Selective catalytic oxidation of NH3 in gasification gas. 1

Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas

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

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

Original languageEnglish
Pages (from-to)30 - 38
Number of pages9
JournalEnergy & Fuels
Volume11
Issue number1
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Catalytic oxidation
Gasification
Iron
Gases
Silicon carbide
Catalysts
Quartz
Porous silicon
Silicon Dioxide
Oxides
Furnaces
Silica
Oxidation
dolomite
Experiments
Temperature
silicon carbide

Keywords

  • gasification

Cite this

@article{ce719a778d694df3a79c1e58ecb3cd87,
title = "Selective catalytic oxidation of NH3 in gasification gas. 1: Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas",
abstract = "Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.",
keywords = "gasification",
author = "Jukka Lepp{\"a}lahti and Tiina Koljonen and Mikko Hupa and Pia Kilpinen",
year = "1997",
doi = "10.1021/ef950265c",
language = "English",
volume = "11",
pages = "30 -- 38",
journal = "Energy & Fuels",
issn = "0887-0624",
publisher = "American Chemical Society",
number = "1",

}

Selective catalytic oxidation of NH3 in gasification gas. 1 : Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas. / Leppälahti, Jukka (Corresponding Author); Koljonen, Tiina; Hupa, Mikko; Kilpinen, Pia.

In: Energy & Fuels, Vol. 11, No. 1, 1997, p. 30 - 38.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Selective catalytic oxidation of NH3 in gasification gas. 1

T2 - Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas

AU - Leppälahti, Jukka

AU - Koljonen, Tiina

AU - Hupa, Mikko

AU - Kilpinen, Pia

PY - 1997

Y1 - 1997

N2 - Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

AB - Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

KW - gasification

U2 - 10.1021/ef950265c

DO - 10.1021/ef950265c

M3 - Article

VL - 11

SP - 30

EP - 38

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 1

ER -