Cation-exchanged zeolites as the adsorbent for H 2S: Quantum chemical calculations

Chun Yi Sung, Matteo Cococcion, Alon V McCormick, Michael Tsapatsis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To investigate the potentials of LiY, NaY, KY, CuY, AgY, Cu IIY, Zn IIY, and Ni IIY zeolites as the adsorbent for hydrogen sulfide (H 2S) from Claus process tail gas, quantum chemical calculations based on density functional theory (DFT) were employed to study the adsorption properties of H 2S and other common impurities (CO, H 2O, N 2, and CO 2) using the zeolite cluster model that includes a six-membered ring. AgY was predicted to be the best adsorbent for H 2S, whereas CuY is subject to strong adsorption of CO, and alkali cation- and divalent cation- exchanged Y are subject to strong adsorption of H 2O. These results are in qualitative agreement with our experimental findings. To reveal the effect of the zeolite framework on the adsorption properties, simplified calculations that included only the adsorbate and only the cation were also carried. The same configuration for each adsorbate was found despite difference in cations and the presence of the zeolitic framework atoms. For LiY, NaY, and KY zeolites, the simplified calculations predict the same dominant adsorbates as the cluster calculations. However, for CuY and AgY, the simplified calculations fail to capture the strong adsorption of CO.

Original languageEnglish (US)
Title of host publication11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2011
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN, United States
Duration: Oct 16 2011Oct 21 2011

Publication series

Name11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings

Other

Other2011 AIChE Annual Meeting, 11AIChE
CountryUnited States
CityMinneapolis, MN
Period10/16/1110/21/11

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