%0 Journal Article %1 hunger1999technique %A Hunger, Michael %A Seiler, Michael %A Horvath, Thomas %D 1999 %J Catalysis letters %K unibibliografie from:jmueller liste ubs_30038 %N 4 %P 199-204 %R 10.1023/A:1019064003201 %T A technique for simultaneous in situ MAS NMR and on-line gas chromatographic studies of hydrocarbon conversions on solid catalysts under flow conditions %V 57 %X A new technique is introduced allowing simultaneous in situ MAS NMR investigations of hydrocarbon conversions on solids under flow conditions and on-line gas chromatography. For adsorption of methanol on zeolite HBeta, equal amounts of adsorbed molecules were determined by both analytical methods. Studying the synthesis of methyl tertiary-butyl ether (MTBE) on zeolite HBeta using an MAS NMR rotor reactor, a constant yield of MTBE of Ymtbe= 27\% was obtained up to a weight hourly space velocity of 1.4 h-1. The variation of the reaction temperature led to a simultaneous change of the 13C MAS NMR signals of isobutoxy species and of the yield of MTBE determined by on-line gas chromatography which indicates that isobutoxy species act as chemically active compounds. In this first application, the new in situ technique has demonstrated its advantage for a simultaneous investigation of compounds with a long residence time on the catalyst surface and of compounds rapidly leaving the catalyst surface.

@article{hunger1999technique, abstract = {A new technique is introduced allowing simultaneous in situ MAS NMR investigations of hydrocarbon conversions on solids under flow conditions and on-line gas chromatography. For adsorption of methanol on zeolite HBeta, equal amounts of adsorbed molecules were determined by both analytical methods. Studying the synthesis of methyl tertiary-butyl ether (MTBE) on zeolite HBeta using an MAS NMR rotor reactor, a constant yield of MTBE of Ymtbe= 27{\%} was obtained up to a weight hourly space velocity of 1.4 h-1. The variation of the reaction temperature led to a simultaneous change of the 13C MAS NMR signals of isobutoxy species and of the yield of MTBE determined by on-line gas chromatography which indicates that isobutoxy species act as chemically active compounds. In this first application, the new in situ technique has demonstrated its advantage for a simultaneous investigation of compounds with a long residence time on the catalyst surface and of compounds rapidly leaving the catalyst surface.}, added-at = {2019-07-17T14:26:14.000+0200}, author = {Hunger, Michael and Seiler, Michael and Horvath, Thomas}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/21fd9255bdd63966852da4709c7b32701/iftc}, day = 01, doi = {10.1023/A:1019064003201}, interhash = {dde389c5ec62d88dac0550e6801b8434}, intrahash = {1fd9255bdd63966852da4709c7b32701}, issn = {{1572-879X} and {1011-372X}}, journal = {Catalysis letters}, keywords = {unibibliografie from:jmueller liste ubs_30038}, language = {eng}, month = mar, number = 4, pages = {199-204}, timestamp = {2019-07-17T12:26:14.000+0200}, title = {A technique for simultaneous in situ MAS NMR and on-line gas chromatographic studies of hydrocarbon conversions on solid catalysts under flow conditions}, volume = 57, year = 1999 }