CAJ | 학술논문

　　以不同的HY沸石分子筛为基质，采用等体积浸渍法将镧离子引入HY分子筛中，得到低钠含量LaHY分子筛，并采用X射线荧光（XRF）、X射线衍射（XRD）、比表面积（BET）、氨程序升温脱附（NH3-TPD）等方法对催化剂进行表征，考察了催化剂对正己烷的催化裂解性能。结果表明，LaHY分子筛中钠含量越低，其相对结晶度和晶胞参数越小，而总酸量和比表面积越大，催化活性及烯烃选择性也越高。当HY焙烧温度为550℃时，经La改性后得到的LaHY分子筛，其相对结晶度、总酸量和比表面积最大，催化活性最高，但温度升高至600℃时，LaHY分子筛的物化性质和催化性能都降低。
　　이불동적HY비석분자사위기질，채용등체적침지법장란리자인입HY분자사중，득도저납함량LaHY분자사，병채용X사선형광（XRF）、X사선연사（XRD）、비표면적（BET）、안정서승온탈부（NH3-TPD）등방법대최화제진행표정，고찰료최화제대정기완적최화렬해성능。결과표명，LaHY분자사중납함량월저，기상대결정도화정포삼수월소，이총산량화비표면적월대，최화활성급희경선택성야월고。당HY배소온도위550℃시，경La개성후득도적LaHY분자사，기상대결정도、총산량화비표면적최대，최화활성최고，단온도승고지600℃시，LaHY분자사적물화성질화최화성능도강저。
The catalysts of La supported on different HY zeolites was prepared by isovolume impreg-nation method .The catalysts were characterized by X-ray fluorescence ( XRF ) , X-ray diffraction ( XRD) , BET surface area measurements , and NH3-temperature programmed desorption , and eval-uated for the catalytic cracking of n-hexane .The results show that the lower Na content , the lower crystallinity and cell parameters of LaHY zeolite obtained , while with the increase in the total acid amount and specific surface areas , the catalytic activity and the selectivity of LaHY zeolite to olefin increased.The LaHY zeolite has higher crystallinity , total acid amount ,specific surface areas and the catalytic activity at higher temperature .When the temperature was higher than 550℃, the phys-ichemical and catalytic performance of LaHY zeolite were decreased .