Metathesis of 2-butene to propylene over W-mesoporous molecular sieves: A comparative study between tungsten containing MCM-41 and SBA-15

Bhuiyan, Tazul I.; Arudra, Palani; Akhtar, M. Naseem; Aitani, Abdullah M.; Abudawoud, Raed H.; Al-Yami, Mohammed; Al-Khattaf, S.

doi:10.1016/j.apcata.2013.07.034

Cited by 78 publications

(58 citation statements)

References 41 publications

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“…It is distinct that low-angle X-ray diagrams of all samples are wellresolved and exhibit three characteristic peaks corresponding to Bragg reflections on (100), (110), and (200) planes of mesoporous silicate materials, revealing the maintenance of original structure of p6 mm hexagonal symmetry [33]. In addition, the intensity of diffraction peak (100) of samples somewhat declines along with the increment of titanium additive dosage, attributing to the gradual destruction of long-range ordering of hexagonal pore structure [34] or the variation in electron density of titanium-incorporated materials, similar to tungsten incorporated MCM-41 [35]. A series of prominent diffraction peaks at nearly 25. ion radius of both [16].…”

Section: Resultsmentioning

confidence: 97%

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• A series of tungsten-titaniumcocontained SBA15 composites were fabricated by a simple synthetic route.• These samples showed enhanced catalytic performance in comparison to those comprising bare tungsten or titanium component.• The enhancement of photocatalytic behavior under visible-light irradiation was discussed. t r a c tA facile and one-step hydrothermal procedure was adopted to fabricate a series of W-Ti-SBA15 composites (WTS). These as-prepared composites were systematically characterized by a collection of analytic and spectroscopic techniques. It was found that dual phases of titanium and tungsten species coexisted in mesoporous structures of p6 mm hexagonal symmetry. In addition, these composites were visible-light responsive and exhibited enhanced photocatalytic capability toward degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) upon visible-light irradiation in comparison to samples containing single component of titanium or tungsten species. Specifically, the best candidate, sample 8%WTS0.7, had the largest apparent reaction rate constant that was nearly 1.2, 2.1, 2.2, and 5.7 times as high as those of 8%WS, TS0.7, WO 3 /TiO 2 , and N-TiO 2 , respectively. The enhancement of photocatalytic performance was mainly attributed to the well-matched band structures of both components and strengthened visiblelight adsorption ability, originating from the combination of titania with highly acidic WO 3 in SBA15 matrix with large specific surface areas. Active radical species were detected by trapping experiments and a possible photocatalytic mechanism was thus proposed.

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Section: Resultsmentioning

confidence: 97%

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…All samples display three pronounced diffraction peaks corresponding to (1 0 0), (1 1 0), and (2 0 0) reflections of mesoporous silicon-based materials, indicating that the involvement of tungsten species into SBA15 didn't significantly affect the structure of p6mm hexagonal symmetry [39]. The intensity of the (1 0 0) reflection decreases with the increase of tungsten species content, possibly owning to the change in electron density of tungsten incorporated materials, similar to XRD patterns of WO 3 -MCM-41 [35]. In addition, a gradual shift of the (1 0 0) diffraction peak toward lower angle with improving amounts of tungsten species is observed, revealing the large cell diameter as a result of the replacement of SiAO band by relatively long WAO band [36].…”

Section: Resultsmentioning

confidence: 51%

“…Actually, WO 3 -containing SBA15 have been synthesized and employed to catalyze a variety of chemical transformations, such as oxidation of cyclopentene [31,32], desulfurization [33], dehydration [34], and metathesis [35,36]. The incorporation of tungsten source into SBA15 matrix induces the formation of different tungsten species forms, among which isolated tungsten species or low oligomeric tungsten oxide species with terminal W@O groups are deemed as actives sites to initiate above catalytic reactions [31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of tungsten source into SBA15 matrix induces the formation of different tungsten species forms, among which isolated tungsten species or low oligomeric tungsten oxide species with terminal W@O groups are deemed as actives sites to initiate above catalytic reactions [31][32][33][34][35][36]. Though these tungsten species are powerful to catalyze organic transformations under conventional conditions, as far as we know, there are no reports focusing on the photocatalytic evaluation of tungsten-containing SBA15 under visible-light irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

Chang

Wang

Luo

et al. 2016

Journal of Colloid and Interface Science

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a b s t r a c tA series of tungsten-containing mesoporous SBA15 with different tungsten contents were prepared through a direct co-condensation sol-gel method and then analyzed by various techniques. XRD patterns revealed that the original mesoporous morphology was maintained after introducing tungsten species and forms of tungsten species were changed from incorporated tungsten to isolated tungsten species or low oligomeric tungsten oxide species, and finally to crystalline WO 3 with the increase of tungsten precursor content, which were also proven by HRTEM images, UV-Vis DRS, and FT-IR spectra. The W-SBA15 samples exhibited satisfactory photocatalytic performance toward degradation of dye Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP). In particular, the best candidate, sample 10%W-SBA15 showed an apparent reaction rate constant for RhB that was nearly 10 times as high as that of bulk WO 3 . The enhancement of photocatalytic capability was attributed to the mesoporous morphology with enlarged surface areas, negatively charged surface, and favorable tungsten forms such as incorporated tungsten, isolated tungsten or low oligomeric tungsten oxide species. In addition, active radicals trapping experiments and DMPO spin-trapping ESR spectra indicated that photogenerated holes were major oxidative species during photocatalysis.

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“…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. [7,8] In the open literature, supported rhenium, molybdenum and tungsten oxides are considered as the most promising candidates as metathesis catalysts. [9,10] Sang [11] and Balcar [12] reported high activity and selectivity of alumina, silica-alumina and mesoporous organised alumina supported rhenium (Re) oxide catalysts under mild reaction conditions.…”

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 2-butene to propylene over W-mesoporous molecular sieves: A comparative study between tungsten containing MCM-41 and SBA-15

Cited by 78 publications

References 41 publications

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

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

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