Hydroxyapatite-based materials as catalysts: A review

• Published in: Particuology 2025-01, Vol.96, p.203-217
• Main Authors: Kharissova, Oxana V., Méndez, Yolanda Peña, Kharisov, Boris I., González, Lucy T., Dorozhkin, Sergei V.
• Format: Article
• Language: English
• Subjects: Alcohol oxidation; Biofuel production; Catalysis; Environmental remediation; Hydroxyapatite
• ISSN: 1674-2001
• DOI: 10.1016/j.partic.2024.11.007

Hydroxyapatite, a bioceramic material, possesses sufficient stability in aqueous and organic medium and it is mainly known for its role in tooth and bone structure. However, it is less-known that, in certain conditions, the HA can be used as a catalyst in its free, metal-doped and composite forms. HA as a catalyst is generally prepared by i mpregnation or co-precipitation methods, sometimes from natural P-containing wastes. HA can be doped with mono- or polymetallic ions or nanoparticles and can contain other admixtures or supports (i.e., carbon). Different Ca/P ratios (ideal 1.67; the ranges are 1.5–1.7 in synthetic and 1.5–1.8 in biologic forms) can be revealed for the HA. Nanosized HA forms are frequent in several applications. A variety of distinct processes can be HA-catalyzed, such as oxidation of alcohols, dehydrogenation, hydrogenation and hydrogenolysis, C-C bond formation, among other important existing low- and large-scale organic processes. The HA can be also used for catalytic environmental remediation, CO2 fixation, and N2O decomposition. In this review, we emphasize most recent advances (mainly last decade) on the catalytic HA applications, except for biomedical ones. [Display omitted] •Hydroxyapatite both in free and doped forms can be used as a catalyst.•Hydroxyapatite catalysts are prepared by impregnation or co-precipitation.•Oxidation of alcohols and C-C bond formation are main HA catalytic uses.•Low- and large-scale organic processes can be HA-catalyzed.•CO2 fixation and N2O decomposition are frequently HA-catalyzed.