摘要
以二异丙胺为模板剂,在乙醇-水体系中合成了纤维状结构的ZrAPO-11分子筛。利用XRD、SEM、N2物理吸附BET和吡啶吸附FTIR等技术对所合成的产物进行了表征。表征结果显示,增大醇水比,ZrAPO-11分子筛的形貌从棒状转变为纤维状;Zr离子的引入有助于分子筛的结晶并改善晶体的形貌;利用HF的配合作用,ZrAPO-11分子筛的形貌也从块状转变为片状,最终转变为纤维状;在醇水体系中HF作用下,ZrAPO-11分子筛的结晶速率明显减缓;所合成的ZrAPO-11分子筛为长度约15μm、宽度50 nm、厚度约10 nm的纳米纤维,比表面积高达397.4 m2/g,并具有较多的B酸中心。
ZrAPO-11 molecular sieves with fiber structure were synthesized with diisopropylamine as template in an ethanol-water system. The products were characterized by means of XRD, SEM, N2 physical adsorption BET and pyridine adsorbed FFIR. The morphologies of the ZrAPO-11 molecular sieves were transformed from rod shape to fiber shape by increasing the ratio of ethanol to water. The crystallinity and morphology of the ZrAPO-11 molecular sieves were improved by introducing zirconium ions. The morphologies of the ZrAPO-11 molecular sieves were also transformed from clump shape and then plate shape to fiber shape by addition of HF. In the ethanol-water system, the addition of HF resulted in reduction of the crystallization rate of the ZrAPO-11 molecular sieves. The product with 397.4 m2/g BET surface area and the fiber structure of 15 p,m length, 50 nm width and 10 nm thickness were prepared. The prepared ZrAPO-11 molecular sieves had many Bronsted acid sites.
出处
《石油化工》
CAS
CSCD
北大核心
2011年第10期1046-1051,共6页
Petrochemical Technology
基金
陕西省教育厅项目(11JK0603)
宝鸡文理学院院级项目(ZK08117)
