Au-Pd@Meso-Co3O4: A Promising Material For New Generation Pellistor with Low Working Temperature

Lyu, Xuemeng; Gao, Huadong; Diehle, Patrick; Altmann, Frank; Tarantik, Karina R.; Schmitt, Katrin; Wöllenstein, Jürgen

doi:10.1109/transducers.2019.8808272

Cited by 2 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, Au-Pd nanoparticles are also observed inside the surface near pores. In combination with previous investigations in transmission, we conclude that the AuPd-nanoparticles are homogenously dispersed throughout the complete mesoporous network [22,23]. Thus, the mesoporous system of Co 3 O 4 provides a high specific surface area for anchoring nanoparticles and a high number of active sites for catalytic reactions, which explains the high activity of the catalyst.…”

Section: Morphological Characterizationsupporting

confidence: 83%

“…After overnight drying in an oven at 80 • C, the mesoporous Co 3 O 4 was obtained. XRD measurements confirmed the crystalline structure of the meso-Co 3 O 4 material [22].…”

Section: Methodssupporting

confidence: 52%

“…For preparation of the Au-Pd@meso-Co 3 O 4 catalyst, a desired amount of mesoporous Co 3 O 4 was mixed with Au-Pd alloy solution and stirred for 12 h. After filtration with deionized (DI) water, the Au-Pd@PVA@meso-Co 3 O 4 material was calcined at 400 • C for 6 h to remove the polymer surface stabilizer and to anchor the particles on the metal oxide surface. Finally, an Au-Pd@meso-Co 3 O 4 catalyst loaded with 7.5 wt% of Au-Pd particles was obtained, as confirmed by EDX analysis [22].…”

Section: Methodsmentioning

confidence: 57%

“…The synthesis process of mesoporous Co 3 O 4 supported alloyed Au-Pd nanoparticles (Au-Pd@meso-Co 3 O 4 ) was introduced in our former work [22,23]. The synthesis was performed according to Zhixing, et al [11].…”

Section: Methodsmentioning

confidence: 99%

“…In this context, we examined in previous works mesoporous CO 3 O 4 -supported Au-Pd nanoparticles (Au-Pd@meso-Co 3 O 4 ) as catalysts for application in catalytic combustion sensors [22,23]. Catalytic combustion sensors are essential devices for the early detection of flammable and explosive gases in various applications, e.g., in coal mines, petroleum drilling, landfills and domestic fields [24,25].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Accelerated Deactivation of Mesoporous Co3O4-Supported Au–Pd Catalyst through Gas Sensor Operation

et al. 2023

Self Cite

View full text Add to dashboard Cite

High activity of a catalyst and its thermal stability over a lifetime are essential for catalytic applications, including catalytic gas sensors. Highly porous materials are attractive to support metal catalysts because they can carry a large quantity of well-dispersed metal nanoparticles, which are well-accessible for reactants. The present work investigates the long-term stability of mesoporous Co3O4-supported Au–Pd catalyst (Au–Pd@meso-Co3O4), with a metal loading of 7.5 wt% and catalytically active mesoporous Co3O4 (meso-Co3O4) for use in catalytic gas sensors. Both catalysts were characterized concerning their sensor response towards different concentrations of methane and propane (0.05–1%) at operating temperatures ranging from 200 °C to 400 °C for a duration of 400 h. The initially high sensor response of Au–Pd@meso-Co3O4 to methane and propane decreased significantly after a long-term operation, while the sensor response of meso-Co3O4 without metallic catalyst was less affected. Electron microscopy studies revealed that the hollow mesoporous structure of the Co3O4 support is lost in the presence of Au–Pd particles. Additionally, Ostwald ripening of Au–Pd nanoparticles was observed. The morphology of pure meso-Co3O4 was less altered. The low thermodynamical stability of mesoporous structure and low phase transformation temperature of Co3O4, as well as high metal loading, are parameters influencing the accelerated sintering and deactivation of Au–Pd@meso-Co3O4 catalyst. Despite its high catalytic activity, Au–Pd@meso-Co3O4 is not long-term stable at increased operating temperatures and is thus not well-suited for gas sensors.

show abstract

Section: Morphological Characterizationsupporting

confidence: 83%

“…After overnight drying in an oven at 80 • C, the mesoporous Co 3 O 4 was obtained. XRD measurements confirmed the crystalline structure of the meso-Co 3 O 4 material [22].…”

Section: Methodssupporting

confidence: 52%

Section: Methodsmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Accelerated Deactivation of Mesoporous Co3O4-Supported Au–Pd Catalyst through Gas Sensor Operation

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Towards Low Temperature Operation of Catalytic Gas Sensors: Mesoporous Co3O4-Supported Au–Pd Nanoparticles as Functional Material

et al. 2023

Self Cite

View full text Add to dashboard Cite

It is shown that the operating temperature of pellistors for the detection of methane can be reduced to 300 °C by using Au–Pd nanoparticles on mesoporous cobalt oxide (Au–Pd@meso-Co3O4). The aim is to reduce possible catalyst poisoning that occurs during the high-temperature operation of conventional Pd-based pellistors, which are usually operated at 450 °C or higher. The individual role of Au–Pd as well as Co3O4 in terms of their catalytic activity has been investigated. Above 300 °C, Au–Pd bimetallic particles are mainly responsible for the catalytic combustion of methane. However, below 300 °C, only the Co3O4 has a catalytic effect. In contrast to methane, the sensor response and the temperature increase of the sensor under propane exposure is much larger than for methane due to the larger heat of combustion of propane. Due to its lower activation energy requirement, propane exhibits a higher propensity for oxidation compared to methane. As a result, the detection of propane can be achieved at even lower temperatures due to its enhanced reactivity.

show abstract

Au-Pd@Meso-Co3O4: A Promising Material For New Generation Pellistor with Low Working Temperature

Cited by 2 publications

References 5 publications

Accelerated Deactivation of Mesoporous Co3O4-Supported Au–Pd Catalyst through Gas Sensor Operation

Accelerated Deactivation of Mesoporous Co3O4-Supported Au–Pd Catalyst through Gas Sensor Operation

Towards Low Temperature Operation of Catalytic Gas Sensors: Mesoporous Co3O4-Supported Au–Pd Nanoparticles as Functional Material

Contact Info

Product

Resources

About