Method for reducing NOx emission of ceramic gas tunnel kiln

The invention relates to the field of ceramic gas tunnel kilns, in particular to a method for reducing NOx emission of a ceramic gas tunnel kiln, which is used for solving the problems that the emission limit of NOx emitted by the existing ceramic gas tunnel kiln is too large and serious environmental pollution is caused, and utilizes an emission reduction lining coating to degrade NOx, and the emission reduction lining coating contains a large amount of rare earth oxide materials, so that the emission reduction lining coating is environment-friendly. A plurality of oxygen vacancies are formed on the surface of the composite rare earth oxide functional material in a high-temperature environment, a large amount of NO in flue gas is adsorbed by the oxygen vacancies, so that an N-O bond is quickly broken, the NO is directly decomposed into N2 and O2, CO generated due to insufficient combustion of a tunnel kiln and NOx are subjected to an oxidation-reduction reaction in the manganese-cerium-containing activated c