Oxidation of alkanes into olefins on the polyoxide catalysts

Тунгатарова, С.А.; Abdukhalykov, D.B.; Baizhumanova, T.S.; Komashko, L. V.; Grigorieva, V. P.; Chanysheva, I. S.

doi:10.1016/j.cattod.2015.03.004

Cited by 7 publications

(7 citation statements)

References 43 publications

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“…The N‐H stretching vibration over 3000 cm −1 was covered by broad bands of BNP hydroxyl group vibrations in this region . The IR spectrum for PMo‐AFBNP (Figure b) and SiMo‐AFBNP (Figure c) showed three new bands at 950–955, 875–890 and 785–800 cm −1 in addition to the AFBNP, which were assigned to the stretching vibrations of terminal M=O, bridged corner shared, M‐O b ‐M, and bridged edge shared, M‐O c ‐M, octahedrons of the supported HPA, respectively . The IR spectrum for PW‐AFBNP (Figure d) and SiW‐AFBNP (Figure e) also showed new bands at 970–975, 885–900 and 795–815 cm −1 , which were assigned similarly.…”

Section: Resultsmentioning

confidence: 93%

“…Supporting HPA on proper solid beds, such as cellulose, zeolites, silica, alumina, zirconia, carbon fiber, MCM‐41, SBA‐15, carbon nanotube, Ta 2 O 5 , Nb 2 O 5 and TiO 2 , could improve their catalytic activity by enhancement of their thermal stability and compensate for their low surface area . Impregnation and adsorption are the most conventional and simplest methods for supporting HPA on solid catalytic beds. These processes rarely create suitable bonding interactions between HPA and support.…”

Section: Introductionmentioning

confidence: 99%

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Boehmite nano‐particles functionalized with silylpropylamine‐supported Keggin‐type heteropolyacids: Catalysts for epoxidation of alkenes

Mirzaee

Bahramian

Ashrafian

et al. 2017

Applied Organom Chemis

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Boehmite nano‐particles with a high degree of surface hydroxyl groups were covalently functionalized by 3‐(trimethoxysilyl)‐propylamine to support H3[PMo12O40], H3[PW12O40], H4[SiMo12O40] and H4[SiW12O40] Keggin‐type heteropolyacids. After characterization of these catalysts by FT‐IR, powder X‐ray diffraction, TG/differential thermal analysis, CHN, inductively coupled plasma and transmission electron microscopy techniques, they were applied to the epoxidation of cis‐cycloocten. The progress of the reactions was investigated by gas–liquid chromatography, and the catalytic procedures were optimized for the parameters involved, such as the solvent and oxidant. The results showed that 25 mg of supported H3[PMo12O40] catalyst in 1 ml C2H4Cl2 with 0.5 mmol cyclooctene and 1 mmol tert‐butylhydroperoxide at reflux temperature gave 98% yield over 15 min. Recycling experiments revealed that these nanocatalysts could be repeatedly applied up to five times for a nearly complete epoxidation of cis‐cycloocten. The optimized experimental conditions were also used successfully for the epoxidation of some other alkenes, such as cyclohexene, styrene and α‐methyl styrene.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Boehmite nano‐particles functionalized with silylpropylamine‐supported Keggin‐type heteropolyacids: Catalysts for epoxidation of alkenes

Mirzaee

Bahramian

Ashrafian

et al. 2017

Applied Organom Chemis

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“…The optimal reaction conditions: C2H6 -20.0%, O2 -2.5%, N2 -57.5%, H2O -20.0%, space velocity -8000 h −1 , contact time -0.45 s were installed. Ethylene yields exceeding 42% with selectivity above 87% were obtained over novel Pb-Si-Mo heteropoly compound catalysts under oxidative dehydrogenation of ethane at 1023 K [29].…”

Section: Introductionmentioning

confidence: 99%

“…The investigations on influence of the nature of carrier including zeolites on process are well known. The investigations of catalytic activity in reaction of oxidative conversion of С3-С4 alkanes into oxygen-containing compounds (alcohols, aldehydes, acids, and ketones), С2-С4 olefins and H2 over W-, Mo-HPC with P and Si as central atoms supportedon Si-containing oxide carriers are developed[27][28][29][30][31][32][33][34][35][36].…”

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confidence: 99%

Catalytic Oxidation of C<sub>3</sub>-C<sub>4</sub> Mixture into Industrially Important Chemical Products

Baizhumanova¹,

Тунгатарова²,

Zheksenbaeva³

et al. 2018

Preprint

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The processing of alkanes (the main components of natural gas) for obtaining of industrially important chemical products is one of the most urgent environmental problems, because the major share of raw materials are burned in torches. Therefore, the main goal of the work is the development of catalysts and conditions for obtaining of important petrochemical products from light alkanes. For the preparation of catalysts, Mo, Cr and Ga oxide catalysts as well as catalysts based on heteropoly compounds, supported on natural materials were used. The catalysts were prepared by the capillary impregnation method and used in oxidative conversion in a flowing unit while varying the process conditions. It has been determined that 5 and 10% MoCrGa catalysts are optimal for obtaining of liquid and gaseous products, and 1% catalyst is more favorable for the synthesis of gaseous products. Supported catalysts from heteropoly acid Н3PW12O40 are highly active in oxidative dehydrogenation and cracking processes, which are concurrent. High activity is caused by dispersity of catalysts, formation of crystal hydrates and amorphous phase of heteropoly acid in a condition of interaction with carrier. Maximum yield of C2H4 - 35.2% at 973 K, C3H6 – 20.0% and C4H8 – 14.3% at 773 К were observed.

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“…Heteropoly compounds (HPCs) have attracted great attention as effective catalysts for redox and acid-catalyzed reactions, especially in the production processes of petroleum and coal downstream products, such as the oxidative dehydrogenation of alkanes [1,2], the oxidation of propylene/propane to acrolein/acrylic acid [3,4], the oxidation of iso-butane/methacrolein (MAL) to methacrylic acid (MAA) [5,6], and an increasing number of newly emerging fields [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

Zhang

Wang

et al. 2016

Catalysts

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Abstract:The composition, structural evolution and the related property variations of mixed cesium/ammonium acidic salts of heteropolyacids were investigated in detail by tracking and analyzing the initial precipitates, evaporation residues and the calcined products in their preparation process. Results show that V cannot completely enter the heteropolyanions in the initial precipitates when the Cs + added amount is low, and the increase in Cs + adding amount improves the substitution of V for Mo in the heteropolyanions. Both the initial precipitates and the evaporation residues are mixtures of cesium and ammonium salts of heteropolyacids before calcination. Thermal treatment causes the decomposition of the ammonium salts and the formation of single-phase solid solutions from mechanical mixtures. The calcined products of the initial precipitates and the evaporation residues vary greatly in textural properties. The determinants of the catalytic performance for the oxidation of methacrolein to methacrylic acid are acidity and specific surface area of the compounds. The increase in specific surface area mainly improves the conversion of methacrolein, but not the selectivity of methacrylic acid. Insufficient acidity caused by high Cs + content in the compounds is responsible for the low selectivity.

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Oxidation of alkanes into olefins on the polyoxide catalysts

Cited by 7 publications

References 43 publications

Boehmite nano‐particles functionalized with silylpropylamine‐supported Keggin‐type heteropolyacids: Catalysts for epoxidation of alkenes

Boehmite nano‐particles functionalized with silylpropylamine‐supported Keggin‐type heteropolyacids: Catalysts for epoxidation of alkenes

Catalytic Oxidation of C<sub>3</sub>-C<sub>4</sub> Mixture into Industrially Important Chemical Products

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

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