Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F04%3A00000309" target="_blank" >RIV/61388955:_____/04:00000309 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study

Original language description

The effect of the structure of large pore zeolites of Mordenite, beta, L and Y types on the activity, selectivity to xylenes and time-on-stream stability was investigated in trimethyl benzene disproportionation. Significant differences in conversion andtime-on-stream stability were observed among individual zeolites. Zeolite beta and zeolite Y were found to exhibit the highest stability in conversion of trimethyl benzenes, while zeolite L and Mordenite were deactivated much faster. The optimum reactionconditions to achieve a high and stable conversion with sufficient selectivity to xylenes were at the reaction temperature of 400 degreesC with WHSV = 5-20 h(-1). Diffusion coefficients of trimethyl and tetramethyl benzenes over zeolites Y, beta and Mordenite at 25 degreesC were determined. Due to the significant differences in diffusion of individual trimethyl and tetramethyl benzenes, it is expected that diffusion of these molecules substantially influence the rate of this reaction.

Czech name

Disproporcionace trimethyl benzenů na širokoporézníích zeolitech: katalytická a adsorpční studie

Czech description

Byl studován vliv struktury širokoporézních zeolitů Y, Beta, L and mordenitu na aktivitu, selektivitu na xyleny a časovou stabilitu při disproporcionaci trimethylbenzenů. Mezi jednotlivými zeolity byly shledány zásadní rozdíly. Nejvyšší aktivitu a časovou stálost vykazovaly zeolity Y a Beta zatímco mordenit a zeolit L se velmi snadno deaktivovaly. Nejvyšší stabilita konverze při rozumné selektivitě na xyleny byla dosažena při 400 oC a WHSV = 5-20 h-1. Na studovaných zeolitech byly změřeny též difuzní koeficienty trimethylbenzenů a tetramethylbenzenů, které potvrdily rozdílnou rychlost transportu reaktantů a produktů. Navíc tyto experimenty prokázaly rozdílnou dostupnost katalyticky aktivních center v kanálech jednotlivých zeolitů

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2004

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Catalysis

ISSN

0926-860X

e-ISSN

—

Volume of the periodical

277

Issue of the periodical within the volume

1/2

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

191-199

UT code for WoS article

—

EID of the result in the Scopus database

—