摘要
研究了Ni/Al_2O_3,Pt/Al_2O_3和一系列Pt-Ni/Al_2O_3催化剂对甲烷部分氧化制合成气的催化作用,发现Pt-Ni/Al_2O_3催化剂显示了比Ni/Al_2O_3和Pt/Al_2O_3更高的活性和稳定性.H_2-TPR,CO-TPD,CO_2-TPD,SEM,XPS和XRD等结果证明:Pt和Ni之间存在较强的相互作用,Pt和部分Ni形成固溶体合金并且Pt在催化剂表面富集.Pt和Ni之间的相互作用提高了催化剂的活性和稳定性,甲烷在Pt-Ni/Al_2O_3上的催化部分氧化具有不同于在Pt/Al_2O_3和Ni/Al_2O_3上的反应性能.
The catalytic partial oxidation of methane to syngas over Ni/Al2O3, Pt/Al2O3 and a series of Pt - Ni/Al2O3 catalysts was investigated. It was found that Pt - Ni/Al2O3 catalysts exhibit higher activity and stability than Ni/Al2O3 and Pt/Al2O3. TPR and TPD methods were used to characterize Pt - Ni bimetallic interactions in the catalysts. A series of Pt - Ni/Al2O3 catalysts and unsupported Pt - Ni samples were studied by XRD and XPS. It was found the formation of R - Ni alloy in the Pt - Ni/Al2O3 catalysts and the enrichment of platinum on the surface of the catalysts. It is concluded that the higher activity and stability of ft - Ni/Al2O3 catalysts were caused by R - Ni bimetallic interactions.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1998年第10期1021-1026,共6页
Acta Chimica Sinica
基金
国家自然科学基金(29573128)资助课题
关键词
甲烷
合成气
部分氧化
催化剂
铂
镍
methane, syngas, partial oxidation, Pt- Ni/Al2O3 catalyst, Pt- Ni bimetallic interaction
