Oxidation of isobutane on a heteropolycompound hydrogen reservoir

Jalowiecki‐Duhamel, Louise; Monnier, A.; Barbaux, Y.; Hecquet, G.

doi:10.1016/s0920-5861(96)00180-0

Cited by 49 publications

(12 citation statements)

References 13 publications

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“…To our understanding, 2-methyl propanol and tertbutanol have not been reported as reaction intermediates in the literature, whereas iso-butene was suggested to be a reaction intermediate in iso-butane oxidation [30,31]. Although we did not detect iso-butene, 2-methyl propanol, tert-butanol, and 2-methyl acrylic acid as products in iso-butane oxidation, they could be transient intermediates undetected in the experiments.…”

Section: Search For Iso-butane Oxidation Intermediatescontrasting

confidence: 77%

The partial oxidation of C4–C6 alkanes to maleic anhydride, 2-methyl maleic anhydride, and acetic acid over MoVO catalysts

Chen

Tang

et al. 2006

Catal Lett

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Alkanes such as iso-butane, n-pentane, and cyclohexane have been converted effectively to maleic anhydride, 2-methyl maleic anhydride, and acetic acid over MoVO catalysts below 330°C. In order to explore the possible reaction pathways, the oxidation of iso-butene, cyclohexene, 2-methyl-1-propanol, tert-butanol, and 2-methylacrylic acid were examined over the catalysts. In isobutene oxidation, acetic acid and 2-methyl maleic anhydride were detected but not maleic anhydride. In cyclohexene oxidation, benzene and phenol were detected as major products but it was not the case in cyclohexane oxidation. The results of our investigation indicate that the oxidation pathway of iso-butane is different from that of iso-butene, 2-methyl-1-propanol, tertbutanol, and 2-methylacrylic acid, whereas the oxidation pathway of cyclohexane is different from that of cyclohexene.

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Section: Search For Iso-butane Oxidation Intermediatescontrasting

confidence: 77%

The partial oxidation of C4–C6 alkanes to maleic anhydride, 2-methyl maleic anhydride, and acetic acid over MoVO catalysts

Chen

Tang

et al. 2006

Catal Lett

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“…Various catalyst systems, including heteropoly compounds [1][2][3][4][5], mixed oxide catalysts (such as Mo-V-Sb, Pt/SbO x , etc) [6][7][8][9][10] and mesoporous materials [11,12], have been studied for the selective oxidation of isobutane to isobutylene, methacrolein and methacrylic acid. Among them, heteropolyacid (HPA) catalysts have been the most extensively studied system.…”

Section: Introductionmentioning

confidence: 99%

Selective Oxidation of Isobutane to Methacrolein over Mo–V–Te–Sb Mixed Oxide Catalysts with Different Antimony Contents

et al. 2006

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“…Methacrylic acid has been shown to form from the oxidation of isobutane over heteropoly compounds such as phosphomolybdates [7,[44][45][46][47][48][49][50]. Typically, methacrylic acid is not formed for isobutane selective oxidation with the low-pressure TPRS system employed in this study [22][23][24].…”

Section: Detection Of Methacrylic Acidmentioning

confidence: 99%

Comprehensive Study of Isobutane Selective Oxidation Over Group I and II Phosphomolybdates: Structural and Kinetic Factors

Kendel

Brown

2011

Catal Lett

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Various phosphomolybdates were synthesized using cations from Groups 1 and 2 of the periodic table. These compounds were of the form M x H 3-xn [PMo 12 O 40 ], with n being the cationic charge (?1 or ?2). XRD analysis shows pure phosphomolybdic acid has a triclinic structure. A body centered cubic (BCC) structure gradually develops with addition of Group 1 cations, and the triclinic phase is completely replaced by the BCC phase once metal cations occupy a volume greater than 9-11 Å 3 per phosphomolybdate anion. The Group 2 compounds do not form a cubic phase, however the triclinic phase distorts once cationic volume is greater about 5 or 6 Å 3 and appears to become somewhat amorphous. Isobutane selective oxidation over the compounds yielded methacrolein (primary product), 3-methyl-2-oxetanone (lactone), acetic acid, propene, methacrylic acid, carbon dioxide and water as products. Propene was formed over the Group 1 compounds exclusively and methacrylic acid formation was observed with BaH[PMo 12 O 40 ] only. Products form via two distinct processes: Category 1 product has an exponential profile and coverage is consistent with a Langmuir model, Category 2 formations are consistent with desorptions from within the bulk of the substrates. Methacrolein forms via both Category 1 and 2 processes, whilst all other products are formed by Category 2 exclusively. A rigorous kinetic analysis yielded accurate activation parameters. Category 1 methacrolein formation apparent activation energies ranged from 34.7 ± 1.3 to 119 ± 4 kJ mol -1 . Category 2 formations ranged from 34.3 ± 0.4 to 726 ± 172 kJ mol -1 . No relationship between activity and composition or structure could be ascertained, despite investigation into correlations using several different models.

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Oxidation of isobutane on a heteropolycompound hydrogen reservoir

Cited by 49 publications

References 13 publications

The partial oxidation of C4–C6 alkanes to maleic anhydride, 2-methyl maleic anhydride, and acetic acid over MoVO catalysts

The partial oxidation of C4–C6 alkanes to maleic anhydride, 2-methyl maleic anhydride, and acetic acid over MoVO catalysts

Selective Oxidation of Isobutane to Methacrolein over Mo–V–Te–Sb Mixed Oxide Catalysts with Different Antimony Contents

Comprehensive Study of Isobutane Selective Oxidation Over Group I and II Phosphomolybdates: Structural and Kinetic Factors

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