摘要
选用SAPO-11,USY,ZSP-3三种分子筛为载体,浸渍镍制备催化剂;采用BET、XRD、程序升温氨脱附(NH3-TPD)以及吡啶吸附-脱附红外光谱法对催化剂进行表征。以正辛烷为模型化合物,在临氢的条件下,考察催化剂的异构化及芳构化性能。结果表明:Ni/SAPO-11具有最好的异构化选择性和较好的芳构化选择性,但转化率最低;Ni/ZSP-3虽然具有最高的转化率和芳构化选择性,但其异构化选择性最低;Ni/USY的选择性和转化率均介于Ni/SAPO-11和Ni/ZSP-3之间,但芳构化选择性最差。稀土改性可以调节ZSP-3分子筛为载体的催化剂表面酸中心分布,提高异构化和芳构化选择性。
Nickel supported catalysts were prepared by impregnating nickel on SAPO-11, USY and ZSP-3 molecular sieves. BET, XRD, NH3-TPR and pyridine adsorption-desorption FT-IR were used to characterize the prepared catalysts. The hydroisomerization and hydroaromatization performance of these catalysts were evaluated with a micro-reactor using n-octane as model compound. Test results indicated that among the three catalysts, Ni/SAPO-11 showed the highest isomerization selectivity and good aromatization selectivity, but its conversion was the lowest; Ni/ZSP-3 showed the highest conversion and aromatization selectivity, yet its isomerization selectivity was the lowest; Ni/USY showed mod- erate isomerization selectivity and conversion, however, its aromatization selectivity was poor. Using ZSP-3 molecular sieve modified by rare earth cations as support, the surface acid center distributions of cat- alyst were altered, resulting in an enhancement of catalyst selectivity to isomerization and aromatization.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2012年第7期12-15,共4页
Petroleum Processing and Petrochemicals
关键词
正辛烷
临氢异构化
临氢芳构化
分子筛
酸性
n-octane
hydroisomerization
hydroaromatization
molecular sieve, acidity
