摘要
采用 TG- DTA、FT- IR、XRD、BET比表面积等方法 ,研究了体相及 Si O2 负载磷钼杂多酸铜盐的性质 ,并与磷钼酸作了对比 .结果表明 ,磷钼酸铜盐的热稳定性稍高于磷钼酸 ,且铜盐的部分结晶水更稳定 ;但是它们的最后分解产物相同 . Si O2 负载的磷钼酸铜盐以非晶形态高度分散在 Si O2 表面 ,但它们确实保持了 Keggin结构 ,热稳定性也提高约 45℃ .
Characteristics of bulk and silica supported copper salt of 12\|phosphomolybdic acid (CuPMo) were investigated using TG\|DTA, FT\|IR, XRD, and BET surface area measurement techniques and compared with the results obtained with 12\| phosphomolybdic acid (HPMo). It is observed that the presence of Cu as counter\|cations in HPMo increased the thermal stability and the temperature of partial dehydration of crystallization water. Moreover no copper oxides were detected by XRD in the completely decomposed products of CuPMo. The results also indicate that CuPMo was highly dispersed on the support surface in an amorphous form, but Keggin units did exist on silica surface even up to 425 ℃, i.e.~45 ℃ higher than that of bulk CuPMo.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2000年第5期359-362,共4页
Journal of Molecular Catalysis(China)
