A Study of the Preparation of Porous Amorphous Alloys and Their Catalysis

在非晶态合金催化的系列研究中，我们发现非晶态合金在氢化和/或脱氢反应中显示出高的转换频率。然而，该合金的表面积小，催化活性归一化到一个单位质量是显着低于传统的catalysts.In本研究中，已尝试通过采用一种技术：掺杂和浸出的锌或铝的表面积的扩大。添加金属的掺杂通过两种方式进行：1）加热锌或铝粉末与非晶态合金粉末的混合物，2）热分解吸附在合金粉末表面上的甲酸锌。第二种方法适合于制备高比表面积的多孔非晶合金。对于掺杂金属的浸出过程，稀NaOH溶液的处理被发现是合适的。制得了比表面积为7 - 9 m^2 g ^-1的多孔非晶态合金，这些合金在丁二烯加氢或甲醇脱氢制甲酸甲酯反应中表现出很高的催化活性。<-1>对多孔Cu-Ti和Cu-Zr催化剂上甲醇脱氢反应进行了详细的研究，考察了预处理和反应条件对催化剂活性和选择性的影响。

In the series of study on catalysis by amorphous metal alloys, we found that the alloys revealed high turnover frequencies in hydrogenation and/or dehydrogenation reactions. However, the surface area of the alloy is small and the catalytic activity normalized to a unit mass is substantially lower than that of conventional catalysts.In the present study, the enlargement of surface area has been attempted by adopting a technique : doping and leaching of zinc or aluminum. Doping of additional metal is performed by two manners : 1) heating a mixture of zinc or aluminum powder and an amorphous alloy powder, 2) thermal decomposition of zinc formate adsorbed on the surface of alloy powder. The second method is found to be suitable for preparation of porous amorphous alloys with high surface area. For leaching process of the doped metals, a treatment of dilute NaOH solution is found to be suitable. Thus, porous amorphous alloys th surface area of 7-9 m^2 g^<-1> were obtained.These alloys revealed high catalytic activity in hydrogenation of butadiene or dehydrogenation of methanol to methyl formate. Detailed studies on dehydroqenation of methanol by porous Cu-Ti and Cu-Zr catalysts have been carried out to investigate the effects of pretreatments and reaction conditions on the activity and selectivity.