Synthesis of Ferrierite-Type Zeolite in the Presence of a Catalytic Amount of Pyrrolidine and Sodium Bis(2-ethyhlhexyl) Sulfosuccinate

Promoting Role of Catalytic Amount of Glycerol in Crystallization of THF-FER Zeolite

“…In fact, the crystallization of pure THF-Glyc-FER zeolite was performed successfully at 413 K for 192 h in the reactant system as well (see Figure 3f). As known, the reaction temperature of 413 K was even the lowest for the synthesis of FER zeolite reported, 18,19 which further evidences that the catalytic amount of Glyc obviously promotes the crystallization process, and lowers the reaction temperature as well. …”

“…The BET and Langmuir surface areas, determined from the isotherms with BJH method were 331.5 and 418.2 m 2 •g -1 , respectively, which were slightly more than 325.0 and 410.0 m 2 •g -1 of the latter sample (see Table 1), indicating the excellent adsorption property of the former H-FER zeolite, the adsorption values of which were very close to those of the all-silica FER single crystals 16 and obviously higher than those of FER zeolite synthesized in the presence of surfactant. 18,19 On the other hand, the former zeolite sample possessed more external surface area, total and macro pore volume, and average pore size, which were beneficial to the diffusion of the adsorptive molecules as well. The fact illustrates that the zeolite crystals synthesized from the reactant with Glyc had more intercrystalline pores in mesoporous or macroporous size, due to the close-packed intergrowth of crystallites with each other, in agreement with the observation by SEM (see Figure 6a).…”

“…The fact illustrates that the zeolite crystals synthesized from the reactant with Glyc had more intercrystalline pores in mesoporous or macroporous size, due to the close-packed intergrowth of crystallites with each other, in agreement with the observation by SEM (see Figure 6a). Mechanism of Glyc role Kulkarni and coworkers 18 have synthesized high-silica FER zeolite in the presence of anionic surfactant, and the function mechanism of the surfactant was studied, which was found to orient the pyrrolidine in a particular fashion by polarpolar and nonpolar-nonpolar interactions to increase the interaction between template molecules and silicate and/or aluminum species. The size of Glyc molecule is not very large, but it belongs to a very high viscosity solvent and possesses the similar properties with surfactant due to the high contents of hydroxyl groups, which may keep the reactant system with homogeneous temperature and alkalinity everywhere in autoclave during synthesis process.…”

“…17 The pure-phase FER zeolite has also been synthesized hydrothermally with pyrrolidine as the template in the presence of small amount of anionic surfactant, sodium bis(2-ethyhlhexyl) sulfosuccinate and/or nonionic surfactant, Tween 20 or Tween 80, respectively. 18,19 The catalytic amount of surfactants have been found to have a significant effect on the zeolite crystal size and morphology, increase the Si/Al ratio, the crystallinity and the yield of the product, and reduce the amount of template used in the synthesis. 18,19 In this paper, we report the synthesis of THF-FER zeolite in the reactant system of THF-Na 2 O-SiO 2 -Al 2 O 3 -H 2 O with various catalytic amount of Glyc.…”

“…18,19 The catalytic amount of surfactants have been found to have a significant effect on the zeolite crystal size and morphology, increase the Si/Al ratio, the crystallinity and the yield of the product, and reduce the amount of template used in the synthesis. 18,19 In this paper, we report the synthesis of THF-FER zeolite in the reactant system of THF-Na 2 O-SiO 2 -Al 2 O 3 -H 2 O with various catalytic amount of Glyc. Proper amount of Glyc could effectively promote the crystallization process of THF-FER zeolite, resulting in lowering the reaction temperature and shortening the period of the zeolite crystallization as well as effectively restraining cocrystallization of MOR zeolite as an impure phase especially at low reaction temperature, and possess a significant effect on the morphology and the size of the crystals.…”