Influence of Nature Support on Methane and CO2 Conversion in a Dry Reforming Reaction over Nickel-Supported Catalysts

Abstract

A promising method to reduce global warming has been methane reforming with CO2, as it combines two greenhouse gases to obtain useful products. In this study, Ni-supported catalysts were synthesized using the wet impregnation method to obtain 5%Ni/Al2O3(SA-5239), 5%Ni/Al2O3(SA-6175), 5%Ni/SiO2, 5%Ni/MCM41, and 5%Ni/SBA15. The catalysts were tested in dry reforming of methane at 700 °C, 1 atm, and a space velocity of 39,000 mL/gcat h, to study the interaction of Ni with the supports, and evaluation was based on CH4 and CO2 conversions. 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 gave the highest conversion of CH4 (78 and 75%, respectively) and CO2 (84 and 82%, respectively). The catalysts were characterized by some techniques. Ni phases were identified by X-ray diffraction patterns. Brunauer–Emmett–Teller analysis showed different surface areas of the catalysts with the least being 4 m2/g and the highest 668 m2/g belonging to 5%Ni/Al2O3(SA-5239) and 5%Ni/SBA15, respectively. The reduction profiles revealed weak NiO-supports interaction for 5%Ni/Al2O3(SA-5239), 5%Ni/MCM41, and 5%Ni/SBA15; while strong interaction was observed in 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2. The 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 were close with respect to performance; however, the former had a higher amount of carbon deposit, which is mostly graphitic, according to the conducted thermal analysis. Carbon deposits on 5%Ni/SiO2 were mainly atomic in nature.

Modification of CeNi0.9Zr0.1O3 Perovskite Catalyst by Partially Substituting Yttrium with Zirconia in Dry Reforming of Methane

“…CeO 2 impregnated with yttrium increases ionic conductivity with Ce and Y bonded together, suggesting the possible presence of the CeO 2 -Y 2 O 3 phase, which favors NiO dispersion and limits the sintering [ 28 ]. Y 2 O 3 as a basic carrier allows Ni catalyst to be easily reduced and have a better activity [ 29 ]. Yttrium enhances smaller nickel crystallites, thereby improving the dispersion of active sites.…”

“…Yttrium enhances smaller nickel crystallites, thereby improving the dispersion of active sites. The promotion with 0.09Y led to better activity which was linked to the formation of a solid solution of ZrO 2 -Y 2 O 3 , thereby enhancing the reduction of bulk NiO [ 29 ]. In addition, a number of oxygen vacancies and mobility can be enhanced by doping cerium with yttrium [ 39 ].…”

“…Promoters like alkali earth and alkali with rare earth metals have been used for the activity and stability enhancement of nickel-based catalysts [ 26 , 27 , 28 ]. Doping of trace amounts of noble metals to Ni catalyst leads to direct improvements of the catalytic reaction features of DRM [ 29 , 30 , 31 ].…”

Tuning the basicity of the Ni@MCM-41 catalyst via alkaline earth metal oxide promoters for CO2 reforming of CH4

“…4,14–16 It was well found that the nature of support has a great influence on the catalysts utilized in the DRM reaction. 17 El Hassan et al 18 proved high NiO nanoparticle dispersion inside SBA-15 pores through the impregnation method with two solvents. Tannous et al 19 reported the SBA-16 pore structure and its effect on catalytic activity and stability.…”

Carbon Formation during Methane Dry Reforming over Ni-Containing Ceria-Zirconia Catalysts

“…Catalytic activity and stability to carbonization depend on many factors, such as type of active metal, preparation method, nature of precursors, calcination temperature, reduction pretreatment and support nature [ 22 ]. Noble-metal catalysts provide high catalytic activity and stability to coke formation [ 23 ].…”