Effect of Acid Treatment on the High-Temperature Surface Oxidation Behavior of FeCrAlloy Foil Used for Methane Combustion Catalyst Support

Zhang, Dong; Zhang, Lihong; Liang, Bin; Li, Yongdan

doi:10.1021/ie8019664

Cited by 21 publications

(7 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chemical pretreatment of FeCrAl increases the oxidation rate as well as the superficial roughness that creates mechanical junctions (Figure 9c). 98 Thermal pretreatment is more effective than the chemical pretreatment, but combining both is best (Figure 9d). 99 FeCrAl preferentially begins to degrade at points where the Al 2 O 3 surface has defects or inhomogeneities.…”

Section: Pretreatment Of the Fecralmentioning

confidence: 99%

“…Additional FeCrAl pretreatment is necessary, however, because the Al 2 O 3 layer (after preoxidation) is rarely thick enough to protect the metal and the surface area is too low for catalysis (Figure b). Chemical pretreatment of FeCrAl increases the oxidation rate as well as the superficial roughness that creates mechanical junctions (Figure c) . Thermal pretreatment is more effective than the chemical pretreatment, but combining both is best (Figure d) …”

Section: Catalyst Preparationmentioning

confidence: 99%

See 1 more Smart Citation

FeCrAl as a Catalyst Support

et al. 2020

View full text Add to dashboard Cite

The iron-chromium-aluminum alloy (FeCrAl) is an exceptional support for highly exothermic and endothermic reactions that operate above 700 °C in chemically aggressive environments, where low heat and mass transfer rates limit reaction yield. FeCrAl two-and three-dimensional structured networksmonoliths, foams, and fibersmaximize mass transfer rates, while their remarkable thermal conductivity minimizes hot spots and thermal gradients. Another advantage of the open FeCrAl structure is the low pressure drop due to the high void fraction and regularity of the internal path. The surface Al 2 O 3 layer, formed after an initial thermal oxidation, supports a wide range of metal and metal oxide active phases. The aluminum oxide that adheres to the metal surface protects it from corrosive atmospheres and carbon (carburization), thus allowing FeCrAl to operate at a higher temperature. The top applications are industrial burners, in which compact knitted metal fibers distribute heat over large surface areas, and automotive tail gas converters. Future applications include producing H 2 and syngas from remote natural gas in modular units. This Review summarizes the specific preparation techniques, details process operating conditions and catalyst performance of several classes of reactions, and highlights positive and challenging aspects of FeCrAl.

show abstract

Section: Pretreatment Of the Fecralmentioning

confidence: 99%

Section: Catalyst Preparationmentioning

confidence: 99%

FeCrAl as a Catalyst Support

et al. 2020

View full text Add to dashboard Cite

show abstract

“…It is a consensus that the surface morphology of metallic substrate acts as a significant factor in washcoat adhesion and further impacts on the mechanical stability of metal monolithic catalyst. Chemical pretreatment and thermal‐oxidation pretreatment are usually used separately to improve adhesion of the washcoat layer on the metallic substrate surface by exerting an influence on the morphology and surface elemental composition of FeCrAl alloy foils , Table gives a description of the prepared catalyst samples under different conditions.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Stability of Monolithic Catalysts: The Influence Mechanism of Primer on the Washcoat Adhesion to the Metallic Substrates

Zhang

2019

ChemistrySelect

View full text Add to dashboard Cite

The mechanical stability of monolithic catalysts significantly impacts the performance of industrial monolithic reactors, because the washcoat layer usually shows bad adhesion to the substrate. In this paper, to obtain washcoated monolith with high mechanical stability, a modified method is chosen: A primer is introduced first and an alumina slurry coating is further washcoated on FeCrAl alloy foils. Advisable coating compositions are determined and it is found that the calcination of primer has an obviously bad influence on the washcoat adhesion property. Furthermore, the influence mech-anism of primer on the washcoat adhesion is discussed. It is speculated that the cross-linkings between the alumina particles and PEG make the primer disperse homogeneously and connect tightly with the pretreated metallic substrate. When coating the second slurry layer, the dissolution of primer will narrow the gap between the primer and the slurry coating layer, which makes the particles at the primer-slurry interface connect together, and all of these are conductive to obtain homogeneous and tightness washcoat, showing good adhesion to the metallic substrate.

show abstract

“…This situation requires a new look at the possibility of producing the composite ceramic-metal layers of well-integrated with the steel substrate wherein the catalytically active metal phase is active and simultaneously dispersed [24]. Due to the limited content of aluminum in the melt, resulting in appropriate mechanical, electrical and thermal (heat resistant) properties, there is limited scope for obtaining the oxide layer of suitable structural configuration and a developed surface.…”

Section: Introductionmentioning

confidence: 99%

On the morphological investigation of Pt dispersion and structure of alumina-platinum composites obtained by thermal oxidation of Al-Pt nano thin layers

Reszka

Morgiel

Rydzkowski

et al. 2019

Nano-Structures & Nano-Objects

View full text Add to dashboard Cite

This article presents the methodology for the Pt/Al and Pt/Al nanolaminates production as well as Pt + Al composites using two magnetrons by preparing the oxide-metal composites through high temperature oxidation of nanofilms deposited by PVD method on a metal substrate. In this article, we described the nanostructures obtained as a result of PVD technology. The applied layers were oxidized at a temperature of 860°C under Ar + O2 for 48 hours. SEM surface analysis of the obtained nanolaminates showed that the base of the oxidized laminates was covered with a fine wafer and whisker structure with an anisotropic growth orientation. Oxidation of composite layers provided the growth of chaotically oriented and mutually penetrable whiskers and small crystals. Analysis of nanolayers by the TEM technique indicated that the growth of oxide crystals leads to the dissipation of Pt particles. The comparison of oxide layers obtained with the Pt/Al system with oxide layers obtained with Pt + Al composite nanofilms indicates that those obtained through the oxidation of nanofilms shows a greater surface development. This is due to the partial covering of Pt particles through the Al layer, which causes a very strong fragmentation of the Pt nanofilms occurring during oxidation. During the oxidation in the entire volume of nanofilms, strong stresses are created that cause numerous nano-cracks, which promotes the expansion of the surface and its high activity.

show abstract

Effect of Acid Treatment on the High-Temperature Surface Oxidation Behavior of FeCrAlloy Foil Used for Methane Combustion Catalyst Support

Cited by 21 publications

References 55 publications

FeCrAl as a Catalyst Support

FeCrAl as a Catalyst Support

Mechanical Stability of Monolithic Catalysts: The Influence Mechanism of Primer on the Washcoat Adhesion to the Metallic Substrates

On the morphological investigation of Pt dispersion and structure of alumina-platinum composites obtained by thermal oxidation of Al-Pt nano thin layers

Contact Info

Product

Resources

About