Catalytic activity and acidity of Al pillared clays and zeolites in different hydrocarbon reactions

Kürschner, U.; Seefeld, V.; Parlitz, B.; Geßner, W.; Lieske, H.

doi:10.1007/bf02475310

Cited by 6 publications

(6 citation statements)

References 5 publications

(6 reference statements)

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“…also reported the higher yields of liquid product obtained with an Al-pillared clay compared with that obtained with a highly acidic zeolite [ 54 ]. Other comparative studies between Al-pillared clays and zeolites also showed a lower cracking activity of the pillared clay although both types of catalysts are equally active in more facile secondary reactions as a consequence of weakly acidic Lewis sites obviously present on pillared clays as well as on zeolites [ 55 ]. High acidity can also promote a higher extent of secondary reactions leading to the formation of carbon deposits on the catalyst surface with its consequent deactivation [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Catalytic assessment of solid materials for the pyrolytic conversion of low-density polyethylene into fuels

Olivera¹,

Musso²,

León³

et al. 2020

Heliyon

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Pyrolysis techniques provide an interesting way of recycling plastic wastes (PW) by transforming them into liquid fuels with high calorific values. Catalysts are employed in PW pyrolysis in order to favor cracking reactions; in that regard, cheap and abundant natural resources are being investigated as potential catalyst precursors. This article explores the pyrolysis of low-density polyethylene (LDPE) in a semibatch reactor under a reduced pressure of 300 torr and temperatures in the range of 370 °C–430 °C. Three different solid materials, an activated carbon (AC1), a commercial Fluid cracking catalyst (FCC) and an aluminum- pillared clay (Al-PILC), were tested as catalysts for the pyrolysis process. Thermogravimetric analyzes were previously performed to select the most catalytically active materials. AC1 displayed very low catalytic activity while FCC and Al-PILC displayed high activity and conversion to liquid products. Hydrocarbons ranging from C5 to C28 were identified in the liquid products as well as significant changes in their composition when FCC and Al-PILC catalyst were used. Differences in the catalytic activity of the 3 solid materials are ascribed mainly to differences in their acid properties.

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Section: Resultsmentioning

confidence: 99%

Catalytic assessment of solid materials for the pyrolytic conversion of low-density polyethylene into fuels

Olivera¹,

Musso²,

León³

et al. 2020

Heliyon

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“…They have aluminosilicate frame work structure with three dimensional channels possessing acid sites having potential applications in industrial organic transformations. [1][2][3][4] Clays are aluminosilicates having two dimensional layered structures with stacked frame work arrangement. In clays, such as montmorillonite, negative charge on the layer arises because of isomorphous replacement of structural Al with divalent Mg and Fe ions.…”

Section: Introductionmentioning

confidence: 99%

“…Cations such as Na, Ca and Mg occupy the clay interlayer and neutralize the negative charge. 1,3,5,6 Montmorillonite upon acid treatment undergoes dealumination and forms H + /Al-exchanged clay, an acid catalyst. There are reports in the literature that treatment of montmorillonite with organic acids generates pores on the surface caused by voids due to controlled dealumination in the octahedral layer.…”

Section: Introductionmentioning

confidence: 99%

“…Recently researchers have been exploring the possibility of using environmentally benign catalysts for alkylation [3][4][5]30 . In this context, alkylation of p-cresol has been studied using environmentally friendly catalysts such as zeolites and clays, wherein the main acidity of the zeolites occur within their pores and in the interlayer region for the clay minerals.…”

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confidence: 99%

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Re-usability of zeolites and modified clays for alkylation of cyclohexanol a contrast study

2015

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Organic sulfonic acid treatment of montmorillonite results in micro-pores on the surface of modified clays providing access to acid sites in the interlayer. Performance of modified clay catalysts for alkylation of para-cresol with cyclohexanol were compared with microporous zeolites. Phenoldisulfonic acid treated clay catalyst showed maximum activity comparable with that of beta-zeolite. Modified clay-and zeolitecatalysts on reuse for the alkylation exhibited different behaviour. Modified clays showed same activity as in the first cycle while zeolites showed significantly reduced catalytic activities on reuse. Differences in behaviour were further investigated by characterizing the reused samples with TGA, acidity and surface measurements. Used zeolite samples showed considerable variations in acidity, surface characteristics and TGA pattern, which was attributed to the formation of coke. Absence of coke in clays and deposition of coke in zeolites is attributed to difference in their pore architecture.

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“…In Böden sind sie ubiquitär als Montmorillonite weit verbreitet. Aufgrund dieser Merkmale stellt die Gruppe der Smektite bereits seit Beginn der 70er Jahre eine immer wieder im Hinblick auf katalytische Interaktionen untersuchte anorganische Komponente des heterogenen Mediums Boden dar (ADAMS et al 1983, BAL-LANTINE et al 1983, FRIPIAT & CRUZ-CUMPLIDO 1974, KÜRSCHNER et al 1998, MORTLAND 1970, MORTLAND 1980, OCCELLI 1987, PINNAVAIA 1983. Die reaktiven Fähigkeiten dieser Tonmineralgruppe sind das Resultat einer extrem kleinen Kristallgröße, von Variationen in der internen chemischen Zusammensetzung, einer hohen Kationenaustauschkapazität, einer großen chemisch aktiven Oberfläche, von Variationen der austauschbaren Kationen und der Oberflächenladung, sowie von Interaktionen mit anorganischen und organischen Verbindungen.…”

Section: Smektite Als Reaktive Tonmineralgruppeunclassified

Transformation organischer Schadstoffe und abiotische Bildung von Huminstoffen in Böden durch oberflächeninduzierte Reaktionen an Tonmineralen

Birkel¹

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Diese Dissertation entstand im Rahmen des Teilprojektes A6 "Grenzflächenreaktivität, Aufbau und Zerfall von Mikroaggregaten" des von der Deutschen Forschungsgemeinschaft geförderten Sonderforschungsbereiches 468 "Wechselwirkungen an geologischen Grenzflächen" und des Projektes"Aufbau und Zerfall von Bodenaggregaten, Reaktivität von Bodenmineralen an der Grenzfläche Mineral-Porenraum" (DFG-Fördernummer GE 431/14-1). Der Deutschen Forschungsgemeinschaft sei für die finanzielle Unterstützung gedankt.Ich danke Herrn Prof. Dr. Gerhard Gerold für die Vergabe dieses Themas, den freien Raum, den er mir zur eigenen Schwerpunktsetzung ließ und für seine umfassende Unterstützung.Herrn PD Dr. Jürgen Niemeyer sei vielmals gedankt für anregende Diskussionen und die Übernahme des Korreferates.Für die Unterstützung bei den zahlreichen Analysen und die Bereitstellung der Geräte seien

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Catalytic activity and acidity of Al pillared clays and zeolites in different hydrocarbon reactions

Cited by 6 publications

References 5 publications

Catalytic assessment of solid materials for the pyrolytic conversion of low-density polyethylene into fuels

Catalytic assessment of solid materials for the pyrolytic conversion of low-density polyethylene into fuels

Re-usability of zeolites and modified clays for alkylation of cyclohexanol a contrast study

Transformation organischer Schadstoffe und abiotische Bildung von Huminstoffen in Böden durch oberflächeninduzierte Reaktionen an Tonmineralen

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