H2S REMOVAL AND REGENERATION MECHANISM OF NH3–CUO/13X-3 ADSORBENT.
Newswise — Impregnation of transition metal oxides onto zeolite is a common strategy to prepare H2S adsorbent. However, this method usually results in the agglomeration of metal particles during calcination, forming relatively large metal particles. The large metal particle may increase the gas diffusion resistance in adsorbent and inhibit the desulfurization performance. Therefore, minimizing the metal particles on zeolite with a high loading is the key for the preparation of an adsorbent with high sulfur capacity.
To this end, a team of researchers from the Institute of Process Engineering, Chinese Academy of Sciences, has proposed an ammonia induction strategy. In the process of loading copper oxide onto 13X zeolite by impregnation method, ammonia was introduced, and a Cu based complex formed firstly and then adsorbed on zeolite, which was converted to CuO in the subsequent calcination process.
"The introduction of ammonia effectively inhibits the agglomeration and increases the dispersibility of CuO particles during calcination, prevents the plugging of zeolite pores, improves the diffusion of H2S during desulfurization, and thus increases the adsorption rate and sulfur capacity of H2S adsorbent." shared Erping Cao, lead author of the study (https://doi.org/10.1016/j.gee.2024.02.002) published in the KeAi journal Green Energy and Environment. "The H2S adsorption capacity of NH3-CuO/13X adsorbent prepared by ammonia induction is more than twice that of CuO/13X adsorbent".
Notably, similar results were obtained when the ammonia induction strategy was applied to the other kind of zeolite-based adsorbents.
"Based on the ammonia induction strategy, we have provided a general approach for the preparation of transition metal oxide/zeolite adsorbents with high sulfur capacity," adds corresponding author Yanbin Cui.
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References
DOI
Original Source URL
https://doi.org/10.1016/j.gee.2024.02.002
Funding information
This study is financially supported by National Natural Science Foundation of China (Grant. 22076189), National Key Research and Development Program of China (No. 2023YFC3707003), and the Joint Fund of Yulin University and Dalian National Laboratory for Clean Energy (Grant. YLU-DNL Fund 2022003).
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