Rhodium–Chitosan Composites Supported on Magnesium–HZSM-5 in the Conversion of Dimethyl Ether to Lower Olefins

The catalytic properties of composite catalyst systems based on zeolite HZSM-5 modified with magnesium, rhodium, and chitosan have been studied. The introduction of a rhodium–chitosan composite has a significant effect on the catalytic properties of the zeolite catalyst providing a significant incre...

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Bibliographic Details
Published inPetroleum chemistry Vol. 58; no. 12; pp. 1013 - 1018
Main Authors Kolesnichenko, N. V., Kolesnikova, E. E., Obukhova, T. K., Bondarenko, G. N.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2018
Springer
Springer Nature B.V
Subjects
Alkenes
Catalysts
Catalytic converters
Chemistry
Chemistry and Materials Science
Chitosan
Diffuse reflectance spectroscopy
Dimethyl ether
Fourier transforms
Industrial Chemistry/Chemical Engineering
Infrared spectroscopy
Magnesium
Methyl ether
Olefins
Pretreatment
Rhodium
Stability
Synthesis gas
Zeolites
dimethyl ether
lower olefins
zeolite catalysts
zeolites
composite catalysts
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Summary:The catalytic properties of composite catalyst systems based on zeolite HZSM-5 modified with magnesium, rhodium, and chitosan have been studied. The introduction of a rhodium–chitosan composite has a significant effect on the catalytic properties of the zeolite catalyst providing a significant increase in the activity and stability of the catalyst. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) has revealed that the use of chitosan leads to a decrease in the total acidity of the zeolite catalyst mostly owing to a decrease in the number of strong Brønsted acid sites. It has been shown that the pretreatment of Mg–Rh*chitosan–HZSM-5 with synthesis gas leads to an increase in the time-on-stream stability of the catalyst.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544118120058