摘要
用实验方法考察了磷改性对γ-Al_2O_3的物理和化学性能的影响,研究表明,磷酸盐与γ-Al_2O_3的反应容量有限,且存在着一个平衡点,磷改性在一定程度上能降低γ-Al_2O_3的表面积和孔体积,并同时能改变γ-Al_2O_3的表面酸性,使γ-Al_2O_3表面酸强度减弱。
The chemical and physical properties of γ-Al_2O_3 modi fied by phosphate wereinvestigated,The results show that γ-Al_2O_3 modified by the phosphate solution withappropriate concentration can reduce the surface area and the pore volume of γ-Al_2O_3 to someextent.The acidity was measured by using NH_3-TPD technology,It shows that the addition ofphosphate can accomodate acid strengh distribution on the surface of γ-Al_2O_3 and convert thestrong acid sites into the medium and weak acid sites.
出处
《石油大学学报(自然科学版)》
CSCD
1995年第6期84-87,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
磷
改性
性能
三氧化二铝
裂化催化剂
催化剂
Phosphate
Modification
γ-Al_2O_3 Chemical properties
Physicalpropertles