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CoN_x/CNTs催化剂的比表面积可达151.85m~2/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 N_2-H_2 mixture gases.The surface composition and reaction performance were investigated by XRD,BET,H_2-TPR techniques.The results show that the CoN_x/CNTs exhibited higher surface area and optimum catalytic activity for ammonia decomposition.The BET surface area of CoN_x/CNTs could be up to 151.85m~2/g.The ammonia conversion was 80.3% at 650℃,and complete decomposition of ammonia was observed at 850℃.
参考文献
[1] | Kojima R.;Aika K. .Molybdenum nitride and carbide catalysts for ammonia synthesis[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2001(1/2):141-147. |
[2] | Kojima R;Aiak K I .[J].Chemistry Letters,2000,29(05):514. |
[3] | 罗雄军,卢春山,刘武灿,项益智,李小年.载体对负载型过渡金属氮化物催化氨分解性能的影响[J].工业催化,2006(07):60-66. |
[4] | Hada K;Nagai M;Omi S .[J].Journal of Physical Chemistry B,2001,105:4084-4093. |
[5] | Volpe L;Boudart M .[J].Solid State Chemistry,1985,59(03):332-347. |
[6] | Wise R S;Markel E J .[J].Journal of Catalysis,1994,145:344-347. |
[7] | 柳云骐,刘晨光,阙国和.合成大比表面γ-Mo2N的新方法[J].无机化学学报,1999(04):541-544. |
[8] | Liang C H;Liw Z;Wei Z B .[J].Industrial and Engineering Chemistry Research,2000,39:3694. |
[9] | Kojima R;Aika K .[J].Applied Catalysis A:General,2001,215:149. |
[10] | LU C S;LIX N;ZHU Y F et al.[J].Chinese Chemical Letters,2004,15:105. |
[11] | Li J.;Haslett TL.;Moskovits M. .Nanoscale electroless metal deposition in aligned carbon nanotubes[J].Chemistry of Materials,1998(7):1963-1967. |
[12] | Che G;Lakshmi B B;Martin C R et al.[J].Langmuir,1999,15:750. |
[13] | 邹勇,刘吉平.碳纳米管负载氧化钡催化剂的制备及性能[J].贵州化工,2004(02):1-3. |
[14] | 彭峰,姜靖雯,王红娟,冯景贤.碳纳米管负载的Fe2O3催化剂制备[J].无机化学学报,2004(02):231-235. |
[15] | 李茂刚,成荣明,徐学诚,陈奕卫,李相美.碳纳米管负载氧化铁的制备与机理[J].化学通报(印刷版),2006(01):36-40. |
[16] | 王曙光,李延辉,赵丹,赵华章,徐才录,栾兆坤,梁吉,吴德海.碳纳米管负载氧化铝材料的制备及其吸附水中氟离子的研究[J].高等学校化学学报,2003(01):95-99. |
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