采用浸渍法制备了介孔Al2O3 (M-Al2O3)负载PdO催化剂,考察了其催化CH4燃烧反应性能.结果表明,以M-Al2O3为载体的PdO催化剂活性比普通Al2O3载体高得多,这很可能与M-Al2O3的孔道结构对PdO物种的限域作用有关.随着PdO/M-Al2O3催化剂焙烧温度的升高,甲烷催化燃烧活性先增加后降低,其中700℃焙烧的催化剂活性最高,400℃反应时CH4转化率为91%.此时Pd物种主要以PdO颗粒形式高度分散在载体的介孔孔道内,而高温焙烧时,Pd物种主要以Pd和PdO的混合晶相存在.尽管900℃焙烧制得的催化剂上CH4的转化率降低,但TOF值最大,这可能与该催化剂中同时存在金属Pd和PdO有关.
参考文献
[1] | Marchetti L;Forni L .[J].Applied Catalysis B:Environmental,1998,15:179. |
[2] | Shi, LM;Chu, W;Qu, FF;Luo, SH .Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method[J].Catalysis Letters,2007(1/2):59-64. |
[3] | Qu F F;Chu W;Shi L M;Chen M H Hu J Y .[J].Chinese Chemical Letters,2007,18:993. |
[4] | Ciuparu D;Lyubovsky M R;Altman E;Pfefferle L D Datyeet A K .[J].Catalysis Review:Science and Engineering,2002,44:591. |
[5] | Gelin P;Primet M .[J].Applied Catalysis B:Environmental,2002,39:1. |
[6] | Mowery D L;McCormick R L .[J].Applied Catalysis B:Environmental,2001,34:287. |
[7] | Mowery D L;Grabosky M S;Ohno T R;McCormick R L .[J].Applied Catalysis B:Environmental,1999,21:157. |
[8] | Persson K;Pfefferle LD;Schwartz W;Ersson A;Jaras SG .Stability of palladium-based catalysts during catalytic combustion of methane: The influence of water[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(3/4):242-250. |
[9] | Arosio F;Colussi S;Groppi G;Trovatelli A .[J].Catalysis Today,2006,117:569. |
[10] | 訾学红,戴洪兴,何洪.天然气催化燃烧催化剂的研究(Ⅰ)[J].工业催化,2008(04):43-48. |
[11] | Farrauto R J;Lampert J K;Hobson M C;Waterman E M .[J].Applied Catalysis B:Environmental,1995,6:263. |
[12] | Rodriguez N M;Oh S G;Dalla-Betta R A;Baker R T K .[J].Journal of Catalysis,1995,157:676. |
[13] | Diaz E;Ordonez S;Vega A;Coca J .[J].Microporous and Mesoporous Materials,2004,70:109. |
[14] | Farrauto R J;Hobson M C;Kennelly T;Waterman E M .[J].Applied Catalysis A:General,1992,81:227. |
[15] | Widjaja H;Sekizawa K;Eguchi K;Arai H .[J].Catalysis Today,1999,47:95. |
[16] | Bai P;Wu P P;Yan Z F;Zhao X S .[J].Journal of Materials Chemistry,2009,19:1554. |
[17] | Morajkar P P;Fernandes J B .[J].Catalyst Communication,2010,11:414. |
[18] | Yin D H;Qin L S;Liu H F;Li C Y Jin Y .[J].Journal of Molecular Catalysis A:Chemical,2005,240:4048. |
[19] | Joliet V;Chambon F;Rataboul F;Cabiac A Pinel C Guillon E Essayien N .[J].Green Chemistry,2009,11:2052. |
[20] | Yuan Q;Yin AX;Luo C;Sun LD;Zhang YW;Duan WT;Liu HC;Yan CH .Facile synthesis for ordered mesoporous gamma-aluminas with high thermal stability[J].Journal of the American Chemical Society,2008(11):3465-3472. |
[21] | Stathopouos V N;Belessi V C;Ladavos A K .[J].Reaction Kinetics and Catalysis Letters,2001,72:49. |
[22] | Kim P;Kim Y G;Kim H;Song I K Yi J .[J].Journal of Molecular Catalysis A:Chemical,2004,219:87. |
[23] | Luan Z H;Martin H;Zhao D Y;Zhou W Z Kevan L .[J].Chemistry of Materials,1999,11:1621. |
[24] | Ivanova A S;Slavinskaya E M;Gulyaev R V;Zaikovskii V I Stonkus O A Danilova I G Plyasova L M Polukhina I A Boronin A I .[J].Applied Catalysis B:Environmental,2010,97:57. |
[25] | Schmitz P J;Otto K;de Vries J E .[J].Applied Catalysis A:General,1992,92:59. |
[26] | Otto K;Hubbard C P;Weber W H;Graham G W .[J].Applied Catalysis B:Environmental,1992,1:317. |
[27] | Sales E A;Jove J;Mendes M J;Bozon-Verduraz F .[J].Journal of Catalysis,2000,195:88. |
[28] | Ozkan U S;Kumthekar M W;Karakas G .[J].Catalysis Today,1998,40:3. |
[29] | McCaulley J A .[J].Journal of Physical Chemistry,1993,97:10372. |
[30] | Ferrer V;Moronta A;Sanchez J;Sánchez J Solano R Bernal S Finol D .[J].Catalysis Today,2005,107-108:487. |
[31] | Fernández M B;Sánchez M J F;Tone G M;Damiani D E .[J].Chemical Engineering Journal,2009,155:941. |
[32] | Hicks R F;Qi H H;Young M L;Lee R G .[J].Journal of Catalysis,1990,122:280. |
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%