Alumina washcoating and metal deposition of ceramic monoliths

Xu, Xianzhu; Vonk, H.; Cybulski, Andrzej; Moulijn, Jacob A.

doi:10.1016/s0167-2991(06)81850-1

Cited by 16 publications

(9 citation statements)

References 3 publications

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“…A more detailed description of the sol-gel process is provided by Schmidt [103]. Furthermore, Xiaoding et al reported a study of sol-gel coating of monoliths via three types of aluminium sols, namely pseudoboehmite with urea and nitric acid, hydrolysis of aluminium chloride and aluminium powder, and hydrolysis of tri-sec-butoxide aluminium [10]. It was concluded that sols prepared via pseudoboehmite with urea and nitric acid and hydrolysis of tri-sec-butoxide are most suitable for sol-gel alumina coating of monoliths [10].…”

Section: Sol-gelmentioning

confidence: 99%

“…Furthermore, Xiaoding et al reported a study of sol-gel coating of monoliths via three types of aluminium sols, namely pseudoboehmite with urea and nitric acid, hydrolysis of aluminium chloride and aluminium powder, and hydrolysis of tri-sec-butoxide aluminium [10]. It was concluded that sols prepared via pseudoboehmite with urea and nitric acid and hydrolysis of tri-sec-butoxide are most suitable for sol-gel alumina coating of monoliths [10]. A typical sol-gel method of coating involves dipping the monolith in a sol from pseudoboehmite, urea and 0.3 M nitric acid in a weight ratio of 2:1:5, followed by emptying the channels, drying and finally calcination [104].…”

Section: Sol-gelmentioning

confidence: 99%

“…In addition, there are some informative reviews on coating monolith structures [10][11][12]. Also crucial to the preparation of monolithic catalysts can be transport phenomena [13].…”

Section: Introductionmentioning

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: Sol-gelmentioning

confidence: 99%

Section: Sol-gelmentioning

confidence: 99%

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

2017

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“…Several coating methods to deposit catalysts onto structured substrates were reviewed by Meille [17]. Briefly, they include suspension sedimentation [18][19][20], sol-gel synthesis [21][22][23][24], a hybrid sol-gel method with additional pre-processing or post-processing steps [25,26], and electrochemical sedimentation [27]. The addition of active metals is often performed by an additional impregnation step followed by calcination [28,29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Thin Titania Coatings onto the Inner Surface of Quartz Tubes and Their Photoactivity in Decomposition of Methylene Blue and Rhodamine B

et al. 2021

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An evaporation-deposition coating method for coating the inner surface of long (>1 m) quartz tubes of small diameter has been studied by the introduction of two-phase (gas-liquid) flow with the gas core flowing in the middle and a thin liquid film of synthesis sol flowing near the hot tube wall. The operational window for the deposition of continuous titania coatings has been obtained. The temperature range for the deposition of continuous titania coatings is limited to 105–120 °C and the gas flow rate is limited to the range of 0.4–1.0 L min−1. The liquid flow rate in the annular flow regime allows to control the coating thickness between 3 and 10 micron and the coating porosity between 10% and 20%. By increasing the liquid flow rate, the coating porosity can be substantially reduced. The coatings were characterized by X-ray diffraction, N2 chemisorption, thermogravimetric analysis, and scanning electron microscopy. The coatings were tested in the photocatalytic decomposition of methylene blue and rhodamine B under UV-light and their activity was similar to that of a commercial P25 titania catalyst.

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“…The most widely used strategy to deposit a catalyst powder on a monolith substrate is the washcoating (or dip-coating) method in which a thin catalytic layer is formed [15]. The coated layer must be homogeneous with the desired catalyst loading and proper adherence to the substrate.…”

Section: Introductionmentioning

confidence: 99%

Does shaping catalysts modify active phase sites? A comprehensive in situ FTIR spectroscopic study on the performance of a model Ru/Al2O3 catalyst for the CO methanation

Bobadilla

Muñoz‐Murillo

Laguna

et al. 2019

Chemical Engineering Journal

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Alumina washcoating and metal deposition of ceramic monoliths

Cited by 16 publications

References 3 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

Synthesis of Thin Titania Coatings onto the Inner Surface of Quartz Tubes and Their Photoactivity in Decomposition of Methylene Blue and Rhodamine B

Does shaping catalysts modify active phase sites? A comprehensive in situ FTIR spectroscopic study on the performance of a model Ru/Al2O3 catalyst for the CO methanation

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