Adsorption of 1,2-dichloroethane on ZSM-5 and desorption dynamics by in situ synchrotron powder X-ray diffraction
Adsorption of 1,2-dichloroethane on ZSM-5 and desorption dynamics by in situ synchrotron powder X-ray diffraction
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DOI：
10.1016/j.micromeso.2015.05.035
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发表时间：
2015-10
影响因子：
5.2
通讯作者：
A. Martucci;E. Rodeghero;L. Pasti;Valentina Bosi;G. Cruciani
中科院分区：
文献类型：
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作者：
A. Martucci;E. Rodeghero;L. Pasti;Valentina Bosi;G. Cruciani
使用原位同步辐射 X 射线粉末衍射技术在 30°–600°C 的温度范围内研究了负载 1,2-二氯乙烷的 ZSM-5 的吸附/解吸行为。 Rietveld 的改进允许监测 DCE 分解过程以及 ZSM-5 在程序升温热处理过程中发生的结构修改。这些结果清楚地表明，在约 300 °C 下对吸附剂进行热处理时，ZSM-5 的再生是有效的，从而最大限度地降低了吸附过程再生步骤的成本。一旦再生并重新加载，Rietveld 精修表明 DCE 位置和含量基本保持不变，从而证实 ZSM-5 能够以与第一个循环中吸附的量相当的量重新吸附 DCE，与色谱结果非常一致。总之，在温和条件下热再生后，使用这种吸附性能不变的吸附剂在吸附/解吸过程的几个循环中也显得非常有前景。
The adsorption/desorption behaviour of ZSM-5 loaded with 1,2-dichloroethane was studied using thein situsynchrotron X-ray powder-diffraction technique in the temperature range 30°–600 °C. Rietveld refinements allowed to monitor the DCE decomposition process as well as the structural modifications undergoing on ZSM-5 upon a temperature-programmed thermal treatment. These results clearly demonstrated that regeneration of ZSM-5 is effective when thermally treating the adsorbent at about 300 °C thus minimising the cost of the regeneration step of the adsorption process. Once regenerated and reloaded the Rietveld refinement indicates that both DCE location and content remain substantially unchanged thus confirming ZSM-5 is able to re-adsorb DCE in amounts comparable to that adsorbed in the first cycle, in very good agreement with the chromatographic results. In conclusion, the use of this adsorbent with unchanged adsorption performances after thermal regeneration under mild conditions appears very promising also over several cycles of the adsorption/desorption process.