High Catalytic Activity and Low Coke Formation of Ni/Y_xCe_yRu_zO₄ Catalysts in the Methane Reforming Process in a Microstructure Reactor

Abstract

The performance of spinel Y x Ce y Ru z O 4 (x = 1.5, y = 0.84, and z = 0.04) as the catalyst support in dry and steam reforming of methane (DMR/SMR) in a monolithic microreactor has been investigated. Ni/Y x Ce y Ru z O 4 catalysts have been compared with Ni/Ce−Y−Ru−Al 2 O 3 and Ni/Al 2 O 3 catalysts in the reactor test in terms of catalyst activity and stability under identical conditions. The structural features of the catalyst including surface area, morphology, and crystalline structure have been investigated using BET, XRD, XPS, TEM, FE-SEM, EDX, ICP, TPR, TGA, and TPD analyses. Y x Ce y Ru z O 4 shows that a good dispersion of the active nickel metal on the catalyst support will result in higher efficiency and activity, low temperature reduction, higher active BET surface area, and higher pore volume. The catalytic activity for SMR and DMR reactions is in the order Ni/Y x Ce y Ru z O 4 > Ni/Ce−Y−Ru−Al 2 O 3 > Ni/Al 2 O 3 . The highest methane conversion (93%) in addition to very low coke formation is obtained using Ni/Y x Ce y Ru z O 4 , which is a significant achievement in comparison to previous DMR and SMR catalysts.

Production of Valuable Aromatics from the Hydrodeoxygenation of Guaiacol and Real Bio-Oil over Ni–Nb/HZSM-5 under Supercritical Ethanol

“…Additionally, a large surface area enables more efficient adsorption and desorption of reactant molecules, thereby enhancing selectivity by facilitating the proper orientation and positioning of molecules on the catalyst surface. Moreover, the total pore volume of a catalyst influences its capacity to accommodate reactant molecules within its porous structure …”

“…Moreover, the total pore volume of a catalyst influences its capacity to accommodate reactant molecules within its porous structure. 40 3 This activation facilitates the cleavage of O−C bonds and promotes the conversion of guaiacol into deoxygenated products, such as phenol, cyclohexane, and other hydrocarbons. Moreover, a higher density of intermediate acid sites can enhance the rate of oxygen removal, promoting higher conversion of guaiacol into target hydrocarbons.…”