Fig. 4

XRD patterns of the samples. a XRD patterns of CuAlOx catalysts treated in different conditions: CuAlOx (curve a); CuAlOx + DIMCARB + CO2 + H2 (curve b); CuAlOx + Phen + CO2 (curve c); CuAlOx + Phen + Ar (curve d); CuAlOx + DIMCARB + Phen + CO2 + H2 (curve e); CuAlOx + Phen + CO2 + H2 (curve f); and CuAlOx + Phen + H2 (curve g). b Time-resolved XRD patterns of CuAlOx catalysts treated with 1,10-Phen and H2 at different times: 0, 4, 8, 12, 16, 20, and 24 h