scholarly journals Kinetics of aldol condensation of acetic acid with formaldehyde on B–P–V–W–OX/SiO2 catalyst

2020 ◽  
Vol 3 (2) ◽  
pp. 39-45
Author(s):  
N. S. Pavliuk ◽  
◽  
V. V. Ivasiv ◽  
O. M. Orobchuk ◽  
D. S. Shevchenko ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Chemical Composition ◽  
Acrylic Acid ◽  
Gas Phase ◽  
Silicon Oxide ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Kinetic Equations ◽  
Stable Chemical ◽  
Kinetics Of

New catalysts B–P–V–W–Ox/SiO2 of gas-phase condensation of acetic acid from formaldehyde to acrylic acid on an industrial carrier of stable chemical composition (colloidal silicon oxide, Aerosil A-200) were synthesized. It is shown that the hydrothermal treatment of the carrier allows to increase the activity and selectivity of the catalyst in the reactions of aldol condensation of acetic acid with formaldehyde. It was found that the developed catalyst is effective in the condensation reaction of acetic acid with formaldehyde, which allows to obtain acrylic acid with a yield of 68.7% and a selectivity of 94.1%. The kinetic regularities of the reaction on this catalyst are established. According to the proposed kinetic equations, kinetic parameters are calculated that describe the condensation reaction of acetic acid with formaldehyde.

scholarly journals The Kinetics of the Gas Phase Aldol Condensation Reaction of Propionic Acid with Formaldehyde on B2O3-P2O5-WO3/SiO2 Catalyst

2014 ◽  
Vol 8 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Roman Nebesnyi ◽  
◽  
Volodymyr Ivasiv ◽  
Zorian Pikh ◽  
Viacheslav Zhyznevskyi ◽  
...  
Keyword(s):  
Gas Phase ◽  
Propionic Acid ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Kinetics Of

Liquid-phase aldol condensation of cyclohexanone on aluminium and iron oxides

1982 ◽  
Vol 47 (8) ◽  
pp. 2235-2245 ◽  
Author(s):  
Zdeněk Vít ◽  
Lubomír Nondek ◽  
Jaroslav Málek
Keyword(s):  
Iron Oxides ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Complex Function ◽  
Acid Sites ◽  
Basic Site ◽  
Catalyst Poisoning ◽  
Iron Hydroxides ◽  
Transient Complex ◽  
Kinetics Of

The kinetics of the aldol condensation of cyclohexanone in decalin were investigated at 210 °C on catalysts prepared by drying and calcining the aluminium and iron hydroxides at 110-850 °C. The effect of catalyst poisoning by benzoic acid and pyridine on the course of the condensation reaction and aldol retroaldolisation was also examined. The kinetics of the cyclohexanone condensation can be described by means of Langmuir-Hinshelwood equations which are in agreement with a mechanism involving adsorption of cyclohexanone on a basic site to form a transient complex, reaction of this complex with a cyclohexanone molecule affording the aldol, the rate determining interaction of the aldol with free basic and acid sites yielding 2-(1-cyclohexen-1-yl)cyclohexanone and water and desorption of these products from the catalyst surface. The proposed kinetic model is supported by the results of catalyst poisoning. The activity of aluminium and iron oxides in the condensation of cyclohexanone is a complex function of their basicity and acidity depending strongly on the calcination temperature.

scholarly journals Acrylic acid synthesis by aldol condensation of acetic acid and formaldehyde on V-Ti-PO4 catalysts

2017 ◽  
Vol 0 (32(1254)) ◽  
pp. 117-122
Author(s):  
Iryna Shpyrka ◽  
Roman Nebesnyi ◽  
Zorian Pikh ◽  
Volodymyr Sydorchuk ◽  
Volodymyr Ivasiv ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation ◽  
Acid Synthesis

scholarly journals Aldol condensation of acetic acid with formaldehyde to acrylic acid over Cs(Ce, Nd) VPO/SiO2 catalyst

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48475-48485 ◽  
Author(s):  
Aili Wang ◽  
Jing Hu ◽  
Hengbo Yin ◽  
Zhipeng Lu ◽  
Wuping Xue ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation

The Cs-, Ce-, and Nd-modified VPO/SiO2 exhibited higher activity for aldol condensation of acetic acid with formaldehyde to acrylic acid.

Aldol condensation of acetic acid and formaldehyde to acrylic acid over a hydrothermally treated silica gel-supported B-P-V-W oxide

2020 ◽  
Vol 594 ◽  
pp. 117472 ◽  
Author(s):  
R. Nebesnyi ◽  
Z. Pikh ◽  
V. Sydorchuk ◽  
S. Khalameida ◽  
I. Kubitska ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Silica Gel ◽  
Aldol Condensation

Aldol condensation of acetic acid with formaldehyde to acrylic acid over SiO2-, SBA-15-, and HZSM-5-supported V-P-O catalysts

2016 ◽  
Vol 40 ◽  
pp. 145-151 ◽  
Author(s):  
Jing Hu ◽  
Zhipeng Lu ◽  
Hengbo Yin ◽  
Wuping Xue ◽  
Aili Wang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation

scholarly journals Effect of Support Nature on the Efficiency of B–P–V–W–Ox Catalysts of Acrylic Acid Synthesis with Aldol Condensation of Acetic Acid with Formaldehyde

2019 ◽  
Author(s):  
Roman Nebesnyi ◽  
Iryna Kubitska ◽  
Oksana Orobchuk ◽  
Volodymyr Ivasiv ◽  
Volodymyr Sydorchuk ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation ◽  
Acid Synthesis ◽  
Effect Of Support

scholarly journals Effect of metal-doped VPO catalysts for the aldol condensation of acetic acid and formaldehyde to acrylic acid

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 5958-5966 ◽  
Author(s):  
Yumeng Wang ◽  
Yuelin Hou ◽  
Xue Hao ◽  
Zhenlu Wang ◽  
Wanchun Zhu
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Active Site ◽  
Aldol Condensation ◽  
Catalytic Performance ◽  
Moderate Amount ◽  
Vpo Catalysts ◽  
Metal Doped

The acidity of the catalyst is a major factor affecting the catalytic performance of the catalyst. It is presumed that B acid is the main active site of this reaction, and a moderate amount of acid is favorable to facilitate the reaction.

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