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Effective mesoporous silica-ZIF-8 nano-adsorbents for adsorptive desulfurization of gas stream

2017; Elsevier BV; Volume: 82; Linguagem: Inglês

10.1016/j.jtice.2017.10.037

1876-1089

Raheleh Saeedirad, Saeed Taghvaei Ganjali, Mansour Bazmi, Alimorad Rashidi,

Metal-Organic Frameworks: Synthesis and Applications

New hybrids ([email protected], [email protected] and [email protected]) were synthesized using mesopore templates for the growth of ZIF-8 nanoparticles and characterized by FT-IR, XRD, FE-SEM and BET analyses. The sulfur-removal performance of prepared hybrids were then investigated by changing temperature from 30 to 50°C under the operational conditions of 34,000 h−1 space velocity and the feed concentrations of 45,000 and 1300 ppm for H2S and CH3CH2SH from gas stream, respectively. The optimum breakthrough capacities for [email protected], [email protected] and [email protected] by setting the temperature at 30°C were reported as 4.92, 5.21 and 6.12 g S/g sorbent for the removal of hydrogen sulfide and 1.32, 1.30 and 1.47 g S/g sorbent for the removal of ethyl mercaptan, respectively. [email protected] was shown as the best nano-adsorbent due to the dual-pore size distribution (pore size: 1.22 and 47.67 nm), and higher BET surface area of about 937.23 m2/g in contrast to [email protected] (849.99 m2/g), and [email protected] (770.79 m2/g). In addition, the introduction of metal active sites of Zn is associated with the improved properties of synthesized nano-adsorbents compared to the starting mesopore templates. The uptake capability of the synthesized nano-adsorbents have only reduced to about 6–9% and 9–12% after 4 cycles of hydrogen sulfide and ethyl mercaptan adsorption, respectively.