Abstract
Dry reforming of CH4 was conducted over promoted Ni catalysts, supported on mesoporous gamma-alumina. The Ni catalysts were promoted by various metal oxides (CuO, ZnO, Ga2O3, or Gd2O3) and were synthesized by the incipient wetness impregnation method. The influence of the promoters on the catalyst stability, coke deposition, and H2/CO mole ratio was investigated. Stability tests were carried out for 460 min. The H2 yield was 87% over 5Ni+1Gd/Al, while the CH4 and CO2 conversions were found to decrease in the following order: 5Ni+1Gd/Al > 5Ni+1Ga/Al > 5Ni+1Zn/Al > 5Ni/Al > 5Ni+1Cu/Al. The high catalytic performance of 5Ni+1Gd/Al, 5Ni+1Ga/Al, and 5Ni+1Zn/Al was found to be closely related to their contents of NiO species, which interacted moderately and strongly with the support, whereas free NiO in 5Ni+1Cu/Al made it catalytically inactive, even than 5Ni/Al. The 5Ni+1Gd/Al catalyst showed the highest CH4 conversion of 83% with H2/CO mole ratio of ~1.0.
Highlights
The combustion of paraffin hydrocarbons such as methane (CH4 ) yields water and carbon dioxide, which is one of the main contributors to global warming
Al-Fatesh [21] investigated the promotional influence of gadolinium (Gd) on Ni/Y2 O3 catalyst, employed during the production of H2 from carbon dioxide and methane
The objective of this study was to determine the optimal promoter for Ni supported on mesoporous γ-alumina catalyst to maintain great stability and activity, while minimizing the carbon deposition during the dry reforming of methane (DRM) process
Summary
The combustion of paraffin hydrocarbons such as methane (CH4 ) yields water and carbon dioxide, which is one of the main contributors to global warming. The Ni/Al2 O3 is known to deactivate due to the blockage of its active sites by carbon deposition, an issue widely reported in the literature [15,16] To tackle this problem, coke resistant mesoporous materials are used as supports [8]. Al-Fatesh [21] investigated the promotional influence of gadolinium (Gd) on Ni/Y2 O3 catalyst, employed during the production of H2 from carbon dioxide and methane. Investigated the effect of various loadings of gallium promoter of Ni supported on MCM-41 on the activity and stability for the production of syngas by DRM. The objective of this study was to determine the optimal promoter for Ni supported on mesoporous γ-alumina (meso-γ-Al2 O3 ) catalyst to maintain great stability and activity, while minimizing the carbon deposition during the DRM process. Various characterization techniques were employed to understand the catalytic performance
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