Influence of Building Blocks on Gas Adsorption Performance of Porous Aromatic Frameworks†

doi:10.7503/cjcu20170781

Abstract

Abstract:

We synthesized and characterized two kinds of analogical porous aromatic frameworks by selecting two different building blocks, 1,3,5-tribromobenzene(TBB) and 3,3',5,5'-terabromo-1,1'-biphenyl(TBBP), catalyzed by Yamamoto type Ullman coupling reaction. The results proved that the properties of the porous aromatic frameworks are similar. Both of them show higher BET surface areas, uniform pore size distributions, excellent stability, and potential applications in gas adsorption and storage. Meanwhile, the differences in specific surface area and gas adsorption between the porous aromatic frameworks can be attributed to the differences between the building blocks.

Key words: Porous aromatic framework, Gas adsorption, Building block, Coupling reaction

CLC Number:

O631

TrendMD:

YAN Tingting,XING Guolong,BEN Teng,QIU Shilun. Influence of Building Blocks on Gas Adsorption Performance of Porous Aromatic Frameworks^†[J]. Chem. J. Chinese Universities, 2018, 39(5): 1072.

Figures/Tables 6

Scheme 1 Schematic illustration of targeted synthesis of PTBB and PTBBP

Fig.1 FTIR spectra of TBB(a), PTBB(b), TBBP(c), PTBBP(d)(A), 13C CP/MAS NMR of PTBBP(B), PXRD patterns of PTBB(a) and PTBBP(b) from 4° to 40°(C) and SEM image of PTBBP(D)

Fig.2 TGA curves of PTBB(a) and PTBBP(b) from 50 ℃ to 800 ℃ under air condition with the ramping rate of 10 ℃/min

Fig.3 N2 adsorption(A) and pore size distribution(B) of PTBB(a) and PTBBP(b) at 77 K

Table 1 Texture properties of PTBB and PTBBP

Sample	S_BET/(m²·g^-1)	Pore size/nm	V_total/(cm³·g^-1)	V_micro/(cm³·g^-1)
PTBB	1908	1.0, 1.6, 2.7	1.74	0.44
PTBBP	1599	1.0, 1.6, 2.9	0.53	0.41

Fig.4 CO2(A), H2(B), CH4(C) sorption isotherms and Qst, CO2(D), Qst,H2(E), Qst, CH4(F) of PTBB(a) and PTBBP(b) at 273 K and 1.01×105 Pa

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