Microporous Cokes Formed in Zeolite Catalysts Enable Efficient Solar Evaporation

Abstract
Cokes are inevitably generated during zeolite-catalyzed reactions as deleterious side products that deactivate the catalyst. In this study, we in-situ converted cokes into carbons within the confined microporous zeolite structures and evaluated their performances as absorbing materials for solar-driven water evaporation. With a properly chosen zeolite, the cokederived carbons possessed ordered interconnected pores and tunable compositions. We found that the porous structure and the oxygen content in as-prepared carbons had important influences on their energy conversion efficiencies. Among various investigated carbon materials, the carbon derived from the methanol-to-olefins reaction over zeolite Beta gave the highest conversion efficiency of 72% under simulated sunlight with equivalent solar intensity of 2 suns. This study not only demonstrates the great potential of traditionally useless cokes for solar thermal applications but also provides new insights into the design of carbon-based absorbing materials for efficient solar evaporation.

Citation
Wang J, Liu Z, Dong X, Hsiung C-E, Zhu Y, et al. (2017) Microporous Cokes Formed in Zeolite Catalysts Enable Efficient Solar Evaporation. J Mater Chem A. Available: http://dx.doi.org/10.1039/c7ta00882a.

Acknowledgements
This work is supported by the CCF grants from Advanced Membranes and Porous Materials Center (AMPMC) and KAUST Solar Center (KSC) at King Abdullah University of Science and Technology. Yu Han thanks the Key international science and technology cooperation project of Hainan province (kjhz2014-08) for supporting a meeting for initial discussions.

Publisher
Royal Society of Chemistry (RSC)

Journal
Journal of Materials Chemistry A

DOI
10.1039/c7ta00882a

Additional Links
http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA00882A#!divAbstract

Permanent link to this record