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. 2016 Jul 1;11:321. doi: 10.1186/s11671-016-1529-z

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Influences of reaction conditions on the cycloaddition of CO₂ and ECH over DVB-HTA. a Influence of initial CO₂ pressure. b Influence of reaction time. c Influence of reaction temperature. d Influence of catalyst amount. Reaction conditions: catalyst 0.05 g, ECH 16 mmol, CO₂ pressure 1.2 MPa, 120 °C, 3 h; for each figure, there is a specific parameter changed