عنوان مقاله [English]
The use of Biogas as a feed for dry reforming of methane has many environmental and economical advantages. Despite the high activity and low cost of Ni/Al2O3 catalyst, it shows pour stability due to coke deposition and active phase sintering. In this study, the effect of the synthesis method (impregnation vs. sol-gel) was evaluated on (1) physicochemical properties, (2) activity and (3) stability of Ni/Al2O3 catalyst. Extraction of physicochemical properties of nanocatalysts by XRD, FESEM, FTIR, BET, PSD and TG-DTG showed that the sol-gel method produced amorphous phases, uniform nanoparticles´ distribution and a higher surface area in comparison with impregnation method. FTIR analysis confirmed the existence of desired functional groups and lack of spinel compounds which were in agreement with XRD analysis. PSD analysis (< 60 nm) demonstrated the promotion of Ni/Al2O3 catalyst by sol-gel method synthesis. Therefore, it can be found that preparation method had a great influence on physicochemical properties of catalyst; such as, crystallinity, surface area and morphology. The performances of catalysts were evaluated at atmospheric pressure, feed gas ratio of CO2/CH4= 1, GHSV=24 l/g.h and temperature ranges from 550 to 850°C. The stability test also was performed at °850C for 24 h. The results revealed that the synthesized catalyst by sol-gel method had better performances. The excellent syngas ratio (0.99) had been produced only by sol-gel synthesized Ni/Al2O3 nanocatalyst; besides, its activity loss was less than the nanocatalyst synthesized using impregnation method.
. Abdollahifar M., Haghighi M., Babaluo A. A. and Khajeh Talkhoncheh S., “Sono-synthesis and characterization of bimetallic Ni-Co/Al2O3-MgO nanocatalyst: effects of metal content on catalytic properties and activity for hydrogen production via CO2 reforming of CH4,” Ultrasonics Sonochemistry, Vol. 31, pp. 173-183, 2016.##
. Yahyavi S. R., Haghighi M., Shafiei S., Abdollahifar M. and Rahmani F., “Ultrasound-assisted synthesis and physicochemical characterization of Ni-Co/Al2O3-MgO nanocatalysts enhanced by different amounts of MgO used for CH4/CO2 reforming,” Energy Conversion and Management, Vol. 97, pp. 273-281, 2015.##
. Sharifi M., Haghighi M. and Abdollahifar M., “Sono-dispersion of bimetallic Ni–Co over zeolite Y used in conversion of greenhouse gases CH4/CO2 to high valued syngas,” Journal of Natural Gas Science and Engineering, Vol. 23, pp. 547-558, 2015.
. Vafaeian Y., Haghighi M. and Aghamohammadi S., “Ultrasound assisted dispersion of different amount of ni over ZSM-5 used as nanostructured catalyst for hydrogen production via CO2 reforming of methane,” Energy Conversion and Management, Vol. 76, pp. 1093-1103, 2013.##
. Sajjadi S. M., Haghighi M., Alizadeh Eslami A. and Rahmani F., “Hydrogen Production via CO2-Reforming of Methane over Cu and Co Doped Ni/Al2O3 Nanocatalyst: Impregnation vs. Sol-Gel Method and Effect of Process Conditions and Promoter," Journal of Sol-Gel Science and Technology, Vol. 67, No. 3, pp. 601-617, 2013.##
. Rahemi N., Haghighi M., Babaluo A. A., Fallah Jafari M. and Khorram S., “Conversion of CH4/CO2 to Syngas over Ni-Co/Al2O3-ZrO2 Nanocatalyst Synthesized via Plasma Assisted Co-impregnation Method: Surface Properties and Catalytic Performance," Journal of Applied Physics, Vol. 114, No. 9, pp. 094301, 2013.##
. Akpan E., Sun Y., Kumar P., Ibrahim H., Aboudheir A. and Idem R., “Kinetics, experimental and reactor modeling studies of the carbon dioxide reforming of methane (CDRM) over a new Ni/CeO2–ZrO2 catalyst in a packed bed tubular reactor,” Chemical Engineering Science, Vol. 62, No. 15, pp. 4012-4024, 2007.##
. Avraam D. G., Halkides T. I., Liguras D. K., Bereketidou O. A. and Goula M. A., “An experimental and theoretical approach for the biogas steam reforming reaction,” International Journal of Hydrogen Energy, Vol. 35, No. 18, pp. 9818-9827, 2010.
