.alpha.-Te2MoO7 as an Active Species in the Vapor-Phase Selective Oxidation of Ethyl Lactate to Pyruvate over TeO2-MoO3 Catalysts

1995 ◽  
Vol 34 (1) ◽  
pp. 135-139 ◽  
Author(s):  
Hiromu Hayashi ◽  
Shigeru Sugiyama ◽  
Naoki Masaoka ◽  
Naoya Shigemoto
Keyword(s):  
Selective Oxidation ◽  
Vapor Phase ◽  
Active Species ◽  
Ethyl Lactate ◽  
Moo3 Catalysts

scholarly journals High-Performance Vapor-Phase Selective Oxidation of Ethyl Lactate to Ethyl Pyruvate over SiO2 Supported PMoVNb Oxides

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 197
Author(s):  
Xiaoyu Liu ◽  
Qi Wang ◽  
Chenghao Liu ◽  
Xiaolong Wang ◽  
Cuina Peng ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
High Performance ◽  
High Selectivity ◽  
Mixed Oxides ◽  
Ethyl Pyruvate ◽  
Maximum Yield ◽  
Active Species ◽  
Ethyl Lactate ◽  
Superior Performance ◽  
Decarboxylation Reaction

This paper describes the application of P-Mo-V-Nb/SiO2 catalysts for the selective oxidation of ethyl lactate (EL) to ethyl pyruvate (EP). The P-Mo-V-Nb/SiO2 catalysts exhibit superior performance for EP selectivity than the corresponding samples of binary V-Nb/SiO2 ternary P-Mo-V/SiO2 and P-Mo-Nb/SiO2 catalysts at same temperatures. The origin of high EP selectivity of the P-Mo-V-Nb/SiO2 catalysts is explored and attributed to the synergistic effect of P, Mo, V, and Nb mixed oxides presented on the surface of the catalyst. The highly dispersive sites separated active species under the action of phosphorus, suppressing over oxidation and improving the selectivity. The existence of MoO3 to provide higher oxidation for catalyst. The redox cycle of V and Nb oxides could be completed through electron transfer between lattice oxygen and metal cations. Moreover, the weak acidity of catalyst surface is favorable to avoid the decarboxylation reaction to target a high selectivity of EP. Therefore, the P-Mo-V-Nb/SiO2 catalyst obtained the maximum yield of 91.8% with a selectivity of 93.8% and a conversion of 99.0% simultaneously at 280 °C.

Additive telluromolybdates as catalyst for vapor-phase selective oxidation of ethyl lactate to pyruvate

1997 ◽  
Vol 121-122 ◽  
pp. 378-381 ◽  
Author(s):  
Hiromu Hayashi ◽  
Shigeru Sugiyama ◽  
Nobuhiro Kokawa ◽  
Kichiro Koto
Keyword(s):  
Selective Oxidation ◽  
Vapor Phase ◽  
Ethyl Lactate

X-ray photoelectron spectra for the oxidation state of TeO2-MoO3 catalyst in the vapor-phase selective oxidation of ethyl lactate to pyruvate

1993 ◽  
Vol 19 (2-3) ◽  
pp. 273-277 ◽  
Author(s):  
H. Hayashi ◽  
N. Shigemoto ◽  
S. Sugiyama ◽  
N. Masaoka ◽  
K. Saitoh
Keyword(s):  
Selective Oxidation ◽  
Oxidation State ◽  
Vapor Phase ◽  
Photoelectron Spectra ◽  
Ethyl Lactate ◽  
X Ray

Vapor-phase oxidation of propylene glycol-methanol mixture to methyl lactate on CeO2/Al2O3 catalyst

2021 ◽  
pp. 92-97
Author(s):  
M.E. Sharanda ◽  
◽  
A.M. Mylin ◽  
O.Yu. Zinchenko ◽  
V.V. Brei ◽  
...  
Keyword(s):  
Propylene Glycol ◽  
Vapor Phase ◽  
Flow Reactor ◽  
Aldol Condensation ◽  
Ethyl Lactate ◽  
Molar Ratio ◽  
Methyl Lactate ◽  
Reactor Inlet ◽  
Phase Oxidation ◽  
Al2o3 Catalyst

The vapor-phase oxidation of mixtures of propylene glycol with methanol and ethanol to methyl and ethyl lactate, respectively, on supported CeO2/Al2O3 catalyst with 10 wt.% CeO2 content was studied. The steel flow reactor with a fixed catalyst bed (4 cm3) was used. 20 wt.% solution of propylene glycol in alcohol was fed to the reactor inlet by Waters 950 pump at LHSV= 0.5-0.8 h-1. Reaction temperature and pressure were varied in the interval of 190-250 0C and 1.3-1.8 bars respectively. Compressed air was given to the reactor inlet at the molar ratio of propylene glycol/O2 = 1. The reaction products were analyzed using gas chromatography (Agilent 7820A) and 3C NMR (Bruker Avance 400) methods. Studied oxidation of propylene glycol in the presence of methanol describes by total reaction CH3CHOHCH2OH +O2 + СН3OH = CH3CHOHCOOСН3 +2H2O At first, hydroxyacetone is formed that is further oxidized to pyruvic aldehyde, which attaches alcohol to form hemiacetal. Then, hemiacetal of methyl glyoxal rearranges into methyl lactate by Cannizzaro. At 220 0C and load on a catalyst of < 2 mmol PG/gcat/h, the selectivity towards methyl lactate reaches 70 wt.% at 100 % propylene glycol conversion. The main by-products are formed as the result of acetaldehyde transformation. Acetaldehyde could be formed at hydroxyacetone aldol decondensation. In the presence of ethanol, the formation of a significant amount of acetaldehyde and its aldol condensation products as well as the formation of diethoxyethane are observed. Therefore, ethyl lactate selectivity at 100 % propylene glycol conversion does not exceed 45 %. Supported CeO2/SiO2 contact was tested in this oxidation reaction also. However, CeO2/SiO2 provides the low, up to 25%, selectivity towards methyl lactate at full propylene glycol conversion. It was shown that at the same conditions methyl lactate is formed with higher selectivity then ethyl lactate. The high methyl lactate yield up to 70 wt.% could be obtained via vapor-phase oxidation of 20% mixture of propylene glycol with methanol by air oxygen on supported CeO2/Al2O3 catalyst at 210 - 220°С and at time contact of 3-4 seconds.

scholarly journals Highly Selective Oxidation of Ethyl Lactate to Ethyl Pyruvate Catalyzed by Mesoporous Vanadia–Titania

ACS Catalysis ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 2365-2374 ◽  
Author(s):  
Wei Zhang ◽  
Giada Innocenti ◽  
Paula Oulego ◽  
Vitaly Gitis ◽  
Haihong Wu ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Ethyl Pyruvate ◽  
Ethyl Lactate

Tuning surfactant-templates of nanorod-like cryptomelane synthesis towards vapor-phase selective oxidation of benzyl alcohol

2020 ◽  
Vol 277 ◽  
pp. 128333
Author(s):  
Tuyet-Mai Tran-Thuy ◽  
Linh-Dang Nguyen ◽  
Hoa-Hung Lam ◽  
Dung V. Nguyen ◽  
Trung Dang-Bao
Keyword(s):  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Vapor Phase ◽  
Oxidation Of Benzyl Alcohol ◽  
Surfactant Templates
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