Preparation, Characterization, and Activity of Pd/PSS-Modified Membranes in the Low Temperature Dry Reforming of Methane with and without Addition of Extra Steam

The external surface of a commercial porous stainless steel (PSS) was modified by either oxidation in air at varying temperatures (600, 700, and 800 °C) or coating with different oxides (SiO2, Al2O3, and ZrO2). Among them, PSS-ZrO2 appears as the most suitable carrier for the synthesis of the Pd membrane. A composite Pd membrane supported on the PSS-ZrO2 substrate was prepared by the electroless plating deposition method. Supported Ru catalysts were first evaluated for the low-temperature methane dry reforming (DRM) reaction in a continuous flow reactor (CR). Ru/ZrO2-La2O3 catalyst was found to be active and stable, so it was used in a membrane reactor (MR), which enhances the methane conversions above the equilibrium values. The influence of adding H2O to the feed of DRM was investigated over a Ru/ZrO2-La2O3 catalyst in the MR. Activity results are compared with those measured in a CR. The addition of H2O into the feed favors other reactions such as Water-Gas Shift (RWGS) and Steam Reforming (SR), which occur together with DRM, resulting in a dramatic decrease of CO2 conversion and CO production, but a marked increase of H2 yield.

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Reaction Kinetics of Catalytic Dry Reforming of Methane on Spinel-Derived Nickel Catalyst at Low-Temperature Using an in-Situ Stagnation-Flow Reactor

ECS Meeting Abstracts ◽

10.1149/ma2020-02683621mtgabs ◽

2020 ◽

Vol MA2020-02 (68) ◽

pp. 3621-3621

Author(s):

Yonggyun Bae ◽

Jongsup Hong

Keyword(s):

Low Temperature ◽

Reaction Kinetics ◽

Nickel Catalyst ◽

Flow Reactor ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Stagnation Flow ◽

Kinetics Of

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Role of Mixed Oxides in Hydrogen Production through the Dry Reforming of Methane over Nickel Catalysts Supported on Modified γ-Al2O3

Processes ◽

10.3390/pr9010157 ◽

2021 ◽

Vol 9 (1) ◽

pp. 157

Author(s):

Ahmed Sadeq Al-Fatesh ◽

Mayankkumar Lakshmanbhai Chaudhary ◽

Anis Hamza Fakeeha ◽

Ahmed Aidid Ibrahim ◽

Fahad Al-Mubaddel ◽

...

Keyword(s):

Mixed Oxides ◽

Nickel Catalysts ◽

H2 Production ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Incipient Wetness Impregnation ◽

Thermally Stable ◽

Oxide Systems ◽

Catalyst Systems ◽

H2 Yield

H2 production through dry reforming of methane (DRM) is a hot topic amidst growing environmental and atom-economy concerns. Loading Ni-based reducible mixed oxide systems onto a thermally stable support is a reliable approach for obtaining catalysts of good dispersion and high stability. Herein, NiO was dispersed over MOx-modified-γ-Al2O3 (M = Ti, Mo, Si, or W; x = 2 or 3) through incipient wetness impregnation followed by calcination. The obtained catalyst systems were characterized by infrared, ultraviolet–visible, and X-ray photoelectron spectroscopies, and H2 temperature-programmed reduction. The mentioned synthetic procedure afforded the proper nucleation of different NiO-containing mixed oxides and/or interacting-NiO species. With different modifiers, the interaction of NiO with the γ-Al2O3 support was found to change, the Ni2+ environment was reformed exclusively, and the tendency of NiO species to undergo reduction was modified greatly. Catalyst systems 5Ni3MAl (M = Si, W) comprised a variety of species, whereby NiO interacted with the modifier and the support (e.g., NiSiO3, NiAl2O4, and NiWO3). These two catalyst systems displayed equal efficiency, >70% H2 yield at 800 °C, and were thermally stable for up to 420 min on stream. 5Ni3SiAl catalyst regained nearly all its activity during regeneration for up to two cycles.

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