The deposition of γ-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts

Valentini, M.; Groppi, Gianpiero; Cristiani, Cinzia; Levi, Marinella; Tronconi, Enrico; Forzatti, Pio

doi:10.1016/s0920-5861(01)00383-2

Cited by 254 publications

(185 citation statements)

References 4 publications

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“…Similarly, the preparation procedure, coating thickness and adhesion of the alumina layer play a significant role for monoliths. Successes in coating methods, such as oxidation of bulk aluminium [110], slurry coating [111], chemical vapour deposition [112] and anodization of aluminium [113,114], have been reported. Slurry coating may be simpler and cost effective.…”

Section: Coating Alumina On a Metallic Surfacementioning

confidence: 99%

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Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

2017

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Considerable research has been conducted on monolithic catalysts for various applications. Strategies toward coating monoliths are of equal interest and importance. In this paper, the preparation of monoliths and monolithic catalysts have been summarized. More specifically, a brief explanation for the manufacturing of ceramic and metallic monoliths has been provided. Also, different methods for coating γ-alumina, as a secondary support, are included. Techniques used to deposit metal-based species, zeolites and carbon onto monoliths are discussed. Furthermore, monoliths extruded with metal oxides, zeolites and carbon are described. The main foci are on the reasoning and understanding behind the preparation of monolithic catalysts. Ideas and concerns are also contributed to encourage better approaches when designing these catalysts. More importantly, the relevance of monolithic structures to reactions, such as the selective oxidation of alkanes, catalytic combustion for power generation and the preferential oxidation of carbon monoxide, has been described.

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Section: Coating Alumina On a Metallic Surfacementioning

confidence: 99%

“…Slurry coating may be simpler and cost effective. A combination of sol-gel and slurry coating has also proven effective for coating alumina on metallic surfaces [111,115].…”

Section: Coating Alumina On a Metallic Surfacementioning

confidence: 99%

Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

2017

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“…On one hand, as the slurry concentrates in Al2O3, few immersions are required to achieve a given amount of washcoated alumina, but on the other hand, the increase in the slurry viscosity resulted in non-homogeneous coating. The influence of the slurry viscosity on the alumina layer homogeneity has been associated with the ease for the suspension excess to be blown out from the monolith channels [48][49][50]. Another characteristic to be controlled is the stabilization of the alumina slurry so as to avoid the particles from settling down.…”

Section: Preparation Procedures Of Monolithic Nsr Catalystsmentioning

confidence: 99%

NOx Storage and Reduction for Diesel Engine Exhaust Aftertreatment

Pereda‐Ayo¹,

González‐Velasco²

2013

Diesel Engine - Combustion, Emissions and Condition Monitoring

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“…To form an alumina layer on the steel surface the sheets were calcined at 1,000°C for 10 h. It was proved that this kind of treatment causes alumina whiskers growing on the stainless sheet support containing aluminium [10]. (b) Primer deposition to improve adherence of a washcoat layer, the primer layer was deposited.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…The stainless steel sheets were dipped in the boehmite solution obtained using Yoldas method [11], withdrawn with controlled speed 3 cm min -1 and dried at room temperature. (c) Coating deposition to obtain the c-Al 2 O 3 , the Al(OH) 3 powder (Sigma-Aldrich 23,918-6) was calcined at 700°C for 6 h. Thus obtained alumina was dispersed in HNO 3 aqueous solution in the following proportions [10]:…”

Section: Catalyst Preparationmentioning

confidence: 99%

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

et al. 2013

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The application of the wire gauzes as the catalytic supports can provide a number of advantages in biogas exhaust abatement. In this paper, a model of wire gauze structured reactor for biogas exhaust removal is proposed and model based calculations are performed to compare the wire gauze catalytic reactor with the classic monolith. The modelling bases on kinetic data experimentally obtained in a small-scale tubular reactor for cobalt and palladium (as reference) oxide catalysts doped with promoters (Ce, Pd). The heat and mass transfer characteristics of the wire gauze reactor are taken from the former studies by the authors. The simulations show that for assumed reactor parameters, a combination of the promoted cobalt oxide catalyst and the wire gauze support can give high conversion of methane and carbon monoxide. Keywords

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The deposition of γ-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts

Cited by 254 publications

References 4 publications

Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

NOx Storage and Reduction for Diesel Engine Exhaust Aftertreatment

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

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