Screening of catalysts for the oxidative dehydrogenation of ethyl lactate to ethyl pyruvate, and optimization of the best catalysts

Huchede, M.; Morvan, Didier Le; Bellière-Baca, V.; Millet, J.M.M.

doi:10.1016/j.apcata.2020.117619

Cited by 10 publications

(18 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of this study are in line with many previous experimental observations, and in agreement with most of the models proposed for the active phase of vanadium antimonate in other oxidation reactions [19]. When compared to other catalysts, mixed iron and vanadium antimonates are very active and selective for the oxidative dehydrogenation of ethyl lactate into ethyl pyruvate [3][4][5][6][7][8].…”

Section: Discussionsupporting

confidence: 89%

“…Finally, in addition to their proven effectiveness in the oxidative dehydrogenation of ethyl lactate, these catalysts are considerably more stable than the best catalysts known hitherto, which are polyoxometallates [8]. When prepared at 900°C, these new catalysts are more thermally stable and their catalytic properties do not vary when they are maintained under catalytic conditions for long periods of time.…”

Section: Discussionmentioning

confidence: 99%

“…The catalytic properties of the synthesized compounds were evaluated using the same setup as that described in previous studies [8]. Reactions were carried out at temperatures ranging between 250 and 400°C, with a gas mixture composition corresponding to EtLA/O 2 /inert = 12.3/ 18.4/ 69.3, with m cat = 250 mg -1 , PPH = 0.1 h and V total = 65 mL.min -1 .…”

Section: Catalysts Testingmentioning

confidence: 99%

“…For all catalysts, the selectivity to ethyl pyruvate remains constant when the temperature is increased to 275°C. However, the selectivity decreases at higher temperatures to the advantage of all of the other by-products, which are formed by the decomposition of both ethyl lactate and ethyl pyruvate [8].…”

Section: Test Of Catalyst In Ethyl Lactate Oxidative Dehydrogentionmentioning

confidence: 99%

“…The present authors recently published a study describing the screening of approximately twenty oxide catalysts, which were used to promote various oxidative dehydrogenation reactions reported in the literature. This study revealed that the most suitable catalyst was phosphomolybdic polyoxometalate, with iron counter-cations [8]. These catalysts allow ethyl lactate to be produced at 77% conversion, with a 79% selectivity to ethyl pyruvate at 275 °C, under reaction conditions compatible with an industrial process.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Oxidative dehydrogenation of ethyl lactate to ethyl pyruvate over vanadium and iron antimonates catalysts

Huchede

Morvan

Vera

et al. 2021

Applied Catalysis A: General

Self Cite

View full text Add to dashboard Cite

The oxidative dehydrogenation of ethyl lactate to ethyl pyruvate, corresponding to the first step of a new process in the industrial production of methionine, has been investigated. Iron and vanadium antimonates were developed as catalysts, and were optimized to reach 87% conversion of ethyl lactate, with 88% selectivity to ethyl pyruvate, at only 275 °C. The catalysts were characterized before and after catalytic testing, and in situ using various techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and XANES spectroscopy. The results show that neither the Sb 3+ /Sb 5+ nor the Fe 2+ /Fe 3+ redox couple were involved in the dehydrogenation of ethyl lactate, or in the catalysts re-oxidation. The active and selective catalytic sites correspond to surface V 5+ species. These species should not be considered as part of the bulk oxide, but as supra-surface species whose surface content is monitored with the bulk composition.

show abstract