Study of low temperature H2S removal on Ce-Cu-Al-O mixed metal oxide adsorbents

A series of Ce-Cu-Al-O mixed metal oxide adsorbents for deep removal of H2S at low temperature was prepared by a co-precipitation method. Characterization methods such as XRD,N2 physical adsorption,SEM,XPS were used to analyze the samples before and after desulfurization. The influence of Ce content,calcination temperature,space velocity,adsorption temperature and impurity gas on the removal of H2S was investigated. It was found that Ce-Cu-Al-O adsorbents were able to remove H2S from CO2 at 40℃and the adsorbent with 10% Ce (10Ce-Cu-Al-O) exhibited the highest breakthrough capacity of 94.1mg/g. The characterization results show that the addition of CeO2 could effectively improve the dispersion of CuO,the BET surface areas and pore volumes of the adsorbents. A relatively high calcination temperature,high space velocity and balance gas CO2 will all inhibit the H2S adsorption. The H2S breakthrough capacity of 10Ce-Cu-Al-O increased with temperature and there was no COS impurities generated when the desulfurization temperature was not higher than 100℃. The characterization results of the used adsorbents showed that the aggregate components resulted in the decrease of the BET surface areas and pore volumes. In addition,the regeneration experiment indicated that a relatively low temperature of 100℃ can be applied to regenerate the used 10Ce-Cu-Al-O adsorbents in air. © 2016, Chemical Industry Press. All right reserved.