University of Oulu

Nekkala, N., Balla, P., Ginjupalli, S.R. et al. Lanthanum phosphate: an efficient catalyst for acrylic acid production through lactic acid dehydration. Biomass Conv. Bioref. (2020).

Lanthanum phosphate : an efficient catalyst for acrylic acid production through lactic acid dehydration

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Author: Nagaraju, Nekkala1; Balla, Putrakumar2; Ginjupalli, Srinivasa Rao3;
Organizations: 1Catalysis Division, Indian Institute of Chemical Technology, Hyderabad, India
2College of Rare Earths (CoRE), Jiangxi University of Science and Technology, Ganzhou, 341000, China
3Basic Science and Humanities Department, Swarnandhra College of Engineering and Technology, Narasapur, 534280, India
4Environmental and Chemical Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 4300, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Springer Nature, 2020
Publish Date: 2022-02-16


In this work, biomass-based platform molecule lactic acid conversion to acrylic acid has been studied. A series of lanthanum phosphate (LaP) catalysts prepared by varying the lanthanum to phosphorus (La/P) mole ratio (i.e., 0.2, 0.35, 0.5, 1.0, and 2.0) and also prepared at different calcination temperatures (i.e., 400, 500, 600, and 800 °C) were investigated. The catalysts were characterized by using different techniques and tested in the dehydration of lactic acid (LA) to acrylic acid (AA) production. All the synthesized catalysts were characterized to analyze the physicochemical properties such as degree of crystallinity, total surface acidity, specific surface area, and morphology. The La/P mole ratio was found to be significant in designing the optimized catalytic system. The NH₃-TPD results imply that all the catalysts exhibited varied amount of total acidity with phosphate loadings, which are mostly weak acid sites. The weak acid sites which are mainly Lewis acidity type played an important role in producing AA selectively and efficiently from the LA conversion. The most optimized reaction conditions were determined to obtain the highest LA conversion, selectivity, and AA yield. The catalyst with an La/P mole ratio of 0.35 and calcined at 500 °C exhibited the best performance with complete LA conversion, AA selectivity of ~ 74%, and a maximum yield of AA of ~ 74%. Furthermore, the LaP(0.35)[500] catalyst was successfully tested at three different time on streams and found to be stable.

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Series: Biomass conversion and biorefinery
ISSN: 2190-6815
ISSN-E: 2190-6823
ISSN-L: 2190-6815
Volume: In press
DOI: 10.1007/s13399-020-01148-4
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
215 Chemical engineering
218 Environmental engineering
Copyright information: © 2020 Springer-Verlag GmbH Germany, part of Springer Nature 2020. This is a post-peer-review, pre-copyedit version of an article published in Biomass Conv. Bioref. The final authenticated version is available online at