碳纳米管负载金属氮化物催化剂的制备及其性能研究

Study on preparation and catalytic performance of transition metals nitrides over carbon nanotube

采用等体积浸渍法结合程序升温还原技术制备出一系列负载型过渡金属氮化物催化剂。利用XRD、BET、TPR等表征手段,结合氨分解制氢反应,研究了它们的表面性质和反应性能。发现改性碳纳米管负载的氮化钴催化剂具有较大的比表面积,对氨分解制氢反应的催化活性最高。新鲜态CoNx/CNTs催化剂的比表面积可达151.85m2/g,在650℃时氨转化率为80.3%,850℃达到完全转化。

Several transition metals nitrides over carbon nanotube were synthesized through impreganation methods and temperature-programmed reaction in N2-H2 mixture gases.The surface composition and reaction performance were investigated by XRD,BET,H2-TPR techniques.The results show that the CoNx/CNTs exhibited higher surface area and optimum catalytic activity for ammonia decomposition.The BET surface area of CoNx/CNTs could be up to 151.85m2/g.The ammonia conversion was 80.3% at 650℃,and complete decomposition of ammonia was observed at 850℃.