分别对Al2O3和SiO2担载的不同含量铱(Ir)催化剂进行了H2程序升温还原、 CO微量吸附量热和红外研究.结果表明,还原后, Ir/Al2O3上存在金属态Ir0和氧化态Irδ+两种物种, CO在催化剂表面主要以线式和孪生吸附态存在,测量的CO吸附热为两种吸附形式的平均吸附热.提高还原温度和Ir担载量, Ir/Al2O3表面CO线式吸附物种的比例增加,从而导致CO吸附热值的升高.而在Ir/SiO2上Ir物种主要为金属态Ir0, CO吸附都以线式吸附为主,在所考察的条件下CO吸附热随Ir担载量和还原温度的变化不明显.
参考文献
[1] | Yoshinari T;Sato K;Haneda M;Kintaichi Y Hamada H .[J].Applied Catalysis B:Environmental,2003,41(1-2):157. |
[2] | Wang A Q;Ma L;Cong Y;Zhang T Liang D B .[J].Applied Catalysis B:Environmental,2003,40(04):319. |
[3] | Li L D;Zhang F X;Guan N J;Richter M Fricke R .[J].Catalysis Communications,2007,8(03):583. |
[4] | Alexeev O.;Gates BC. .Iridium clusters supported on gamma-Al2O3: Structural characterization and catalysis of toluene hydrogenation[J].Journal of Catalysis,1998(2):310-320. |
[5] | Cunha D S;Cruz G M .[J].Applied Catalysis A:General,2002,236(1-2):55. |
[6] | Zhang B C;Tang X L;Li Y;Cai W J Xu Y D Shen W J .[J].Catalysis Communications,2006,7(06):367. |
[7] | 宋伟,师瑞娟,刘俊龙,展恩胜,李占双,徐奕德,申文杰.CeO2负载的Cu,Ir和Pd催化剂上的醇转移脱氢反应[J].催化学报,2007(02):106-108. |
[8] | Escard J;Leclère C;Contour J P .[J].Journal of Catalysis,1973,29(01):31. |
[9] | Li L;Wang XD;Zhao XQ;Zheng MY;Cheng RH;Zhou LX;Zhang T .Microcalorimetric studies of the iridium catalyst for hydrazine decomposition reaction[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2005(1/2):119-124. |
[10] | 赵许群,张涛,孙孝英,关文.肼分解催化剂的表征及失活机理研究[J].催化学报,2000(06):594-596. |
[11] | Cho, SJ;Lee, J;Lee, YS;Kim, DP .Characterization of iridium catalyst for decomposition of hydrazine hydrate for hydrogen generation[J].Catalysis Letters,2006(3/4):181-187. |
[12] | 臧景龄;熊国兴.[J].催化学报,1980(11):73. |
[13] | 罗洪原;初玉芝;徐翠兰;周业慎 .[J].催化学报,1990,114:284. |
[14] | Solymosi F;Novák E;Molnár A .[J].Journal of Physical Chemistry,1990,94(18):7250. |
[15] | Carona-Martinez N;Dumesic J A .[J].Advances in Catalysis,1992,38:149. |
[16] | Auroux A .[J].Topics in Catalysis,2002,19(3-4):205. |
[17] | 沈俭一.吸附量热技术和金属氧化物催化剂的表面酸碱性[J].催化学报,2000(02):186-194. |
[18] | Spiewak B E;Dumesic J A .[J].Thermochimica Acta,1996,290(01):43. |
[19] | d'Alnoncourt RN;Xia X;Strunk J;Loffler E;Hinrichsen O;Muhler M .The influence of strongly reducing conditions on strong metal-support interactions in Cu/ZnO catalysts used for methanol synthesis[J].Physical chemistry chemical physics: PCCP,2006(13):1525-1538. |
[20] | Shen J Y;Hill J M;Watwe R M;Spiewak B E Dumesic J A .[J].Journal of Physical Chemistry B,1999,103(19):3923. |
[21] | Guerrero-Ruiz A.;Xin Q.;Maroto-Valiente A.;Benito-Gonzalez M. Rodriguez-Ramos I.;Yang SW. .Comparative study by infrared spectroscopy and microcalorimetry of the CO adsorption over supported palladium catalysts[J].Langmuir: The ACS Journal of Surfaces and Colloids,2000(21):8100-8106. |
[22] | Guil J M;Homs N;Llorca J;de la Piscina P R .[J].Journal of Physical Chemistry B,2005,109(21):10813. |
[23] | Li L;Wang X;Shen J;Zhou L;Zhang T .Study on chemisorption of H-2, O-2, CO and C2H4 on Pt-Ag/SiO2 catalysts by microcalorimetry and FTIR[J].Journal of thermal analysis and calorimetry,2005(1):103-107. |
[24] | Cheng R H;Shu Y Y;Zheng M Y;Li L Sun J Wang X D Zhang T .[J].Journal of Catalysis,2007,249(02):397. |
[25] | Zhang W S;Wang A Q;Li L;Wang X D Zhang T .[J].Catalysis Today,2008,131(1-4):457. |
[26] | 李林,王晓东,沈俭一,周立幸,张涛.高灵敏宽温区吸附热测定装置的建立[J].催化学报,2003(11):872-876. |
[27] | 王锐,刘雪斌,陈燕馨,李文钊,徐恒泳.金属-载体相互作用对CH4/CO2重整反应中Rh基催化剂抗积炭性能的影响[J].催化学报,2007(10):865-869. |
[28] | Hwang C P;Yeh C T;Zhu Q M .[J].Catalysis Today,1999,51(01):93. |
[29] | 张雄伟,储伟,王晓东,杨维慎,盛世善,张涛.氧化铝担载的贵金属铱基催化剂的制备及其对甲醇裂解反应的催化性能[J].催化学报,2006(10):863-867. |
[30] | Anderson J R.Structure of Metallic Catalysts[M].New York:Academic Press,Inc,1975:360. |
[31] | Gélin P;Auroux A;Taarit Y;Gravelle P C .[J].Applied Catalysis,1989,46(02):227. |
[32] | Alexeev O.;Gates BC.;Panjabi G. .Partially decarbonylated tetrairidium clusters on gamma-Al2O3: Structural characterization and catalysis of toluene hydrogenation[J].Journal of Catalysis,1998(1):196-209. |
[33] | Hadjiivanov K I;Vayssilov G N .[J].Advances in Catalysis,2002,47:307. |
[34] | Howe R F .[J].Journal of Catalysis,1977,50(01):196. |
[35] | Solymosi F;Raskó J .[J].Journal of Catalysis,1980,62(02):253. |
[36] | Toolenaar F J C M;Bastein A G T M;Ponec V .[J].Journal of Catalysis,1983,82(01):35. |
[37] | Bourane A;Nawdali M;Bianchi D .[J].Journal of Physical Chemistry B,2002,106(10):2665. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%