ect of Operation Conditions on the Catalytic Performance of the Co / Mn / TiO 2 Catalyst for Conversion of Synthesis Gas to Light (original) (raw)
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Preparation and Characterization of CoMn/TiO2 Catalysts for Production of Light Olefins
2011
A series of x(Co, Mn)/TiO 2 catalysts (x=2-12wt.%) containing 25%Co and 75%Mn were prepared by the co-impregnation method. All prepared catalysts have been tested in Fischer- Tropsch synthesis for production of C 2-C4 olefins. It was found that the catalyst containing 8wt.%(Co,Mn)/TiO 2 is an optimal catalyst for production of C 2-C4 olefins. The effect of operation conditions such as the H 2/CO molar feed ratios, temperature, Gas Hourly Space Velocity (GHSV) and total reaction pressure on the catalytic performance of optimal catalyst was investigated. Characterizations of both precursors and catalysts were carried out using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area measurement, Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC).
Applied Catalysis a General, 2006
Cobalt manganese oxides are prepared using a co-precipitation procedure and studied for the conversion of synthesis gas to light olefins. In particular, the effect of a range of preparation variables is investigated in detail. The variables investigated include the precipitate ageing time, pH and temperature of precipitation, the [Co]/[Mn] ratio of the precipitation solution and also reactor conditions such as reaction temperature and H 2 / CO molar feed ratio. The effect of different supports on the activity and selectivity of catalysts are also studied. The optimum preparation conditions are identified with respect to catalytic performance for the conversion of synthesis gas to ethylene and propylene. The results are interpreted in terms of the structure of the active catalyst. Generally it has been concluded that catalysts containing cobalt manganese mixed phases are found to be the most active.
Journal of the Iranian Chemical Society, 2007
Cobalt cerium oxides, prepared using a co-precipitation procedure, were studied as catalysts for the conversion of synthesis gas to light olefins (C 2-C 4). Specifically, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ce] of the precipitation solution, ageing time and calcination temperature. In addition, the effects of supports and promoters on the catalysts' activity and selectivity and a range of reaction temperatures using synthesis gas with different H 2 /CO molar feed ratios were investigated. The catalyst containing a molar ratio of 80% Co and 20% Ce, aged for 2 h, supported with 15 wt% SiO 2 without any promoter, at an operating temperature of 450 ºC and an H 2 /CO feed ratio of 2/1 (GHSV = 4500 h-1), performed optimally for the conversion of synthesis gas to light olefins. The characterization of both the precursors and the calcined catalysts by powder X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller specific surface area measurements and thermal analysis methods, including TGA and DSC, show that all the preparation variables influenced the catalyst precursor structure.
2007
Cobalt cerium oxides, prepared using a co-precipitation procedure, were studied as catalysts for the conversion of synthesis gas to light olefins (C2-C4). Specifically, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ce] of the precipitation solution, ageing time and calcination temperature. In addition, the effects of supports and promoters on the catalysts ’ activity and selectivity and a range of reaction temperatures using synthesis gas with different H2/CO molar feed ratios were investigated. The catalyst containing a molar ratio of 80 % Co and 20 % Ce, aged for 2 h, supported with 15 wt % SiO2 without any promoter, at an operating temperature of 450 ºC and an H2/CO feed ratio of 2/1 (GHSV = 4500 h-1), performed optimally for the conversion of synthesis gas to light olefins. The characterization of both the precursors and the calcined catalysts by powder X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller spe...
