Nano-hybrid catalyst for NO_xremoval

摘要

The present invention is related to the synthesis of a nano-hybrid catalyst made of carbon nanotubes and metal ferrite materials for the removal of NOx compounds, which are emitted from stationary sources, through an ammonia selective catalytic reduction process. Weight ratios of carbon nanotube (x) to metal ferrite (y) is preferably about (x/y) 0.1 to 10. The present invention is also directed to the synthesis of a nano-hybrid catalyst to improve the efficiency of the conventional NOx reduction process at lower reaction temperatures. By use of the preferred nano-hybrid catalyst, it is possible to locate a selective catalytic reduction (SCR) unit capable of operating at lower temperatures, e.g., below 260° C., and from about 50° C. to about 250° C., after the desulfurizer and the particle removal equipment. With the exhaust gas cleaner, the lifetime of the catalyst can be increased. This nano-hybrid catalyst provides higher NOx removal efficiencies at low temperatures, typically from about 50° C. to about 250° C.

主权项

1. An NOx removal catalyst comprising:
a plurality of carbon nanotubes; and a metal ferrite material, said metal ferrite material comprising primarily nanoparticles thereof dispersed onto surfaces of said plurality of carbon nanotubes; and a reducing agent, said reducing agent selected from the group consisting of propane, methane, propylene, hydrogen, urea, ammonia and combinations thereof, wherein when an NOx gas is passed over said catalyst of said plurality of carbon nanotubes with metal ferrite nanoparticles thereon, NOx molecules within said NOx gas are reduced.