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Issue 5, 2014
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Basicities and transesterification activities of Zn–Al hydrotalcites-derived solid bases

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Abstract

Solid bases were prepared by calcining as-prepared Zn–Al hydrotalcites at different temperatures. The evolutions of their structure and basicity were characterised using X-ray diffraction, thermogravimetric analysis, infrared spectroscopy of CO2 adsorption and temperature programmed desorption of methanol. With an increase in the calcination temperature, the as-prepared Zn–Al hydrotalcites were firstly converted into dehydrated Zn–Al hydrotalcites and next converted into Zn–Al oxides. The basic sites of these solid bases changed from OH groups to Mn+–O2− (M = Zn or Al) pairs and isolated O2− ions. These solid bases were evaluated in transesterification reactions used for biodiesel production. The dehydrated Zn–Al hydrotalcites obtained at 473 K exhibit the highest activity, with a biodiesel yield of approximately 76% at 413 K, 1.7 MPa and 1.0 h−1. This catalyst exhibits no deactivation after about 150 h. The structure–reactivity relationship of the catalyst is also discussed.

Graphical abstract: Basicities and transesterification activities of Zn–Al hydrotalcites-derived solid bases

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Article information


Submitted
31 Dec 2013
Accepted
04 Feb 2014
First published
04 Feb 2014

Green Chem., 2014,16, 2604-2613
Article type
Paper
Author version available

Basicities and transesterification activities of Zn–Al hydrotalcites-derived solid bases

Q. Liu, B. Wang, C. Wang, Z. Tian, W. Qu, H. Ma and R. Xu, Green Chem., 2014, 16, 2604
DOI: 10.1039/C3GC42648C

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