Textural and hydrogen sulphide adsorption behaviour of double metal-silica modified with potassium permanganate
2013 (English)In: Journal of porous materials, ISSN 1380-2224, E-ISSN 1573-4854, Vol. 20, no 3, 447-455 p.Article in journal (Refereed) Published
A new MgCa-silica material with bimodal pore size is impregnated with KMnO4 for dynamic adsorption of H2S. The MgCa-silica was synthesized using sodium silicate and calcium and magnesium salts as precipitating agents. The KMnO4 impregnation onto MgCa-silica was obtained through either direct addition into MgCa-silica wet coagulum or doping of dried MgCa-silica pellets into KMnO4 solution. These chemisorbents were characterized by nitrogen physisorption, spectrophotometer, microscopy and dynamic H2S adsorption test setup similar to ASHRAE standard I45.I. The results show that impregnation route and KMnO4 wt% cause a reduction of surface area and total pore volume. The decrease in pore volume was slightly more in chemisorbents obtained via post doping compared to direct impregnation. Regardless of pore volume reduction the pore size range, 1-32 nm, was as in the parent MgCa-silica with micro and meso-pore diameter centered at 1.4 and 5.4 nm respectively. Thus obtained chemisorbents have their pore entrances neither blocked nor shifted. The MgCa-silica/KMnO4 chemisorbents exhibits good H2S uptake performance. The chemisorbent with 11.4 wt% KMnO4 and obtained via direct impregnation possesses the highest uptake capacity. The lowest capacity was observed for chemisorbent with 8 wt% KMnO4 and made by direct impregnation. The variations in uptake capacity are likely due to impregnation route, the KMnO4 content and its location in the pore system. The results suggest that the MgCa-silica/KMnO4 chemisorbents can remove H2S from indoor air at room temperature.
Place, publisher, year, edition, pages
2013. Vol. 20, no 3, 447-455 p.
Hydrogen sulphide, KMnO4 impregnation, H2S adsorption, Textural properties, Pore size
IdentifiersURN: urn:nbn:se:kth:diva-120460DOI: 10.1007/s10934-012-9614-xISI: 000318369400001ScopusID: 2-s2.0-84877827331OAI: oai:DiVA.org:kth-120460DiVA: diva2:614997
QC 201306102013-04-082013-04-082016-08-16Bibliographically approved