Synthesis and Characterization of B-Substituted High-siliceous STW-type Silicate Zeolite†

doi:10.7503/cjcu20150124

Abstract

Abstract:

Using 2-ethyl-1,3,4-trimethylimidazolium as structure-directing agent(SDA), B-substituted STW-type silicate zeolite(B-STW) was synthesized in a concentrated gel at 175 ℃ for 2—5 d. The B-STW sample was characterized by the inductively coupled plasma analysis(ICP), X-ray diffraction(XRD), scanning electron microscope(SEM), N₂ adsorption-desorption isotherm, Fourier transform infrared spectroscopy(FTIR) and temperature programmed desorption of ammonia(NH₃-TPD) analyses. The results show that B-STW has weak acidity after removal of SDA and is thermally stable up to 750 ℃.

Key words: B-substituted silicate zeolite, STW framework, Chiral zeolite, Concentrated gel synthesis, Ionic liquid

CLC Number:

O611.4

TrendMD:

SHI Lei, YU Tingting, LIN Sen, YUAN Yubin, WANG Jikai, ZHANG Na. Synthesis and Characterization of B-Substituted High-siliceous STW-type Silicate Zeolite^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1467.

Figures/Tables 6

Fig.1 1H NMR spectrum of template 2E134TMI

Fig.2 Simulated XRD pattern of HPM-1(a), experimental XRD patterns of the as-synthesized B-STW(b), and calcined B-STW with Si/B molar ratios of 48.6(c) and 36.4(d)

Fig.3 SEM image of typical B-STW [n(Si)/n(B)=36.4]

Fig.4 Nitrogen adsorption-desorption isotherm at 77 K(A) and pore size distribution curve(B) of calcined B-STW[n(Si)/n(B)=36.4]

Fig.5 FTIR spectra of calcined Si-STW(a) and calcined B-STW[n(Si)/n(B)=36.4](b)

Fig.6 NH3-TPD of calcined B-STW[n(Si)/n(B)=36.4]

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