用原位红外光谱法研究NiB和NiP非晶态合金的还原和苯加氢反应过程

 用化学还原法制备了NiB和NiP非晶态合金催化剂，并用XRD，DSC，SEM和TEM鉴定了样品的非晶性，用ICP测定了样品的组成．在脉冲微反－色谱装置上考察了这两种催化剂催化苯加氢反应的活性．采用在线漫反射傅里叶变换红外光谱研究了这两种催化剂的还原及苯加氢反应过程．结果表明，所制备的NiB和NiP合金均为非晶态，且都是纳米尺度．NiB的粒度要比NiP小，晶化温度也比NiP低，表明Ni与B之间同Ni与P之间的相互作用不同．对苯加氢反应，NiB非晶态合金具有更大的优势，原位红外光谱结果证实催化剂的活性中心与还原态镍有关．

Study of Reduction and Benzene Hydrogenation on NiB and NiP Amorphous Alloy Catalysts by in-Situ IR Spectroscopy

The ultrafine NiB and NiP amorphous alloy catalysts were prepared by chemical reduction. The amorphous structure of the as-prepared samples was determined by XRD. SEM and TEM were used to observe the surface structure and particle size of the samples. The results showed that the particles of the catalysts are in nanometer size range. The crystallization processes were characterized in N 2 flow by DSC and it showed that NiB has lower stability than NiP owing to the difference of the interaction between Ni and B and that between Ni and P. The composition of the samples was Ni 69 B 31 and Ni 76 P 24 respectively. The catalytic performances of amorphous NiB and NiP catalysts for benzene hydrogenation were measured on a pulse microreactor-gas chromatography apparatus, and the catalytic activity of NiB was far higher than that of NiP. The processes of reduction and benzene hydrogenation on NiB and NiP were studied by using in-situ FT-IR diffuse reflectance spectroscopy. The results are in accord with the conclusion of the pulse benzene hydrogenation.