Investigation of the hydrothermal aging of an Mn-based mullite SmMn<sub>2</sub>O<sub>5</sub> catalyst of NO oxidation

Xue, Lina; Xiong, Ka; Chen, Haijun; Cho, Kyeongjae; Wang, Weichao

doi:10.1039/c7ra09306c

Cited by 24 publications

(15 citation statements)

References 26 publications

(28 reference statements)

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“…In the other hand, mullite denoted 3Al 2 O 3 •2SiO 2 or Al 6 Si 2 O 13 is an aluminosilicate known for various properties that make it suitable for its usage in the fragrance lamp industry. These properties include good resistance to thermal shock, resistance to abrasion and extraordinary corrosion resistance to most chemicals [14][15][16][17][18][19]. Some studies also reported that a mullite catalyst has a remarkable catalytic performance towards NO oxidation as shown by Wang and al.…”

Section: Introductionmentioning

confidence: 94%

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

2019

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Total catalytic oxidation of isopropyl alcohol (IPA), used in fragrance lamp industry, remains one of the most popular techniques to remove indoor environmental pollutants (Volatile Organic compounds VOC). Many catalysts were already used in such technique. In our study, catalytic oxidation of isopropyl alcohol was investigated on catalysts based on platinum. The influence of two parameters on the catalytic activity was studied: the active phase content and the effect of methyl cellulose on Pt particles dispersion. In this study, mullite (Al 6 Si 2 O 13) known for its excellent thermal stability and thermal shock resistance, and alumina (α-Al 2 O 3) were used as supports. Pt/α-Al 2 O 3 and Pt/Al 6 Si 2 O 13 catalysts were prepared using the impregnation method. Platinum supported on mullite was synthetized in two different ways, with and without methyl cellulose (MC) in order to study the influence of adding methyl cellulose on the platinum particles dispersion over mullite. Furthermore, the resulting materials were characterized by BET, X-Ray diffraction (XRD), transmission electron microscopy (TEM) and H 2-chemisorption to determine the dispersion of platinum particles. All the catalysts were tested in total catalytic oxidation of isopropyl alcohol. This study showed that Pt/Al 6 Si 2 O 13 synthesized with MC exhibited better activity performance than the one prepared without MC. This can be explained by the fact that the addition of MC enhanced the Pt dispersion over mullite leading to an improvement in the catalytic activity and the selectivity into carbon dioxide. At the end, this study presents scientific findings and many attracted research interest concerning the use of hydrogel based methyl cellulose as a dispersing agent in the synthesis of catalysts.

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Section: Introductionmentioning

confidence: 94%

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

2019

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“…When SmMn 2 O 5 catalysts are aged in 10% H 2 O stream at 750 °C for 16 h, Xue et al observed a shift in light‐off temperature to a higher temperature by 25 °C and a 12% decrease in conversion efficiency compared with the fresh sample. [ 77 ] The authors attributed the loss in performance to a decrease in specific surface area by 68% from particle aggregation and the formation of new Mn 2 O 3 and SmMnO 3 phases during the aging process. [ 77 ] SmMnO 3 phase has lower catalytic performance compared with the SmMn 2 O 5 phase.…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

“…[ 77 ] The authors attributed the loss in performance to a decrease in specific surface area by 68% from particle aggregation and the formation of new Mn 2 O 3 and SmMnO 3 phases during the aging process. [ 77 ] SmMnO 3 phase has lower catalytic performance compared with the SmMn 2 O 5 phase. [ 39,77 ] In the case of GdMn 2 O 5 in acetone oxidation, Dong et al reported an initial 14% drop in performance during the initial durability measurement at 200 °C with a 5% H 2 O stream.…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

“…[ 77 ] SmMnO 3 phase has lower catalytic performance compared with the SmMn 2 O 5 phase. [ 39,77 ] In the case of GdMn 2 O 5 in acetone oxidation, Dong et al reported an initial 14% drop in performance during the initial durability measurement at 200 °C with a 5% H 2 O stream. However, the efficiency reverted to 94% after 50 h and remained stable for 150 h. With the removal of H 2 O from the gas stream, GdMn 2 O 5 maintained 100% acetone conversion efficiency for the next 100 h. [ 43 ] Meanwhile, YMn 2 O 5 showed excellent durability for the oxidation of VOCs by maintaining its catalytic activity for 400 h at 275 °C.…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

