391734 Ni Catalysts with Different Promoters Supported on Zeolite for Dry Reforming of Methane
Ni catalysts with different promoters supported on zeolite for dry reforming of methane
Raja AL Otaibi1, Feraih Alenazey1, Faisal Alotaibi1, Ahmed S. Al-Fatesh2, Anis H. Fakeeha 2
1 P.O. Box 6086 Riyadh 11442, King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia
2 King Saud University , Riyadh, KSA
Corresponding author: firstname.lastname@example.org
Dry (CO2) reforming of methane (DRM) is a well-studied reaction that is of both scientific and industrial importance. It combines CH4, the main component of natural gasused as source of energy, and CO2, a major challenging greenhouse gas, where by an impact can be made to limit global warming. This reaction produces syngas that can be used to produce a wide range of products, such as higher alkanes and oxygenates by means of Fischer–Tropsch synthesis. The reaction is particularly interesting because both CH4and CO2 are available feedstocks due to their natural abundance. Therefore it is a good alternative to steam reforming , which is generally used for synthetic gas (CO/H2) production in the industry because it yields lower H2/CO ratios. DRM is considered a high endothermic reaction and requires operating temperatures of 700–1000 °C to achieve high equilibrium conversion of CH4 and CO2 to H2 and CO. The most widely used catalysts for DRM are based on Ni. However, many of these catalysts undergo severe deactivation due to carbon deposition. Noble metals have also been investigated and are usually found to be more resistant to carbon deposition than Ni catalysts, but are generally uneconomical. In this investigation, we aim to study the effect of lanthanum and calcium as promoters for Ni catalyst supported on two different zeolite for dry reforming of methane. Several catalysts of promoted Ni/ on Y-Zeolite have been prepared by impregnation method. The physicochemical properties of the prepared catalysts were characterized with (XRD), (SEM), (TEM) (BET) and XRF. These catalyst were tested for dry reforming of methane in a micro tubular reactor using temperature ranges of 700 °C at atmospheric pressure using total flow rate = 40 ml/min (CH4 =15 ml/min , CO2 =15 ml/min & N2 = 10 ml/min). It was found that, Ca –Ni/Zeolite (CBV300 ) gave the highest conversion (51%) with the average selectivity of hydrogen (47%). Ni/Zeolite showed very low conversion due to rapid deactivation of catalyst compared to La –Ni/Zeolite and Ca –Ni/Zeolite which present the enhancement of the promoters to the Ni/Zeolite .