摘要
采用 FT- IR、 XRD、 BET、 TPR等方法 ,研究了 Si O2 负载硅钼杂多酸的热稳定性和还原性 ,结果表明 ,虽然 Si Mo的负载量达到 2个理论单层 ,但仍以非晶形态高度分散在 Si O2 上 ;负载的硅钼酸稳定性提高 ,热分解温度在 35 0～ 6 0 0℃ ;同时 ,可还原性能降低 .杂多酸的热稳定性和 TPR性能相关 .
The thermostability and reducibility of silica supported 12 molybdosilicic acid were investigated using FT IR, XRD, BET and TPR techniques and compared with that of bulk acid. The results demonstrated that 12 molybdosilicic acid is highly dispersed on silica amorphously even when SiMo content reaches two theoretical monolayers, with its Keggin units existing up to ~600 ℃, while the reducibility of silica supported samples tends to decrease. Relationship between the thermostability and reducibility was discussed as well.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2000年第4期281-284,共4页
Journal of Molecular Catalysis(China)
关键词
杂多酸
硅钼酸
热稳定性
二氧化硅
催化剂
Heteropolyacid
Heterogenization
12 Molybdosilicic acid
Thermostability
