摘要
采用正丙基三乙氧基硅烷(Pr-TES)对SAPO-11分子筛晶种进行有机硅烷化,于环己烷-正丁醇体系合成出小粒径SAPO-11分子筛(H-SAPO-11-S)。采用X射线衍射、扫描电子显微镜、N2吸附-脱附、吡啶吸附红外光谱等表征方法研究H-SAPO-11-S的物化性质,并与常规法合成的H-SAPO-11-N进行对比,结果表明:Pr-TES晶种硅烷化可以合成出纯相的SAPO-11分子筛,平均粒径由常规法合成的8.0μm减小到1.0μm;与H-SAPO-11-N相比,H-SAPO-11-S具有更高的外比表面积、孔体积与中强B酸含量。进一步评价了催化剂对正十六烷临氢异构化反应的催化活性,结果表明,与Pt?H-SAPO-11-N相比,Pt?H-SAPO-11-S具有更高的异构化活性与异构体选择性。
The SAPO-11 seed crystal was first silylanized using n-propyltriethoxysilane （Pr-TES） in synthesis process and the SAPO-11 molecular sieve with small particle size （H-SAPO 11-S） was then synthesized by crystallization in cyclohexane-l-butanol system. Samples were analyzed by XRD, SEM, ni- trogen adsorption-desorption and Py-IR. Characterization results show that pure phase SAPO 11 molec- ular sieve is obtained by silylanizing seed crystal. The mean particle size for H SAPO-11 S molecular sieve is much smaller than normal SAPO-tl molecular sieve （H-SAPO-11-N） synthesized by conven- tional method, reducing from 8.0 p.m of H-SAPO ll-N to 1.0 gm of H-SAPO-11-S. Compared with H- SAPO-11-N molecular sieve,H-SAPO-11-S molecular sieve possesses much more external specific sur- face area, larger pore volume and more suitable acid amount and acid strength. The results of n-hexade- cane hydroisomerization show that the catalyst Pt/H-SAPO-11-S exhibits much better activity and high- er isomers selectivity than that of the Pt/H SAPO-11-N catalyst.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2014年第1期28-34,共7页
Petroleum Processing and Petrochemicals
