钴镍双金属催化剂的制备及氨分解制氢性能研究

Preparation of Co-Ni Based Hydroxide Catalysts and Study on Ammonia Decomposition Catalytic Performance

采用水热法制备Co(OH)2、Ni(OH)2及不同比例Co-Ni基纳米片,经高温热解后获得Co-Ni双金属纳米催化剂。以氨分解制氢为模型反应,并结合X射线物相分析、扫描电镜以及红外等考察Co-Ni双金属催化剂的结构-性能关系。结果表明,双金属催化剂的氨解性能随着Co含量的提高而提高;基于Co(OH)2的纳米片的钴基催化剂活性最高,在873K下的氨分解转化率为98.2%,活化能Ea为40.68kJ/mol。

Bimetallic Co-Ni based alloy catalysts derived from Co-Ni based hydroxide nanosheet with different proportions of Co-Ni were prepared by hydrothermal method and further thermal treatment.The relationship between catalyst structure and catalytic activity for ammonia decomposition to hydrogen was characterized with the help of X-ray diffraction(XRD),scanning electronic microscope(SEM)and infrared spectroscopy(FT-IR).The result suggested that catalytic activity for ammonia decomposition increased with the increase of Co content in the alloyed catalyst.The monimetllic Co catalyst derived from Co(OH)2 nanosheet yielded the highest catalytic activity and the conversion of ammonia reached 98.2%at 873 K and 6000 mL/g·h.At current reaction condition,apparent activation energy was 40.68 kJ/mol according to Arrhenius s equation.