Selective conversion of lactic acid into acrylic acid over hydroxyapatite catalysts

Matsuura, Yumiko; Onda, Ayumu; Yanagisawa, Kazumichi

doi:10.1016/j.catcom.2014.01.009

Cited by 52 publications

(87 citation statements)

References 23 publications

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“…These variations in composition have a very strong impact on the acid and basic properties of solids. In the case of HAP‐Ds, calcium deficiency causes a drop in basicity and an increase of acidity . In the case of HAP‐Es, an increase of basicity and a drop in acidity could be generally observed.…”

Section: Gas‐phase Dehydration Of Lactic Acid To Acrylic Acidmentioning

confidence: 97%

“…All these variations mainly concern site density, but a similar variations in site strength to a lesser extent can be also observed. Matsuura et al have studied the impact of the variation of the Ca/P ratio associated with the partial substitution of calcium by sodium , , as well as the effect of the substitution of calcium by Pb or Sr and P by V for HAPs prepared by hydrothermal synthesis. The authors obtains excellent yields (in the order of 70 %) of acrylic acid with the catalyst Ca‐Na‐HAP(1.55) (Ca/P = 1.55; (Ca+Na)/P = 1.65), with a remarkable stability over time (Fig.…”

Section: Gas‐phase Dehydration Of Lactic Acid To Acrylic Acidmentioning

confidence: 99%

“…Stability over time of the catalyst Ca‐Na‐HAP(1.55) during the dehydration of lactic acid to acrylic acid; reprinted with permission from .…”

Section: Gas‐phase Dehydration Of Lactic Acid To Acrylic Acidmentioning

confidence: 99%

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Dehydration of Lactic Acid: The State of The Art

et al. 2017

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The dehydration of lactic acid to produce acrylic acid is a renewable alternative to the mostly used production of acrylic acid from propene. In this review, the recent developments and state of the art for the dehydration of lactic acid to acrylic acid are presented and critically commented. The most recent publications on the topic are discussed inetail with respect to the observed catalysts and process performance data. Among the different catalysts developed, three main groups can be distinguished: zeolites, sulphates, and phosphates. The latter, especially hydroxyapatites, have recently attracted the attention of academics in particular. The three families of catalysts are discussed and the recent developments and technical drawbacks in the gas phase dehydration are reported.

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Section: Gas‐phase Dehydration Of Lactic Acid To Acrylic Acidmentioning

confidence: 97%

Section: Gas‐phase Dehydration Of Lactic Acid To Acrylic Acidmentioning

confidence: 99%

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Dehydration of Lactic Acid: The State of The Art

et al. 2017

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“…Ghantani et al prepared various HAp catalysts by changing Ca/P molar ratio at different pHs and reported a maximum of 60 % selectivity towards AA [17]. Matsura et al recently reported a high AA yield of about 80 % [19]. Peng et al reported approximately 68 % AA selectivity over Na-Y zeolites modified with potassium salts [20].…”

Section: Introductionmentioning

confidence: 99%

“…Several authors reported in the literature recently on the dehydration of LA to AA over hydroxyapatite (HAp) catalysts [16][17][18][19] and Na-Y zeolites [20][21][22][23]. Ghantani et al prepared various HAp catalysts by changing Ca/P molar ratio at different pHs and reported a maximum of 60 % selectivity towards AA [17].…”

Section: Introductionmentioning

confidence: 99%

Vapor-phase catalytic dehydration of lactic acid to acrylic acid over nano-crystalline cerium phosphate catalysts

et al. 2016

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A series of cerium phosphate (CeP) catalysts were synthesized using precipitation method with varying Ce/P mole ratios ranging from 0.5 to 3.0 followed by calcination. The formation of cerium phosphate was confirmed by X-ray diffraction and FT-IR techniques. The catalysts were further characterized to understand the morphology, surface area by using transmission electron microscopy (TEM) and N 2 -sorption measurements. The acidic and basic sites were measured by CO 2 -TPD, NH 3 -TPD and ex situ pyridine FT-IR methods. These calcined CeP catalysts were employed for the dehydration of lactic acid (LA) to acrylic acid (AA) under vapor-phase reaction conditions. Among the catalysts examined, CeP catalyst with Ce/P mole ratio 2.5 (CeP(2.5)) was found to exhibit better catalytic performance with conversion of lactic acid *100 and 64 % selectivity towards acrylic acid at optimized conditions. Time-on-stream experiments suggest that CeP(2.5) catalyst exhibited constant activity until 20 h after which a slight drop of conversion of lactic acid was noticed. The characterization studies of the spent catalysts using thermogravimetric (TG), CHNS analysis and FT-IR reveal the presence of carbonaceous species over the catalyst surface causing deactivation of the catalyst.

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