The effects of thermal treatment of ZnO–ZnCr2O4 catalyst on the particle size and product selectivity in dehydrocyclization of crude glycerol and ethylenediamine

The ZnO–ZnCr 2 O 4 (Zn–Cr–O) sample obtained by decomposition of Zn-Cr hydrotalcite precursor was subjected to the thermal treatment at different temperatures and the physico-chemical properties of the Zn–Cr–O system were compared with its catalytic behavior in dehydrocyclization of crude glycerol a...

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Published inKinetics and catalysis Vol. 57; no. 5; pp. 602 - 609
Main Authors Sarkari, Reema, Krishna, Vankudoth, Sudhakar, Medak, Rao, Tumula Venkateshwar, Padmasri, Aytam Hari, Srinivas, Darbha, Venugopal, Akula
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2016
Springer Nature B.V
Subjects
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Particle size
Physical Chemistry
Selectivity
Zinc oxide
crude glycerol
2-methylpyrazine
Zn-Cr-O
XRD
dehydrocyclization
ESR
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Summary:The ZnO–ZnCr 2 O 4 (Zn–Cr–O) sample obtained by decomposition of Zn-Cr hydrotalcite precursor was subjected to the thermal treatment at different temperatures and the physico-chemical properties of the Zn–Cr–O system were compared with its catalytic behavior in dehydrocyclization of crude glycerol and ethylenediamine (EDA). Upon high temperature treatment of Zn–Cr–O the Cr 6+ ions underwent autoreduction to form stable Cr 3+ species and the particle size of both ZnO and ZnCr 2 O 4 increased dramatically. Thermal effect did not influence the intermolecular cyclisation of EDA to form pyrazine. By contrast, an inversely proportional dependence was found between the rate of formation of 2-methylpyrazine and the particle size of Zn–Cr–O whereas the rate of 2-pyrazinylmethanol was directly proportional to the particle size.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158416050177