. Xu J., Zhou W., Li Z., Wang J. and Ma J., “Biogas reforming for hydrogen production over nickel and cobalt bimetallic catalysts,” International Journal of Hydrogen Energy, Vol. 34, No. 16, pp. 6646-6654, 2009.##
. Haghighi M., Sun Z. q., Wu J. h., Bromly J., Wee H. L., Ng E., Wang Y. and Zhang D. k., “On the reaction mechanism of CO2 reforming of methane over a bed of coal char,” Proceedings of the Combustion Institute, Vol. 31, No. 2, pp. 1983-1990, 2007.
. Zhang J., Wang H. and Dalai A. K., “Effects of metal content on activity and stability of Ni-Co bimetallic catalysts for CO2 reforming of CH4,” Applied Catalysis A: General, Vol. 339, No. 2, pp. 121-129, 2008.##
. Pompeo F., Nichio N. N., Souza M. M. V. M., Cesar D. V., Ferretti O. A. and Schmal M., “Study of Ni and Pt catalysts supported on α-Al2O3 and ZrO2 applied in methane reforming with CO2,” Applied Catalysis A: General, Vol. 316, No. 2, pp. 175-183, 2007.
. Ling QianYan Z., “Studies on the Adsorption and Dissociation of Methane and Carbon Dioxide on Nickel,”Journal of Natural Gas Chemistry, Vol. 11, pp. 151–158, 2002.##
. Zhang J., Wang H. and Dalai A., “Development of stable bimetallic catalysts for carbon dioxide reforming of methane,” Journal of Catalysis, Vol. 249, No. 2, pp. 300-310, 2007.##
. Abdollahifar M., Haghighi M. and Sharifi M., “Dry reforming of methane over nanostructured Co/Y catalyst for hydrogen production: effect of ultrasound irradiation and Co-loading on catalyst properties and performance,” Energy Conversion and Management, Vol. 103, pp. 1101-1112, 2015.##
. Sharifi M., Haghighi M. and Abdollahifar M., “Hydrogen production via reforming of biogas over nanostructured Ni/Y catalyst: effect of ultrasound irradiation and Ni-Content on catalyst properties and performance,” Materials Research Bulletin, Vol. 60, pp. 328-340, 2014.##
. Abdollahifar M., Haghighi M. and Babaluo A. A., “Syngas production via dry reforming of methane over Ni/Al2O3-MgO nanocatalyst synthesized using ultrasound energy,” Journal of Industrial and Engineering Chemistry, Vol. 20, No. 4, pp. 1845-1851, 2014.##
. Reshetenko T. V., Avdeeva L. B., Ismagilov Z. R., Chuvilin A. L. and Ushakov V. A., “Carbon capacious Ni-Cu-Al2O3 catalysts for high-temperature methane decomposition,” Applied Catalysis A: General, Vol. 247, No. 1, pp. 51-63, 2003.##
. Saedy S., Haghighi M. and Amirkhosrow M., “Hydrothermal synthesis and physicochemical characterization of CuO/ZnO/Al2O3 nanopowder. Part I: Effect of crystallization time,” Particuology, Vol. 10, No. 6, pp. 729-736, 2012.##
. Foo S. Y., Cheng C. K., Nguyen T. H. and Adesina A. A., “Kinetic study of methane CO2 reforming on Co–Ni/Al2O3 and Ce–Co–Ni/Al2O3 catalysts,” Catalysis Today, Vol. 164, No. 1, pp. 221-226, 2011.##
. Nagaraja B. M., Bulushev D. A., Beloshapkin S. and Ross J. R. H., “The effect of potassium on the activity and stability of Ni–MgO–ZrO2 catalysts for the dry reforming of methane to give synthesis gas,” Catalysis Today, Vol. 178, No. 1, pp. 132-136, 2011.##
. Pompeo F., Nichio N., Ferretti O. and Resasco D., “Study of Ni catalysts on different supports to obtain synthesis gas,” International Journal of Hydrogen Energy, Vol. 30, No. 13-14, pp. 1399-1405, 2005.##
. Luengnaruemitchai A. and Kaengsilalai A., “Activity of different zeolite-supported Ni catalysts for methane reforming with carbon dioxide,” Chemical Engineering Journal, Vol. 144, No. 1, pp. 96-102, 2008.##
