Extruded monolithic catalyst supports

Lachman, I. M.; Williams, Jake Ryland

doi:10.1016/0920-5861(92)80032-i

Cited by 54 publications

(29 citation statements)

References 5 publications

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“…A more detailed explanation of the processes involved in extrudation and corrugation of ceramic monoliths has been reported by Avila et al [1]. Additional preparative methods for ceramic monoliths are available in the patent literature [42,[45][46][47][48][49], as well as in reviews on cordierite monolithic catalysts by De Luca and Campbell [50] and Lachman et al [51][52][53][54]. Also, detailed rheological characterization of pastes for extruding ceramic monoliths have been reported by Forzatti et al [9].…”

Section: Ceramic Monolithsmentioning

confidence: 99%

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: Ceramic Monolithsmentioning

confidence: 99%

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

2017

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“…A higher cell density implies a higher geometric surface area but also more complex manufacturing and washcoating procedures as well as higher pressure drops [82]. Monolith substrates used in automotive applications generally have square channels with a cell density of 300-600 cpsi [86,87]. More than 90% are made of cordierite (2MgO·2Al 2 O 3 ·5SiO 2 ) [83], which offers high mechanical strength, very low thermal expansion coefficient and resistance to high temperatures and thermal shocks [82,85,86].…”

Section: Preparation Of Structured Catalystsmentioning

confidence: 99%

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains a critical research topic owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals. Among other material classes, perovskite-type oxides are known to be valuable alternatives to conventionally used TWC compositions and have demonstrated to be suitable for a wide range of automotive applications, ranging from TWC to Diesel Oxidation Catalysts (DOC), from NO x Storage Reduction catalysts (NSR) to soot combustion catalysts. The interest in these catalysts has been revitalized in the past ten years by the introduction of the concept of catalyst regenerability of perovskite-based TWC, which is in principle well applicable to other catalytic processes as well, and by the possibility to reduce the amounts of critical elements, such as precious metals without seriously lowering the catalytic performance. The aim of this review is to show that perovskite-type oxides have the potential to fulfil the requirements (high activity, stability, and possibility to be included into structured catalysts) for implementation in TWC.

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“…A general overview about characteristics, fabrication, and typical applications can be found in Williams (2001), Garcia-Bordeje et al (2002), andGulati (1998). A previous work by Lachman and Williams (1992) also gives a good introduction to monolith production, raw materials, and its application in catalytic twophase processes.…”

Section: Monolith Structurementioning

confidence: 97%