Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Takeshi Furusawa, Kulathuiyer Seshan, Leonardus Lefferts, Ken-ichi Aika

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55). Between the two Co-HY catalysts, selective reduction of NO to N2 was favored over Co-HY zeolite with lower Si/Al ratio, however, oxidation of NO and combustion of C3H6 proceeded easily over that with higher Si/Al ratio. It was further shown that most of Co existed as ion-exchanged Co [Co2+ or Co2+(OH)¿] over the catalyst with lower Si/Al ratio, and as Co oxide [Co3O4] over the catalyst with higher Si/Al ratio. When bimetallic Co-Pt/HY catalysts were applied, Pt was present in metallic form in the working catalysts. Over these catalysts, conversion of NO increased with increase in the amount of Pt loading, however, selectivity to N2 decreased. The maximum yield of N2 was achieved over 0.1 wt.% Pt¿1.0 wt.% Co-HY catalyst. It is concluded that metallic form of Pt and ion-exchanged Co are essential to obtain high yield of N2, and that the role of Pt is to catalyze the oxidation of NO to NO2, which is successfully reduced by propylene over Co sites to nitrogen.
Original languageUndefined
Pages (from-to)233-246
JournalApplied catalysis B: environmental
Volume39
Issue number3
DOIs
Publication statusPublished - 2002

Keywords

  • IR-38285
  • METIS-209813

Cite this

Furusawa, Takeshi ; Seshan, Kulathuiyer ; Lefferts, Leonardus ; Aika, Ken-ichi. / Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY. In: Applied catalysis B: environmental. 2002 ; Vol. 39, No. 3. pp. 233-246.
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abstract = "Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55). Between the two Co-HY catalysts, selective reduction of NO to N2 was favored over Co-HY zeolite with lower Si/Al ratio, however, oxidation of NO and combustion of C3H6 proceeded easily over that with higher Si/Al ratio. It was further shown that most of Co existed as ion-exchanged Co [Co2+ or Co2+(OH)¿] over the catalyst with lower Si/Al ratio, and as Co oxide [Co3O4] over the catalyst with higher Si/Al ratio. When bimetallic Co-Pt/HY catalysts were applied, Pt was present in metallic form in the working catalysts. Over these catalysts, conversion of NO increased with increase in the amount of Pt loading, however, selectivity to N2 decreased. The maximum yield of N2 was achieved over 0.1 wt.{\%} Pt¿1.0 wt.{\%} Co-HY catalyst. It is concluded that metallic form of Pt and ion-exchanged Co are essential to obtain high yield of N2, and that the role of Pt is to catalyze the oxidation of NO to NO2, which is successfully reduced by propylene over Co sites to nitrogen.",
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Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY. / Furusawa, Takeshi; Seshan, Kulathuiyer; Lefferts, Leonardus; Aika, Ken-ichi.

In: Applied catalysis B: environmental, Vol. 39, No. 3, 2002, p. 233-246.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

AU - Furusawa, Takeshi

AU - Seshan, Kulathuiyer

AU - Lefferts, Leonardus

AU - Aika, Ken-ichi

PY - 2002

Y1 - 2002

N2 - Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55). Between the two Co-HY catalysts, selective reduction of NO to N2 was favored over Co-HY zeolite with lower Si/Al ratio, however, oxidation of NO and combustion of C3H6 proceeded easily over that with higher Si/Al ratio. It was further shown that most of Co existed as ion-exchanged Co [Co2+ or Co2+(OH)¿] over the catalyst with lower Si/Al ratio, and as Co oxide [Co3O4] over the catalyst with higher Si/Al ratio. When bimetallic Co-Pt/HY catalysts were applied, Pt was present in metallic form in the working catalysts. Over these catalysts, conversion of NO increased with increase in the amount of Pt loading, however, selectivity to N2 decreased. The maximum yield of N2 was achieved over 0.1 wt.% Pt¿1.0 wt.% Co-HY catalyst. It is concluded that metallic form of Pt and ion-exchanged Co are essential to obtain high yield of N2, and that the role of Pt is to catalyze the oxidation of NO to NO2, which is successfully reduced by propylene over Co sites to nitrogen.

AB - Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55). Between the two Co-HY catalysts, selective reduction of NO to N2 was favored over Co-HY zeolite with lower Si/Al ratio, however, oxidation of NO and combustion of C3H6 proceeded easily over that with higher Si/Al ratio. It was further shown that most of Co existed as ion-exchanged Co [Co2+ or Co2+(OH)¿] over the catalyst with lower Si/Al ratio, and as Co oxide [Co3O4] over the catalyst with higher Si/Al ratio. When bimetallic Co-Pt/HY catalysts were applied, Pt was present in metallic form in the working catalysts. Over these catalysts, conversion of NO increased with increase in the amount of Pt loading, however, selectivity to N2 decreased. The maximum yield of N2 was achieved over 0.1 wt.% Pt¿1.0 wt.% Co-HY catalyst. It is concluded that metallic form of Pt and ion-exchanged Co are essential to obtain high yield of N2, and that the role of Pt is to catalyze the oxidation of NO to NO2, which is successfully reduced by propylene over Co sites to nitrogen.

KW - IR-38285

KW - METIS-209813

U2 - 10.1016/S0926-3373(02)00100-5

DO - 10.1016/S0926-3373(02)00100-5

M3 - Article

VL - 39

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EP - 246

JO - Applied catalysis B: environmental

JF - Applied catalysis B: environmental

SN - 0926-3373

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