Nature Communications 5: Article number: 5723 (2014); Published: 4 December 2014; Updated: 5 February 2015

The financial support for this Article was not fully acknowledged. The Acknowledgements should have read:

This work was supported as part of the Methane Opportunities for Vehicular Energy (MOVE) Program under the Award Number DE-AR0000249 and as part of the Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center (EFRC) funded by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001015. M.A.O. acknowledges the partial support of his group's contribution and time by the Robert A. Welch Foundation (Grant B-1542) and the U.S. National Science Foundation (CHE-1413641).