| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 40154 | Applied Catalysis A: General | 2014 | 9 Pages |
•Stepwise sulfidation methods were used on MoO3/CeO2–Al2O3 catalyst.•Stepwise sulfidation processes enhanced the methanation activity and stability.•Stepwise sulfidation decreased the damage to the textural structure of the catalyst.•Stepwise sulfidation decreased the damage to the CeO2 particles in the catalyst.•Stepwise sulfidation affected the CeO2 in the catalysts rather than the MoO3.
The effect of stepwise sulfidation on a MoO3/CeO2–Al2O3 catalyst for sulfur-resistant methanation was studied. The prepared catalysts were characterized using N2-physisorption (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), and temperature-programmed sulfidation (TPS). The methanation activities and stability of the one-step-sulfided MoO3/CeO2–Al2O3 catalysts were enhanced by stepwise sulfidation processes. The XRD, TEM, RS, and XPS results indicated that the enhancement in the stability of MoO3/CeO2–Al2O3 was caused by the reduction and sulfidation of the CeO2 particles, eliminating unstable CeO2 and driving the migration of Ce3+ and Al3+ ions. The catalyst subjected to stepwise sulfidation exhibited improved methanation activity because the stepwise sulfidation reduced the degree of CeO2 sulfidation and mitigated textural structure damage to the catalyst. Finally, a sulfidation mechanism for CeO2 and MoO3 was proposed.
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