Journal
ACS CATALYSIS
Volume 13, Issue 19, Pages 12970-12982Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.3c02045
Keywords
molybdenum silicate; olefin metathesis; nonaqueous; microspheres; catalyst; propylene
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In this study, we demonstrate that amorphous and porous molybdenum silicate microspheres are highly active catalysts for heterogeneous propylene metathesis. These microspheres were synthesized via a nonaqueous condensation method and showed significantly higher catalytic activity compared to conventional silica-supported catalysts.
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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