Catalytic methanation reaction over alumina supported cobalt oxide doped noble metal oxides for the purification of simulated natural gas
Catalytic methanation reaction over alumina supported cobalt oxide doped noble metal oxides for the purification of simulated natural gas
-
摘要: A series of alumina supported cobalt oxide based catalysts doped with noble metals such as ruthenium and platinum were prepared by wet impregnation method. The variables studied were difference ratio and calcination temperatures. Pt/Co(10:90)/Al2O3 catalyst calcined at 700℃ was found to be the best catalyst which able to convert 70.10% of CO2 into methane with 47% of CH4 formation at maximum temperature studied of 400℃. X-ray diffraction analysis showed that this catalyst possessed the active site Co3O4 in face-centered cubic and PtO2 in the orthorhombic phase with Al2O3 existed in the cubic phase. According to the FESEM micrographs, both fresh and spent Pt/Co(10:90)/Al2O3 catalysts displayed small particle size with undefined shape. Nitrogen Adsorption analysis showed that 5.50% reduction of the total surface area for the spent Pt/Co(10:90)/Al2O3 catalyst. Meanwhile, Energy Dispersive X-ray analysis (EDX) indicated that Co and Pt were reduced by 0.74% and 0.14% respectively on the spent Pt/Co(10:90)/Al2O3catalyst. Characterization using FT-IR and TGA-DTA analysis revealed the existence of residual nitrate and hydroxyl compounds on the Pt/Co(10:90)/Al2O3 catalyst.
-
关键词:
- natural gas /
- cobalt oxide /
- noble metal /
- catalyst /
- methanation reaction
Abstract: A series of alumina supported cobalt oxide based catalysts doped with noble metals such as ruthenium and platinum were prepared by wet impregnation method. The variables studied were difference ratio and calcination temperatures. Pt/Co(10:90)/Al2O3 catalyst calcined at 700℃ was found to be the best catalyst which able to convert 70.10% of CO2 into methane with 47% of CH4 formation at maximum temperature studied of 400℃. X-ray diffraction analysis showed that this catalyst possessed the active site Co3O4 in face-centered cubic and PtO2 in the orthorhombic phase with Al2O3 existed in the cubic phase. According to the FESEM micrographs, both fresh and spent Pt/Co(10:90)/Al2O3 catalysts displayed small particle size with undefined shape. Nitrogen Adsorption analysis showed that 5.50% reduction of the total surface area for the spent Pt/Co(10:90)/Al2O3 catalyst. Meanwhile, Energy Dispersive X-ray analysis (EDX) indicated that Co and Pt were reduced by 0.74% and 0.14% respectively on the spent Pt/Co(10:90)/Al2O3catalyst. Characterization using FT-IR and TGA-DTA analysis revealed the existence of residual nitrate and hydroxyl compounds on the Pt/Co(10:90)/Al2O3 catalyst.-
Key words:
- natural gas /
- cobalt oxide /
- noble metal /
- catalyst /
- methanation reaction
-
PROFETI L P R, TICIANELLI E A, ASSAF E M. Co/Al2O3 catalysts promoted with noble metal for production of hydrogen by methane steam reforming[J]. Fuel, 2008, 87(10/11): 2076-2081. GARCIA P, ESTHELA RAMOS R, del ANGEL G, NAVARRETE J, CONTRERAS C A. Catalytic of supported cobalt catalyst in the crotonaldehyde hydrogenation reaction[J]. Adv Technol Mater Mater Process J, 2007, 9(1): 69-76. BIANCHI C L. TPR and XPS investigation of Co/Al2O3 catalysts promoted with Ru, Ir, and Pt[J]. Catal Lett, 2001, 76(3/4): 155-159. FINCH J N, RIPLEY D L. Method for methanation: US, 3988334[P]. 1976-10-26. MOHAMAD NASIR J, WAN ABU BAKAR W A, OTHMAN M Y. A supported titanium based catalyst for in-situ hydrogen sulphide desulphurization and carbon dioxide methanation reaction in natural gas[J]. Solid State Sci Technol, 2007, 15(2): 161-166. RYNKOWSKI J M, PARCYCZAK T, LEWICKI A, SZYNKOWSKA M I, MANIECKI T P, JOZWIAK W K. Characterization of Ru/CeO2/Al2O3 catalyst and their performance in CO2 methanation[J]. React Kinet Catal Lett, 2000, 71(1): 55-64. BURAKORN T, PANPRANOT J, MEKASUWANDUMROG O, CHAISUK C, PRASERTHDAM P, JONGSOMJIT B. Characterization of cobalt dispersed on the mixed nanoscale alumina and zirconia supports[J]. J Mater Process Technol, 2008, 206(1/3): 352-358. SIANI A, WIGAL K R, ALEXEEV O S, AMIRIDIS M D. Synthesis and characterization of [WTBZ]γ[WTB1]-Al2O3 supported Pt catalysts from Pt4 and Pt6 clusters formed in aqueous solutions[J]. J Catal, 2008, 257(1): 16-22. BUANG N A, WAN ABU BAKAR W A, MOHD MARSIN F, RAZALI M H. CO2/H2 methanation on nickel oxide based catalyst doped with various elements for the purification of natural gas[J]. The Malaysian J Anal Sci, 2008, 12(1): 217-223. RICHARDSON J T, TWIGG M V. Reduction of impregnation NiO/α-Al2O3- association of Al3+ ions with NiO[J]. Appl Catal A, 1998, 167(1): 57-64. LAMBER R, SCHULZ-EKLOFF G. Characterization of microstructures in nickel alumina catalysts by analytical electron microscopy[J]. Surf Sci, 1991, 258(1/3): 107-118. WAN ABU BAKAR W A, OTHMAN M Y, ALI R, YONG C K. Nickel oxide based supported catalysts for the in-situ reactions of methanation and desulphurization in the removal of sour gases from simulated natural gas[J]. Catal Lett, 2009, 128(1/2): 127-136. PANAGIOTOPOULOU P, KONDARIDES D I. Effect of morphological characteristics of TiO2 supported noble metal catalysts on their activity for the water-gas shift reaction[J]. J Catal, 2004, 225(2): 327-336. HUSSAIN A, SAIYUDI N K, MAJID Z. Introduction to surface and colloid chemistry[M]. Johor: Universiti Teknologi Malaysia, 2008: 49-54. TANG S, LIN J, TAN K L. Partial oxidation of methane to synthesis gas over-Al2O3 supported bimetallic Pt-Co catalysts[J]. Catal Lett, 1999, 59(2/4): 129-135. WACHS I E. Raman and IR studies of surface metal oxide species on oxide supports: Supported metal oxide catalysts[J]. Catal Today, 1996, 27(3/4): 437-455. -
点击查看大图
计量
- 文章访问数: 2038
- HTML全文浏览量: 11
- PDF下载量: 687
- 被引次数: 0
下载:
