Synthesis of a ceria-supported iron–ruthenium oxide catalyst and its structural transformation from subnanometer clusters to single atoms during the Fischer–Tropsch synthesis reaction

2017 ◽  
Vol 4 (12) ◽  
pp. 2059-2067 ◽  
Author(s):  
Xu Wang ◽  
Xin-Pu Fu ◽  
Wen-Zhu Yu ◽  
Chao Ma ◽  
Chun-Jiang Jia ◽  
...  
Keyword(s):  
Oxide Catalyst ◽  
Ruthenium Oxide ◽  
Tropsch Synthesis ◽  
Synthesis Reaction ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Single Atoms ◽  
X Ray Absorption ◽  
Supported Iron

The transformation from subnanometer clusters to single atoms during Fischer–Tropsch synthesis was revealed by X-ray absorption fine structure analysis of a ceria-supported iron–ruthenium oxide catalyst.

Co-Promoted Cu/ZnO Catalysts for Fischer-Tropsch Synthesis

2017 ◽  
Vol 266 ◽  
pp. 117-121
Author(s):  
Piyasak Akcaboot ◽  
Napat Kanokpornwasin ◽  
Monthida Raoarun ◽  
Patraporn Saiwattanasuk ◽  
Pinsuda Viravathana
Keyword(s):  
Tropsch Synthesis ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
Edge Structure ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Cu Foil ◽  
Co Precipitation ◽  
X Ray Absorption

Co-promoted Cu/ZnO catalysts were studied for Fischer-Tropsch synthesis (FTS). All catalysts were prepared by the co-precipitation method, having the mass ratio of Co:Cu:Zn=0 (unpromoted), 0.05, 0.5:1:1, and characterized by X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), including X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). From XRD and XAS, the results confirmed the phase transformation of CuO to Cu foil and Co3O4 to Co foil in Co-promoted catalysts after reduction. After FTS reaction testing, the Co-promoted catalysts showed the decrease in methanol selectivity of 15 and 1.6% for 0.05Co-Cu/ZnO and 0.5Co-Cu/ZnO, respectively, and the increase in C5-C15 selectivity during 30 h of reaction.

scholarly journals In situ X-Ray Absorption of Co/Mn/TiO2 Catalysts for Fischer—Tropsch Synthesis.

ChemInform ◽  
2004 ◽  
Vol 35 (50) ◽  
Author(s):  
Fernando Morales ◽  
Frank M. F. de Groot ◽  
Pieter Glatzel ◽  
Evgueni Kleimenov ◽  
Hendrik Bluhm ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
X Ray Absorption

Cu/ZnO Catalysts for Enhancing the Methanol Selectivity in Fischer-Tropsch Synthesis

2015 ◽  
Vol 659 ◽  
pp. 206-210
Author(s):  
Passakorn Kongkinka ◽  
Kittima Chatrewongwan ◽  
Patraporn Saiwattanasuk ◽  
Pinsuda Viravathana
Keyword(s):  
Structural Changes ◽  
Product Distribution ◽  
Tropsch Synthesis ◽  
Catalyst Stability ◽  
Fischer Tropsch ◽  
Edge Structure ◽  
Fischer Tropsch Synthesis ◽  
Methanol Production ◽  
X Ray ◽  
X Ray Absorption

Cu/ZnO catalysts were studied to enhance the methanol selectivity in Fischer-Tropsch synthesis (FTS). By knowing that the methanol production from syngas (CO/H2) accelerated the crystallization of Cu and ZnO and led to the deactivation of the catalysts, a small amount of iron added to the catalyst could improve the catalyst stability by suppressing the crystallization of Cu and ZnO. The promotional effects of iron on the textural properties, reduction behavior, and structural changes of the Cu-based FTS catalysts were investigated by X-ray diffraction (XRD), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). Their catalytic activity was measured at 10 bar and 190°C with H2/CO ratio of 2 and the FTS products were analyzed by GC. The product distribution was presented in terms of methanol, C1, C2-C4, and C5+ selectivity.

scholarly journals In Situ X-ray Absorption of Co/Mn/TiO2Catalysts for Fischer−Tropsch Synthesis

2004 ◽  
Vol 108 (41) ◽  
pp. 16201-16207 ◽  
Author(s):  
Fernando Morales ◽  
Frank M. F. de Groot ◽  
Pieter Glatzel ◽  
Evgueni Kleimenov ◽  
Hendrik Bluhm ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
X Ray Absorption

XAS Study on Calcination Effect of Silica Supported Cobalt Catalysts for Fischer-Tropsch Synthesis

2012 ◽  
Vol 608-609 ◽  
pp. 1413-1418
Author(s):  
Siwaruk Chotiwan ◽  
Waritsara Bungmek ◽  
Sanya Prangsri-Aroon ◽  
Pinsuda Viravathana
Keyword(s):  
Performance Testing ◽  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Edge Structure ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Supported Cobalt Catalysts ◽  
Methane Selectivity ◽  
X Ray Absorption

The precalcined and calcined silica supported cobalt catalysts at 15, 20, and 25%Co were investigated by X-ray Absorption Spectroscopy (XAS) including the X-ray absorption near edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS). The results showed the phase of Co(NO3)2.6H2O in all precalcined catalysts, which corresponded to the XRD measurement. When increasing the amount of cobalt in the precalcined catalysts, there was the presence of ordered Co(NO3)2.6H2O phase. After calcination in Ar at 600°C for 6 h, the Co3O4phase was presented in all calcined catalysts. For the catalytic performance testing, the selected 20%Co/Aerosil_wi_calcined catalyst was reduced at 450°C in H2and operated at 190°C with a total pressure of 10 bar and H2/CO flow rate of 20:10 ml/min for Fischer-Tropsch synthesis. After reaction testing, the used 20%Co/Aerosil_wi catalyst showed the main phase of Co3O4. The result showed high methane selectivity at the beginning of reaction. By increasing of reaction time, the methane selectivity tended to decrease, whereas the C2-C4and C5+selectivity was increased.

Promoted and Un-Promoted Co/SiO2 Fischer-Tropsch Catalysts

2011 ◽  
Vol 287-290 ◽  
pp. 3093-3097 ◽  
Author(s):  
Sanya Prangsri-Aroon ◽  
Pinsuda Viravathana ◽  
Waritsara Bangmek ◽  
Attera Worayingyong ◽  
Wiyong Kangwansupamonkon ◽  
...  
Keyword(s):  
Silica Surface ◽  
Tropsch Synthesis ◽  
Crystalline Size ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Adsorption Desorption ◽  
X Ray Absorption ◽  
Cobalt Species ◽  
Catalytic Performances

Un-promoted and promoted Co/SiO2 catalysts with ZrO2 and Ru were prepared and the catalytic performances for Fischer-Tropsch synthesis were investigated. The prepared catalysts were characterized by XRD, N2 adsorption/desorption, and X-ray absorption techniques. XRD suggested that the cobalt species presence in all prepared catalysts was Co3O4. Promoted catalyst with ZrO2 and Ru showed high distribution of cobalt on silica surface resulted in smaller Co3O4 crystalline size than un-promoted ones. From the reaction testing, the obtained products of C1 to C9 from un-promoted and promoted Co/SiO2 were studied.

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