fig14

Figure 14. The formation of coke species with molecular masses (A) less than 200 Da and (B) greater than 200 Da under various conditions. (C) Operando UV-Raman spectra of a coked ZEOS specimen during steam treatment. (D) Micropore volume and coke mass of a ZEOS specimen over time during steam treatment. Reproduced with permission from ref. 146^[146]. Copyright 2021, Nature Publishing Group.