Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (11): 2158-2164.doi: 10.3866/PKU.WHXB201510091

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Improvement of Adsorptive Separation Performance for C2H4/C2H6 Mixture by CeO2 Promoted CuCl/Activated Carbon Adsorbents

Jian-Dong. XING1,2,Fang-Li. JING1,2,Wei. CHU1,2,*(),Hong-Li. SUN1,Lei. YU1,Huan. ZHANG1,Shi-Zhong. LUO1,*()   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, P. R. China
  • Received:2015-07-10 Published:2015-11-13
  • Contact: Wei. CHU,Shi-Zhong. LUO E-mail:chuwei1965scu@163.com;luosz@scu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21476145)

Abstract:

CeO2 promoted CuCl/activated carbon (AC) adsorbents were prepared using an incipient wetness impregnation method, and characterized using N2 adsorption/desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The Cu(II) on the AC surface was reduced to Cu(I) when calcination was performed in a nitrogen flow. The effects of Ce on the C2H4/C2H6 adsorptive separation performance were investigated. The adsorption isotherms showed that the addition of CeO2 improved the separation performance by decreasing the C2H6 adsorption capacity compared with that of the nonpromoted sample. The XRD and XPS results indicated that the active crystal particles on the AC surface became smaller, leading to higher dispersion and a higher degree of Cu(II) reduction. The best adsorption selectivity was obtained using the 5Ce50Cu [CeO2 and CuCl2 mass fractions (w) 5% and 50%, respectively] sample, i.e., with CeO2 in the adsorbent; the adsorption selectivity increased from 4.2 to 8.7 at 660 kPa compared with that of the 50Cu sample.

Key words: C2H4, Pressure swing adsorption, Adsorption selectivity, CeO2 promoter, Cu(I) active site, Surface characterization

MSC2000: 

  • O647