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Influence of the synthesis protocol on the catalytic performance of PHI-type zeolites for the dehydration of lactic acid
Publikationstyp
Journal Article
Date Issued
2023-01-24
Sprache
English
Author(s)
Journal
Volume
13
Issue
2
Article Number
261
Citation
Catalysts 13 (2): 261 (2023)
Publisher DOI
Scopus ID
Publisher
MDPI
Acrylic acid is an important basic chemical and a key starting compound for a variety of consumer products. Today, acrylic acid is still produced from fossil-based propene. If acrylic acid were produced from bio-based lactic acid, this would be an important step towards sustainability. The gas-phase dehydration reaction of lactic acid to acrylic acid was performed over eight-membered ring PHI-type zeolites in the Na+ and K+-form. A few variations in the synthesis procedure of PHI-type zeolite made a big difference in the performance during the catalytic reaction due to differences in the physical and chemical properties, especially the accessibility of the pores. The catalysts were characterized with ICP-OES, XRD, CO2 physisorption, SEM and 27Al MAS NMR. The calcination resulted in a partial collapse of the PHI structure. In the case of Na,K-PHI with a low surface area, the catalysis tends to take place on the outer surface, while in the case of Na,K-PHI with a high surface area the catalysis can also take place within the pore system. This has a considerable influence on the selectivity of the catalysts.
Subjects
acrylic acid | dehydration | finned zeolites | lactic acid | phillipsite | X-ray amorphous zeolites | zeolite synthesis
DDC Class
600: Technology