NaOH modified WO3/SiO2 catalysts for propylene production from 2-butene and ethylene metathesis

Maksasithorn, Surasa; Debecker, Damien P.; Praserthdam, Piyasan; Panpranot, Joongjai; Suriye, Kongkiat; Ayudhya, Sirachaya Kunjara Na

doi:10.1016/s1872-2067(12)60760-8

Cited by 31 publications

(22 citation statements)

References 38 publications

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“…Catalysts pretreated in the presence of either He or propene slowly transform the mono-oxo sites to dioxo sites, thereby reducing the activation period usually observed in these catalysts [ 45 ]. Interestingly WO 3 /SiO 2 catalyst ion-exchanged with NaOH also displayed a shorter induction period with a marginal decrease in the isomerization activity [ 47 ]. While the metathesis mechanism under reaction conditions is not yet fully understood, it is clear that the metathesis activity and selectivity are tunable with acidity in metal-incorporated silicates and remains to be explored in more detail, especially with regard to bimetallic formulations.…”

Section: Resultsmentioning

confidence: 99%

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Ramanathan

Subramaniam

2018

Molecules

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A relatively new class of three-dimensional ordered mesoporous silicates, KIT-6, incorporated with Earth-abundant metals such as Zr, Nb, and W (termed as M-KIT-6), show remarkable tunability of acidity and metal dispersion depending on the metal content, type, and synthetic method. The metal-incorporation is carried out using one-pot synthesis procedures that are amenable to easy scale-up. By such tuning, M-KIT-6 catalysts are shown to provide remarkable activity and selectivity in industrially-significant reactions, such as alcohol dehydration, ethylene epoxidation, and metathesis of 2-butene and ethylene. We review how the catalytic properties of M-KIT-6 materials may be tailored depending on the application to optimize performance.

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Section: Resultsmentioning

confidence: 99%

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Ramanathan

Subramaniam

2018

Molecules

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“…The Raman spectra of the catalysts are shown in Figs and S3. The fresh SiW/SiO 2 and PW/SiO 2 catalysts calcined at 450 °C, regardless of the loading amount, show Raman characteristic bands at 807, 715 and 272 cm −1 , attributed to the symmetric stretching mode of WO, the bending mode of WO and the deformation mode of WOW in crystalline WO 3 , respectively . The characteristic peak intensity of WO 3 increases with an increase of loading, demonstrating that high loading would result in the agglomeration of WO 3 on the sample surfaces .…”

Section: Resultsmentioning

confidence: 95%

“…However, the PW Keggin structure decomposes and forms monoclinic WO 3 crystallites (JCPDS 43‐1035) at calcination temperatures of 450 and 550 °C (Fig. : patterns c and e) …”

Section: Resultsmentioning

confidence: 99%

Acrylic acid synthesis via condensation of acetic acid and formaldehyde catalyzed by silica aerogel‐supported SiW/PW/PMo oxides

Shen

Yin

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The demand for acrylic acid continues to increase rapidly due to its widespread application. The traditional production of acrylic acid originates from non-sustainable propylene oxidation. Considering the environmental requirements and economic sustainable development, it is of great significance to exploit new routes to replace the petrochemical route.RESULTS: Comparison of silica aerogel-supported SiW/PW/PMo catalysts shows that PW/SiO 2 catalyst with 30 wt% loading and calcined at 450°C provides the best performance for the condensation of acetic acid and formaldehyde. Increasing the reaction temperature from 340 to 400°C leads to the best acrylic acid selectivities of 87.1-84.2% at formaldehyde conversions of 35.7-45.2%. CONCLUSIONS: The catalytic performance of PW/SiO 2 catalyst increases with increasing PW loading. The acidic and basic sites of the catalyst, especially the weak ones, are of vital importance to the synthesis of acrylic acid via the aldol condensation of acetic acid and formaldehyde.

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“…The ammonia desorption peaks of the non-calcined WO 3 /SiO 2 catalysts occurred at higher temperature than the calcined catalysts, indicating the higher acid strength as stronger acidity. 8,32 In addition, increasing the pretreatment temperature caused the ammonia desorption peak to slightly shi to lower temperature, indicating lower acid strength.…”

Section: Acidity Of the Catalystsmentioning

confidence: 99%

Effects of calcination and pretreatment temperatures on the catalytic activity and stability of H₂-treated WO₃/SiO₂ catalysts in metathesis of ethylene and 2-butene

et al. 2018

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The effects of calcination and pretreatment temperatures of the H 2 -treated WO 3 /SiO 2 catalysts in metathesis of ethylene and 2-butene to propylene were investigated. The results showed that pretreatment with pure hydrogen over the non-calcined catalysts resulted in higher activity and stability than the calcined catalysts, and the hydrogen pretreatment temperature at 650 C offered the highest 2-butene conversion and propylene selectivity. The calcination of the catalyst before hydrogen pretreatment was proved to be unnecessary. As revealed by various characterization results from N 2 physisorption, XRD, TEM, UV-Vis, Raman, in situ H 2 -TPR, in situ NH 3 -DRIFTS and in situ NH 3 -TPD techniques, activity of the metathesis of ethylene and 2-butene to propylene was related to tungsten dispersion on the support, WO 2.83 and WO 2 phase composition, and isolated surface tetrahedral tungsten oxide species. The stability of the metathesis reaction was also related to the total acidity and the acid sites of both Brønsted and Lewis acid sites.

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NaOH modified WO3/SiO2 catalysts for propylene production from 2-butene and ethylene metathesis

Cited by 31 publications

References 38 publications

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Acrylic acid synthesis via condensation of acetic acid and formaldehyde catalyzed by silica aerogel‐supported SiW/PW/PMo oxides

Effects of calcination and pretreatment temperatures on the catalytic activity and stability of H₂-treated WO₃/SiO₂ catalysts in metathesis of ethylene and 2-butene

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NaOH modified WO3/SiO2 catalysts for propylene production from 2-butene and ethylene metathesis

Cited by 31 publications

References 38 publications

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Metal-Incorporated Mesoporous Silicates: Tunable Catalytic Properties and Applications

Acrylic acid synthesis via condensation of acetic acid and formaldehyde catalyzed by silica aerogel‐supported SiW/PW/PMo oxides

Effects of calcination and pretreatment temperatures on the catalytic activity and stability of H2-treated WO3/SiO2 catalysts in metathesis of ethylene and 2-butene

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Effects of calcination and pretreatment temperatures on the catalytic activity and stability of H₂-treated WO₃/SiO₂ catalysts in metathesis of ethylene and 2-butene