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. 2022 Dec 2;123(9):6359–6411. doi: 10.1021/acs.chemrev.2c00439

Figure 32.

Figure 32

Resonance Raman (rR) spectra of O2-activated Cu-ZSM-5. (A) rR spectra of O2-activated Cu-ZSM-5 (Cu/Al = 0.54) collected at eight λexs from 351 to 568 nm with corresponding absorption spectrum inset. (B) rR spectra (λex = 457.9 nm) of O2-activated Cu-ZSM-5 with varying Cu/Al ratios from 0.10 to 0.54 with corresponding absorption spectra inset. (C) rR spectra (λex = 457.9 nm) of Cu-ZSM-5 (Cu/Al = 0.54) pretreated in O2 at 450 °C, recorded before and after heating in He at 723 K and after reaction with CH4 at 473 K. (D) rR spectra (λex = 457.9 nm) of Cu-ZSM-5 activated by 16O2 (red) and 18O2 (blue). Reproduced with permission from ref (361). Copyright 2009 PNAS.