investigating the influence of operating conditions on the combined steam and carbon dioxide reforming of methane performance in the presence of ni/zro2 catalyst

In the present study, ni/zro2 catalyst was synthesized via a co-precipitation approach, and its catalytic activity was evaluated in combined steam and carbon dioxide reforming of methane (cscrm) reaction at a temperature range of 773 k–1273 k, co2:h2o ratio of 0.5-3 and (co2 + h2o)/ch4 ratio of 0.5-3. the results demonstrated that the higher (co2+h2o)/ch4 ratio and temperature were required for ch4 conversion of about 100%. the effect of co2/h2o ratio was little on the co and h2 yield. a (co2+h2o)/ch4 ratio of 1.5 associated with co2/h2o ratio of 0.5 at the minimum temperature of 1073 k was the required reaction condition for the synthesis gas (syngas) formation with h2/co ratio of about 2. the temperature, type, and amount of the oxidizing agent greatly affected the amount of coke deposition. the least temperature of 1073 k and (co2+h2o)/ch4 ratio higher than 1.5 irrespective of co2:h2o ratio was obtained as proper operation conditions to avoid coke formation.moreover, co2 revealed a higher portion than h2o in coke formation in cscrm reaction.