Monolithic macroporous Pt/CeO2/Al2O3 and zirconia modified Pt/f eO2/Al2O3 catalysts Were prepared by using concentrated emulsions synthesis route.The catalytic performances over the platinum-based catalysts were investigated by water-gas shift (WGS) reaction in a wide temperature range (180-300 ℃).The samples were characterized with thermogravimetry (TG),X-ray diffraction (XRD),scanning electron microscopy (SEM),high resolution transmission electron microscopy (HRTEM) and temperature programmed reduction (TPR) techniques as well.The SEM and HRTEM results indicated that the monoliths possessed macroporosity,in size of 5-50 μm,and platinum particles were homogeneously dispersed on macroporous materials.XRD and TPR results showed that the interaction between ceria and zirconia oxide was formed and the addition of zirconia could promote the reducibility of platinum oxide on the interface of ceria and zirconia particles,which led to an improvement of catalytic activity in WGS reaction.The results indicated that zirconia modified monolithic macroporous Pt/CeO2/Al2O3 could be fabricated in small size (from millimeter lever to centimeter) and had good reaction activity,which was a potential new route for miniaturization of the WGS reactor.
参考文献
| [1] | Isono T;Suzuki;Kaneko M;Akiyama Y Miyaki Y Yonezu I .Development of a high-performance PEFC module operated by reformed gas[J].Journal of Power Sources,2000,86:269. |
| [2] | Kawatsu S .Advanced PEFC development for fuel cell powered vehicles[J].Journal of Power Sources,1998,71:150. |
| [3] | Wolf Vielstich;Arnold Lamm;Hubert A Gasteiger.Handbook of Fuel Cell:Fundamentals,Technology and Applications[M].Wiley Press,2003 |
| [4] | Pradhan S;Satyanarayana A;Reddy R;Devi N Satyanarayana Chilukuri .Copper-based catalysts for water gas shift reaction:Influence of support on their catalytic activity[J].Catalysis Today,2009,141:72. |
| [5] | Wang X;Gorte R J;Wanger J P .Deactivation mechanisms for Pd/ceria during the water-gas-shift reaction[J].Journal of Catalysis,2002,212:225. |
| [6] | Wolfgang R;Oleg I;Robert J F .A new generation of water gas shift catalysts for fuel cell applications[J].Journal of Power Sources,2003,118:61. |
| [7] | Ahmed S;Lee Sheldon H D;Carter J D .Method for generation hydrogen for fuel cells[P].US patent 6713 040,2003. |
| [8] | Tonkovich A Y;Zilka J L;Lamont M J;Wang Y,Wegeng R S .Microchannel reactors for fuel processing applications.I.Water gas shift reactor[J].Chemical Engineering Science,1999,54(13-14):2947. |
| [9] | Gorte R J;Zhao S .Studies of the water-gas-shift reaction with ceria-supported precious metals[J].Catalysis Today,2005,104:18. |
| [10] | Fu Q;Weber A;Stephanopoulos M F .Nanostructured AuCeO2 catalysts for low-temperature water-gas shift[J].Catalysis Letters,2001,77:87. |
| [11] | Hilaire S;Wang X;Luo T;Gorte R J Wagner J .A comparative study of water-gas-shift reaction over ceria supported metallic catalysts[J].Applied Catalysis A:General,2001,215:271. |
| [12] | Fu Q.;Saltsburg H.;Flytzani-Stephanopoulos M. .Active nonmetallic Au and Pt species on ceria-based water-gas shift catalysts[J].Science,2003(5635):935-938. |
| [13] | Quiney A S;Germani G;Schuurman Y .Optimization of a water-gas shift reactor over a Pt/ceria/alumina monolith[J].Journal of Power Sources,2006,160:1163. |
| [14] | Sato T;Dosaka K;Ishitsuka M;Haga E M Okuwaki A .Sintering behaviour of ceria-doped tetragonal zirconia powders crystallized and dried using supercritical alcohols[J].Journal of Alloys and Compounds,1993,193:274. |
| [15] | Tani E;Yoshimura M;Somiya S .Revised phase diagram of the system ZrO2-CeO2 below 1400 ℃[J].Journal of the American Ceramic Society,1983,66:506. |
| [16] | Panagiotopoulou P;Christodoulakis A;Kondarides DI;Boghosian S .Particle size effects n the reducibility of titanium dioxide and its relation to the water-gas shift activity of Pt/TiO2 catalysts[J].Journal of Catalysis,2006(2):114-125. |
| [17] | Wang X;Rodriguez JA;Hanson JC;Perez M;Evans J .In situ time-resolved characterization of Au-CeO2 and AuOx-CeO2 catalysts during the water-gas shift reaction: Presence of Au and O vacancies in the active phase[J].The Journal of Chemical Physics,2005(22):21101-1-21101-5-0. |
| [18] | Andreeva D;Tabakova T;Idakiev V;Christov P Giovanoli R .Au/α-Fe2O3 catalyst for water-gas shift reaction prepared by deposition-precipitation[J].Applied Catalysis A:General,1998,169:9. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%