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Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Thampy

Ashburn

Cho

et al. 2021

Adv Energy and Sustain Res

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Driving innovations in the field of catalysis and electrocatalysis for a sustainable future necessitates the development of highly active, thermally stable, and low‐cost heterogeneous catalysts. Earth‐abundant transition metal‐based oxide catalysts are highly sought after to replace expensive platinum group metals. Identifying new catalyst formulations and design principles to tune materials’ bulk electronic structures and surface energetics for enhanced catalytic activity accelerates the search. Herein, the inherent attributes of mullite‐type oxides in catalyzing various oxidation reactions—crystal structure, electronic structure, stability, and catalytic activity—are reviewed. A comprehensive understanding of the nature of active sites, oxidation mechanisms, strategies to enhance the catalytic performance and regeneration of active sites, emerging opportunities in electrocatalysis and sensors, and challenges in computational methodologies is discussed. Finally, a perspective on expanding mullite‐type oxides’ viability for commercial applications in environmental and sustainable energy production through the integration of advanced synthetic approaches, operando spectroscopic techniques, and high‐throughput computational tools is outlined.

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“…For this specific catalyst, octahedral and pyramidal crystal fields coexist, so that this structure has partial characteristics of both zeolithes and common oxides like Al 2 O 3 and SiO 2 (Xue et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

CATALYTIC OXIDATION OF ISOPROPYL ALCOHOL OVER PLATINUM BASED CATALYST: A STUDY OF THE EFFECT OF METHYL CELLULOSE ON Pt PARTICLES DISPERSION OVER MULLITE

Abbas-Ghaleb

Chlala

2019

Braz. J. Chem. Eng.

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Isopropyl alcohol (IPA) catalytic oxidation remains one of the most popular techniques to remove volatile organic compounds from indoor places. In our study, catalytic oxidation of IPA was investigated on catalysts based on platinum deposited on mullite (Al 6 Si 2 O 13 ), known for its excellent thermal stability. Pt/ Al 6 Si 2 O 13 catalysts were prepared by impregnation with and without methyl cellulose (MC) and were tested in order to study the influence of MC on the platinum particle dispersion over the support. The catalytic reactivity was compared with Pt/α-alumina and Pt/SiO 2 . Moreover, the resulting materials were characterized by BET, XRD, TEM and H 2 -chemisorption. This study showed that platinum exhibits better dispersion on alumina sites than silica sites. This can be due to a strong interaction between platinum and alumina, leading to a higher dispersion of platinum species. Furthermore, the addition of MC enhanced the Pt dispersion over the mullite, leading to an improvement in the catalytic performance.

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Investigation of the hydrothermal aging of an Mn-based mullite SmMn₂O₅ catalyst of NO oxidation

Abstract: The decrease in the catalytic performance for NO oxidation of the Mn-based mullite SmMn2O5 after being subjected to hydrothermal aging was mainly caused by an ∼3-fold decrease in its specific surface area (BET).

Cited by 24 publications

References 26 publications

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

CATALYTIC OXIDATION OF ISOPROPYL ALCOHOL OVER PLATINUM BASED CATALYST: A STUDY OF THE EFFECT OF METHYL CELLULOSE ON Pt PARTICLES DISPERSION OVER MULLITE

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Investigation of the hydrothermal aging of an Mn-based mullite SmMn2O5 catalyst of NO oxidation

Abstract: The decrease in the catalytic performance for NO oxidation of the Mn-based mullite SmMn2O5 after being subjected to hydrothermal aging was mainly caused by an ∼3-fold decrease in its specific surface area (BET).

Cited by 24 publications

References 26 publications

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

Isopropyl Alcohol Total Oxidation Over Platinum Supported on Alumina and Mullite

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

CATALYTIC OXIDATION OF ISOPROPYL ALCOHOL OVER PLATINUM BASED CATALYST: A STUDY OF THE EFFECT OF METHYL CELLULOSE ON Pt PARTICLES DISPERSION OVER MULLITE

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Investigation of the hydrothermal aging of an Mn-based mullite SmMn₂O₅ catalyst of NO oxidation