CAJ | 학술논문

以稀土金属Nd, Ce或La的氧化物为助剂,采用β-环糊精浸渍法对Ni/SBA-15催化剂进行了改性,并运用X射线衍射、N2吸附-脱附、程序升温还原和热重等手段考察了改性的催化剂在CO2重整CH4制合成气反应中的催化性能。结果表明, Nd等稀土金属氧化物的添加对催化剂孔结构和晶相结构等性质影响不大,但可影响NiO的还原； Nd的添加使NiO与载体之间以Ni-Nd-O形式相互作用,促进了活性组分NiO的还原。其中, Nd的添加量为5-10 wt%时所制备的催化剂在重整反应中的催化活性最高,且具有很强的抗积碳性能。 La和Ce氧化物促进的Ni催化剂也表现出类似的性质和催化性能。
이희토금속Nd, Ce혹La적양화물위조제,채용β-배호정침지법대Ni/SBA-15최화제진행료개성,병운용X사선연사、N2흡부-탈부、정서승온환원화열중등수단고찰료개성적최화제재CO2중정CH4제합성기반응중적최화성능。결과표명, Nd등희토금속양화물적첨가대최화제공결구화정상결구등성질영향불대,단가영향NiO적환원； Nd적첨가사NiO여재체지간이Ni-Nd-O형식상호작용,촉진료활성조분NiO적환원。기중, Nd적첨가량위5-10 wt%시소제비적최화제재중정반응중적최화활성최고,차구유흔강적항적탄성능。 La화Ce양화물촉진적Ni최화제야표현출유사적성질화최화성능。
Rare-earth metal (Nd, Ce, and La) oxides modified Ni/SBA-15 catalysts were prepared by aβ-cyclodextrin-modified impregnation method. The physicochemical properties of the catalysts were characterized using X-ray diffraction, N2 adsorption-desorption, temperature-programmed reduction, and thermogravimetric analysis. The catalytic performance of the catalysts was evaluat-ed in the CO2 reforming of CH4 to syngas. The characterization results showed that Nd, Ce, and La modification had little effect on the textural structures and crystalline phases of the obtained cata-lysts but influenced the reduction of NiO species. Addition of Nd favored interactions between Ni and SiO2, possibly as a result of the formation of Ni-Nd-O species. The results for the CO2 reforming of CH4 revealed that the addition of suitable amounts of Nd (5-10 wt%) improved the catalytic ac-tivity and stability. A small amount of carbon was deposited over the used Nd-modified catalysts. The properties of Ni/SBA-15 catalysts modified with La and Ce were similar to those of the Nd-modified catalysts.