Enhanced metathesis activity of low loading Re2O7/Al2O3 catalysts for propylene production by using aluminum nitrate as Al2O3 precursor

Vorakitkanvasin, Siriporn; Ayudhya, Sirachaya Kunjara Na; Suriye, Kongkiat; Praserthdam, Piyasan; Panpranot, Joongjai

doi:10.1016/j.apcata.2016.01.008

Cited by 17 publications

(13 citation statements)

References 23 publications

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“…A number of studies in the literature suggested that Lewis acidity plays signicant role in metathesis reaction. 11,21 The present work, however, revealed various Lewis acid sites with different bond strengths on the supported Re oxide catalysts. It was found that the higher ratios of the weak Lewis acid bands at wavenumber 1280 cm À1 /1622 cm À1 led to higher metathesis activity as observed in the order:…”

Section: Activity-acidity Relationshipcontrasting

confidence: 48%

“…3,[5][6][7] Surface structures of the active isolated ReO 4 species on alumina have been identied by a number of studies based on Raman, in situ Raman, and in situ IR spectroscopy. [8][9][10][11][12][13] The surface rhenium oxide species presented on silica-alumina support were similar to those of alumina supported ones but they were inactive on the Si-OH. 14 Besides, the catalytic performances of supported rhenium oxide-based catalysts have oen been correlated to either Bronsted 15 or Lewis acid sites.…”

Section: Introductionmentioning

confidence: 77%

“…The most active NHSG catalyst in the cross-metathesis of ethylene and butene to propylene was found on the catalysts containing the highest amount of acidic sites with well dispersed rhenium oxide species and high surface areas. A recent study from our group 11 showed that the higher acidic OH group on the alumina support provided higher Lewis acid sites necessary for the formation of the rhenium oxide active species whereas the higher Bronsted acidity led to higher amount of coke and C 5+ products. In addition, the acid strength of Lewis acid sites appeared to be another important factor determining metathesis activity of supported Re 2 O 7 catalysts.…”

Section: Introductionmentioning

confidence: 93%

“…The bands at 1280 and 1622 cm À1 assigned to adsorbed NH 3 on Lewis acid sites and the bands at 1470 and 1686 cm À1 assigned to NH 4 + on Bronsted acid sites were detected for all the rhenium oxide catalysts. 11,[21][22][23] Additional broad bands at 1240, 1405, 1506, 1570 cm À1 were assigned to NH 2 vibration. [23][24][25] The amounts of Bronsted and Lewis acid sites calculated from the integrated peak areas based on the in situ DRIFTS results are given in Table 1.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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In situ-DRIFTS study: influence of surface acidity of rhenium-based catalysts in the metathesis of various olefins for propylene production

et al. 2017

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Section: Activity-acidity Relationshipcontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 93%

Section: Catalyst Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

In situ-DRIFTS study: influence of surface acidity of rhenium-based catalysts in the metathesis of various olefins for propylene production

et al. 2017

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“…The most important Re 2 O 7 /Al 2 O 3 system is characterized by high catalytic activity and selectivity in low a temperature (20–100°C), which is an important advantage. It is used in the metathesis of gaseous and/or liquid alkenes (also these with various functional groups) and acyclic alkenes with functional groups [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. The Re 2 O 7 /Al 2 O 3 system was also used in large-scale technologies, e.g., FEAST [20,21] and META-4 ® [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts

et al. 2019

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Rhenium is an element that exhibits a broad range of oxidation states. Synthesis paths of selected rhenium compounds in its seventh oxidation state, which are common precursors for organic reaction catalysts, were presented in this paper. Production technologies for copper perrhenate, aluminum perrhenate as well as the ammonia complex of cobalt perrhenate, are thoroughly described. An ion exchange method, based on Al or Cu metal ion sorption and subsequent elution by aqueous perrhenic acid solutions, was used to obtain perrhenates. The produced solutions were neutralized to afford the targeted aluminum perrhenate and copper perrhenate products in high purity. The developed technologies allow one to manage the wastes from the production of these perrhenates as most streams were recycled. Hexaamminecobalt(III) perrhenate was produced by a newly developed method enabling us to produce a high purity compound in a reaction of spent hexaamminecobalt(III) chloride solution with a perrhenic acid. All prepared compounds are the basis for precursor preparation in organic catalysis.

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Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Debecker

2017

The Chemical Record

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Heterogeneous catalysts can be prepared by different methods offering various levels of control on the final properties of the solid. In this account, we exemplify bottom-up preparation routes that are based on the sol-gel chemistry and allow to tailor some decisive properties of solid catalysts. First, an emulsion templating strategy is shown to lead to macrocellular self-standing monoliths with a macroscopic 3D structure. The latter can be used as catalyst or catalyst supports in flow chemistry, without requiring any subsequent shaping step. Second, the aerosol-assisted sol-gel process allows for the one-step and continuous production of porous mixed oxides. Tailored textural properties can be obtained together with an excellent control on composition and homogeneity. Third, the application of non-hydrolytic sol-gel routes, in the absence of water, leads to mixed oxides with outstanding textural properties and with peculiar surface chemistry. In all cases, the resulting catalytic performance can be correlated with the specificities of the preparation routes presented. This is exemplified in catalytic reactions in the fields of biomass conversion, petro chemistry, enantioselective organic synthesis, and air pollution mitigation.

show abstract

Enhanced metathesis activity of low loading Re2O7/Al2O3 catalysts for propylene production by using aluminum nitrate as Al2O3 precursor

Cited by 17 publications

References 23 publications

In situ-DRIFTS study: influence of surface acidity of rhenium-based catalysts in the metathesis of various olefins for propylene production

In situ-DRIFTS study: influence of surface acidity of rhenium-based catalysts in the metathesis of various olefins for propylene production

Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

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