Materials
Sodium metaaluminate (> 98.5% purity), cetyltrimethyl
ammonium bromide (CTAB, > 99.0 % purity) and
binder-containing zeolite X-I were purchased from Aladdin Industrial
Co., Ltd (Shanghai, China). Sodium hydroxide (> 96.0%
purity), ammonium chloride (> 99.5% purity) and
binder-containing zeolite X-II were provided by Sinopharm Chemical
Reagent Co., Ltd (Shanghai, China). Silica sol (solid content of 40
wt%) with average particle size of 20 nm, was obtained from Qingdao
Fuso Refining & Processing Co., Ltd (Qingdao, China). n -Heptane
(> 99.0 % purity), binder-containing zeolite X-III and all
nitrates (> 99.0 % purity) were supplied by Shanghai Titan
Scientific Co., Ltd (Shanghai, China). Binder-containing zeolite X-IV
was acquired from Nankai University Catalysts Co., Ltd (Tianjing,
China). 1-Hexene (> 99.0% purity) was provided by Huawei
Ruike Chemical Industry Co., Ltd (Beijing, China). Deionized water was
applied in all synthesis experiments. All chemicals were used without
further purification.