Effect of nickel on combustion synthesized copper/ <scp> fumed‐SiO ₂ </scp> catalyst for selective reduction of <scp> CO ₂ </scp> to <scp>CO</scp>

In this study, we explore the effect of nickel incorporation in Cu/fumed-SiO2 catalyst for CO2 reduction reaction. Two catalysts, Cu and CuNi supported on fumed silica were synthesized using a novel surface restricted combustion synthesis technique, where reaction takes place inert fumed-SiO2 support. An active solution consisting known amount metal nitrate precursors urea (fuel) was impregnated silica. The loading limited to 1 wt% ensure localized combustions by restricting energy density. catalysts tested hydrogenation tubular packed bed reactor between temperature 50°C 650°C, Cu/SiO2 showed high conversion carbon monoxide, addition Ni further improved catalytic performance some tendency methane formation along with CO. Moreover, both highly stable under conditions did not show any sign deactivation ~42 hours time stream (TOS). characterized X-ray diffractometer (XRD), scanning electron microscope/energy dispersive spectrometer (SEM/EDX), transmission microscope (TEM), Brunauer-Emmet-Teller (BET) area measurement technique understand their structural properties assess situ DRIFTS also used investigate pathway followed catalysts.