摘要
AlPO_(4-n)和SAPO_(-n)系列分子筛是80年代由美国联合碳化物公司(U.C.C.)首先合成的一类磷铝分子筛。杂原子Fe的引入可调变其性能,使其出现独特的吸附及催化性能。Castner等用量子力学方法分析了玻璃中Fe^(3+)的顺磁信号,g=4.30的物理意义。Mcnicol,Pott等研究了Fe^(3+)取代的NaY和NH_4Y骨架中Al的ESR谱。我们用ESR方法研究了本实验室合成出的FeAPO_(-5)和FeSAPO_(-5)分子筛。结果表明,
FeAPO-5 and FeSAPO-5were sythesized by hydrothermal method. The above samples have been studied by means of ESR and confirmed that Fe3+ is inserted the framework. The relationship between the gobs value and the surroundings of Fe + in the FeAPO-5and FeSAPO-5are discussed. It is also proposed that there are a number of possible forms for Fe3+ in the FeAPO-5and FeSAPO-5,(1) a strong sharp ESR signal at g=4.20,as tetrahedral
coordination Fe3+ in the framework of FeAPO-5,and FeSAPO -5;(2)a very weak broad ESR signal at g≈2.00,as amorphous Fe2O3 ;(3) a very weak ESR signal at g≈8.00, as distorted
octahadral Fe3+ species.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1989年第3期117-119,共3页
Chinese Journal of Inorganic Chemistry
