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. Author manuscript; available in PMC: 2013 Mar 11.
Published in final edited form as: J Catal. 2011 Nov 14;284(2):157–164. doi: 10.1016/j.jcat.2011.10.009

Figure 4.

Figure 4

rR spectra (λex=457,9nm) of Cu-ZSM-5 after calcination in 16O2 (red) and 18O2 (blue) [58]. Reproduced with permission from ref.[58], © 2009 the National Academy of Sciences of the United States of America.