Mixed perovskite oxides with CaxLa1-xNi0.3Al0.7O3-d and SrxLa1-xNi0.3Al0.7O3-d(x=0,0.2,0.5,0.8,and 1.0;d=0.5x)components have been prepared by a sol-gel method.The effects of the partial substitution of La by Ca and Sr in dry CH4 reforming were investigated at 500-800℃ and 101 kPa.The resulting oxides were examined by Fourier-transform infrared spectroscopy,X-ray diffraction,temperature-programmed reduction,scanning electron microscopy,energy dispersive X-ray spectrometry,and BET surface area analysis.Studies following the catalytic tests by carbon analysis show some carbon deposition on this catalytic system.The results indicate that all initial salt entered into a propionate structure,and that most of the solid solution has well defined perovskite structure with surface areas between 3.5 and 9.5 m2/g.Most of the catalysts performed well in the dry re-forming,with CH4 conversions up to 90%,H2 yields up to 80%,and H2 selectivity up to 90%.Among the samples,Sr0.2La0.8Ni0.3Al0.7O2.9 showed an excellent catalytic performance in CH4 dry reforming,with a H2/CO ratio of 1,whereas Ca0.8La0.2Ni0.3Al0.7O2.6 showed the lowest coke formation(approximately 0.71%).
参考文献
| [1] | Gallego GS;Mondragon F;Barrault J;Tatibouet JM;Batiot-Dupeyrat C .CO2 reforming of CH4 over La-Ni based perovskite precursors[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2006(0):164-171. |
| [2] | Parvary M;Jazayeri S H;Taeb A;Petit C KiennemannA .[J].Catalysis Communications,2001,2(11-12):357. |
| [3] | Goldwasser M R;Rivas M E;Pietri E;Perez-Zurita M J Cubeiro M L Gingembre L LecIercq L LecIereq G .[J].Applied Catalysis A:General,2003,255(01):45. |
| [4] | Goldwasser MR;Rivas ME;Pietri E;Perez-Zurita MJ;Cubeiro ML;Grivobal-Constant A;Leclercq G .Perovskites as catalysts precursors: synthesis and characterization[J].Journal of molecular catalysis, A. Chemical,2005(1/2):325-331. |
| [5] | Bradford MCJ.;Vannice MA. .CO2 reforming of CH4 over supported Pt catalysts[J].Journal of Catalysis,1998(1):157-171. |
| [6] | Frusteri F;Arena F;Calogero G;Torre T .[J].Catalysis Communications,2001,2(02):49. |
| [7] | Miao Q;Xiong G;Sheng S .[J].Applied Catalysis A:General,1997,154(1-2):17. |
| [8] | Slagtern A;Olsbye U;Biom R .[J].Applied Catalysis A:General,1996,145(1-2):375. |
| [9] | Blom R;Dahl I M;Slagtem A;Sortland B Spjelkavik A Tangstad E .[J].Catalysis Today,1994,21(2-3):535. |
| [10] | Cheng Z;Wu Q;Li J;Zhu Q M .[J].Catalysis Today,1996,30(1-3):147. |
| [11] | Provendier H;Petit C;Estournes C;Libs S Kiennemann A .[J].Applied Catalysis A:General,1999,180(1-2):163. |
| [12] | Bernardo C A;Alstrup I;Rostrup-Nielsen J R .[J].Journal of Catalysis,1985,96(02):517. |
| [13] | Alstrup I;Tavares M T .[J].Journal of Catalysis,1993,139(02):513. |
| [14] | Provendier H;Petit C;Kiennemann A .[J].Comptes Rendus De L'academie Des Sciences Serie Iic:Chemie,2001,4(01):57. |
| [15] | Valderrama G;Goldwasser M R;de Navarro C U;Tatibouet J M Barrauh J Batiot-Dupeyrat C Martinez F .[J].Catalysis Today,2005,107-108:785. |
| [16] | Choudhary VR.;Belhekar AA.;Uphade BS. .OXIDATIVE CONVERSION OF METHANE TO SYNGAS OVER LANIO3 PEROVSKITE WITH OR WITHOUT SIMULTANEOUS STEAM AND CO2 REFORMING REACTIONS - INFLUENCE OF PARTIAL SUBSTITUTION OF LA AND NI[J].Journal of Catalysis,1996(2):312-318. |
| [17] | Bevy L P.Catalysis Research at the Cutting Edge[M].New York:Nova Science Publisher,2005:165. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%