Selective catalytic oxidation of NH3 in gasification gas: 3. Experiments at elevated pressure

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

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

In this study the ability of aluminum oxide to catalyze the selective oxidation of NH3 in hot pressurized (20 bar) synthetic gasification gas was examined. When the mixture of NO and O2 was used as oxidizer, it was found that part of the NO may be converted to NO2 in the gas feeding system. It was found that the ratio of NO/NO2 in the oxidizer mixture can be controlled by controlling the residence time and the temperature of the gas feeding system. Increasing the pressure increased the rate of NO2 formation.
When the oxidizer consisted of NO2 and O2, large NH3 conversion was attained below 500 °C. With NO and O2 addition into the hot gasification gas the highest NH3 conversion took place at 550 °C. The addition of O2 alone to the aluminum oxide bed at high pressure reduced also the NH3 content of the gas. It was shown that aluminum oxide catalyzes the reaction between NH3 and O2.
Original languageEnglish
Pages (from-to)758-766
JournalEnergy & Fuels
Volume12
Issue number4
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

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Catalytic oxidation
Gasification
Gases
Aluminum Oxide
Aluminum
Experiments
Oxides
Oxidation
Temperature

Keywords

  • gasification

Cite this

Leppälahti, Jukka ; Kilpinen, Pia ; Hupa, Mikko. / Selective catalytic oxidation of NH3 in gasification gas : 3. Experiments at elevated pressure. In: Energy & Fuels. 1998 ; Vol. 12, No. 4. pp. 758-766.
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abstract = "In this study the ability of aluminum oxide to catalyze the selective oxidation of NH3 in hot pressurized (20 bar) synthetic gasification gas was examined. When the mixture of NO and O2 was used as oxidizer, it was found that part of the NO may be converted to NO2 in the gas feeding system. It was found that the ratio of NO/NO2 in the oxidizer mixture can be controlled by controlling the residence time and the temperature of the gas feeding system. Increasing the pressure increased the rate of NO2 formation. When the oxidizer consisted of NO2 and O2, large NH3 conversion was attained below 500 °C. With NO and O2 addition into the hot gasification gas the highest NH3 conversion took place at 550 °C. The addition of O2 alone to the aluminum oxide bed at high pressure reduced also the NH3 content of the gas. It was shown that aluminum oxide catalyzes the reaction between NH3 and O2.",
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Selective catalytic oxidation of NH3 in gasification gas : 3. Experiments at elevated pressure. / Leppälahti, Jukka (Corresponding Author); Kilpinen, Pia; Hupa, Mikko.

In: Energy & Fuels, Vol. 12, No. 4, 1998, p. 758-766.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Selective catalytic oxidation of NH3 in gasification gas

T2 - 3. Experiments at elevated pressure

AU - Leppälahti, Jukka

AU - Kilpinen, Pia

AU - Hupa, Mikko

PY - 1998

Y1 - 1998

N2 - In this study the ability of aluminum oxide to catalyze the selective oxidation of NH3 in hot pressurized (20 bar) synthetic gasification gas was examined. When the mixture of NO and O2 was used as oxidizer, it was found that part of the NO may be converted to NO2 in the gas feeding system. It was found that the ratio of NO/NO2 in the oxidizer mixture can be controlled by controlling the residence time and the temperature of the gas feeding system. Increasing the pressure increased the rate of NO2 formation. When the oxidizer consisted of NO2 and O2, large NH3 conversion was attained below 500 °C. With NO and O2 addition into the hot gasification gas the highest NH3 conversion took place at 550 °C. The addition of O2 alone to the aluminum oxide bed at high pressure reduced also the NH3 content of the gas. It was shown that aluminum oxide catalyzes the reaction between NH3 and O2.

AB - In this study the ability of aluminum oxide to catalyze the selective oxidation of NH3 in hot pressurized (20 bar) synthetic gasification gas was examined. When the mixture of NO and O2 was used as oxidizer, it was found that part of the NO may be converted to NO2 in the gas feeding system. It was found that the ratio of NO/NO2 in the oxidizer mixture can be controlled by controlling the residence time and the temperature of the gas feeding system. Increasing the pressure increased the rate of NO2 formation. When the oxidizer consisted of NO2 and O2, large NH3 conversion was attained below 500 °C. With NO and O2 addition into the hot gasification gas the highest NH3 conversion took place at 550 °C. The addition of O2 alone to the aluminum oxide bed at high pressure reduced also the NH3 content of the gas. It was shown that aluminum oxide catalyzes the reaction between NH3 and O2.

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U2 - 10.1021/ef9702299

DO - 10.1021/ef9702299

M3 - Article

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