Applied Catalysis A: General, 2005
Iron cobalt oxides were prepared using co-precipitation procedure and studied for the conversion of synthesis gas to light olefins. In particular, the effect of a range of preparation variables such as the precipitate ageing time and [Fe]/[Co] molar ratio of the precipitation solution were investigated in detail. The preparation procedure and also the optimum preparation conditions were identified with respect to the catalyst activity for the hydrogenation of carbon monoxide. The results are interpreted in terms of the structure of the active catalyst and it has been generally concluded that the catalyst containing 40% Fe/60% Co -on molar basis -and aged for 2 h, is the most active catalyst for the conversion of synthesis gas to ethylene and propylene. The effect of different promoters and supports along with loadings of optimum support and promoter on the activity and selectivity of this catalyst are studied. It was found that the catalyst containing 40% Fe/60% Co/15 wt.% SiO 2 /1.5 wt.% K is an optimum modified catalyst and gave the best activity and selectivity. The activity and selectivity of all prepared catalysts have been studied in a fixed bed micro reactor in a range of reactor temperatures using synthesis gas with different H 2 /CO molar feed ratios. The lifetime of optimum catalyst for 72 h has been tested under the optimum reaction conditions and the catalyst was found to be highly stable. Characterization of both precursors and calcined catalysts by X-ray diffraction and scanning electron microscopy showed that the precipitate ageing time and also the [Fe]/[Co] ratio of the precipitation solution influenced the catalyst precursor structure and morphology. #
2012
Cobalt-based catalysts were prepared by precipitation method. This research investigated the effects of different supports cobalt loading, promoters, loading of promoters and calcination conditions on the catalytic performance of cobalt catalysts for Fisher-Tropsch synthesis (FTS). It was found that the catalyst containing 40 wt.% Co/TiO 2 promoted with 6 wt.% Zn was an optimal catalyst for the conversion of synthesis gas to hydrocarbons especially light olefins. The activity and selectivity of optimal catalyst were studied in different operational conditions. The results showed that the best operational conditions were the H 2 /CO = 2/1 molar feed ratio at 240°C and GHSV = 1100 h −1 under atmospheric pressure. Characterization of catalysts were carried out by using X-ray diffraction (XRD), thermal gravimetric analysis (TGA), hydrogen temperature program reduction (H 2-TPR), N 2 physisorption measurements such as Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) methods.
Bulletin of Chemical Reaction Engineering & Catalysis, 2018
The MgO-supported Fe-Co-Mn catalysts, prepared using co-precipitation procedure, were tested for production of light olefins via CO hydrogenation reaction. The effect of a range of drying conditions including drying temperature and drying time on the structure and catalytic performance of Fe-Co-Mn/MgO catalyst for Fischer-Tropsch synthesis was investigated in a fixed bed micro-reactor under the same operational conditions of T = 350 °C, P = 1 bar, H2/CO = 2/1, and GHSV = 4500 h-1. It was found that the catalyst dried at 120 °C for 16 h has shown the best catalytic performance for CO hydrogenation. Furthermore, the effect of drying conditions on different surface reaction rates was also investigated and it was found that the precursors drying conditions influenced the rates of different surface reactions. Characterization of catalyst precursors and calcined samples (fresh and used) was carried out using powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Disper...
Journal of Natural Gas Science and Engineering, 2011
Cobalt nickel oxide catalysts, prepared using co-precipitation procedure, were studied for the conversion of synthesis gas to light olefins. Specially, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ni], pH, temperature and ageing time of the precipitation solution and finally, calcination conditions such as calcination temperature and calcination time. The catalyst containing a molar ratio of 80% Co and 20% Ni, aged for 150 min, precipitated at 50 C and pH of 8.3 and calcined at 550 C for 10 h performed optimally for the conversion of synthesis gas to light olefins. Characterization of both precursors and calcined catalysts was carried out using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area measurements and thermal analysis methods including Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC).
Effect of forming on selectivity and attrition of co-precipitated Co–Mn Fischer–Tropsch catalysts
Powder Technology, 2010
Cobalt-manganese catalyst is widely studied in Fischer-Tropsch synthesis to obtain light olefins from synthesis gas. However, selectivity and mechanical strength of the catalyst differ depending on its preparation method and type of reactor. The main objective of this paper is to develop a better understanding of manufacturing parameters affecting attrition strength and selectivity of the catalyst. The cobalt-manganese oxide nano-catalysts were prepared using co-precipitation method. The fine powders were then formed using tabletting-crushing (pelletizing) process to obtain the catalyst pellets. The original unformed and formed catalysts were explored for the conversion of synthesis gas to the light olefins in a standard laboratory fixed bed reactor considering selectivity to ethylene and propylene. The processing variables investigated were included of type and concentration of binder and compression pressure in pelletizing process. Furthermore, the attrition assessment of catalyst was carried out using a rotary bottle shake system. The results presented in this work revealed that forming the catalyst under 75 bar compression pressure and 4 wt.% Syton binder led to the maximum selectivity. In the attrition evaluation, it was found that the extent of attrition was the least at the same forming conditions (75 bar, 4 wt.% Syton).