石油化工2016，Vol.45Issue(7)：812-818,7.DOI:10.3969/j.issn.1000-8144.2016.07.007
骨架硅铝比对改性H-ZSM-5沸石孔结构及硅铝脱除行为的影响
Effects of framework silica-alumina ratio on pore structure and Si (Al)-atom removal of modified H-ZSM-5 zeolites
摘要
Abstract
H-ZSM-5 zeolites with different silica-alumina ratio were synthesized from silica sol and sodium aluminate,and then were modified through a combined alkali-acid treatment. The effects of the initial silica-alumina ratio of the H-ZSM-5 zeolites on the pore structure of the modified zeolites and their behavior in desilication and dealuminization were investigated by means of XRD,N2 adsorption,FTIR,SEM and TEM. The results indicated that,the synthesized samples possessed the characteristic diffraction peaks of the H-ZSM-5 zeolites,and the alkali-acid treatment promoted the removal of amorphous aluminium and silicon and improve the additional mesoporosity. With the increase of the initial silica-alumina ratio,the mesoporous area and volume of the modified zeolites increased,and their microporous area and volume firstly decreased and then increased. The increase in the initial silica-alumina ratio led to an increased desilication selectivity but a decreased dealuminization selectivity. In the alkali-acid treatment,the selectivity of the H-ZSM-5 zeolites to the desilication was much larger than that to the dealuminization. Partial amorphous aluminium and silicon on the crystal surface disappeared and textured cracks appeared. And the number of the surface defects increased with the increase of the initial silica-alumina ratio.关键词
H-ZSM-5沸石/孔结构/骨架硅铝比/脱硅/脱铝Key words
H-ZSM-5 zeolites/pore structure/framework silica-alumina ratio/desilication/dealuminization分类
化学化工引用本文复制引用
王超,韩静宇,王洪涛,张莉,封瑞江,金英杰..骨架硅铝比对改性H-ZSM-5沸石孔结构及硅铝脱除行为的影响[J].石油化工,2016,45(7):812-818,7.基金项目
国家自然科学基金项目（21171083）。 （）
