# US 2015/0144037 A1 · NANO-HYBRID CATALYST FOR NOx REMOVAL > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144037 A1 - Document ID: US20150144037A1 - Status: Published application - Kind: A1 - Application number: 14/489,594 - Filed: 2014-09-18 - Published: 2015-05-28 - Earliest claimed: 2013-09-23 - Assignees: Research Institute of Petroleum Industry (RIPI); Tarbiat Modaress University - Applicants: Research Institute of Petroleum Industry (RIPI); Tarbiat Modaress University - Inventors: Mahnaz Pourkhalil; Alimorad Rashidi; Abdolsammad Zarringhalam Moghaddam; Mahdi Mohajeri; Ali Mehri - Web page: https://patentgrep.com/patent/US20150144037A1 ## CPC - B01J 23/755: Nickel - B01D 53/8628: {Processes characterised by a specific catalyst} - B01J 21/185: {Carbon nanotubes (carbon nanotubes per se C01B32/15)} - B01J 23/74: Iron group metals - B01J 37/035: {Precipitation on carriers} - B01J 37/036: {to form a gel or a cogel} - B01J 37/086: {Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid} - F23J 15/02: of purifiers, e.g. for removing noxious material (traps for solid residues F23J3/04) - B01D 2255/20753: Nickel - B01D 2255/702: Carbon - B01D 2255/9202: Linear dimensions - B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy - F23J 2215/10: Nitrogen; Compounds thereof - F23J 2219/10: Catalytic reduction devices - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06) ## Abstract 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. ## Claims ### Claim 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, 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. ### Claim 2 (depends on 1) The NOx removal catalyst according to claim 1, wherein said carbon nanotubes are selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, and combinations thereof. ### Claim 3 (depends on 1) The NOx removal catalyst according to claim 1, wherein the metal in said metal ferrite material is a metal is selected from the transition metals of the Periodic Table of Elements. ### Claim 4 (depends on 1) The NOx removal catalyst according to claim 1, wherein the metal in said metal ferrite material is selected from the group consisting of nickel, zinc, cobalt, manganese and combinations thereof. ### Claim 5 (depends on 1) The NOx removal catalyst according to claim 1, wherein the metal in said metal ferrite material is nickel. ### Claim 6 (depends on 1) The NOx removal catalyst according to claim 1, wherein said metal ferrite material comprises a weight percentage of the catalyst ranging from 10% to 70%. ### Claim 7 (depends on 1) The NOx removal catalyst according to claim 1, wherein the weight ratio of said carbon nanotubes to metal ferrite is about 0.1 to about 30. ### Claim 8 (depends on 7) The NOx removal catalyst according to claim 7, wherein the weight ratio of said carbon nanotubes to metal ferrite is about 0.1 to about 10. ### Claim 9 (depends on 1) The NOx removal catalyst according to claim 1, wherein said passage of NOx gas over said catalyst is done at temperatures ranging from about 28° C. to about 260° C. ### Claim 10 (depends on 9) The NOx removal catalyst according to claim 9, wherein said passage of NOx gas over said catalyst is done at temperatures ranging from about 50° C. to about 250° C. ### Claim 11 (depends on 1) The NOx removal catalyst according to claim 1, wherein said passage of NOx gas over said catalyst is done at temperatures ranging from about 50° C. to about 80° C. ### Claim 12 (depends on 1) The NOx removal catalyst according to claim 1, wherein said passage of NOx gas over said catalyst is done at temperatures less than about 260° C. ### Claim 13 (depends on 1) The NOx removal catalyst according to claim 1, wherein the reduction of said NOx gas over said catalyst is greater than 99% efficient. ### Claim 14 (depends on 1) The NOx removal catalyst according to claim 1, wherein the reduction of said NOx gas over said catalyst is about 100% efficient. ### Claim 15 (depends on 1) The NOx removal catalyst according to claim 1, further comprising: a reducing agent, said reducing agent selected from the group consisting of propane, methane, propylene, hydrogen, urea, ammonia and combinations thereof. ### Claim 16 A plant comprising: a furnace, said furnace producing NOx gases in a chamber thereof; an NOx reduction chamber, said NOx reduction chamber connected to an exhaust connection downstream of said furnace and having an NOx removal catalyst therein, wherein said NOx gases pass over said NOx removal catalyst and are reduced thereby at about 100% efficiency, wherein said NOx gases from said furnace chamber travel away from said furnace chamber to said NOx reduction chamber and decrease in temperature, when entering said NOx reduction chamber said NOx gases are decreased in temperature below about 260° C. ### Claim 17 (depends on 16) The plant according to claim 16, wherein said NOx gases are reduced in temperature to temperatures ranging from about 28° C. to about 260° C. ### Claim 18 (depends on 16) The plant according to claim 16, wherein said passage of NOx gas over said catalyst is done at temperatures ranging from about 50° C. to about 250° C. ### Claim 19 (depends on 16) The plant according to claim 16, wherein said passage of NOx gas over said catalyst is done at temperatures ranging from about 50° C. to about 80° C. ### Claim 20 (depends on 16) The plant according to claim 16, wherein said plant further comprises: a desulfurizer, said desulfurizer being connected to an exhaust connection from said furnace, said NOx reduction chamber being connected to an exhaust connection from said desulfurizer. ### Claim 21 (depends on 16) The plant according to claim 16, wherein said plant further comprises: a particle remover, said particle remover being connected to an exhaust connection from said furnace said NOx reduction chamber being connected to an exhaust connection from said particle remover. ### Claim 22 (depends on 16) The plant according to claim 16, wherein said furnace is an incinerator.