Preparation and Gas Separation Performance of P25 Hybrid Carbon Membranes

doi:10.3724/SP.J.1077.2013.12352

Abstract

Abstract:

P25 hybrid carbon membranes were prepared by adding the commercial P25 particles into the precursor. Effects of P25 particles on the pyrolysis, carbon structure and gas separation performance of hybrid carbon membranes were characterized by means of TG, SEM, TEM and XRD. The results indicate that the thermal stability of polymer precursor is improved by the incorporation of P25 particles. Gas separation performances of hybrid carbon membrane are greatly improved with the addition of P25 particles due to the accumulate voids formed by the agglomeration of P25 particles and interfacial pores formed between P25 particles and carbon matrix. Molecular sieve mechanism is still conformed in the gas separation of hybrid carbon membranes. Gas permeability increases and gas selectivity remains with the increase of P25 loading. And the gas permeability reduces and gas selectivity increases as final carbonization temperature rises. The permeabilities of H₂, CO₂, O₂, N₂ and CH₄ are 1769.2, 1558.6, 410.2, 55.5, 26.8 Barrer, respectively, for the hybrid carbon membrane prepared with 20wt% P25 loading and at 700℃ carbonization temperature.

Key words: carbon membrane, gas separation, hybrid carbon membrane, titanium dioxide

CLC Number:

TQ174

SUN Mei-Yue, LI Lin, ZHANG Ping-Ping, XU Jia-Jia, YU Jiao-Zhu, WANG Tong-Hua. Preparation and Gas Separation Performance of P25 Hybrid Carbon Membranes[J]. Journal of Inorganic Materials, 2013, 28(5): 485-489.

Figures/Tables 8

Fig. 1 Gas permeability test instrument by constant pressure- variable volume method

Fig. 2 Thermal gravimetry curves of polyamic acid film and P25 hybrid polyamic acid film

Fig. 3 XRD patterns of P25 hybrid carbon membrane with different P25 loadings

Fig. 4 XRD patterns of P25 hybrid carbon membrane carbonized at different temperatures

Fig. 5 Cross sectional SEM images of P25 hybrid carbon membrane

Fig. 6 TEM images of P25 particles and P25 hybrid carbon membrane

Fig. 7 Gas separation performance of carbon membrane with different P25 loadings (a) Gas permeability; (b) Gas selectivity

Fig. 8 Gas separation performance of P25 hybrid carbon membrane with different carbonization temperatures (a) Gas permeability; (b) Gas selectivity

References 15

[1]	Hagg M B, Lie J A, Lindbrathen A. Carbon molecular sieve membranes,a promising alternative for selected industrial applications. Ann. N.Y. Acad. Sci.,2003, 984: 329-345.
[2]	Suda H, Haraya K. Gas Permeation through micropores of carbon molecular sieve membranes derived from kapton polyimide. J. Phys. Chem. B, 1997, 101(20): 3988-3994.
[3]	Anshu S G, Koros W J. Air separation properties of flat sheet homogeneous pyrolytic carbon membranes. J. Membr. Sci., 2000, 174(2): 177-188.
[4]	Tin P S, Xiao Y C, Chung T S. Polyimide-carbonized membranes for gas separation: structural, composition, and morphological control of precursors. Sep. & Pur.Re., 2006, 35(1): 285-318.
[5]	Lee L L, Tsai D S. Synthesis and permeation properties of silicon- carbon-based inorganic membrane for gas separation. Ind. Eng. Chem. Res., 2001, 40(2): 612-616.
[6]	Kusakabe K, Yamamoto M, Morooka S. Gas permeation and micropore structure of carbon molecular sieving membranes modified by oxidation. J. Membr. Sci., 1998, 149(1): 59-67.
[7]	LI Lin, WANG Tong-Hua, CAO Yi-Ming, et al. Physica design, prepara tion and functionalization ofcarbon membranes for gas separation. Journal of Inorganic Materials, 2010, 25(5): 449-456.
[8]	WANG Nan, WANG Tong-Hua, LI Lin, et al. Fabrication and gas separation properties of zeolite Y/carbon hybrid membranes. Journal of Chemical Engineering of Chinese Universities, 2009, 23(1): 126-130.
[9]	Liu Q L, Wang T H, Qiu J S, et al. A novel carbon/ZSM-5 nanocomposite membrane with high performance for oxygen/nitrogen separation. Chem. Comm., 2006, 6(11): 1230-1232.
[10]	ZHAO Xuan-Ying, WANG Tong-Hua, LI Lin, et al. Polymide/ Fe3O4-carbonized membranes for gas separation. Journal of Inorganic Materials, 2010, 25(1): 47-52.
[11]	Liu Q L, Wang T H, Guo H C, et al. Controlled synthesis of high performance carbon/zeolite T composite membrane materials for gas separation. Micropor. Mesopor. Mater., 2009, 120(3): 460-466.
[12]	刘庆岭. 功能炭膜的设计、制备及其气体分离性能. 大连: 大连理工大学博士论文, 2008.
[13]	Lua A C, Su J C. Structural changes and development of transport properties during the conversion of a polyimide membrane to a carbon membrane. J. Appl. Polym. Sci., 2009, 113(1): 235-242.
[14]	WU la-Ying, LI Chang-Jiang. The synthesis of nano-TiO2 powder by Sol-Gel method and the phase transformation. Journal of Inorganic Materials, 2002, 18(4): 399-403.
[15]	Steel K M, Koros W J. Investigation of porosity of carbon materials and related effects on gas separation properties. Carbon, 2003, 41(2): 253-266.