Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture

Topka, Pavel; Balcar, Hynek; Rathouský, Jiřı́; Žilková, Naděžda; Verpoort, Francis; Čejka, Jiřı́

doi:10.1016/j.micromeso.2006.06.016

Cited by 78 publications

(77 citation statements)

References 35 publications

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“…The metathesis of 1-butene was performed in a gasphase fixed bed reactor [14]. The catalyst (20 mL) was activated in situ at 773 K for 16 h under a constant nitrogen flow of 20 mL (STP)/min.…”

Section: Reaction Studiesmentioning

confidence: 99%

“…Higher turn-over frequencies have been obtained in Re 2 O 7 -catalysed metathesis using ordered mesoporous alumina (OMA) as a support material rather than conventional aluminas [10][11][12][13]. Supporting Re 2 O 7 on mesoporous silica, such as MCM-41, also results in more active catalysts than supporting on commercial silica [14]. Bakala et al [15] argue that mesoporous materials as support materials for Re 2 O 7 -based metathesis catalysts do not have a decisive advantage over commercial oxides, but that the challenge lies in obtaining a good dispersion of the active site.…”

Section: Introductionmentioning

confidence: 99%

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On the Product Formation in 1-Butene Metathesis over Supported Tungsten Catalysts

2010

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1-Butene metathesis was performed over 8 wt% tungsten catalysts supported on silica, silica-alumina and c-Al 2 O 3 . Under the applied reaction conditions, 1-butene metathesis yields with a relatively large selectivity iso-butene in addition to the expected metathesis products. The isobutene selectivity is high for catalysts with a relative low activity and decreases with increasing metathesis activity. It is deduced that iso-butene formation involves surface tungsten complexes, whose formation inhibits the metathesis activity.

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Section: Reaction Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Product Formation in 1-Butene Metathesis over Supported Tungsten Catalysts

2010

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“…In general, supports are used, since they allow obtaining a high specific surface area, lead to adequate porosity, provide appropriate acidity and/or basicity, and tolerate elevated temperatures without suffering significant degradation (high thermal conductivity); such characteristics directly affect the catalytic performance (activity, selectivity, and stability) on certain specific reactions [4][5][6][7][8]. The catalytic supports most commonly used in the chemical industry are based on activated carbon, zeolites, molecular sieves, clays, alumina, and/or silica, among others [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

Oliveira

Paulista

Alencar

et al. 2017

Journal of Nanomaterials

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Aluminum oxide and/or silicon oxide-based supports were synthesized by proteic sol-gel method. The characterization was performed through the analysis of TG, XRD, FTIR, SEM, and N 2 physisorption. The XRD diffractograms showed an amorphous material profile. TG results indicate the total liberation of the organic and inorganic material in the calcination temperature used, occurring in different mass loss range. This piece of information was reaffirmed by the FTIR spectra, which presented characteristic bands of gelatin structure before calcinations which disappear in the spectrum of the solid after calcinations, indicating the loss of organic matter from gelatin after heat treatment. The spectra exhibited M-O stretching vibration at low wavenumbers after calcinations related to metal oxides. The acquired images by SEM suggest the obtaining of a highly porous material with very different characteristics depending on the composition of the support. The N 2 isotherms indicate the presence of a micro/mesoporous oxide with interesting textural properties, particularly for the supports containing aluminum and silicon oxide. The ethanol dehydration results showed greater selectivity to diethyl ether compared to ethylene. From the reaction data, the following order of acid strength was obtained: 2Si-Al > Si-2Al > Si-Al > Al, which is related to the Si-Al ratio.

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“…[4,5] At present, the olefins conversion technology (OCT) process licensed by Lummus Technology is the only commercial olefin metathesis technology producing propylene for the petrochemical industry. [6] The key step in olefin metathesis is the intermediacy of metal carbene active species and consequently the formation of unstable metallocyclobutane. Although, both homogeneous and heterogeneous catalysts can be used in metathesis, the heterogeneous catalysts are preferred due to their higher thermal stability, easy handling and possibility of reuse after regeneration.…”

Section: Introductionmentioning

confidence: 99%

“…[14] The other major issue with Re based catalyst is the high price of rhenium. [6] The molybdenum oxide based catalysts have received much attention because of their relatively low price, and comparable activity under mild reaction conditions. [15][16][17] The main limitation of molybdenum catalysis is that it requires a comparatively high pure feed stream.…”

Section: Introductionmentioning

confidence: 99%

Kinetics modelling of 2‐butene metathesis over tungsten oxide containing mesoporous silica catalyst

et al. 2014

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This article reports the activity, reaction mechanism and reaction kinetics of 2-butene metathesis over tungsten oxide containing mesoporous silica (SBA-15) catalyst. Physicochemical characterisation of the catalyst indicates that the dispersion and nature of tungsten oxide species on the catalyst are mainly responsible for the metathesis activity. The ample availability of Brønsted acid sites created by tetrahedrally co-ordinated tungsten species also enhances the metathesis reaction. The product analysis indicates that lower temperature favours the butene isomerisation, while higher temperature is required for metathesis. The high temperature is also responsible for cracking reactions. A kinetics model is developed based on the experimental observations and the possible reactions including isomerisation, metathesis and cracking. The model parameters are estimated by fitting the experimental data implemented in MATLAB. The estimated apparent activation energy of 2-butene isomerisation reaction was found to be the lowest (39.4 kJ/mol) among the competing reactions. The activation energy of cross metathesis of 2-butene and 1-butene, self-metathesis of 1-butene and 2-butene cracking are 71.3, 176.9 and 73.1 kJ/mol, respectively. These results are consistent to the product selectivity and the proposed reaction scheme, which suggests that the isomerisation of 2-butene gives 1-butene and it further reacts (cross metathesis) with 2-butene to produce propylene.

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Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture

Cited by 78 publications

References 35 publications

On the Product Formation in 1-Butene Metathesis over Supported Tungsten Catalysts

On the Product Formation in 1-Butene Metathesis over Supported Tungsten Catalysts

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

Kinetics modelling of 2‐butene metathesis over tungsten oxide containing mesoporous silica catalyst

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