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a) Stability evaluation of Cu–Ni x O y /SiO2 catalysts for DMO hydrogenation; b) TG/DTG curves of Cu–Ni x O y /SiO2 catalysts after the stability test. Reaction conditions: 2.6 MPa of H2; 185 °C; H2/DMO of 60/1; DMO LHSV of 0.8 h–1, based on 15 wt % DMO methanol solution.
