Gas-phase metathesis of 1-hexene over a WO3/SiO2 catalyst: Search for optimal reaction conditions

Lokhat, David; Starzak, Maciej; Stelmachowski, M.

doi:10.1016/j.apcata.2008.09.006

Cited by 29 publications

(14 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and W 5? [6,23]. The reduction can be easily understood because of the strong reducibility of feedstock (2-butene and ethene) at reaction temperature (200°C).…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…The reaction takes place in the presence of a WO 3 /SiO 2 catalyst at [260°C and 30-35 bar [4]. WO 3 /SiO 2 catalyst is of the most commonly used among supported metathesis catalysts [5,6], and in many cases there are indications of chemical interaction between the silica support and tungsten compounds [7]. The metathesis activity is highly dependent on the structure and properties of surface tungsten compound influenced by the loading amount of W [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of tungsten oxide loading on metathesis activity of ethene and 2-butene over WO3/SiO2 catalysts

Zhao

Chen

Gao

et al. 2009

Transition Met Chem

View full text Add to dashboard Cite

The metathesis of ethene and 2-butene to propene was studied over WO 3 /SiO 2 catalysts with various WO 3 loadings (2, 4, 8, 12, 16, and 24 wt%). The 2-butene conversion and propene selectivity increased greatly with WO 3 loading increasing from 2 to 8 wt%, reached maximum at 8-12 wt% WO 3 loading, and then decreased when the WO 3 loading was higher than 12 wt%. From the above results and taking the economics into account, the optimal amount of WO 3 loading was *8 wt%. The catalysts were characterized by physico-chemical and spectroscopic techniques to elucidate the effect of different tungsten oxide loadings on the metathesis reactivity of ethene and 2-butene. The characterization data indicated that three types of tungsten species (i.e., surface tetrahedral tungsten species, surface octahedral polytungstate species, and WO 3 crystallites) were present in the catalysts. It was found that WO 3 was not the active centers, and surface tetrahedral tungsten species might be more active than octahedral polytungstate species in metathesis reaction. The reduced form of tungsten species [W ?4 , W ?5 , and W ?(6-y) (0 \ y \ 1)] may be the suitable state of W species acting as metathesis active centers.

show abstract

“…and W 5? [6,23]. The reduction can be easily understood because of the strong reducibility of feedstock (2-butene and ethene) at reaction temperature (200°C).…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of tungsten oxide loading on metathesis activity of ethene and 2-butene over WO3/SiO2 catalysts

Zhao

Chen

Gao

et al. 2009

Transition Met Chem

View full text Add to dashboard Cite

show abstract

“…Due to the rising demand for propylene in the petrochemical industry, the metathesis of 2-butene and ethylene is now used for on-purpose propylene production [1,2]. Several catalysts including supported MoO3 [3,4], Re2O7 [5][6][7], and WO3 [8][9][10] are known to catalyze the reaction.…”

Section: Introductionmentioning

confidence: 99%

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

Maksasithorn

Debecker

Praserthdam

et al. 2014

Chinese Journal of Catalysis

View full text Add to dashboard Cite

“…In a previous study, we investigated the performance of an undoped 8 wt % WO 3 /SiO 2 catalyst for the metathesis of 1-hexene in a gas-phase fixed-bed reactor [6]. For reaction temperatures between 420°C and 500°C, a broad product distribution was obtained, with both branched and linear alkenes up to C 16 .…”

Section: Introductionmentioning

confidence: 99%

Metathesis of 1‐Hexene over Heterogeneous Tungsten‐Based Catalysts

2015

Self Cite

View full text Add to dashboard Cite

1-Hexene metathesis was performed over standard and potassium-doped WO 3 /SiO 2 catalysts. The samples were tested at various reaction temperatures, molar feed compositions, and space times. Under the applied reaction conditions, doping with potassium reduced the isomerization and cracking activity of the catalyst by at least half and improved the yield of detergent-range alkenes twofold. However, increasing the potassium loading to a higher amount resulted in a significant reduction in the metathesis activity as both Brønsted and Lewis acid sites were affected. Optimum operating conditions for the yield of detergent-range alkenes were identified using response surface methodology.

show abstract

Gas-phase metathesis of 1-hexene over a WO3/SiO2 catalyst: Search for optimal reaction conditions

Cited by 29 publications

References 21 publications

Effect of tungsten oxide loading on metathesis activity of ethene and 2-butene over WO3/SiO2 catalysts

Effect of tungsten oxide loading on metathesis activity of ethene and 2-butene over WO3/SiO2 catalysts

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

Metathesis of 1‐Hexene over Heterogeneous Tungsten‐Based Catalysts

Contact Info

Product

Resources

About