CDR reactor having multilayered catalyst layer arrangement for preventing catalyst deactivation

A CDR (carbon dioxide reaction) reactor, comprising:

• a reactor housing including a reactant gas inlet formed at a first side thereof and allowing introduction of reactant gas including methane and carbon dioxide, an outlet formed at a second side thereof and allowing discharge of unreacted gas and reaction products, and a heating means provided in a housing wall at a position between the reactant gas inlet and the outlet and heating the reactant gas inside the reactor housing;
• and
• a catalytic reaction part provided inside the reactor housing and having a structure in which CDR catalyst layers are arranged in multiple layers in a direction from the reactant gas inlet toward the outlet,
• wherein in order to prevent a temperature of the reactant gas in the reactor from decreasing to equal to or less than 750° C., while maintaining a final conversion rate of the reactant gas based on methane in a single reactor equal to or greater than 90%, the catalytic reaction part is configured such that the CDR catalyst layers are arranged in multiple layers so as to be spaced apart from each other at a predetermined interval, and a temperature restoration section having an empty space with a length equal to the predetermined interval is formed between each of the catalyst layers, wherein in the temperature restoration section, the reactant gas having a decreased temperature due to an endothermic reaction while passing through each of the catalyst layers is reheated by the heating means,
• the catalytic reaction part is configured such that, when a region in which the thicknesses of 2 catalyst layers, separated by the temperature restoration section, are equal exists, the lengths of the temperature restoration sections in that region, in the direction from the reactant gas inlet toward the outlet, are either the same or decreased, and decrease at least once,
• the catalytic reaction part is configured such that, when a region in which the lengths of 2 temperature restoration sections, separated by the catalyst layer, are equal exists, the thicknesses of the CDR catalyst layers in that region, in the direction from the reactant gas inlet toward the outlet, are either the same or increased, and increase at least once,
• each of the CDR catalyst layers is coated with a catalyst having a monolithic structure of ceramic material,
• the CDR catalyst layers include at least first, second, third, and fourth CDR catalyst layers in sequence, with the first catalyst layer being closest to the reactant gas inlet, and
• for at least the first, second, and third CDR catalyst layers, the immediately-following downstream temperature restoration section has a length that is greater than or equal to four times the thickness of the corresponding CDR catalyst layer.