Synthesis, Characterization and Gas Adsorption Properties of Two New Porous Metal-organic Gels†

doi:10.7503/cjcu20150097

Abstract

Abstract:

Two new porous metal-organic gels(Al-wet gel and Cr-wet gel) were synthesized by self-assembly of 1,4-di-(3'-acetylacetonato)benzene and corresponding transition metal salts, then Al-xerogel and Cr-xerogel were obtained by direct drying two wet gels. The gels were characterized by powder X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM), Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis(TGA), energy dispersive spectrometry(EDS) and N₂ sorption experiments. The results indicate that the Al-xerogel and Cr-xerogel are formed by uniformed spherical nanoparticals. The unique structures show high microporisity and a small amount of mesopores as well as high thermal stability. Furthermore, these materials performed gas adsorption property. The Al-xerogel has a surface area of 790.3 m²/g, and it could adsorbe 117.45 cm³/g H₂ at 77 K and 1.01×10⁵ Pa and 60.74 cm³/g CO₂ at 273 K and 1.01×10⁵ Pa.

Key words: Metal-organic gel, 1, 4-Di-(3'-acetylacetonato)benzene, Gas adsorption

CLC Number:

O614

TrendMD:

CHEN Siru, XUE Ming, PAN Ying, XU Dan, QIU Shilun. Synthesis, Characterization and Gas Adsorption Properties of Two New Porous Metal-organic Gels^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 815.

Figures/Tables 8

Deprotonation of DAB and synthesis of the metal-organic gel(M=Al, Cr)

Fig.1 PXRD patterns of Al-xerogel(a) and Cr-xerogel(b)

Fig.2 FTIR spectra of DAB(a), Al-xerogel(b) and Cr-xerogel(c)

Fig.3 EDS spectra of Al-xerogel(A) and Cr-xerogel(B)

Fig.4 SEM(A, B) and TEM(C, D) images of Al-xerogel(A, C) and Cr-xerogel(B, D)

Fig.5 TGA curves of Al-xerogel(A) and Cr-xerogel(B)

Fig.6 N2 sorption isotherms at 77 K(A, C) and pore size distributions(B, D) of Al-xerogel(A, B) and Cr-xerogel(C, D)

Fig.7 H2(A), CO2(B) and CH4(C) sorption isotherms of Al-xerogel(a) and Cr-xerogel(b) Temperature/K: (A) 77; (B), (C) 273.

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