Issue 15, 2016
From the journal:

Catalysis Science & Technology

Octahedron-based gallium borates (Ga-PKU-1) with an open framework: acidity, catalytic dehydration and structure–activity relationship

Guangjia Wang,a   Weilu Wang,a   Fenhua Zhang,a   Wenliang Gao,*a   Rihong Conga  and  Tao Yang ORCID logo *a  

* Corresponding authors

a College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, People's Republic of China
E-mail: gaowl@cqu.edu.cn, taoyang@cqu.edu.cn

Abstract

An octahedron-based gallium borate (Ga-PKU-1) with an open framework was prepared by the boric acid flux method and studied by XRD, SEM, FT-IR, TGA-DSC, BET and NH3-TPD. The borate hydroxyl groups in the 18-ring membered channels functioned as Brönsted acid centers and were proved to play an important role in the dehydration of isopropanol to propylene with high selectivity. However, the other two gallium borates, Ga4B2O9 and GaBO3, with similar elemental compositions showed completely different acidities and catalytic performance for isopropanol decomposition. Our results indicated that such a great difference in selectivity most probably originated from the changes in the coordination microenvironment from GaO6 to GaO5. The relationship between the structure and activity was discussed in detail, and an intrinsic mechanism for the selectivity preference was proposed according to the obtained results.

Graphical abstract: Octahedron-based gallium borates (Ga-PKU-1) with an open framework: acidity, catalytic dehydration and structure–activity relationship

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Article information

DOI
https://doi.org/10.1039/C5CY02218E
Article type
Paper
Submitted
20 Dec 2015
Accepted
14 Apr 2016
First published
15 Apr 2016

Catal. Sci. Technol., 2016,6, 5992-6001

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Octahedron-based gallium borates (Ga-PKU-1) with an open framework: acidity, catalytic dehydration and structure–activity relationship

G. Wang, W. Wang, F. Zhang, W. Gao, R. Cong and T. Yang, Catal. Sci. Technol., 2016, 6, 5992 DOI: 10.1039/C5CY02218E

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