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采用硝酸铝和硝酸钴的乙醇溶液与钼酸铵的碳酸铵水溶液共沉淀制备了Al2O3负载Co-Mo双金属氧化物前驱体,结合氨程序升温还原法制得了氮化物催化剂Co-Mo-N/Al2O3.利用X射线衍射和N2物理吸附方法表征了制备的前驱体和钝化态Co-Mo-N/Al2O3催化剂的晶相和孔结构,用程序升温脱附、程序升温表面反应及扫描电子显微镜考察了共沉淀法和浸渍法制备的催化剂的晶格稳定性,活性中心和表面形貌,用氨分解反应表征了Co-Mo-N/Al2O3催化剂的活性.结果表明,焙烧温度对催化剂比表面积有较大影响,低温焙烧的样品中活性组分散性较好,673K焙烧制得催化剂的氨分解活性最高.与浸渍法制备的Co-Mo-N/Al2O3催化剂相比,共沉淀法制备的催化剂具有更高的晶格稳定性、更均匀的活性组分分布和更高的氨分解活性.

参考文献

[1] Mckay, D;Hargreaves, JSJ;Rico, JL;Rivera, JL;Sun, XL .The influence of phase and morphology of molybdenum nitrides on ammonia synthesis activity and reduction characteristics[J].Journal of Solid State Chemistry,2008(2):325-333.
[2] Kojima R;Aika K I .[J].Applied Catalysis A:General,2001,215:149.
[3] Xiang Y Z;Li X N .[J].Chinese Journal of Chemical Engineering,2005,13:696.
[4] Santillan-Vallejo L A;Melo-Banda J A;de la Torre A I R;Sandoval-Robles G,Domínguez J M,MontesinosCastellanos A,de los Reyes-Heredia J A .[J].Carol Today,2005,109:33.
[5] Nagai M.;Irisawa A.;Omi S.;Goto Y. .Catalytic activity and surface properties of nitrided molybdena-alumina for carbazole hydrodenitrogenation[J].Journal of Catalysis,2000(1):128-137.
[6] Volpe L;Boudart M .[J].Journal of Solid State Chemistry,1985,59:332.
[7] Voipe L;Boudart M .[J].Journal of Solid State Chemistry,1985,59:348.
[8] Nagai M;Goto Y;Miyata A;Kiyoshi M,Hada K,Oshikawa K,Omi S .[J].Journal of Catalysis,1999,182:292.
[9] Lee Y J;Nguyen T H;Khodakov A;Adesina A A .[J].Journal of Molecular Catalysis A:Chemical,2004,211:191.
[10] Liu Z L;Meng M;Fu Y L;Jiang M,Hu T D,Xie Y N,Liu T .[J].Materials Letters,2002,54:364.
[11] Trawczynski J .[J].Catalysis Today,2001,65:343.
[12] Nagai M;Arahata T .[J].Catalysis Today,2003,87:123.
[13] Wu ZL.;Yang SW.;Wei ZB.;Li C.;Xin Q.;Chu YJ. .Sulfur effect on Mo2N/gamma-Al2O3 catalyst studied by in situ FT-IR spectroscopy[J].Journal of Catalysis,2000(1):23-32.
[14] Nagai M;Goto Y;Ishii H;Omi S .[J].Applied Catalysis A:General,2000,192:189.
[15] Liu Y Q;Liu C G;Que G H .[J].Energy and Fuels,2002,16:531.
[16] Lu Ch Sh;Li X N;Zhu Y F;Liu H Zh,Zhou Ch H .[J].Chinese Chemical Letters,2004,15:105.
[17] 齐兴义,熊光,杨树武,辛勤.负载型钴-钼氮化物的制备及吡啶加氢脱氮活性的研究[J].高等学校化学学报,1998(10):1645-1649.
[18] 魏昭彬,赵秀阁,辛勤.双组分过渡金属氮化物催化剂Ⅰ.制备和表征[J].催化学报,2000(03):225-228.
[19] 魏昭彬,赵秀阁,辛勤.双组分过渡金属氮化物催化剂Ⅱ.催化性能[J].催化学报,2000(04):305-308.
[20] 孟明,伏义路,刘振林,姜明,谢亚宁,胡天斗.氧化铝负载高分散γ-Mo2N的制备与结构表征[J].高等学校化学学报,2002(06):1113-1116.
[21] Wei ZB.;Grange P.;Delmon B.;Xin Q. .TPD AND TPR STUDIES OF MOLYBDENUM NITRIDE[J].Journal of Catalysis,1997(2):176-182.
[22] Nagai M;Goto Y;Uchino O;Omi S .[J].Catalysis Today,1998,43:249.
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