Direct gas-phase epoxidation of propene with nitrous oxide over modified silica supported <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si39.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>FeO</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math> catalysts

Ananieva, E. Yu.; Reitzmann, Andreas

doi:10.1016/j.ces.2004.09.006

Cited by 52 publications

(25 citation statements)

References 17 publications

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“…Analysis of acidity of the studied catalysts seems to deliver some explanation. According to Annanieva et al [9] the presence of relatively strong acidic sites (both Brönstedt and Lewis) results in the predominance of propionaldehyde as a product of PO isomerization. It has been found in an earlier study [15] that 5V/SBA-3 shows the highest acidity among the studied catalysts, while the acidity of 5V/SBA-15, 5V/MCM-41, and 5V/MCF is successively lower.…”

Section: Discussionmentioning

confidence: 99%

“…Application of nitrous oxide for direct propane Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s1056 2-018-2420-6) contains supplementary material, which is available to authorized users. and propene oxidation performed over iron modified silicas evidenced the usefulness of that oxidant for propane oxydehydrogenation (ODH) [7] as well as for propene epoxidation [8,9]. Iron modified zeolites have also been used for the new technology of benzene to phenol oxidation with nitrous oxide as an oxidant [10,11].…”

Section: Introductionmentioning

confidence: 99%

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MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

et al. 2018

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Vanadium modified mesocellular silica foams (MCF) materials (V content ca. 3 and 5 wt%) prepared by the impregnation method show mainly isolated or low-polymeric VO x species, which was confirmed by means of Raman spectroscopy and DR UV-Vis. Textural measurements, and also XRD and TEM results indicate that the characteristic mesocellular structural features of MCFs are preserved after vanadium incorporation. The MCF-supported vanadia catalysts exhibit much higher propene conversion and propene oxide productivity when compared to vanadium modified mesoporous silicas of 2D structure, demonstrating that apart from the presence of highly dispersed isolated vanadium species, internal molecular transport within three-dimensional ultra large pores of MCF materials also plays an important role in gas-phase propene epoxidation. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

et al. 2018

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“…E. Ananieva et al studied the effect of Na + and Cs + in the acidity of the support to decrease the possibility of PO polymerization [24]. In addition, B. Horváth et al focused their work on the addition of the alkaline promotor K + (as KCl) in order to enhance the catalytic properties of the iron containing catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…In the propylene epoxidation reaction using iron-based catalysts, the use of a more oxidant compound, such as N 2 O at 350ºC, is necessary for the PO synthesis in the gas-phase reaction [24][25][26][27]. E. Ananieva et al studied the effect of Na + and Cs + in the acidity of the support to decrease the possibility of PO polymerization [24].…”

Section: Introductionmentioning

confidence: 99%

One step-synthesis of highly dispersed iron species into silica for propylene epoxidation with dioxygen

García-Aguilar

Miguel-García

Juan-Juan

et al. 2016

Journal of Catalysis

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Well dispersed iron catalysts were synthesized in silica (Fe 0.0X SiO 2 ) by a one-step synthesis procedure. These materials were tested in the propylene epoxidation reaction with gaseous O 2 . The influence of the iron metal loading on the iron incorporation and distribution in the support (both influenced by the synthetic procedure) were thoroughly studied (conversion, generation and selectivity). Electron Microscopy and UltraViolet-Visible (UV-VIS), Raman and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy techniques were used to analyze the iron distribution in the catalysts and to probe its incorporation into the silica framework. Insitu FTIR was also used to analyze the interaction between propylene and iron-based catalysts. This is a previous version of the article published in Journal of Catalysis. 2016Catalysis. , 338: 154-167. doi:10.1016Catalysis. /j.jcat.2016 2 Computational calculations considering a single-site iron catalyst incorporated into the silica structure show a possible interaction between O 2 and the incorporated iron atom and the olefin bond and the acidic proton neighboring the iron species which favours the reaction between the two molecules near the iron atom.

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“…Thus, they are not preferable due to their environmental and economical drawbacks [2]. Because of the deficiencies of the aforementioned PO production processes, novel methods of producing PO have been explored which included direct oxidation of propylene using various catalytic systems and proper oxidants, such as H 2 O 2 [3][4][5] O 2 -H 2 gas mixture [6][7][8][9] and N 2 O [10,11]. However, high costs of these oxidants restrict the commercialization of these processes.…”

Section: Introductionmentioning

confidence: 99%

NaCl-Promoted CuO–RuO2/SiO2 Catalysts for Propylene Epoxidation with O2 at Atmospheric Pressures: A Combinatorial Micro-reactor Study

et al. 2014

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A combinatorial approach is used to investigate several alkali metals promoted Cu-Ru binary oxide catalysts with improved catalytic performance in the propylene partial oxidation. 2 %Cu/5 %Ru/c-SiO 2 catalyst had the best yield with high propylene conversion and propylene oxide (PO) selectivity. Among the promoters screening in the study, NaCl promotion significantly increased the PO selectivity accompanied by some attenuation in the total propylene conversion. It was proposed that binary oxide catalysts revealed a greater number of exposed catalytically active adsorption sites as compared to monometallic oxide counterparts according to XPS and FTIR results. Besides NaCl addition alters the structure, yielding a significantly improved PO selectivity without any change in the particle size of Cu and Ru oxide according to XRD analysis.

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Direct gas-phase epoxidation of propene with nitrous oxide over modified silica supported FeOx catalysts

Cited by 52 publications

References 17 publications

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

One step-synthesis of highly dispersed iron species into silica for propylene epoxidation with dioxygen

NaCl-Promoted CuO–RuO2/SiO2 Catalysts for Propylene Epoxidation with O2 at Atmospheric Pressures: A Combinatorial Micro-reactor Study

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