Solvent‐Free Synthesis of ITQ‐12, ITQ‐13, and ITQ‐17 Zeolites

Abstract

Development of the sustainable routes for synthesis of ITQ‐family zeolites is very important because of their unique structures and excellent catalytic and adsorptive properties. The burden of costly raw materials and low efficiency of synthesis put a strong challenge for their widespread commercial application. Here, we show an alternative and simple route for synthesis of ITQ‐12, ITQ‐13, and ITQ‐17 zeolites using commercially available organic templates by a facile grinding process of anhydrous starting raw solids, followed by heating at 140—180 °C. Compared with the conventional hydrothermal synthesis, this approach has obvious advantages such as employment of low‐cost organic templates with very high effectiveness, high yield of zeolite products, short crystallization time, and relatively simple procedures. This methodology might open a pathway to synthesize ITQ zeolites with more sustainable manner.

Solvent-Free Synthesis of All Silica Beta Zeolite in the Presence of Tetraethylammonium Bromide

“…Due to be short of D4R cage in S-Beta zeolite sample, the detected D4R in the sample is most likely associated with the existence of the two adjacent layers at least stacked with the manner in polymorph C, which is in good agreement with the literature [15]. 29 Si and (c) 19 F MAS NMR spectra of as-synthesized S-Beta sample after water treatment.…”

“…Accordingly, the micropore surface area and micropore volume are estimated to be 510 m 2 /g and 0.23 cm 3 /g, respectively, which are the same as those of the corresponding Beta zeolite synthesized in the presence of the TEAOH under hydrothermal conditions [8]. Figure 5 shows 13 C, 19 F, and 29 Si MAS NMR spectra of as-synthesized S-Beta zeolite sample. Figure 5a gives the peaks at about 7 and 53 ppm, which are assigned to methyl and methylene in TEA + cation [21].…”

“…The N 2 sorption isotherms at the temperature of liquid nitrogen (77 K) were measured using a Micromeritics ASAP 2020 M and the Tristar system. The 29 Si, 13 C, and 19 F solid magic angle spinning nuclear magnetic resonance (MAS NMR) spectra were recorded on a Bruker AVANCE III 500 WB spectrometer. Thermogravimetric analysis (TG) was carried out with a NETZSCH STA 449C in air at a heating rate of 10 • C/min from room temperature to 800 • C. Figure 1 shows the XRD pattern of as-synthesized S-Beta zeolite sample in the presence of the TEABr under static conditions for 60 h at 140 • C, yielding a series of characteristic peaks associated with the *BEA structure (60% of polymorphs B and 40% of polymorphs A) [8].…”

“…The use of expensive organic templates increases the zeolite cost in the production [19,20]. Therefore, developing novel route to synthesize all silica Beta zeolite in the presence of cheap organic templates is strongly desirable.…”

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

“…As an important type of zeolites,g ermanosilicatebased zeolites provide many new structures,e xhibiting excellent performance in various catalytic reactions. [23][24][25][26][27][28][29][30][31][32][33][34] For example,BEC zeolite displays good catalytic performance in the isomerization of glucose to fructose; [24] ECNU-21 zeolite is an efficient shape selective catalyst for ethylene oxide hydration; [25] ITH zeolite shows excellent performance in the catalytic cracking and methanol-to-propylene (MTP) reaction. [26][27][28][29] ITH zeolite,f irstly discovered by Cormasg roup, [30] has aspecial framework structure (three dimensional 9 10 10membered ring channels;a perture size of 4.0 4.8, 4.8 5.1, and 4.8 5.3 ).…”