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. 2016 Jun 13;2(6):424–429. doi: 10.1021/acscentsci.6b00139

Figure 1.

Figure 1

CH4 oxidation over Cu-ZSM-5. Catalyst pretreatment: 5 h at 823 K under flowing O2, cooled to 483 K under O2 flow and then purged under He for 0.5 h. Initial dry CH4 oxidation: 0.5 h under 2400 mL h–1 gcat–1 of CH4 at 483 K. CH3OH partial pressure (kPa) with He/H2O/O2 over (blue open squares) Cu-Na-ZSM-5 (Cu/Al = 0.37, Na/Al = 0.26): T = 483 K, WHSV = 2400 mL h–1 gcat–1, PHe = 98.1 kPa, PH2O = 3.2 kPa, PO2 = 0.0025 kPa (25 ppm). CH3OH partial pressure (kPa) with CH4, H2O, and O2 over (■) Cu-Na-ZSM-5 and (red solid triangles) Cu-H-ZSM-5 (Cu/Al = 0.31): T = 483 K, WHSV = 2400 mL h–1 gcat–1, PCH4 = 98.1 kPa, PH2O = 3.2 kPa, PO2 = 0.0025 kPa (25 ppm).