Regenerated denitration catalyst and method for manufacturing the same, and denitration apparatus

A method for manufacturing a regenerated denitration catalyst for a denitration reaction, the method comprising:

• using a mixed powder obtained by mixing a spent denitration catalyst powder comprising a first titanium oxide as a main component, and a second titanium oxide, and vanadium or a vanadium compound,
• the spent denitration catalyst powder being obtained by grinding a spent denitration catalyst of honeycomb structure,
• the spent denitration catalyst already being used in a denitration reaction in which nitrogen oxides in a gas are decomposed into nitrogen and water using a reducing agent, and
• the second titanium oxide having a larger specific surface area per unit weight than the first titanium oxide,
• the method further comprising:
• applying a kneaded mixture of the mixed powder and a solvent on a plate-like substrate and manufacturing a plate-like regenerated denitration catalyst not having honeycomb structure,
• wherein a content of vanadium or the vanadium compound is more than 0% by weight and 4% by weight or less based on a total weight of the regenerated denitration catalyst.