Elucidating the promoting role of Ca on PdZn/CeO2 catalyst for CO2 valorization to methanol

The viability of catalyzed CO2 conversion routes strongly depends on improving the catalytic performance and understanding process. Herein, we investigate effect Ca loading PdZn/CeO2 catalysts prepared using sol–gel chelatization method for hydrogenation to methanol. A remarkable improvement in catalyst was revealed with optimum amount (0.5 wt%) synergetic cooperation PdZn alloy (main active phase methanol reaction), compared Ca-free counterpart. following key indicators are attained at 230 °C, 20 bar, 2400 h−1 GHSV optimized catalyst: 16 % conversion, > 93 selectivity, ∼ 124 g/kgcat/h space–time yield. overall observed is attributed Ce3+/Ce4+ ratio, Ca2+ promotion, surface area, pore volume, basic sites, as by various characterization techniques. Results shown here indicate that presence vicinity enhances basicity, creates oxygen vacancies, may have improved spill-over ability H2, consequently favoring activation formation.