▎ 摘　　要

NOVELTY - A desulfurization and denitration catalyst is obtained by mixing diatomaceous earth-graphene as carrier by particles, sintering at 150 degrees C for 3 hours, loading nano nickel oxide on the carrier, forming composite oxide active carrier and supporting metal oxide promoter as catalytic additive on active carrier. The catalyst comprises 19.41-24.45 wt.% diatomaceous earth-graphene, 57.93-65.65 wt.% nano nickel oxide, 4.09-5.77 wt.% metal oxide additive, 3.29-4.16 wt.% surfactant, 2.24-3.08 wt.% crosslinking agent and 4.28-4.96 wt.% reinforcing agent. The catalyst is used for catalyzing simultaneous removal of nitrogen oxides and sulfur oxides at less than 300 degrees C, when reacting at 160-250 degrees C with ammonia vapor as absorbent. The removal rates of catalytic nitrogen oxides and sulfur oxides are 92% and 96%, respectively. The metal oxide additive is zirconium boride. The mass ratio of diatomaceous earth with respect to graphene is 2:1. USE - Desulfurization and denitration catalyst. ADVANTAGE - The desulfurization and denitration catalyst efficiently removes nitrogen oxide and sulfur oxide at the rate of more than 96% and 92%, respectively. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of desulfurization and denitration catalyst. Diatomaceous earth-graphene, nano nickel oxide and metal oxide additives are prepared. Using sol-gel method, 85-125 pts. wt. tetrabutyl titanate is dissolved in absolute ethanol, stirred and 10-12 pts. wt. diethanolamine as inhibitor is added. The mixture is continuously stirred, and distilled water is dripped to obtain clear sol. To the obtained sol, 30-40 pts. wt. diatomaceous earth-graphene is added, stirred to load nickel oxide produced by hydrolysis of tetrabutyl titanate onto diatomaceous earth-graphene, and 6-7 pts. wt. metal oxide additive is added and stirred. The resultant mixture is then subjected to suctioning process and dried to obtain solid powder. The obtained solid powder is calcined in muffle furnace, cooled and pulverized to obtain powdery composite catalyst preliminary material in which nickel oxide is fixed on diatomaceous earth-graphene. To the obtained powdery composite catalyst starting material, a surfactant, a crosslinking agent, a reinforcing agent, and pure aqueous ammonia and deionized water are added in the ratio of 88.49-89.28:3.53-3.57:2.65-3.54:4.45-5.31. The resultant mixture is then refined, vacuumed, and aged under constant temperature and humidity condition. The obtained product is then dried and sintered to obtain desulfurization and denitration catalyst.