FIELD: chemistry.
SUBSTANCE: group of inventions relates to chemical industry. Method comprises catalytic oxidation of NH3 with oxygen in reactor to produce process gas containing NOx. Process gas for decomposition of N2O is passed through a first catalyst layer. In an absorption column NOx interacts with absorbent to form a residual gas containing NOx and N2O. In residual gas content of N2O is > 100 parts per million by volume, and molar ratio N2O/NOx > 0.25. NH3 is added to residual gas and passed through second catalyst layer. At outlet concentration of NOx is < 40 parts per million by volume. Second catalyst layer comprises at least one iron-containing zeolite catalyst. Pressure, temperature and volume rate is selected so that concentration of N2O is < 200 parts per million.
EFFECT: high degree of decomposition of N2O and NOx with elimination of ammonia in waste gas flow.
22 cl, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD AND DEVICE FOR REMOVAL OF NO AND NO | 2011 |
|
RU2585642C2 |
| METHOD FOR REMOVING NITROGEN OXIDES FROM GAS USING ZEOLITE CATALYST SUBJECTED TO ION EXCHANGE WITH IRON | 2017 |
|
RU2755022C2 |
| METHOD AND THE DEVICE FOR REDUCTION OF THE CONTENTS OF NITROGEN OXIDES IN THE GASES | 2003 |
|
RU2318581C2 |
| METHOD OF REMOVING NO AND NO FROM NITRIC ACID PRODUCTION RESIDUAL GAS | 2001 |
|
RU2259227C2 |
| METHOD FOR REMOVING NITROGEN OXIDES FROM GAS | 2020 |
|
RU2809651C2 |
| METHOD OF REMOVING NITROGEN OXIDES | 2003 |
|
RU2320400C2 |
| REMOVING LAUGHING GAS IN MANUFACTURE OF NITRIC ACID | 2001 |
|
RU2237010C2 |
| CATALYST FOR TREATING NON-STATIONARY NO EMISSIONS | 2010 |
|
RU2582341C2 |
| CATALYSTS FOR TREATING NON-STATIONARY NO EMISSIONS | 2012 |
|
RU2586685C2 |
| METHOD OF PRODUCTION AND ACTIVATION OF POLY-METALLIC ZEOLITE CATALYSTS, COMPOSITION AND APPLICATION OF CATALYST FOR DECOMPOSITION OF NO | 2002 |
|
RU2297278C2 |
