Influence of MgO-modified SBA-15 on the structure and catalytic activity of supported vanadium oxide catalysts

Scholz, Juliane; Walter, Anke; Ressler, Thorsten

doi:10.1016/j.jcat.2013.08.031

Cited by 30 publications

(24 citation statements)

References 36 publications

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“…As expected, with increasing metal loading, the edge energy decreased from 3.9 eV to 2.5 eV, indicating the increase in polymerization degree and the growth in domain size of vanadium oxides. [29][30][31] Previous studies have suggested that monovanadates, polyvanadate and V 2 O 5 formed at different vanadium densities:…”

Section: Structure Analysis Of Vo X /Al 2 O 3 Catalystsmentioning

confidence: 99%

Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation

et al. 2016

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Supported VO x catalysts are promising for propane dehydrogenation (PDH) due to relatively superior activity and stable performance upon regeneration.However, the nature of active sites and reaction mechanism during PDH over VO x based catalysts remains elusive. This paper describes the understanding of active species through attaining various fraction of V 5+ /V 4+ /V 3+ ions by adjusting surface vanadium density on an alumina support. The results presented a close relationship between E a /TOF and the fraction of V 3+ ion, indicating that the V 3+ was more active for PDH. In situ DRIFTS showed the same strong adsorbed species during both propane dehydrogenation and propylene hydrogenation. The results indicated that such intermediate may correspond with V species containing C=C double bond i.e. V-C 3 H 5 , and a reaction mechanism was proposed accordingly.

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Section: Structure Analysis Of Vo X /Al 2 O 3 Catalystsmentioning

confidence: 99%

Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation

et al. 2016

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“…2B). When the amount of V was increased to 10 wt.% (4 #), the peaks at 21.7°, 22.5°, and 32.1°, corresponding to a very small fraction of crystalline V 2 O 5 clusters, were observed, indicating that low content of V in HTS might be well incorporated into the framework of zeolite or homogeneously dispersed in zeolite lattices [25]. In comparison, the VO(acac) 2 -modified HTS showed an XRD pattern similar to that of VOSO 4 -modified HTS (2 #), indicating that doped SO 4 2À has no significant effect on the product structure.…”

Section: Photocatalytic Reactionsmentioning

confidence: 99%

Visible-light-responsive sulfated vanadium-doped TS-1 with hollow structure: Enhanced photocatalytic activity in selective oxidation of cyclohexane

Zhong

Qiao

Dai

et al. 2015

Journal of Catalysis

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“…Peak positions of absorption maxima and full width at half maximum are summarized in Table . Full width at half maximum of charge transfer (CT) transitions was correlated to be the same in the refinement . Three Gaussian functions were sufficient to simulate spectra of samples Cu1.1 and Cu3.7.…”

Section: Resultsmentioning

confidence: 99%

Correlation between Copper Oxide Particle Size and Selectivity towards Propylene Oxide in Selective Oxidation of Propene

et al. 2018

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Copper oxide catalysts supported on nanostructured silica SBA‐15 were synthesized with varying copper loadings in a range from 1.1 to 19.4 wt.%. Catalysts were structurally characterized by N2 physisorption, X‐ray diffraction and ex situ as well as in situ diffuse reflectance UV‐Vis spectroscopy. Copper oxide species contained Cu2+ in an octahedral configuration with a tetragonal distortion. Increasing the copper loading resulted in a decreasing optical band gap, which is associated with a growing particle size. Additionally, CuO/SBA‐15 samples were examined by temperature‐programmed reduction confirming a narrow particle size distribution. Structural evolution and catalytic activity were investigated during selective oxidation of propene focusing on product distribution of nucleophilic and electrophilic oxidation. Catalytic testing was carried out using an on‐line GC and MS coupled to a laboratory fixed‐bed reactor. All catalysts selectively oxidized propene to acrolein and propylene oxide (PO). With time on stream activity decreased while selectivity towards acrolein and PO increased. While selectivity towards PO increased with copper loading and, hence, copper oxide particle size, selectivity towards acrolein was largely independent of copper loading.

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Influence of MgO-modified SBA-15 on the structure and catalytic activity of supported vanadium oxide catalysts

Cited by 30 publications

References 36 publications

Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation

Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation

Visible-light-responsive sulfated vanadium-doped TS-1 with hollow structure: Enhanced photocatalytic activity in selective oxidation of cyclohexane

Correlation between Copper Oxide Particle Size and Selectivity towards Propylene Oxide in Selective Oxidation of Propene

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Influence of MgO-modified SBA-15 on the structure and catalytic activity of supported vanadium oxide catalysts

Cited by 30 publications

References 36 publications

Nature of the Active Sites of VOx/Al2O3 Catalysts for Propane Dehydrogenation

Nature of the Active Sites of VOx/Al2O3 Catalysts for Propane Dehydrogenation

Visible-light-responsive sulfated vanadium-doped TS-1 with hollow structure: Enhanced photocatalytic activity in selective oxidation of cyclohexane

Correlation between Copper Oxide Particle Size and Selectivity towards Propylene Oxide in Selective Oxidation of Propene

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Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation

Nature of the Active Sites of VO_x/Al₂O₃ Catalysts for Propane Dehydrogenation