Ultrathin nanosheets of aluminosilicate FER zeolites synthesized in the presence of a sole small organic ammonium

Abstract

Ultrathin nanosheets (6–8 nm) of aluminosilicate FER zeolites have been successfully synthesized using a sole small organic ammonium (N,N-diethyl-cis-2,6-dimethyl piperidinium, DMP).

Advances in the Synthesis of Ferrierite Zeolite

“…Meanwhile, Long's group reported the successful synthesis of FER zeolite with the use of THF as an organic template under the hydrothermal and VPT condition [36]. More recently, we proved that the DMPi molecules could also be used as an organic template for the synthesis of aluminosilicate FER zeolite and thus obtained the nanosheet-like FER zeolite with the thickness at 6-8 nm [61].…”

“…controlled from 6 to 200 nm by just adjusting the DMP concentration in the starting gel. Very importantly, the above-mentioned aluminosilicate FER nanosheets were proven to have the excellent catalytic performance in skeletal isomerization of n-butene to isobutene, which might be potentially important for industrial application of this ultrathin nanosheet FER zeolite as a catalyst candidate in the near future [18,61]. Another morphology control strategy of aluminosilicate FER zeolite without the help of organic template was presented by Xu et al using microwave-assisted synthesis process.…”

“…In the zeolite synthesis, the application of organic templates has many advantages such as reducing the crystallization temperature and time, increasing the Si/Al ratio of the products, adjusting the properties of the products and so on. So far, a variety of organic templates, including alkylamines, cyclic amines, and alcohols have been reported to be used in the synthesis of aluminosilicate FER zeolites [ 6 , 18 , 20 , 26 , 27 , 29 , 32 , 36 , 37 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 ]. The detailed information of organic templates for synthesizing FER zeolite is shown in Table 2 .…”

Preparation of Aluminosilicate Ferrierite Zeolite Nanosheets with Controllable Thickness in the Presence of a Sole Organic Structure Directing Agent

“…More recently, we reported a simple method for synthesizing ultrathin nanosheets of aluminosilicate FER zeolite with the thickness of 6-8 nm by using a sole small organic ammonium (N,N-diethyl-cis-2,6-dimethylpiperidinium, DMP). Very interestingly, the DMP molecules not only direct the FER zeolite structure, but also inhibit the growth of FER zeolite on [100] direction, according to the theoretical calculation [43]. Therefore, it might give an opportunity for controlling the nanosheet thickness of aluminosilicate FER zeolite just by changing the amount of DMP molecules in the same synthesis system.…”

“…Further increasing the DMP/SiO 2 ratio to 0.060, the thickness of FER-0.06 nanosheets is around 10-20 nm (Figure 2d). Finally, when the DMP/SiO 2 ratio reaches 0.12, the thinnest aluminosilicate FER zeolite nanosheets (FER-0.12) with a thickness of 6-8 nm would be obtained (Figure 2e) [43]. In addition, the SiO 2 /Al 2 O 3 ratios of the FER zeolite samples with different thicknesses are all around 16.0-17.0 (Table 1), even if the amount of DMP molecules added in the synthesis gel is different.…”