Isomerization of n-butenes on a-type zeolites studied by infrared spectroscopy. Part 3.—Adsorption and isomerization of n-butenes on zeolites containing transition metal ions

Förster, H.; Seelemann, R.

doi:10.1039/f19817701359

J. Chem. Soc., Faraday Trans. 1

1981

DOI: 10.1039/f19817701359

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Isomerization of n-butenes on a-type zeolites studied by infrared spectroscopy. Part 3.—Adsorption and isomerization of n-butenes on zeolites containing transition metal ions

H. Förster¹,

R. Seelemann²

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“…Fig.2. Spectra of (VO),P,O, after (a) evacuation (17 h, 673 K),(6) contact with buta-1,3-diene (0.93 kN m-2) at ca. 300 K, (c)-(g) subsequent evacuation at (c) ca.…”

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confidence: 99%

Infrared study of the adsorption of but-1-ene, buta-1,3-diene, furan and maleic anhydride on the surface of anhydrous vanadyl pyrophosphate

Puttock¹,

Rochester²

1986

J. Chem. Soc., Faraday Trans. 1

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Brrnsted-acidic hydroxy groups on the surface of vanadyl pyrophosphate act as catalytically active sites for the isomerisation of but-l-ene to but-2-enes. Progressive poisoning of the reaction is attributed to the formation of alkyl species, possibly alkoxy groups, on the (VO),P,O, surface. Adsorbed alkyl groups also result from buta-1,3-diene adsorption. Furan adsorbs on (VO),P,O, through coordinative interactions with Lewis-acidic surface sites. The presence of oxygen promotes the oxidation of furan to maleic anhydride.The importance has been established of vanadyl pyrophosphate as a component of vanadium-phosphorus mixed-oxide catalysts for the oxidation of butane or but-1 -ene to maleic anh~dride.l-~ The surface character of (VO),P207 has been partly established by infrared studies of the adsorption of water, pyridine, CO, CO,, acetic acid and acetic a n h ~d r i d e . ~? ~The present paper reports an infrared study of the adsorption on (VO),P207 of the species (butane, but-1 -ene, buta-1,3-diene, furan and maleic anhydride) involved as reactants, intermediates or product in the oxidation reactions. ExperimentalVanadyl pyrophosphate (surface area 11 m2 g-l) was prepared by reacting orthophosphoric acid and vanadium pentoxide in strongly acidic solution and decomposing the reaction product by thermal activation in vacuum. The purity of the final product was confirmed by infrared spectroscopy and X-ray powder diffracti0n.l Compressed (3.3 ton) self-supporting discs (25 mm diameter) of (VO),P207 (ca. 55 mg) were mounted in an evacuable infrared cell with fluorite windows and an external furnace and were heated at 673 K (17 h) in vacuum before the admission of adsorbate gases. Spectra of discs at ca. 300 K were recorded using a Perkin-Elmer 580A spectrophotometer. High-purity commercial samples of butane, but-1 -ene, buta-1,3-diene and furan were freed from permanent gases by a series of freeze-thaw cycles. Maleic anhydride was purified by sublimation under reduced pressure to remove maleic acid. ResultsContact between butane vapour (1.3 kN m-2) and (VO),P,O, at temperatures in the range 293-723 K gave no detectable change in the infrared spectrum of the gas phase and no infrared bands due to adsorbed species. However, at elevated temperatures the disc turned black, implying that carbon deposition had occurred.Exposure of (VO),P,O, at the ambient temperature in the sample beam of the spectrophotometer (ca. 300 K) to but-1-ene (2.5 kN m-,) gave spectra [fig. 1 (b)] in which the observed bands could primarily be attributed to but-1-ene in the gas phase. The spectra did not vary with time but removal of the gas phase by evacuation left residual 100 3033 FAR 1

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“…Fig.2. Spectra of (VO),P,O, after (a) evacuation (17 h, 673 K),(6) contact with buta-1,3-diene (0.93 kN m-2) at ca. 300 K, (c)-(g) subsequent evacuation at (c) ca.…”

mentioning

confidence: 99%

Infrared study of the adsorption of but-1-ene, buta-1,3-diene, furan and maleic anhydride on the surface of anhydrous vanadyl pyrophosphate

Puttock¹,

Rochester²

1986

J. Chem. Soc., Faraday Trans. 1

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Sorption and isomerization of cyclopropane in A-type zeolites studied by infrared spectroscopy

Förster¹,

Seebode²

1983

Zeolites

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Effects of the acidity and shape selectivity of dealuminated zeolite beta on butene transformations

Chen

Huang³

et al. 2021

Fuel

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Isomerization of n-butenes on a-type zeolites studied by infrared spectroscopy. Part 3.—Adsorption and isomerization of n-butenes on zeolites containing transition metal ions

Cited by 6 publications

References 0 publications

Infrared study of the adsorption of but-1-ene, buta-1,3-diene, furan and maleic anhydride on the surface of anhydrous vanadyl pyrophosphate

Infrared study of the adsorption of but-1-ene, buta-1,3-diene, furan and maleic anhydride on the surface of anhydrous vanadyl pyrophosphate

Sorption and isomerization of cyclopropane in A-type zeolites studied by infrared spectroscopy

Effects of the acidity and shape selectivity of dealuminated zeolite beta on butene transformations

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