Abstract
Catalysts of 10% Ni, supported on promoted alumina, were used to accomplish the partial oxidation of methane. The alumina support was doped with oxides of Mo, Mg, Ti and Y. An incipient wetness impregnation technique was used to synthesize the catalysts. The physicochemical properties of the catalysts were described by XRD, H2-TPR (temperature programmed reduction), BET, TGA, CO2-TPD (temperature-programmed desorption) and Raman. The characterization results denoted that Ni has a strong interaction with the support. The TGA investigation of spent catalysts displayed the anticoking enhancement of the promoters. The impact of the support promoters on the catalyst stability, methane conversion and H2 yield was inspected. Stability tests were done for 460 min. The H2 yields were 76 and 60% and the CH4 conversions were 67 and 92%, respectively, over Ni/Al2O3+Mg, when the reaction temperatures were 550 and 650 °C, respectively. The performance of the present work was compared to relevant findings in the literature.
Highlights
The depletion of fossil fuel resources despite their growing demand and utilization has posed prominent concerns
The rise in the amount of N2 adsorbed at high P/P0 in the isotherm curves is due to the phenomenon of capillary condensation within the sample pores
This work has demonstrated the performance effect of alumina support promoters used in synthesizing Ni-based catalysts for methane partial oxidation
Summary
The depletion of fossil fuel resources despite their growing demand and utilization has posed prominent concerns. Natural gas, which is mainly composed of CH4 is often converted into useful products such as synthesis gas (H2 and CO), which is versatile and beneficial in producing chemicals like methanol and ethane [3,4,5]. Many technologies exist for CH4 reforming to generating synthesis gas. Steam reforming which is used on a large scale has H2 /CO of 3, while dry reforming which has attracted the attention of many investigators due to the environmental aspects, generates synthesis gas of H2 /CO of 1 [6,7,8,9,10]. Partial oxidation of CH4 (POM) is seen to be a substitute method for both steam and dry reforming in synthesis gas production. POM draws the consideration due to its benefits, such as mild exothermicity, high efficiency, and giving an appropriate
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