Propylene Metathesis over Molybdenum Silicate Microspheres with Dispersed Active Sites

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Authors

SKODA David ZHU Ran HANULIKOVA Barbora STÝSKALÍK Aleš VYKOUKAL Vít MACHÁČ Petr ŠIMONÍKOVÁ Lucie KURITKA Ivo POLEUNIS Claude DEBECKER Damien P ROMAN-LESHKOV Yuriy

Year of publication 2023
Type Article in Periodical
Magazine / Source ACS Catalysis
MU Faculty or unit

Faculty of Science

Citation
web https://pubs.acs.org/doi/10.1021/acscatal.3c02045
Doi http://dx.doi.org/10.1021/acscatal.3c02045
Keywords molybdenum silicate; olefin metathesis; nonaqueous; microspheres; catalyst; propylene
Description In this work, we demonstrate that amorphous and porous molybdenum silicate microspheres are highly active catalysts for heterogeneous propylene metathesis. Homogeneous molybdenum silicate microspheres and aluminum-doped molybdenum silicate microspheres were synthesized via a nonaqueous condensation of a hybrid molybdenum biphenyldicarboxylatebased precursor solution with (3-aminopropyl)triethoxysilane. The as-prepared hybrid metallosilicate products were calcined at 500 degrees C to obtain amorphous and porous molybdenum silicate and aluminum-doped molybdenum silicate microspheres with highly dispersed molybdate species inserted into the silicate matrix. These catalysts contain mainly highly dispersed MoOx species, which possess high catalytic activity in heterogeneous propylene metathesis to ethylene and butene. Compared to conventional silica-supported MoOx catalysts prepared via incipient wetness impregnation (MoIWI), the microspheres with low Mo content (1.5-3.6 wt %) exhibited nearly 2 orders of magnitude higher steady-state propylene metathesis rates at 200 degrees C, approaching site time yields of 0.11 s-1.
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