Kinetic study of propene oxide and water formation in hydro-epoxidation of propene on Au/Ti–SiO2 catalyst

Kanungo, S.; Ferrández, D.M. Pérez; d’Angelo, M.F. Neira; Schouten, J.C.; Nijhuis, T.A.

doi:10.1016/j.jcat.2016.03.019

Cited by 40 publications

(31 citation statements)

References 25 publications

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“…The detailed support preparation can be found in the literature. 8,9 Catalyst characterization Transmission Electron Microscopy (TEM) was used to determine the size distribution of the Au particles in both catalysts. The TEM images were recorded using a FEI Tecnai G2 Sphera transmission electron microscope at an accelerating voltage of 200 kV.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Some examples of active catalysts are gold dispersed on TS-1, Ti-SiO 2 , Ti-MCM-41 and Ti-SBA-15. [5][6][7][8][9][10] An inherent drawback of this approach is the formation of an excessive amount of water by oxidation of hydrogen. Overall, the low H 2 efficiency constitutes a major economic hurdle.…”

Section: Introductionmentioning

confidence: 99%

“…18 An advantage of replacing H 2 with CO is that it largely suppresses the formation of propane, 19 which is an undesirable side reaction observed. 8,19,20 These authors proposed that the reaction propagates via oxygen vacancy formation on the titania support. They also argued that this mechanism may also be operative in the propene/oxygen/hydrogen case, which is in discord with the well-accepted mechanism involving surface hydrogen peroxide/hydroperoxo (HOOH/˙OOH) species.…”

Section: Introductionmentioning

confidence: 99%

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Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

Kanungo

d’Angelo

et al. 2017

Catal. Sci. Technol.

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Section: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

Kanungo

d’Angelo

et al. 2017

Catal. Sci. Technol.

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“…In addition to silver and gold, copper catalysts exhibit good selectivity as propene epoxidation catalysts . While all three metal catalysts can form PO with gaseous oxygen as oxidant, currently only gold and silver can form PO with a good selectivity using a mixture of oxygen and hydrogen ,,. In contrast to silver and gold metal catalysts, both metallic Cu and cationic Cu + species are active epoxidation species in copper catalysts ,.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] While all three metal catalysts can form PO with gaseous oxygen as oxidant, currently only gold and silver can form PO with a good selectivity using a mixture of oxygen and hydrogen. [9,17,18] In contrast to silver and gold metal catalysts, both metallic Cu and cationic Cu + species are active epoxidation species in copper catalysts. [9,19] Valence of active copper species is crucial, considering copper oxide can be used as epoxidation catalyst without reductive pretreatment.…”

Section: Introductionmentioning

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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Combining trace Pt with surface silylation to boost Au/uncalcined TS‐1 catalyzed propylene epoxidation with H₂ and O₂

Wang

Zhang

et al. 2021

AIChE Journal

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Modification of bifunctional Au‐Ti catalysts for direct epoxidation of propylene with H2 and O2 is of burgeoning interest for potential commercialization requirements with desirable overall catalytic performance. Herein, we report a strategy by combining the addition of trace Pt into Au particles to enhance hydroperoxide species formation with the surface silylation to promote propylene oxide (PO) desorption. The resultant catalyst, that is, silylated Au20Pt1/uncalcined TS‐1, gives rise to significantly enhanced propylene conversion of 11%, PO selectivity of 88%, and H2 efficiency of 41%. The underlying nature of the above enhanced performance is elucidated by multiple techniques, such as high‐angle annular dark‐field scanning transmission electron microscopy, X‐ray photoelectron spectroscopy, Fourier transform infrared spectra, and theoretical calculations. The insights revealed here, the synergy of Au‐Pt‐Ti triple active sites together with the surface silylation, could guide the rational design of Au‐Ti catalysts for propylene epoxidation to boost PO production.

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Kinetic study of propene oxide and water formation in hydro-epoxidation of propene on Au/Ti–SiO2 catalyst

Cited by 40 publications

References 25 publications

Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

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

Combining trace Pt with surface silylation to boost Au/uncalcined TS‐1 catalyzed propylene epoxidation with H₂ and O₂

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Kinetic study of propene oxide and water formation in hydro-epoxidation of propene on Au/Ti–SiO2 catalyst

Cited by 40 publications

References 25 publications

Epoxidation of propene using Au/TiO2: on the difference between H2 and CO as a co-reactant

Epoxidation of propene using Au/TiO2: on the difference between H2 and CO as a co-reactant

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

Combining trace Pt with surface silylation to boost Au/uncalcined TS‐1 catalyzed propylene epoxidation with H2 and O2

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Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

Epoxidation of propene using Au/TiO₂: on the difference between H₂ and CO as a co-reactant

Combining trace Pt with surface silylation to boost Au/uncalcined TS‐1 catalyzed propylene epoxidation with H₂ and O₂