Abstract
A series of 3.0Mo/MCM-22-Al 2O 3 catalysts with γ-Al 2O 3 contents in the range of 0-100 wt% were prepared and applied in the metathesis reaction of ethene and butene-2. Addition of γ-Al 2O 3 did not affect the structure of MCM-22 zeolite as evidenced by XRD and N 2 adsorption measurements. It was deduced from TPR experiments that γ-Al 2O 3 phase favored the formation of polymolybdate or multilayered Mo oxide, while more Al 2(MoO 4) 3 species were generated over MCM-22 zeolites. Alumina content in the support was directly related to the metathesis activity of ethene and butene-2 to propene. Mo species with higher valence (Mo 6+ or Mo 5+) contributed more to the excellent performance of catalyst than metallic Mo. The best catalyst activity and stability was obtained over 3.0Mo/(MCM-22-30%Al 2O 3) under the reaction condition of 1.0 MPa and 125 γC using N 2 as the pretreatment gas.
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