Chemical–physical characterization of Fe-doped, Keggin-type P/Mo polyoxometalates, catalysts for the selective oxidation of isobutane to methacrylic acid

2003 ◽  
Vol 256 (1-2) ◽  
pp. 275-290 ◽  
Author(s):  
E Etienne ◽  
F Cavani ◽  
R Mezzogori ◽  
F Trifirò ◽  
G Calestani ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Methacrylic Acid ◽  
Physical Characterization ◽  
Keggin Type

Main aspects of the selective oxidation of isobutane to methacrylic acid catalyzed by Keggin-type polyoxometalates

2001 ◽  
Vol 71 (1-2) ◽  
pp. 97-110 ◽  
Author(s):  
Fabrizio Cavani ◽  
Roberto Mezzogori ◽  
Anne Pigamo ◽  
Ferruccio Trifirò ◽  
Eric Etienne
Keyword(s):  
Selective Oxidation ◽  
Methacrylic Acid ◽  
Keggin Type ◽  
Acid Catalyzed

Effect of vanadyl species in Keggin-type heteropoly catalysts in selective oxidation of methacrolein to methacrylic acid

2015 ◽  
Vol 329 ◽  
pp. 431-440 ◽  
Author(s):  
Lilong Zhou ◽  
Lei Wang ◽  
Suojiang Zhang ◽  
Ruiyi Yan ◽  
Yanyan Diao
Keyword(s):  
Selective Oxidation ◽  
Methacrylic Acid ◽  
Keggin Type

scholarly journals Elucidating the role of H2O in promoting the formation of methacrylic acid during the oxidation of methacrolein over heteropolyacid compounds

2020 ◽  
Author(s):  
SARAYUTE CHANSAI ◽  
Yuki Kato ◽  
Wataru Ninomiya ◽  
Christopher Hardacre
Keyword(s):  
Selective Oxidation ◽  
Mass Spectrometer ◽  
Methacrylic Acid ◽  
In Situ Drifts ◽  
Keggin Type

The involvement of water in the selective oxidation of MAL to MAA over a pure Keggin-type H3PMoO12O40 catalyst was investigated using an in-situ DRIFTS reactor coupled with a mass spectrometer...

PEG400 Modification of Keggin-Type H4PMo11VO40-Based Catalysts for the Selective Oxidation of Methacrolein to Methacrylic Acid

2012 ◽  
Vol 550-553 ◽  
pp. 252-256 ◽  
Author(s):  
Li Yang ◽  
Heng Zhang ◽  
Rui Yi Yan ◽  
Xiang Ping Zhang ◽  
Guang Jin Zhang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Methacrylic Acid ◽  
Phosphomolybdic Acid ◽  
Catalytic Performance ◽  
Optimum Conditions ◽  
Heteropoly Anion ◽  
Keggin Type ◽  
Surface Areas ◽  
Ft Ir ◽  
Specific Surface Areas

Keggin-type 12-phosphomolybdic acid with molybdenum partially substituted by vanadium and protons partially substituted by alkali and transition metals was synthesized for the selective oxidation of methacrolein to methacrylic acid. The structures of the catalysts were studied by FT-IR, XRD, TG-DTA and BET. The effects of the additive amount of PEG400, calcination temperature and the content of Cs on the catalytic performance were investigated. Results show that specific surface areas of the catalysts increase with the increase of PEG400 amount; PEG400 is removed at 250 °C and the primary structure of the catalysts is not changed with the addition of PEG400. The conversion and selectivity increase with the Cs content, and then decrease. The catalyst with the ratio of Cs+: heteropoly anion=1:1 exhibits good catalytic performance for the selective oxidation of MAL. Under the optimum conditions, the conversion of MAL and selectivity of MAA are 76.4% and 83.6% respectively.

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