Loaded nitrogen oxide purifying catalyst and its preparation

Abstract

The invention is load nitrogen oxide clarifying catalyst and the manufacturing method. The character lies in that: it is special for clarifying nitrogen oxide of tail gas of diesel engine and rare combustion gasoline engine which load molybdenum and copper oxide on HZSM-5. the molecular expressing formula is: Cu-Mo / ZSM-5. the invention has following advantages: (1) initiative. (2) high activity. (3) the activity temperature region is wide. (4) high stability. (5) the method is simple and the cost is low.

Description

Technical field: [0001] The present invention supports a catalyst for purifying nitrogen oxides and its preparation, which belongs to the field of heterogeneous catalysis technology and its environmental protection, and specifically relates to a catalyst for controlling air pollution, especially exhaust pollution from diesel vehicles and lean-burn gasoline locomotives, and a preparation method thereof . technical background: [0002] As we all know, motor vehicle exhaust has become the main pollution source of urban road air pollution today, so the research on motor vehicle exhaust pollution control, especially the research on catalytic conversion technology, has become a global research hotspot. At present, the three-way catalyst technology for gasoline vehicle exhaust has tended to become perfect. Of course, with the continuous improvement of motor vehicle exhaust emission standards and the need for commercialization, there are still many issues to be studied. [0003] T...

AI Technical Summary

Problems solved by technology

[0003] There are some bibliographical reports about the selective catalytic reduction research of nitrogen oxides. In the reported catalysts about the selective catalytic reduction of nitrogen oxides, there are the following problems: some are aimed at studying the reaction mechanism, the properties of the catalyst, etc. Low conversion rate, such as Pt / Al 2 o 3 , the NO conversion rate of Cu / ZSM-5 is 38%~62% and 33% (R.Burch, J.Catal., 176(1998): 204; B.Ganemi, Appl.Catal.B.17(1998) : 293); although some have higher activity, the life of the catalyst is poor

However, there are few patent reports on catalysts for purifying nitrogen oxides in exhaust gas from diesel vehicles and lean-burn gasoline vehicles in my country.

We have done some research work on the catalytic conversion of nitrogen oxides (Journal of Catalysis, 2002, 23 (6): 535; Molecular Catalysis, 2000, 14 (5): 354), and applied for a study on Fe-Mo / National invention patent of ZSM-5 catalyst, the catalyst has high catalytic conversion activity and good stability for nitrogen oxides, but the problem is that the catalytic activity is low at low temperature