CuO-CeO2/ZSM-5 composites for reactive adsorption of hydrogen sulphide at high temperature
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- 作者：Dongjing Liu ; Weiguo Zhou and Jiang Wu
- 刊名：The Canadian Journal of Chemical Engineering
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：94
- 期：12
- 页码：2276-2281
- 全文大小：1539K
- ISSN：1939-019X
文摘
The high-temperature H2S removal at 500–700 °C was conducted over CuO-CeO2/ZSM-5 composites prepared with sol-gel method. 7Cu3Ce/ZSM-5 partially reacting at 500 °C yielded Cu7S4 and Cu2S. The major sulphidation products at 600 °C were Ce2O2S, Cu2S, CuS, and S. Sulphidation of 7Cu3Ce/ZSM-5 at 700 °C yielded Ce2S3, Cu2S, Cu2S, and S. Sulphidation of 7Cu3Ce/ZSM-5 with 20 % H2 and 20 % CO generated the same products Ce2O2S, Cu2S, Cu2S, and S. Increase in the degree of crystallinity of 7Cu3Ce/ZSM-5 resulted in the decrease of sulphur capacity during the sulphidation and regeneration process. Experimental results showed that the activity of CuO improved by adding Ce; 7Cu3Ce/ZSM-5 performed the optimal sulphiation behaviour at 600 °C with sulphur capacity of 1429 μmol/g (micromoles of sulphur per gram) due to the synergy of CuO and CeO2. H2 repressed sulphur removal, causing the reduction of sulphur capacity from 1429 to 1014 μmol/g. CO had little impact on sulphidation reaction; sulphur capacity only reduced from 1429 to 1221 μmol/g due to the presence of 20 % CO.