FIELD: separation.
SUBSTANCE: invention relates to a method for preparing NOx trap composition, comprising: (a) heating an iron-containing zeolite in the presence of an inert gas containing less than 1 vol. % oxygen and an organic compound to produce iron / zeolite calcined in a reducing atmosphere; (b) adding a palladium compound to the iron / zeolite calcined in a reducing atmosphere to form Pd-Fe / zeolite; and (c) calcining the Pd-Fe / zeolite at 400–600 °C in the presence of an oxygen-containing gas to produce NOx trap composition; wherein the organic compound is an organic polymer and / or a biopolymer. Invention also relates to NOx trap composition obtained by this method, containing 1 wt. % Pd and 1 wt. % Fe; to NOx trap, containing this composition applied to a metal or ceramic substrate for treating the exhaust gas of an internal combustion engine; an exhaust system containing the claimed NOx trap. Method for treating exhaust gas from an internal combustion engine includes contacting the exhaust gas with NOx trap at a temperature below 250 °C. Also disclosed is a cold start catalyst, comprising NOx trap and a supporting catalyst in the form of a platinum group metal containing one or more platinum group metals and one or more inorganic oxide carriers.
EFFECT: technical result is accumulation of NOx at a low temperature, that is, ensuring cold start of the engine.
16 cl, 1 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| CATALYST FOR COLD START-UP AND ITS USE IN EXHAUST SYSTEMS | 2014 |
|
RU2692809C1 |
| OXIDATION CATALYST FOR INTERNAL COMBUSTION ENGINE OPERATING ON LEAN MIXTURE | 2011 |
|
RU2577856C2 |
| THREE-WAY CATALYST AND USE THEREOF IN EXHAUST SYSTEMS | 2014 |
|
RU2670754C2 |
| EMISSION CONTROL SYSTEM WITH TWC CATALYSTS AND SCR-HCT CATALYSTS | 2015 |
|
RU2689059C2 |
| MANGANESE-CONTAINING DIESEL OXIDATION CATALYST | 2014 |
|
RU2683771C1 |
| COLD START-UP CATALYST AND ITS APPLICATION IN EXHAUST SYSTEMS | 2012 |
|
RU2612136C2 |
| COMBINING SCR WITH PNA FOR LOW-TEMPERATURE CONTROL OF EXHAUST GASES | 2015 |
|
RU2702578C2 |
| THREE-WAY CATALYST AND ITS USE IN EXHAUST SYSTEMS | 2016 |
|
RU2693482C2 |
| PASSIVE NO ADSORBER COMPRISING NOBLE METAL AND SMALL PORE MOLECULAR SIEVE | 2014 |
|
RU2675905C1 |
| COATED WITH CATALYST SUBSTRATE AND EXHAUST GASES EXHAUST SYSTEM FOR INTERNAL COMBUSTION ENGINES | 2012 |
|
RU2609796C2 |
