Fig. 8

Influence of temperature on CO₂ methanation over gradient-coated spiral-structured Ni/CeO₂ catalysts in a single-passed reactor at 200-500°C, CO₂/H₂ = ¼ (100 ml/min), WHSV = 20,000 ml/g·h, as following (a) CO₂ conversion, (b) Product selectivity, (c) Carbon balance, and (d) Temperature profile.