[논문]H2S adsorption on NaY zeolite

de Oliveira, Leonardo Hadlich; Meneguin, Joziane Gimenes; Pereira, Marcus Vinicius; da Silva, Edson Antonio; Grava, Wilson Mantovani; do Nascimento, Jailton Ferreira; Arroyo, Pedro Augusto

doi:10.1016/j.micromeso.2019.04.014

H2S adsorption on NaY zeolite

Microporous and mesoporous materials : the official journal of the International Zeolite Association, v.284, 2019년, pp.247 - 257

de Oliveira, Leonardo Hadlich (Laboratory of Adsorption and Ion Exchange (LATI), Department of Chemical Engineering (DEQ), State University of Maringá) , Meneguin, Joziane Gimenes ((UEM)) , Pereira, Marcus Vinicius (Laboratory of Adsorption and Ion Exchange (LATI), Department of Chemical Engineering (DEQ), State University of Maringá) , da Silva, Edson Antonio ((UEM)) , Grava, Wilson Mantovani (Laboratory of Adsorption and Ion Exchange (LATI), Department of Chemical Engineering (DEQ), State University of Maringá) , do Nascimento, Jailton Ferreira ((UEM)) , Arroyo, Pedro Augusto (Course of Chemical Engineering, State University of Western Paraná)

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Abstract In this work, high-pressure H2S adsorption data in equilibrium and fixed bed conditions using NaY zeolite as adsorbent were determined. Adsorption and desorption isotherms for different temperatures and H2S partial pressures up to 1.2 bar were obtained experimentally and modelled with Tóth and Dubinin-Astakhov equations in order to give information about adsorbate/adsorbent and adsorbate/adsorbate interactions. H2S adsorption in a fixed bed column was achieved for different inlet volumetric flow rates and breakthrough curve data were evaluated considering adsorbed amount, length of mass transfer zone, contributions of internal and external mass transfer resistances and were modelled with Linear Driving Force (LDF) model to estimate adsorbent particle's effective mass transfer coefficient. Equilibrium results indicate maximum uptake capacities are above 6.0 mol kg−1 for highest partial pressures. Isotherms' modeling suggests the predominance of physisorption of H2S in NaY zeolite. However, a hysteresis effect was observed for desorption curves and attributed to H2S chemisorption on zeolite surface, as pointed out by strongly favorable isotherms obtained. Fixed bed adsorption data showed breakthrough curves were nonsymmetrical, which indicated the presence of internal resistance mainly, probably due to the microporosity of adsorbent particle. In accordance, mass transfer zones did not vary significantly with inlet flow rate. Effective intraparticle mass transfer coefficients obtained with LDF model increases as flow rate increases, due to a higher availability of H2S molecules at adsorbent surface, which increases the driven force necessary for mass transfer in the intraparticle region. Highlights Strongly favorable H2S isotherms on NaY were determined by high pressure gas adsorption using the partial pressure of this gas on a mixture with helium. Tóth and Dubinin-Astakhov models can be used together to give information about adsorbate/adsorbent and adsorbate/adsorbate interactions. Heats of adsorption for H2S adsorption on NaY zelite were calculated. H2S desorption indicated interaction between H2S and NaY is due to dissociation chemisorption. H2S adsorption on NaY zeolite fixed bed suggests the presence of internal and external mass transfer resistances. Graphical abstract [DISPLAY OMISSION]

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H2S adsorption on NaY zeolite

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