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(A) is CH4 conversion over H–Pd/CeO2-600(t). (B) is stability test of H–Pd@CeO2-1000(12), H–Pd@CeO2-1000(24), H–Pd@CeO2-600(24), and I–Pd/CeO2-1000. (C,D) are CH4 conversion over the catalysts synthesized by different methods under dry feed condition and wet feed condition (15% extra water), respectively. Dry feed: 2 vol % CH4, 4 vol % O2, and 20 vol % CO2 in N2 as balance gas; GHSV of 100 000 mL h–1 g–1.
