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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10134296%21RIV14-MSM-11310___
rdf:type
skos:Concept n8:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1166/apm.2013.1011
dcterms:description
The possibility to modify the acidic properties of extra-large pore UTL zeolite, possessing unique two-dimensional 14- and 12-ring pore system, was evidenced. Acid strength increases in order B-UTL<Fe-UTL<Ga-UTL<Al-UTL and the concentration of Bronsted acid centers in Al-, Ga-, and Fe-UTL frameworks could be adjusted by changing the pH value of the initial gel. The acidic properties of isomorphously substituted UTL zeolites with different heteroelements (B, Al, Ga, Fe) in the framework, were investigated using FTIR of adsorbed pyridine, ammonia temperature programmed desorption (TPD of NH3 and Hammett indicator method. Pure germanosilicate UTL zeolites contain two types of acid centers: (i) weak silanol and germanol groups with strength 48<H0 < 68 (characterized by the band at 1446 cmMINUS SIGN 1 in IR spectra of adsorbed pyridine and by desorption peak at 180 C in TPD of NH3 and (ii) Lewis acid centers attributed to 4-coordinated Ge with strength MINUS SIGN 82 < H0 < MINUS SIGN 56 (characterized by the band at 1452 cmMINUS SIGN 1 in pyridine IR and by the desorption peak at 350 C in NH3 TPD). Introduction of B, Al, Ga and Fe into UTL framework leads to the formation of Bronsted acid sites (band at 1542 cmMINUS SIGN 1 in the IR spectra of adsorbed pyridine and additional desorption peaks in the range of 250-490 C in NH3 TPD). The possibility to modify the acidic properties of extra-large pore UTL zeolite, possessing unique two-dimensional 14- and 12-ring pore system, was evidenced. Acid strength increases in order B-UTL<Fe-UTL<Ga-UTL<Al-UTL and the concentration of Bronsted acid centers in Al-, Ga-, and Fe-UTL frameworks could be adjusted by changing the pH value of the initial gel. The acidic properties of isomorphously substituted UTL zeolites with different heteroelements (B, Al, Ga, Fe) in the framework, were investigated using FTIR of adsorbed pyridine, ammonia temperature programmed desorption (TPD of NH3 and Hammett indicator method. Pure germanosilicate UTL zeolites contain two types of acid centers: (i) weak silanol and germanol groups with strength 48<H0 < 68 (characterized by the band at 1446 cmMINUS SIGN 1 in IR spectra of adsorbed pyridine and by desorption peak at 180 C in TPD of NH3 and (ii) Lewis acid centers attributed to 4-coordinated Ge with strength MINUS SIGN 82 < H0 < MINUS SIGN 56 (characterized by the band at 1452 cmMINUS SIGN 1 in pyridine IR and by the desorption peak at 350 C in NH3 TPD). Introduction of B, Al, Ga and Fe into UTL framework leads to the formation of Bronsted acid sites (band at 1542 cmMINUS SIGN 1 in the IR spectra of adsorbed pyridine and additional desorption peaks in the range of 250-490 C in NH3 TPD).
dcterms:title
The Effect of Synthesis Conditions and Nature of Heteroelement on Acidic Properties of Isomorphously Substituted UTL Zeolites The Effect of Synthesis Conditions and Nature of Heteroelement on Acidic Properties of Isomorphously Substituted UTL Zeolites
skos:prefLabel
The Effect of Synthesis Conditions and Nature of Heteroelement on Acidic Properties of Isomorphously Substituted UTL Zeolites The Effect of Synthesis Conditions and Nature of Heteroelement on Acidic Properties of Isomorphously Substituted UTL Zeolites
skos:notation
RIV/00216208:11310/13:10134296!RIV14-MSM-11310___
n8:predkladatel
n18:orjk%3A11310
n3:aktivita
n10:I n10:P
n3:aktivity
I, P(GAP106/11/0819), P(GBP106/12/G015)
n3:cisloPeriodika
1
n3:dodaniDat
n7:2014
n3:domaciTvurceVysledku
n20:1747681
n3:druhVysledku
n17:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n21:predkladatel
n3:idSjednocenehoVysledku
71763
n3:idVysledku
RIV/00216208:11310/13:10134296
n3:jazykVysledku
n5:eng
n3:klicovaSlova
Bronsted and Lewis acidity; isomorphous substitution; extra-large pore zeolite
n3:klicoveSlovo
n9:Bronsted%20and%20Lewis%20acidity n9:isomorphous%20substitution n9:extra-large%20pore%20zeolite
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[47BC3A45C582]
n3:nazevZdroje
ADVANCED POROUS MATERIALS
n3:obor
n15:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:projekt
n11:GBP106%2F12%2FG015 n11:GAP106%2F11%2F0819
n3:rokUplatneniVysledku
n7:2013
n3:svazekPeriodika
1
n3:tvurceVysledku
Čejka, Jiří Shamzhy, Mariya Procházková, Dana Shvets, Oleksiy V. Nachtigall, Petr Opanasenko, Maksym V.
s:issn
2327-3941
s:numberOfPages
11
n13:doi
10.1166/apm.2013.1011
n14:organizacniJednotka
11310