Transient behaviour of catalytic monolith with NO  storage capacity

Kočí, Petr; Schejbal, M.; Trdlicka, Jan; Gregor, Tomáš; Kubı́ček, Milan; Marek, M.

doi:10.1016/j.cattod.2006.08.014

Cited by 46 publications

(12 citation statements)

References 25 publications

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“…Monoliths display great potential as versatile functional material for applications such as separation media (Urban, Svec, & Fréchet, 2010a, 2010b, enzyme immobilization (Benčina, Benčina,Štrancar, & Podgornik, 2005;Kato, Inuzuka, Sakai-Kato, & Toyo'oka, 2005;Pierre et al, 2006;Svec, 2006), chromatography (Urban et al, 2010b), ion-exchange (Lubbad, Bandari, & Buchmeiser, 2011;Nandi, Okada, & Uyama, 2011), and catalysis (Kočí et al, 2007;Tomašić, 2007). These applications rely on the unique properties of monoliths, such as their high permeability, high stability, and ease of chemical modification.…”

Section: Introductionmentioning

confidence: 98%

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Wang

Xin

Uyama

2015

Carbohydrate Polymers

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Section: Introductionmentioning

confidence: 98%

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Wang

Xin

Uyama

2015

Carbohydrate Polymers

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“…Due to their high permeability, fast mass transfer performance, high stability, and easy chemical modification, monoliths have drawn considerable attention in applications such as separation media [7,8], enzyme immobilization [9][10][11][12], chromatography [8], ionexchange [13,14], and catalysis [15][16][17]. Recently, we have developed a new method to fabricate polymeric monoliths from the corresponding polymer solutions by thermally induced phase separation (TIPS) or non-solvent induced phase separation.…”

Section: Introductionmentioning

confidence: 99%

Reactive poly(ethylene-co-vinyl alcohol) monoliths with tunable pore morphology for enzyme immobilization

Wang

Uyama

2015

Colloid Polym Sci

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Poly(ethylene-co-vinyl alcohol) (EVOH) monoliths were fabricated from two kinds of EVOH with different ethylene contents by thermally induced phase separation (TIPS) technique using a mixed solvent of isopropanol (IPA) and water. The pore and skeleton sizes could be controlled by changing the fabrication parameters such as the concentration of the polymer, the ratio of IPA and water, and the cooling temperature. The EVOH monoliths possessed relatively high specific surface area and uniform mesopore structure. Furthermore, the monolith was applied for a support matrix of enzyme immobilization. The monolith was successfully activated by carbonyldiimidazole and subsequently reacted with urease. The good reusability of the urease-immobilized monolith was demonstrated. The present EVOH monoliths have good hydrophilicity and reactive hydroxyl groups; therefore, it possesses large potential for various bio-related applications such as enzyme immobilization and protein purification.

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“…This paper focuses on the modelling of NO X storage over an LNT. Various different models for NO X storage have been published, including: Simple models where the rate of storage is proportional to the fraction of available sites or the fraction of available sites squared Models including nitrate formation and decomposition with rates dependant on the fraction of vacant sites and on the fraction of occupied sites (possibly raised to a power), respectively …”

Section: Introductionmentioning

confidence: 99%

“…In some models only NO 2 stores with NO needing to be oxidised to NO 2 before it can store, while in others direct storage of NO occurs as well; some studies have even lumped NO and NO 2 storage together …”

Section: Introductionmentioning

confidence: 99%

Comparison of different kinetic models for NO_X storage on a lean NO_X trap

2014

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The kinetics of NOX storage on a lean NOX trap (LNT) were studied using NOX breakthrough curves measured with a laboratory reactor. A much wider range of temperatures (125–450°C) was used than in most studies to facilitate discrimination between potential models. The breakthrough curves were run until the LNT was saturated to (i) enable NO oxidation to NO2 to be studied in the absence of NOX storage, (ii) to enable the effective NOX capacity as a function of temperature to be determined, and (iii) to provide a more demanding test for potential models. Breakthrough curves for 125 and 450°C were very similar, while curves at intermediate temperatures initially followed that for 125°C before breaking away from this curve at a point that became earlier with increasing temperature. Thus, the breakthrough curves have a temperature independent initial portion, followed by a temperature dependant portion. This was explained by there being two types of site: fast sites and slow sites. Fast sites are responsible for the initial part of the curve; both the rate of storage on these sites and the available capacity are independent of temperature. The rate of storage on slow sites, on the other hand, is temperature dependant, as is the available storage capacity. Slow sites are more abundant than fast sites. The performance of three NOX storage models for these sites was compared. The amount of NOX stored as a function of temperature was bell‐shaped. The models naturally predicted that storage was limited by kinetics at lower temperatures and nitrate stability at higher temperatures.

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Transient behaviour of catalytic monolith with NO storage capacity

Cited by 46 publications

References 25 publications

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Reactive poly(ethylene-co-vinyl alcohol) monoliths with tunable pore morphology for enzyme immobilization

Comparison of different kinetic models for NO_X storage on a lean NO_X trap

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Transient behaviour of catalytic monolith with NO storage capacity

Cited by 46 publications

References 25 publications

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Facile fabrication of mesoporous poly(ethylene- co -vinyl alcohol)/chitosan blend monoliths

Reactive poly(ethylene-co-vinyl alcohol) monoliths with tunable pore morphology for enzyme immobilization

Comparison of different kinetic models for NOX storage on a lean NOX trap

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Comparison of different kinetic models for NO_X storage on a lean NO_X trap