Abstract
The stability and catalytic activity of mesoporous Ni/MCM-41 promoted with a Ga loading of (0.0, 1.0, 1.5, 2.0, 2.5, and 3.0 wt %) as an innovative catalyst was examined for syngas production via CO2 reforming of CH4. The objective of present work was to develop a potential catalyst for CO2 reforming of methane. For this purpose different loadings of gallium were used to promote 5% nickel catalyst supported on MCM-41. An incipient wetness impregnation method was used for preparing the catalysts and investigated at 800 °C. Physicochemical characterization techniques—including BET, XRD, TPD, TPR, TEM, and TGA—were used to characterize the catalysts. The addition of small amounts of Ga resulted in higher surface areas with a maximum surface area of 1036 m2/g for 2.5% Ga. The incorporation of Ga to the catalyst decreased the medium and strong basic sites and reduced the amount of carbon deposited. There was no weight loss for 3%Ga+5%Ni/MCM-41. The 2% Ga loading showed the highest CH4 conversion of 88.2% and optimum stability, with an activity loss of only 1.58%. The Ga promoter raised the H2/CO ratio from 0.9 to unity.
Highlights
Carbon dioxide is a greenhouse gas that contributes to more than 90% of the global greenhouse gas emissions
The modification by small amounts of Ga resulted in higher surface areas with a maximum surface area of 1036 m2 /g for 2.5% Ga; as the loading increased to 3%, the surface area slightly decreased
A plausible explanation for the effect of the promoter Ga relates to the fact that small amounts Ga increases the dispersion of the active metals of the catalyst
Summary
Carbon dioxide is a greenhouse gas that contributes to more than 90% of the global greenhouse gas emissions. Increased greenhouse gas emissions increase global temperatures and change wind patterns [1]. Amongst the chemical transformation methods, dry reforming of methane (DRM), where methane and CO2 are used as the feedstock to produce synthesis gas, is a very promising technology for environmental protection and energy production [2]. It produces H2 /CO, which is one of the main building blocks of chemical and petrochemical products, in a ratio of unity
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