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RISS 인기검색어
- 검색키워드
- 저자 : Ahmed Sadeq Al-Fatesh (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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The Effect of Sc Promoter on the Performance of Co/TiO2–P25 Catalyst in Dry Reforming of Methane
Ahmed Sadeq Al-Fatesh,Muhammad Awais Naeem,Anis Hamza Fakeeha,Ahmed Elhag Abasaeed 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
In the present work, the effect of scandium (Sc) promoter on the performance of Co/TiO2–P25 catalyst in dry reforming of methane has been investigated. The catalysts were prepared by the incipient wet impregnation technique. For each catalyst, the Co loading was fixed at 5 wt %, while the Sc loading was varied from 0.0 to 2.0 wt %. The experiments were carried out at atmospheric pressure in a micro tubular reactor at a temperature of 700 °C. For better understanding and comparison, the catalysts were characterized by various techniques such as Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), H2-temperature-programmed reduction (TPR), CO2-temperature-programmed desorption (TPD), and thermogravimetric analyses (TGA). The results revealed that the promotion of Co/TiO2–P25 catalyst with Sc has a significant impact on its catalytic performance and the amount of carbon deposition. The doping of Co/TiO2–P25 catalyst with Sc improves the basicity and enhances the metal support interaction in the catalyst. At higher Sc loading, Co metal oxidation became substantial that triggered severe catalyst deactivation. Amongst all Sc-promoted catalysts, 0.75 wt % Sc-promoted catalyst exhibited the highest CH4 and CO2 activity with minimum deactivation.
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A Study on Mono and Mixed Nano-supported Co-based Catalysts for Dry Reforming of Methane
Ahmed Sadeq Al-Fatesh 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.2
Effect of calcination temperature on Co-based catalysts was studied in order to evaluate the modifications in structural and catalytic properties for catalytic reforming of CH4 with CO2 . In this regard, two sets of mono (i.e., CeO2 and ZrO2 ) and mixed nano-supported (i.e., CeO2–ZrO2 ) cobalt-based catalysts, calcined at two different temperatures (500 and 900 °C), were prepared. To evaluate the catalytic activity of the prepared catalysts, CO2–CH4 reforming reaction was performed in a micro tubular reactor under atmospheric conditions (1 atm) and at different reaction temperatures ranging from 450 to 800 °C. For stability evaluation, the time on stream experiments, under similar reaction conditions, was conducted at 700 °C for 9 h. Furthermore, for selected catalysts the effect of reactants feed ratio (CO2 /CH4 ) and gas space velocity (GSV) were also studied. Various techniques such as N2 adsorption–desorption isotherm, temperature-programmed reduction (TPR), temperature-programmed desorption (TPD), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were used to characterize the prepared catalysts. It was found that the use of a specific calcination temperature in the pretreatment step had a strong influence on catalytic activity, stability, and amount of carbon deposition over catalyst surface in the dry reforming of methane. Additionally, the study revealed that the catalysts calcined at 500 °C had better activity and stability than those calcined at 900 °C.
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Syngas production via CO2 reforming of methane using Co-Sr-Al catalyst
Anis Hamza Fakeeha,Ahmed Sadeq Al-Fatesh,Muhammad Awais Naeem,Wasim Ullah Khan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The effect of addition of strontium in Co based catalysts during CO2 reforming of methane wasinvestigated in the temperature range 500–700℃. The Co/γ-Al2O3 supported catalysts with strontiumas a promoter (0–2.25 wt%) were prepared by incipient wet impregnation method. Numeroustechniques such as N2 adsorption–desorption isotherm, H2 temperature-programmed reduction (TPR),temperature-programmed desorption (TPD), X-ray diffraction (XRD), thermogravimetric analysis (TGA),Transmission Electron Microscopy (TEM), pulse chemisorption and temperature-programmed oxidation(TPO) were applied for characterization of fresh and spent catalysts. The results of characterizations andcatalyst activity test revealed that introduction of Sr in Co/γ-Al2O3 catalyst had significant effect onstability and coke suppression. The Sr addition improves the metal–support interaction as well asenhances the Lewis basicity of the catalyst. The improvement in basicity helps the chemisorption anddissociation of CO2 over the catalyst which in turn reduces carbon deposition.
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