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| rdf:type
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| Description
| - Two different types of layered MWW zeolite, i.e., delaminated MCM-56 and multilayer MCM-22P, have been studied for swelling using a new surfactant/tetraalkylammonium combination as the swelling reagent. The commonly used in the past tetrapropylammonium hydroxide (TPA-OH) was replaced by its tetramethylammonium (TMA-OH) homologue. The latter was previously considered unsuitable for use in swelling of MCM-22P. The extent of swelling with different amounts of TMA-OH accompanying surfactant was determined first by X-ray diffraction. Selected samples were pillared with silica and evaluated quantitatively by nitrogen sorption at 77 K and FTIR. The swelling of MCM-56, which is reported in detail for the first time, has been found to be more facile and extensive compared to the multi-layer MCM-22P, consistent with its delaminated nature. BET surface areas of pillared MCM-56 samples increase with the amount of hydroxide used for swelling and approach 700 m(2)/g. Pillared MCM-22P show similar trend but have somewhat lower BET values than pillared MCM-56. The observed successful swelling of MCM-22P is notable because the presence of small cations was previously found to be unfavorable for this process. FTIR measurements of selected samples confirmed higher Al/acid center content in pillared MCM-56 products in comparison to MCM-22 ones. Compared to unmodified MCM-22, there was an increase in most cases in the concentration of acid sites interacting with di-tert-butyl-pyridine. This confirms increased access of larger molecules to acid sites, which is the main goal of such swelling/pillaring treatments.
- Two different types of layered MWW zeolite, i.e., delaminated MCM-56 and multilayer MCM-22P, have been studied for swelling using a new surfactant/tetraalkylammonium combination as the swelling reagent. The commonly used in the past tetrapropylammonium hydroxide (TPA-OH) was replaced by its tetramethylammonium (TMA-OH) homologue. The latter was previously considered unsuitable for use in swelling of MCM-22P. The extent of swelling with different amounts of TMA-OH accompanying surfactant was determined first by X-ray diffraction. Selected samples were pillared with silica and evaluated quantitatively by nitrogen sorption at 77 K and FTIR. The swelling of MCM-56, which is reported in detail for the first time, has been found to be more facile and extensive compared to the multi-layer MCM-22P, consistent with its delaminated nature. BET surface areas of pillared MCM-56 samples increase with the amount of hydroxide used for swelling and approach 700 m(2)/g. Pillared MCM-22P show similar trend but have somewhat lower BET values than pillared MCM-56. The observed successful swelling of MCM-22P is notable because the presence of small cations was previously found to be unfavorable for this process. FTIR measurements of selected samples confirmed higher Al/acid center content in pillared MCM-56 products in comparison to MCM-22 ones. Compared to unmodified MCM-22, there was an increase in most cases in the concentration of acid sites interacting with di-tert-butyl-pyridine. This confirms increased access of larger molecules to acid sites, which is the main goal of such swelling/pillaring treatments. (en)
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| Title
| - Swelling of MCM-56 and MCM-22P with a new medium - surfactant-tetramethylammonium hydroxide mixtures
- Swelling of MCM-56 and MCM-22P with a new medium - surfactant-tetramethylammonium hydroxide mixtures (en)
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| skos:prefLabel
| - Swelling of MCM-56 and MCM-22P with a new medium - surfactant-tetramethylammonium hydroxide mixtures
- Swelling of MCM-56 and MCM-22P with a new medium - surfactant-tetramethylammonium hydroxide mixtures (en)
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| skos:notation
| - RIV/61388955:_____/13:00422067!RIV14-GA0-61388955
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - I, P(GA203/08/0604), P(GAP106/11/0819)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/61388955:_____/13:00422067
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - delaminated zeolite; MCM-56; MCM-22P (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| |
| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Kubů, Martin
- Chlubná, Pavla
- Roth, Wieslaw Jerzy
- Vitvarová, Dana
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| http://linked.open...ain/vavai/riv/wos
| |
| issn
| |
| number of pages
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| http://bibframe.org/vocab/doi
| - 10.1016/j.cattod.2012.07.040
|
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