Washcoating of γ-alumina on stainless steel microchannels

Peela, Nageswara Rao; Mubayi, Anamika; Kunzru, Deepak

doi:10.1016/j.cattod.2009.07.026

Cited by 62 publications

(52 citation statements)

References 17 publications

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“…Peela et al [51] also studied the effect of slurry concentration, slurry pH, and binders on the washcoat characteristics. The washcoat loading increased almost linearly with slurry concentration.…”

Section: Deposition Of Catalysts In Microchannelsmentioning

confidence: 97%

“…Peela et al [51] studied the effect of primer and slurry composition on the washcoat characteristics of "-alumina on stainless steel substrate. Washcoating was done following a two-step procedure: primer coating followed by slurry coating.…”

Section: Deposition Of Catalysts In Microchannelsmentioning

confidence: 99%

“…Another pretreatment method is to oxidize the substrates with acids such as HCl or HNO 3 [71]. For aluminum-free substrate, a primer coating of a sol can also be used to form a thin layer of alumina that can enhance the adherence of the subsequent washcoat [18,51].…”

Section: Deposition Of Catalysts In Microchannelsmentioning

confidence: 99%

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Microstructured Reactors for Hydrogen Production from Ethanol

Peela

Kunzru

2015

Springer Tracts in Mechanical Engineering

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The continuously increasing demand for clean and renewable energy warrants the development of renewable, nonpolluting energy resources. Hydrogen is emerging as a natural choice as a more secure and cleaner energy carrier. Fuel cells can be used to produce clean energy from hydrogen, particularly for portable applications. Hydrogen can be produced from a variety of fossil fuel sources, but to decrease the dependence on fossil fuels, hydrogen has to be produced from a renewable source. Hydrogen production from steam reforming of ethanol (a renewable fuel) has emerged as a promising alternative in recent years. For conducting this reaction on board a vehicle, a compact reactor system is required. A microchannel reactor is more efficient and attractive for this purpose, because of the high surface to volume ratio, resulting in high heat and mass transfer rates.The reactions involved in producing CO-free hydrogen from ethanol include steam reforming of ethanol, water-gas shift reaction, and preferential oxidation of carbon monoxide. This chapter discusses the steps involved in the development of a microfuel processor for producing hydrogen from ethanol that include fabrication of the microchannels on the metal substrate, coating of the catalyst and support on the microchannels, assembly of the microchannel reactor, optimization of the catalysts for the three reactions, and, finally, heat integration of the different processes to maximize the efficiency of the fuel processor.

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Section: Deposition Of Catalysts In Microchannelsmentioning

confidence: 97%

Section: Deposition Of Catalysts In Microchannelsmentioning

confidence: 99%

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Microstructured Reactors for Hydrogen Production from Ethanol

Peela

Kunzru

2015

Springer Tracts in Mechanical Engineering

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“…However, wash-coating is also well-suited for catalyst deposition on the plates of stainless steel or aluminum plate heatexchangers as described by previous papers [36][37][38][39][40]. However, wash-coating is also well-suited for catalyst deposition on the plates of stainless steel or aluminum plate heatexchangers as described by previous papers [36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…Metal oxide layers formed on top of the passivation layer [43] on stainless steel during treatment at elevated temperature have similar effects. Another way of improving the adhesion of catalyst coating is the deposition of a boehmite slurry onto stainless steel or silicon [44] substrates, also named primer which is only a few lm thick [39].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Wash‐Coating Slurries as Catalyst Carrier for Screen Printing into Microstructured Reactors

et al. 2013

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A screen printing procedure was developed to deposit catalyst coatings into microchannels by wash-coating through a low-cost technique suited for mass production. The composition of the suspension was optimized regarding the choice of solvent, binder, and additive so as to achieve both optimum rheological properties for screen printing and catalyst adhesion. The feasibility of screen printing catalysts into arrays of plates carrying microchannels was demonstrated and the long-term durability of the catalytic performance of the screen-printed coatings was proven experimentally.

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

Zhang

2019

ChemistrySelect

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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.

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Washcoating of γ-alumina on stainless steel microchannels

Cited by 62 publications

References 17 publications

Microstructured Reactors for Hydrogen Production from Ethanol

Microstructured Reactors for Hydrogen Production from Ethanol

Optimization of Wash‐Coating Slurries as Catalyst Carrier for Screen Printing into Microstructured Reactors

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

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