Oxidative Steam Reforming of Methane over Ni Catalysts Modified with Noble Metals

Abstract

The effects of addition of small amounts of noble metals such as Pt, Pd, and Rh to Ni/γ-Al2O3 and NiO _ MgO solid solutions were investigated on the catalyst activation, catalyst bed temperature profi le, and carbon formation behavior in oxidative steam reforming of methane. Addition of Pt and Pd by a sequential impregnation method to Ni/γ-Al2O3 had a much more remarkable effect than by a co-impregnation method on the resistance to deactivation by oxidation of Ni and suppression of hot-spot formation. Temperature-programmed reduction, extended X-ray absorption fine structure, and Fourier transform infrared spectroscopy suggested that the noble metal atoms introduced by the sequential impregnation method were preferably located on the surface to form an alloy. Addition of noble metals (Pt, Pd, and Rh) to Ni0.2Mg0.8O solid solution catalysts inhibited carbon formation in the oxidative steam reforming of methane under pressurized conditions.

Ni-based bimetallic heterogeneous catalysts for energy and environmental applications

“…The modification of Ni catalysts with noble metals was reviewed in some early reviews and it has been demonstrated as a promising approach to design catalysts with excellent performances in methane reforming. 6,9,102,103 We will mainly focus on the fundamental role of noble metals in altering the catalytic and coke resistance properties of bimetallic Ni systems.…”

Ni-Based Catalysts for Low Temperature Methane Steam Reforming: Recent Results on Ni-Au and Comparison with Other Bi-Metallic Systems

“…Production of synthesis gas from natural gas and Fisher-Tropsch synthesis from the synthesis gas have become very important in the chemical industry for reasons related to the soaring petroleum price, depletion of oil reserves, and environmental problems with exhaust gases [1][2][3]. Steam reforming of methane and other hydrocarbons has been an extremely important process for the production of synthesis gas [4][5][6].…”

“…Although Ni is inferior to noble metals regarding the resistance to carbon deposition and catalyst oxidation, the high resistance to coke formation and catalyst oxidation can be realized by the addition of very small amounts of noble metals. The modification of Ni catalysts with small amounts of noble metals such as Pd, Pt, Ru, Rh and Ir has been well reviewed [1][2][3] and it has been demonstrated as a promising approach to design catalysts with excellent performances for methane reforming.…”

High catalytic activity of Co-Fe/α-Al2O3 in the steam reforming of toluene in the presence of hydrogen

“…1. There have been some reasons of the catalyst deactivation, and one reason is the coke deposition [6,65,66]. However, from TG analysis in air atmosphere, the amount of the deposited coke was determined to be less than 0.01 mmol g −1 -cat (<0.01% C-based yield) on the catalyst after the reaction in Fig.…”