. Damyanova S., Pawelec B., Arishtirova K. and Fierro J. L. G., “Ni-based catalysts for reforming of methane with CO2,” International Journal of Hydrogen Energy, Vol. 37, No. 21, pp. 15966-15975, 2012.##
. San Jose Alonso D., Illan-Gomez M. J. and Román-Martínez M. C., “Low metal content Co and Ni alumina supported catalysts for the CO2 reforming of methane,” International Journal of Hydrogen Energy, Vol. 38, No. 5, pp. 2230-2239, 2013.##
. Newnham J., Mantri K., Amin M. H., Tardio J. and Bhargava. S. K., “Highly stable and active Ni-mesoporous alumina catalysts for dry reforming of methane,” international journal of hydrogen energy Vol. 32, No. 2, pp. 1454–1464, 2011.##
. Hao Z., Zhu Q., Jiang Z., Hou B. and Li H., “Characterization of aerogel Ni/Al2O3 catalysts and investigation on their stability for CH4-CO2 reforming in a fluidized bed,” Fuel Processing Technology, Vol. 90, No. 1, pp. 113-121, 2009.##
. Xu L., Zhao H., Song H. and Chou L., “Ordered mesoporous alumina supported nickel based catalysts for carbon dioxide reforming of methane,” International Journal of Hydrogen Energy, Vol. 37, No. 9, pp. 7497-7511, 2012.##
. Pakhare D., Shaw C., Haynes D., Shekhawat D. and Spivey J., “Effect of reaction temperature on activity of Pt- and Ru-substituted lanthanum zirconate pyrochlores (La2Zr2O7) for dry (CO2) reforming of methane (DRM),” Journal of CO2 Utilization, Vol. 1, pp. 37-42, 2013.##
. Corma A., “Solid acid catalysts,” Current Opinion in Solid State and Materials Science, Vol. 2, No. 1, pp. 63-75, 1997.##
. Sun H., “Preparation and evaluation of Sol-Gel made Nickel catalysts for carbon dioxide reforming of methane,” M.Sc Thesis, Department of Chemical Engineering, University of Saskatchewan, 2005.##
. Rahemi N., Haghighi M., Babaluo A. A., Jafari M. F. and Estifaee P., “Synthesis and physicochemical characterizations of Ni/Al2O3-ZrO2 nanocatalyst prepared via impregnation method and treated with non-thermal plasma for CO2 reforming of CH4,” Journal of Industrial and Engineering Chemistry, Vol. 19, No. 5, pp. 1566-1576, 2013.##
. Nikoo M. K. and Amin N. A. S., “Thermodynamic analysis of carbon dioxide reforming of methane in view of solid carbon formation,” Fuel Processing Technology, Vol. 92, No. 3, pp. 678-691, 2011.##
. Dabbagh H. A. and Zamani M., “Catalytic conversion of alcohols over alumina–zirconia mixed oxides: Reactivity and selectivity,” Applied Catalysis A: General, Vol. 404, No. 1-2, pp. 141-148, 2011.##
. Abbasi Z., Haghighi M., Fatehifar E. and Saedy S., “Synthesis and physicochemical characterizations of nanostructured Pt/Al2O3-CeO2 catalysts for total oxidation of VOCs," Journal of Hazardous Materials, Vol. 186, No. 2-3, pp. 1445-54, 2011.
. Ryczkowski J., “IR spectroscopy in catalysis,” Catalysis Today, Vol. 68, No. 4, pp. 263-381, 2001.##
. Xu J., Zhou W., Wang J., Li Z. and Ma J., “Characterization and analysis of carbon deposited during the dry reforming of methane over Ni/La2O3/Al2O3 catalysts," Chinese Journal of Catalysis, Vol. 30, No. 11, pp. 1076-1084, 2009.##
. Yue Y., Zhao X., Hua W. and Gao Z., “Nanosized titania and zirconia as catalysts for hydrolysis of carbon disulfide,” Applied Catalysis B: Environmental, Vol. 46, No. 3, pp. 561-572, 2003.##
. Guo J., Lou H. and Zheng X., “The deposition of coke from methane on a Ni/MgAl2O4 catalyst,” Carbon, Vol. 45, No. 6, pp. 1314-1321, 2007.##