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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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A large sample volume magic angle spinning nuclear magnetic resonance probe for in situ investigations with constant flow of reactants

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dc.contributor.author Hu, Jian Zhi ko
dc.contributor.author Sears, Jesse A. ko
dc.contributor.author Mehta, Hardeep S. ko
dc.contributor.author Ford, Joseph J. ko
dc.contributor.author Kwak, Jahun ko
dc.contributor.author Zhu, Kake ko
dc.contributor.author Wang, Yong ko
dc.contributor.author Liu, Jun ko
dc.contributor.author Hoyt, David W. ko
dc.contributor.author Peden, Charles H. F. ko
dc.date.available 2015-07-17T08:43:56Z -
dc.date.created 2015-07-17 ko
dc.date.issued 2012-02 -
dc.identifier.citation PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.14, no.7, pp.2137 - 2143 ko
dc.identifier.issn 1463-9076 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12188 -
dc.identifier.uri http://pubs.rsc.org/en/Content/ArticleLanding/2012/CP/C1CP22692D#!divAbstract ko
dc.description.abstract A large-sample-volume constant-flow magic angle sample spinning (CF-MAS) NMR probe is reported for in situ studies of the reaction dynamics, stable intermediates/transition states, and mechanisms of catalytic reactions. In our approach, the reactants are introduced into the catalyst bed using a fixed tube at one end of the MAS rotor while a second fixed tube, linked to a vacuum pump, is attached at the other end of the rotor. The pressure difference between both ends of the catalyst bed inside the sample cell space forces the reactants flowing through the catalyst bed, which improves the diffusion of the reactants and products. This design allows the use of a large sample volume for enhanced sensitivity and thus permitting in situ C-13 CF-MAS studies at natural abundance. As an example of application, we show that reactants, products and reaction transition states associated with the 2-butanol dehydration reaction over a mesoporous silicalite supported heteropoly acid catalyst (HPA/meso-silicalite-1) can all be detected in a single C-13 CF-MAS NMR spectrum at natural abundance. Coke products can also be detected at natural C-13 abundance and under the stopped flow condition. Furthermore, H-1 CF-MAS NMR is used to identify the surface functional groups of HPA/meso-silicalite-1 under the condition of in situ drying. We also show that the reaction dynamics of 2-butanol dehydration using HPA/meso-silicalite-1 as a catalyst can be explored using H-1 CF-MAS NMR ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.subject MAS NMR-SPECTROSCOPY ko
dc.subject HETEROGENEOUS CATALYSIS ko
dc.subject GAS-CHROMATOGRAPHY ko
dc.subject SOLID CATALYSTS ko
dc.subject ZEOLITE ko
dc.subject CONVERSION ko
dc.subject H3PW12O40 ko
dc.subject HETEROPOLYACIDS ko
dc.subject OPPORTUNITIES ko
dc.subject PROPAN-2-OL ko
dc.title A large sample volume magic angle spinning nuclear magnetic resonance probe for in situ investigations with constant flow of reactants ko
dc.title.alternative A large sample volume magic angle spinning nuclear magnetic resonance probe for in situ investigations with constant flow of reactants ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84863049967 ko
dc.identifier.wosid 000299505400003 ko
dc.type.rims ART ko
dc.description.wostc 5 *
dc.description.scopustc 5 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1039/c1cp22692d ko
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