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Statements

Subject Item
n2:RIV%2F62243136%3A_____%2F14%3AGACR06CL%21RIV15-GA0-62243136
rdf:type
n14:Vysledek skos:Concept
rdfs:seeAlso
http://pubs.rsc.org/en/content/articlelanding/2014/dt/c4dt00184b#!divAbstract
dcterms:description
MWW family of different structural types (MCM-22, MCM-49, MCM-56 and MCM-36) was used as catalysts for aldol condensation of furfural and acetone studied in a batch reactor at 100 °C, autogenous pressure and a reaction time of 0–4 h. To establish a relation between physico-chemical and catalytic properties of microporous materials, the samples were characterized by XRD, SEM, N2 adsorption, FTIR and TGA. It was found that the acidic solids possessed appreciable activity in the reaction and resulted in the formation of products of aldehyde–ketone interaction. Surprisingly, MCM-22 and MCM-49, i.e. three-dimensional materials containing internal supercages, exhibited higher activity than two MCM-36 catalysts with two-dimensional character having larger accessible external surface area due to expansion of the interlayer space by swelling and pillaring treatments. Moreover, all MWW family catalysts gave higher conversion than the large-pore zeolite BEA. Nevertheless, furfural conversion decreased rapidly for all the studied materials due to coke formation. Unexpectedly, the deactivation was found to be more severe for MCM-36 catalysts than for MCM-22 and MCM-49, which was attributed to the reaction taking place also in supercages that are protected by 10-ring channels from severe coking. In contrast the cups located on the external surface were coked rapidly. MWW family of different structural types (MCM-22, MCM-49, MCM-56 and MCM-36) was used as catalysts for aldol condensation of furfural and acetone studied in a batch reactor at 100 °C, autogenous pressure and a reaction time of 0–4 h. To establish a relation between physico-chemical and catalytic properties of microporous materials, the samples were characterized by XRD, SEM, N2 adsorption, FTIR and TGA. It was found that the acidic solids possessed appreciable activity in the reaction and resulted in the formation of products of aldehyde–ketone interaction. Surprisingly, MCM-22 and MCM-49, i.e. three-dimensional materials containing internal supercages, exhibited higher activity than two MCM-36 catalysts with two-dimensional character having larger accessible external surface area due to expansion of the interlayer space by swelling and pillaring treatments. Moreover, all MWW family catalysts gave higher conversion than the large-pore zeolite BEA. Nevertheless, furfural conversion decreased rapidly for all the studied materials due to coke formation. Unexpectedly, the deactivation was found to be more severe for MCM-36 catalysts than for MCM-22 and MCM-49, which was attributed to the reaction taking place also in supercages that are protected by 10-ring channels from severe coking. In contrast the cups located on the external surface were coked rapidly. MWW family of different structural types (MCM-22, MCM-49, MCM-56 and MCM-36) was used as catalysts for aldol condensation of furfural and acetone studied in a batch reactor at 100 °C, autogenous pressure and a reaction time of 0–4 h. To establish a relation between physico-chemical and catalytic properties of microporous materials, the samples were characterized by XRD, SEM, N2 adsorption, FTIR and TGA. It was found that the acidic solids possessed appreciable activity in the reaction and resulted in the formation of products of aldehyde–ketone interaction. Surprisingly, MCM-22 and MCM-49, i.e. three-dimensional materials containing internal supercages, exhibited higher activity than two MCM-36 catalysts with two-dimensional character having larger accessible external surface area due to expansion of the interlayer space by swelling and pillaring treatments. Moreover, all MWW family catalysts gave higher conversion than the large-pore zeolite BEA. Nevertheless, furfural conversion decreased rapidly for all the studied materials due to coke formation. Unexpectedly, the deactivation was found to be more severe for MCM-36 catalysts than for MCM-22 and MCM-49, which was attributed to the reaction taking place also in supercages that are protected by 10-ring channels from severe coking. In contrast the cups located on the external surface were coked rapidly.
dcterms:title
Peculiar behavior of MWW materials in aldol condensation of furfural and acetone Peculiar behavior of MWW materials in aldol condensation of furfural and acetone Peculiar behavior of MWW materials in aldol condensation of furfural and acetone
skos:prefLabel
Peculiar behavior of MWW materials in aldol condensation of furfural and acetone Peculiar behavior of MWW materials in aldol condensation of furfural and acetone Peculiar behavior of MWW materials in aldol condensation of furfural and acetone
skos:notation
RIV/62243136:_____/14:GACR06CL!RIV15-GA0-62243136
n4:aktivita
n9:I n9:P
n4:aktivity
I, P(ED2.1.00/03.0071), P(GBP106/12/G015)
n4:cisloPeriodika
43
n4:dodaniDat
n18:2015
n4:domaciTvurceVysledku
n10:8756015 n10:4311671 Kikhtyanin, Oleg
n4:druhVysledku
n16:J
n4:duvernostUdaju
n7:S
n4:entitaPredkladatele
n11:predkladatel
n4:idSjednocenehoVysledku
36014
n4:idVysledku
RIV/62243136:_____/14:GACR06CL
n4:jazykVysledku
n5:cze
n4:klicovaSlova
aldol condensation, furfural, acetone, zeolite
n4:klicoveSlovo
n12:furfural n12:acetone n12:aldol%20condensation n12:zeolite
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[2387D892C2E2]
n4:nazevZdroje
Dalton Transaction
n4:obor
n17:CC
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
4
n4:projekt
n13:ED2.1.00%2F03.0071 n13:GBP106%2F12%2FG015
n4:rokUplatneniVysledku
n18:2014
n4:tvurceVysledku
Chlubná, Pavla Kikhtyanin, Oleg Kubička, David Jindrová, Tereza
n4:wos
000338117200035
s:issn
1477-9226
s:numberOfPages
14
n8:doi
10.1039/C4DT00184B