Fabrication, Shaping And De-NO_x Pilot Application Of Novel SCR Catalyst

With the development of national economy and the improvement of living standards, the deteriorating environment has attracted world wide attention. Nitrogen oxides and dioxins are the two most important pollutants. They have a great deal of harm to humans and the environment. Selective catalytic oxidation/reduction technology is the most effective kind of processing to reduce their emissions. Now, the research and development of high efficiency catalyst for low temperature SCR has been a top priority.The research team has successfully developed a low temperature SCR catalyst with independent property rights. For the studied catalysts, the CB and NOx removal efficiencies have been studied. The forming.testing and application of the catalyst also have been studied.(1) We coat Mn-Ce/Ti-CNTs catalyst prepared by sol-gel on the aluminum plates. They have displayed the outstanding performance of simultaneous removal of CB and NOX. The CB and NOX removal efficiencies are 95% or more at 250℃.(2) For the SCR catalyst prepared by sol-gel in the laboratory, the plate, honeycomb molding experiments have been conducted. When the ratio among binder, cement and sodium silicate added to the catalyst is the best, the catalyst has high mechanical strength, anti-water conditions and excellent de-NOx efficiency. Various additives are mixed to our catalyst by a certain proportion, then, we obtain the honeycomb catalyst having high mechanical strength and good SCR performance by extrusion molding.(3) For the SCR catalyst prepared by sol-gel in the laboratory, the denitrification testing and pilot application have been conducted. When the velocity of flue gas is far more than 6m/s, NOx removal efficiencies are 74%. When the velocity of flue gas is 4-6m/s, NOx removal efficiencies are 85%. We also successfully prepared a new kind of the plate catalysts. For this kind of plate catalysts, the testing of NOx removal efficiencies are under way.