Häussermann, DorotheaSchömig, RichardGehring, BarbaraTraa, Yvonne2024-02-232024-02-2320232073-43441882118715http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-139613http://elib.uni-stuttgart.de/handle/11682/13961http://dx.doi.org/10.18419/opus-13942Acrylic 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.eninfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/4.0/660article2023-11-13