Upgradation of methane in the biogas by hydrogenation of CO₂ in a prototype reactor with double pass operation over optimized Ni-Ce/Al-MCM-41 catalyst.

In addition, the final weight gain of samples shows an increasing trend of 0.85, 2.09, and 2.11% for the samples collected from top, middle, and bottom position, respectively, corresponding to the different amount of carbon deposition as confirmed by Raman analyses (Fig. 14 ).

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