Nature Materials 16, 132–138 (2017); published online 26 September 2016; corrected after print 24 March 2017 and 25 October 2017

In the version of this Article originally published, the four instances of the window type on page 136 should have read '10-MR'. On the same page, in the 'Catalytic activity' section, the accessibility of isobutene was incorrectly described, and the phrase should have read 'isobutene is mainly accessible to Pt species located at the external cups on the surface of MCM-22'. These changes do not affect the results of the Article.