Selective catalytic oxidation of NH3 in gasification gas. 2: Oxidation on aluminum oxides and aluminum silicates

Jukka Leppälahti (Corresponding Author), Tiina Koljonen, Mikko Hupa, Pia Kilpinen

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

Original languageEnglish
Pages (from-to)39 - 45
Number of pages7
JournalEnergy & Fuels
Volume11
Issue number1
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Aluminum Silicates
Aluminum Oxide
Catalytic oxidation
Gasification
Silicates
Gases
Aluminum
Oxidation
Oxides
Temperature
Bentonite
Catalysts
Clay minerals
Acids

Keywords

  • gasification

Cite this

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title = "Selective catalytic oxidation of NH3 in gasification gas. 2: Oxidation on aluminum oxides and aluminum silicates",
abstract = "In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95{\%} NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60{\%} NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.",
keywords = "gasification",
author = "Jukka Lepp{\"a}lahti and Tiina Koljonen and Mikko Hupa and Pia Kilpinen",
year = "1997",
doi = "10.1021/ef9502665",
language = "English",
volume = "11",
pages = "39 -- 45",
journal = "Energy & Fuels",
issn = "0887-0624",
publisher = "American Chemical Society ACS",
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}

Selective catalytic oxidation of NH3 in gasification gas. 2 : Oxidation on aluminum oxides and aluminum silicates. / Leppälahti, Jukka (Corresponding Author); Koljonen, Tiina; Hupa, Mikko; Kilpinen, Pia.

In: Energy & Fuels, Vol. 11, No. 1, 1997, p. 39 - 45.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Selective catalytic oxidation of NH3 in gasification gas. 2

T2 - Oxidation on aluminum oxides and aluminum silicates

AU - Leppälahti, Jukka

AU - Koljonen, Tiina

AU - Hupa, Mikko

AU - Kilpinen, Pia

PY - 1997

Y1 - 1997

N2 - In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

AB - In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

KW - gasification

U2 - 10.1021/ef9502665

DO - 10.1021/ef9502665

M3 - Article

VL - 11

SP - 39

EP - 45

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 1

ER -