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Investigations into the C4 olefin metathesis over Mo/Al2O3: Effects of support nature and pretreatment conditions on the product distribution

Paper ID Volume ID Publish Year Pages File Format Full-Text
39793 45836 2014 9 PDF Available
Title
Investigations into the C4 olefin metathesis over Mo/Al2O3: Effects of support nature and pretreatment conditions on the product distribution
Abstract

•Two competitive olefin metathesis reactions occurred on Mo/Al2O3 catalyst.•Distribution of Mo species was closely related to the alumina calcination temperature.•The metathesis of 2-butene and 1-butene was more acidity-sensitive.•Suitable reductive treatment could selectively promote the formation of isopentene.

A series of Mo/Al2O3 catalysts were prepared and evaluated in the consecutive metathesis of 1-butene and isobutene. The correlations between the states of Mo species and Metathesis I (2-C4= + 1-C4= → C3= + 2-C5=), Metathesis II (2-C4= + i-C4= → C3= + i-C5=) were discussed in detail. It was found that Metathesis I and Metathesis II followed different deactivation rate due to the differences in active sites. Metathesis I was more acidity-sensitive and it was suppressed when alumina was calcined at high temperature due to the decrease of acid sites. Metathesis II kept relative good catalytic stability and high calcination temperature was beneficial to increase the ratio of isopentene in pentene fraction. As revealed by the XPS and reductive pretreatment results, different C4 olefin molecules on the same Mo-based catalyst exhibited different metathesis activity and partially reduced MoV (or MoIV) species from octahedrally coordinated Mo(O) species contributed to the selective promotion of Metathesis II.

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Keywords
Isopentene; Olefin metathesis; Molybdenum; Calcination temperature; Reductive treatment
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Investigations into the C4 olefin metathesis over Mo/Al2O3: Effects of support nature and pretreatment conditions on the product distribution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 472, 22 February 2014, Pages 92–100
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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