Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La0.5Sr0.5MnO3-δ microcubes for the combustion of toluene

Jiguang Deng; Yue Zhang; Hongxing Dai; Lei Zhang; Hong He; C. T. Au

doi:10.1016/j.cattod.2008.08.010

Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La_0.5Sr_0.5MnO_3-δ microcubes for the combustion of toluene

Jiguang Deng, Yue Zhang, Hongxing Dai^*, Lei Zhang, Hong He, C. T. Au

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

37 Citations (Scopus)

Abstract

Perovskite-type oxide La_0.5Sr_0.5MnO_3-δ catalysts were fabricated hydrothermally at 220, 240, 250 or 270 °C for 50 h (denoted as LSMO-220, LSMO-240, LSMO-250, and LSMO-270, respectively). We characterized the materials by a number of analytical techniques. It was found that the La_0.5Sr_0.5MnO_3-δ samples are single-crystalline cubic perovskite-type oxides in the form of microcubes. The as-fabricated samples displayed various surface and bulk compositions that can be related to the discrepancy in treatment temperature. The surface Mn/(La + Sr + Mn) ratio and the initial H₂ consumption rate at low-temperatures increase according to the sequence of LSMO-240 < LSMO-270 < LSMO-220 < LSMO-250. We observed that the surface Mn⁴⁺/Mn³⁺ ratio and catalytic performance of the materials follow a similar order. The temperature for 100% toluene conversion over LSMO-250 was 280 °C. The excellent performance of the materials can be related to (i) Mn surface enrichment, (ii) high Mn⁴⁺/Mn³⁺ ratio, (iii) oxygen nonstoichiometry, and (iv) single-crystalline structure of the catalysts.

Original language	English
Pages (from-to)	82-87
Number of pages	6
Journal	Catalysis Today
Volume	139
Issue number	1-2
DOIs	https://doi.org/10.1016/j.cattod.2008.08.010
Publication status	Published - 15 Dec 2008

User-Defined Keywords

Hydrothermal synthesis
Microcube
Single-crystalline perovskite-type oxide
Toluene oxidation
Volatile organic compounds

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10.1016/j.cattod.2008.08.010

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title = "Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La0.5Sr0.5MnO3-δ microcubes for the combustion of toluene",

abstract = "Perovskite-type oxide La0.5Sr0.5MnO3-δ catalysts were fabricated hydrothermally at 220, 240, 250 or 270 °C for 50 h (denoted as LSMO-220, LSMO-240, LSMO-250, and LSMO-270, respectively). We characterized the materials by a number of analytical techniques. It was found that the La0.5Sr0.5MnO3-δ samples are single-crystalline cubic perovskite-type oxides in the form of microcubes. The as-fabricated samples displayed various surface and bulk compositions that can be related to the discrepancy in treatment temperature. The surface Mn/(La + Sr + Mn) ratio and the initial H2 consumption rate at low-temperatures increase according to the sequence of LSMO-240 < LSMO-270 < LSMO-220 < LSMO-250. We observed that the surface Mn4+/Mn3+ ratio and catalytic performance of the materials follow a similar order. The temperature for 100% toluene conversion over LSMO-250 was 280 °C. The excellent performance of the materials can be related to (i) Mn surface enrichment, (ii) high Mn4+/Mn3+ ratio, (iii) oxygen nonstoichiometry, and (iv) single-crystalline structure of the catalysts.",

keywords = "Hydrothermal synthesis, Microcube, Single-crystalline perovskite-type oxide, Toluene oxidation, Volatile organic compounds",

author = "Jiguang Deng and Yue Zhang and Hongxing Dai and Lei Zhang and Hong He and Au, {C. T.}",

note = "Funding Information: This work was supported by the NSF of Beijing Municipality (Key Class B project of grant No. KZ200610005004), the SRF for ROCS (State Education Ministry of China), and the PHR (IHLB) of Beijing Municipality. CTA thanks the RGC, Hong Kong Special Administration Region for financial support (Grant no. HKBU 200106).",

year = "2008",

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doi = "10.1016/j.cattod.2008.08.010",

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T1 - Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La0.5Sr0.5MnO3-δ microcubes for the combustion of toluene

AU - Deng, Jiguang

AU - Zhang, Yue

AU - Dai, Hongxing

AU - Zhang, Lei

AU - He, Hong

AU - Au, C. T.

N1 - Funding Information: This work was supported by the NSF of Beijing Municipality (Key Class B project of grant No. KZ200610005004), the SRF for ROCS (State Education Ministry of China), and the PHR (IHLB) of Beijing Municipality. CTA thanks the RGC, Hong Kong Special Administration Region for financial support (Grant no. HKBU 200106).

PY - 2008/12/15

Y1 - 2008/12/15

N2 - Perovskite-type oxide La0.5Sr0.5MnO3-δ catalysts were fabricated hydrothermally at 220, 240, 250 or 270 °C for 50 h (denoted as LSMO-220, LSMO-240, LSMO-250, and LSMO-270, respectively). We characterized the materials by a number of analytical techniques. It was found that the La0.5Sr0.5MnO3-δ samples are single-crystalline cubic perovskite-type oxides in the form of microcubes. The as-fabricated samples displayed various surface and bulk compositions that can be related to the discrepancy in treatment temperature. The surface Mn/(La + Sr + Mn) ratio and the initial H2 consumption rate at low-temperatures increase according to the sequence of LSMO-240 < LSMO-270 < LSMO-220 < LSMO-250. We observed that the surface Mn4+/Mn3+ ratio and catalytic performance of the materials follow a similar order. The temperature for 100% toluene conversion over LSMO-250 was 280 °C. The excellent performance of the materials can be related to (i) Mn surface enrichment, (ii) high Mn4+/Mn3+ ratio, (iii) oxygen nonstoichiometry, and (iv) single-crystalline structure of the catalysts.

AB - Perovskite-type oxide La0.5Sr0.5MnO3-δ catalysts were fabricated hydrothermally at 220, 240, 250 or 270 °C for 50 h (denoted as LSMO-220, LSMO-240, LSMO-250, and LSMO-270, respectively). We characterized the materials by a number of analytical techniques. It was found that the La0.5Sr0.5MnO3-δ samples are single-crystalline cubic perovskite-type oxides in the form of microcubes. The as-fabricated samples displayed various surface and bulk compositions that can be related to the discrepancy in treatment temperature. The surface Mn/(La + Sr + Mn) ratio and the initial H2 consumption rate at low-temperatures increase according to the sequence of LSMO-240 < LSMO-270 < LSMO-220 < LSMO-250. We observed that the surface Mn4+/Mn3+ ratio and catalytic performance of the materials follow a similar order. The temperature for 100% toluene conversion over LSMO-250 was 280 °C. The excellent performance of the materials can be related to (i) Mn surface enrichment, (ii) high Mn4+/Mn3+ ratio, (iii) oxygen nonstoichiometry, and (iv) single-crystalline structure of the catalysts.

KW - Hydrothermal synthesis

KW - Microcube

KW - Single-crystalline perovskite-type oxide

KW - Toluene oxidation

KW - Volatile organic compounds

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DO - 10.1016/j.cattod.2008.08.010

M3 - Journal article

AN - SCOPUS:54849432728

SN - 0920-5861

VL - 139

SP - 82

EP - 87

JO - Catalysis Today

JF - Catalysis Today

IS - 1-2

ER -

Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La_0.5Sr_0.5MnO_3-δ microcubes for the combustion of toluene

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