Phthalic Anhydride from<i>o</i>-Xylene Catalysis: Science and Engineering

Nikolov, V.; Klissurski, D.; Anastasov, A. I.

doi:10.1080/01614949108020303

Cited by 154 publications

(76 citation statements)

References 88 publications

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“…Then, 600 mL of a 0.25 M NaOH solution (Janssen Chimica) was added at a rate of 4 mL/min while stirring at 300 rpm. After cooling this solution, 625 mL of 0.1 M Na 2 between each ion-exchange step.…”

Section: Sample Preparation and Characteristicsmentioning

confidence: 99%

“…17 X-ray powder diffractograms were obtained using a Siemens D5000 X-ray diffractometer (XRD) with Cu KR radiation. Liquid 27 Al nuclear magnetic resonance (NMR) measurements were performed with a Bruker AMX 300 spectrometer at 78.208 MHz, with a pulse length of 6 µs and a pulse delay of 5 s. Al(OH) 4 -in D 2 O was used as a reference with a single resonance at 80 ppm. 27 Al magic angle spinning (MAS) NMR of the solid samples was measured on a Bruker MSL 400 spectrometer at 104.2 MHz with a pulse length of 0.61 µs and pulse delay of 0.1 s. Na and Al analyses were done with a Varian Spectra AA-20 Plus spectrometer, whereas electron microprobe surface analysis was performed on a JEOL Superprobe 733 microscope.…”

Section: Pretreatment and Experimental Techniquesmentioning

confidence: 99%

“…[1][2][3][4][5] Furthermore, supported vanadium oxide catalysts are active in the oxidative dehydrogenation of alkanes to olefins, oxidation of butane to maleic anhydride, and the selective oxidation of methanol to formaldehyde or methyl formate. 6,7 In addition, vanadium oxides are generally known as a poison for fluid catalytic cracking (FCC) catalysts by destroying the Brönsted acid sites and the structure of the ultrastable zeolite Y (USY).…”

Section: Introductionmentioning

confidence: 99%

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Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y

et al. 1998

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A series of supported vanadium oxide catalysts were prepared by the incipient wetness method as a function of the support composition (Al 2 O 3 , SiO 2 , and USY), the metal oxide loading (0-1 wt %), and the impregnation salt (vanadyl sulfate and ammonium vanadate). These catalysts have been studied by combined DRS-ESR spectroscopies in order to quantify the amount of V 4+ and V 5+ and to unravel their coordination geometries. These spectroscopic fingerprints have been used to study the preferential adsorption of V 4+/5+ ions on SiO 2 , Al 2 O 3 , and USY. Both V 4+ and V 5+ were preferentially adsorbed on Al 2 O 3 and showed a much smaller preference for USY and SiO 2 . The observed preference orders are discussed in relation with the properties of the support. In addition, a novel method is proposed to coat the external surface of USY with a thin film of Al 2 O 3 . The method is based on the deposition of USY with the so-called Keggin ion, [Al 13 O 4

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Section: Sample Preparation and Characteristicsmentioning

confidence: 99%

Section: Pretreatment and Experimental Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y

et al. 1998

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“…В настоящее время во многих странах производство фталевого ангидрида переведено с нафталина на нефтехимический о-ксилол [3,4]. Это объясняется, во-первых, недостаточными ресурсами нафталина по сравнению с о-ксилолом; во-вторых, при окислении о-ксилола расход сырья и воздуха меньше, и ниже теплота реакции.…”

Section: Introductionunclassified

Low temperature oxidation of o-xylene with hydrogen peroxide in the presence of vanadium xerogels

Yesmurzaeva¹,

Tursunova²,

Selenova³

et al. 2017

KazNU Chem Bull

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The present work is dedicated to investigation of vanadium xerogels deposited on titanium oxide for the oxidation process of o-xylene by hydrogen peroxide under the mild conditions. The structure of deposited vanadium catalyst and sizes of vanadium xerogels nanoparticles were investigated by physicochemical methods. The nano-sized particles (5-8 nm) of xerogel vanadium deposited on titanium oxide exhibit high catalytic activity in the decomposition of hydrogen peroxide and in the oxidation of o-xylene by hydrogen peroxide under mild conditions.

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“…It is determined as the arithmetic means of the readings of all thermocouples, with an accuracy of 1.5 o C. The temperature profiles in the different tubes are reported continuously. The reactor scheme has been presented in our paper Nikolov et al (1991).…”

Section: The Industrial Reactormentioning

confidence: 99%

Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride

Georgieva

Anastasov

Nikolov

2008

Braz. J. Chem. Eng.

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-The behavior of a high-productive V 2 O 5 -TiO 2 (anatase) supported O 4-28 catalyst for oxidation of o-xylene to phthalic anhydride was investigated in the first three years of its exploitation in industry. By using a suitable mathematical model, an identification problem was solved and activation profiles of the catalyst along a fixed bed located in the tubes of an industrial reactor were determined. Experimental temperature regimes and yields of the main and side products for different periods of the catalyst life were used. The proper technological regimes providing for a maximum yield according to the requirements of the catalyst producer company were defined.

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Phthalic Anhydride fromo-Xylene Catalysis: Science and Engineering

Cited by 154 publications

References 88 publications

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y

Low temperature oxidation of o-xylene with hydrogen peroxide in the presence of vanadium xerogels

Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride

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Phthalic Anhydride fromo-Xylene Catalysis: Science and Engineering

Cited by 154 publications

References 88 publications

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V4+/5+, and Al2O3 Coating of Zeolite Y

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V4+/5+, and Al2O3 Coating of Zeolite Y

Low temperature oxidation of o-xylene with hydrogen peroxide in the presence of vanadium xerogels

Deactivation properties of a high-productive vanadia-titania catalyst for oxidation of o-xylene to phthalic anhydride

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About

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y

Supported Vanadium Oxide Catalysts: Quantitative Spectroscopy, Preferential Adsorption of V^4+/5+, and Al₂O₃ Coating of Zeolite Y