Lactic Acid Conversion to Acrylic Acid Over Fluoride-Substituted Hydroxyapatites.

ABSTRACT: One of the most interesting intermediates for the chemical industry is acrylic acid, which can be derived from lactic acid by catalytic dehydration in the gas phase. The realization of this reaction is complex due to a strong thermal activation leading to the formation of undesired by-products (acetaldehyde, propanoic acid…) as well as polymerization. We studied this reaction over hydroxyapatites modified by substitution of the hydroxyl groups by fluoride. This notably enabled increasing the selectivity to acrylic acid while reducing the formation of the undesired acetaldehyde. Introduction of fluoride induced a modification of the phosphate ( PO43- ) groups. In the presence of water, fluoride prevented the formation of hydrogenophosphate species ( HPO42- ), which are well-known acid sites

SUBMITTER: Wojcieszak R 

PROVIDER: S-EPMC7237761 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature