TiO2 nanofibers of different crystal phases for transesterification of alcohols with dimethyl carbonate
Zhang, Xingguang, Ke, Xuebin, Zheng, Zhanfeng, Liu, Hongwei, & Zhu, Huaiyong (2014) TiO2 nanofibers of different crystal phases for transesterification of alcohols with dimethyl carbonate. Applied Catalysis B : Environmental, 150-151, pp. 330-337.
TiO2 nanofibers with different crystal phases have been discovered to be efficient catalysts for the transesterification of alcohols with dimethyl carbonate to produce corresponding methyl carbonates. Advantages of this catalytic system include excellent selectivity (>99%), general suitability to alcohols, reusability and ease of preparation and separation of fibrous catalysts. Activities of TiO2 catalysts were found to correlate with their crystal phases which results in different absorption abilities and activation energies on the catalyst surfaces. The kinetic isotope effect (KIE) investigation identified the rate-determining step, and the isotope labeling of oxygen-18 of benzyl alcohol clearly demonstrated the reaction pathway. Finally, the transesterification mechanism of alcohols with dimethyl carbonate catalyzed by TiO2 nanofibers was proposed, in which the alcohol released the proton to form benzyl alcoholic anion, and subsequently the anion attacks the carbonyl carbon of dimethyl carbonate to produce the target product of benzyl methyl carbonate.
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|Item Type:||Journal Article|
|Keywords:||TiO2 nanofibers, transesterification, apparent activation energy, isotope labeling|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Catalytic Process Engineering (090402)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Environmental Nanotechnology (100701)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||© 2013 Elsevier B.V. All rights reserved.|
|Copyright Statement:||NOTICE: this is the author’s version of a work that was accepted for publication in Applied Catalysis B : Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis B : Environmental, [150-151, ISSUE#, (5 May 2014)] http://dx.doi.org/10.1016/j.apcatb.2013.12.035|
|Deposited On:||13 Jan 2014 23:35|
|Last Modified:||20 Sep 2016 18:28|
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