Abstract: In the production of refinery catalysts, the exhaust gas often contains pollutants such as dust and nitrogen oxides. It is necessary to use appropriate technology to clean the exhaust gas and meet the more strict emission requirements. Through the comparison of dust removal and denitration technologies, the combination of cloud-dedusting technology and low temperature oxidative denitration technology is used to deeply remove dust and nitrogen oxides from the tail gas in the production process and reduce their concentrations to 20 mg/m3 and 100 mg/m3, respectively, and meet the special emission limit requirements of the "Petrochemical Industry Pollutant Emission Standards" (GB 31571-2015).

Key words: catalyst, purification of exhaust gas, cloud-dedusting, oxidative denitration