Cooperation of Pt/Al2O3 and In/Al2O3 catalysts for NO reduction by propene in lean burn condition

Li, Junhua; Hao, Jiming; Fu, Liqun; Zhu, Tianle; Liu, Z.; Cui, Xiangyu

doi:10.1016/j.apcata.2004.01.001

Cited by 29 publications

(12 citation statements)

References 46 publications

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“…The former peak might be due to the decomposition of nitrite species (ad-NO ) 2 ) [21]. The desorption of O 2 accompanied with the desorption of NO 2 was observed at the high temperature above 350°C in our previous work [22]. It is noted that the NO adspecies (ad-NO 3 ) ) decompose to NO 2 and O 2 at high temperature range.…”

Section: Discussionmentioning

confidence: 80%

“…It is noted that the NO adspecies (ad-NO 3 ) ) decompose to NO 2 and O 2 at high temperature range. Since ad-NO 3 ) species formed on the catalyst surface is known to play an important role in NO reduction [21,22], ad-NO 3 ) species desorbed above 350°C are presumed to participate in NO reduction reaction. Based on the different preparation method, the intensities of NO desorption peak are also different, and the decrease order of the amount of NO 2 desorption is in accordance with the catalytic activity and the surface area of the catalysts,…”

Section: Discussionmentioning

confidence: 99%

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Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Hao

Cui

et al. 2005

Catal Lett

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Selective catalytic reduction of NO with propene was investigated over In 2 O 3 /Al 2 O 3 catalysts prepared by three methods, namely, a single sol-gel (SG), impregnation (IM), and co-precipitation method (CP). The catalysts were characterized by means of BET, XRD, XPS, and TPD. The maximum NO conversion over In 2 O 3 /Al 2 O 3 prepared by sol-gel method was 95% at 400°C in the absence of H 2 O, and the activity decreased slightly in the presence of H 2 O, and it was still 76% even in the presence of H 2 O and SO 2 . Although the retarding effect of SO 2 on the activity was observed for the three catalysts, In 2 O 3 /Al 2 O 3 (SG) showed relatively high activity. It is found that the high surface area and low average pore diameter are important to the catalytic activity, and the strong interaction between indium and alumina for In 2 O 3 /Al 2 O 3 catalyst prepared by sol-gel method may be the reason of high activity for NO reduction. The reaction and surface studies showed that NO 3 ) and partially oxidized hydrocarbons (RCOO ) species) are mainly intermediates, and the oxidation C 3 H 6 to RCOO ) species maybe the key reaction process in the SCR of NO with C 3 H 6 .

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Hao

Cui

et al. 2005

Catal Lett

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“…5 Noble metal catalysts such as Pt/Al 2 O 3 exhibit high deNO x activity in the low temperature range of 200-300 1C while exhibiting a narrow operation temperature window. 20,21 Up to now, alumina-supported silver (Ag/Al 2 O 3 ) has been known as one of the most effective catalysts for the HC-SCR even in the presence of water vapor and SO 2 . 13,16,[22][23][24][25][26][27][28][29][30][31][32] The distinctive advantage of HC-SCR is that the on-board fuel can be used as the reductant for NO x conversion, thus reducing the cost involved in infrastructure development for delivering the reductant to the automotive engine exhaust system.…”

Section: Introductionmentioning

confidence: 99%

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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Selective catalytic reduction of NO x using NH 3 or hydrocarbons (NH 3 -SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure-activity relationship of vanadium-free catalysts in the NH 3 -SCR reaction is discussed in detail, including Fe-, Ce-based oxide catalysts and Fe-, Cu-based zeolite catalysts, which is beneficial for catalyst redesign and activity improvement. Based on our research, a comprehensive mechanism contributing to the performance of Ag/Al 2 O 3 in HC-SCR is provided, giving a clue to the design of a catalytic system with high efficiency.

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“…Figure 1(b) shows XRD patterns of Pt/ALa 9 Si 6 O 26 catalysts and Pt/La 9.33 -Si 6 O 26 catalyst prepared by the impregnation method. The peaks of apatite-type phase were observed after Pt loading, and no apparent peaks of Pt derived phase, such as Pt, PtO and PtO 2 , were detected, suggesting that no large crystalline Pt compounds 6 O 26 , respectively. These values indicate that the amounts of exposed Pt atoms on catalyst surface were small, and no significant difference of Pt dispersion was observed among the catalysts.…”

Section: Evaluation Of Catalytic Activitymentioning

confidence: 93%

“…In our previous study, it was found that the catalytic activity of the apatite-type La 9.33 Si 6 O 26 supported Pt catalyst was higher than that of £-Al 2 O 3 supported Pt catalyst. 15) Furthermore, the catalytic activity of the apatite-type lanthanum silicate supported Pt catalyst was promoted by substitution of alkaline earth metals (Ca, Sr, Ba) at La site.…”

Section: Introductionmentioning

confidence: 99%

Preparation and NO reduction property of apatite-type ALa9Si6O26 (A = Li, Na, K) supported Pt catalyst

Ono

Kato

Narumi

et al. 2013

J. Ceram. Soc. Japan

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Apatite-type ALa 9 Si 6 O 26 (A = Li, Na, K) were prepared by solid state reaction method. The hexagonal unit cell volumes of ALa 9 Si 6 O 26 increased with increasing ionic radii of alkali metal ions, indicating that the alkali metal ions were incorporated into the apatite-type lattice. The specific surface areas of ALa 9 Si 6 O 26 were less than 1 m 2 /g. X-ray photoelectron spectroscopy measurement showed that Pt species on as-prepared catalysts were highly oxidized. Reduction temperature of Pt oxides on the catalyst for temperature-programmed reduction by H 2 was decreased by substitution of alkali metal ion at La site in the apatitetype silicate. For C 3 H 6 NOO 2 reaction, Pt/NaLa 9 Si 6 O 26 catalyst exhibited a maximum NO conversion of 42%, the highest among Pt/ALa 9 Si 6 O 26 catalysts. The temperature for maximum NO conversion over Pt/NaLa 9 Si 6 O 26 catalyst was lower than that over Pt/£-Al 2 O 3 catalyst under the same reaction condition. The temperature of 50% C 3 H 6 conversion for C 3 H 6 O 2 reaction over Pt/ALa 9 Si 6 O 26 catalysts increased in the sequence of A = K < A = Na < A = Li. In addition, C 3 H 6 oxidation activity was suppressed by presence of CO 2 and NO on the catalyst. These results suggest that the basic sites on the apatite-type support affect the catalytic activities of Pt/ALa 9 Si 6 O 26 catalysts for C 3 H 6 NOO 2 and C 3 H 6 O 2 reaction.

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Cooperation of Pt/Al2O3 and In/Al2O3 catalysts for NO reduction by propene in lean burn condition

Cited by 29 publications

References 46 publications

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Preparation and NO reduction property of apatite-type ALa<sub>9</sub>Si<sub>6</sub>O<sub>26</sub> (A = Li, Na, K) supported Pt catalyst

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Cooperation of Pt/Al2O3 and In/Al2O3 catalysts for NO reduction by propene in lean burn condition

Cited by 29 publications

References 46 publications

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Preparation and NO reduction property of apatite-type ALa<sub>9</sub>Si<sub>6</sub>O<sub>26</sub> (A = Li, Na, K) supported Pt catalyst

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Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects