《Table 4.Surface elemental composition of Ce and Zr in different catalysts deter-mined by XPS.》

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《Sulfur-resistant methanation over MoO_3/CeO_2–ZrO_2 catalyst: Influence of Ce-addition methods》

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Fig.2（b）shows the Raman spectra of the catalysts after sulfidation.The bands at 181 cm-1and 460 cm-1were attributed to Zr O2and CeO2，respectively.In addition，the bands appearing at 381 and 405 cm-1are ascribed to MoS2[33，34]，while a weak band attributed to defect oxygen（600 cm-1）was found.The concentration of Mo S2and defect oxygen were reflected by（I2+I3）/I1，I5/I1（I1，I2，I3and I5is the peak intensity of the bands at 181 cm-1，381 cm-1，405 cm-1and600 cm-1），which is shown in Table 3.The highest values of（I2+I3）/I1and I5/I1were obtained for 10Mo/CeZr-DP catalyst after sulfidation，which presented the optimum sulfur-resistant methanation activity.So the amounts of MoS2and defect oxygen are considered main factors affecting on the methanation activity.