钡改性的Ni/γ- Al2O3催化剂用于甲烷部分氧化的研究

Na2CO3-NaOH was used as precipitator to prepare Ba modified Ni/γ- Al2O3 catalysts with co-deposition method. XRD and BET showed that the catalyst prepared by this method had better dispersion of the active components and strong interaction between the active component and the support. Compared with Ni/γ- Al2O3 catalysts, the addition of Ba enhanced the activity and the stability of the catalysts for partial oxidation of methane. The CH4 conversion was close to 100% and H2 selectivity reached 98.1% over Ba modified Ni/γ- Al2O3 catalysts under the condition of space velocity=80 000 h－1 and CH4/O2/N2=14/7/79 at 800 ℃. The addition of Ba did not change the BET area of the catalysts, but inhibited the formation of granular NiAl2O4, which favored the existence of activity component, and improved the stability of the support so as to improve the catalyst performance. After 15 h stability test at 800 ℃, the methane conversion was kept about 95%. The test results show that Ba modified Ni/γ- Al2O3 catalyst has higher activity for partial oxidation of methane.