0 molH2·molcat-1·s-1, which was much higher than Cu0.4Co0.5W0.1and close to the noble-metal based catalysts, such as Pt, Pd, etc. The activation energy of this catalyst was 49 kJ·mol-1. Compared with the non-core/shell structured CuCoW alloy, the Cu@CoW catalyst showed apparent improvements in activity,stability and reusability. The Cu@CoW catalysts with low cost, easy preparation and simply being recovered are suitable for practical application.更多还原