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Mercury Adsorption by Sulfurized Fibrous Silicates

Published online by Cambridge University Press:  02 April 2024

L. Daza ,
S. Mendioroz  and
J. A. Pajares
L. Daza
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Serrano 119, 28006 Madrid, Spain
S. Mendioroz
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Serrano 119, 28006 Madrid, Spain
J. A. Pajares
Affiliation:
Instituto del Carbón, C.S.I.C., La Corredoria, s/n. Oviedo, Spain
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Abstract

To eliminate mercury vapor from gas streams, three major methods are used: condensation, absorption, and adsorption. This work deals with adsorption, using elemental sulfur as an active phase supported on sepiolite and palygorskite fibrous clays. Sulfur loads of 5–30% were deposited by catalytic oxidation of hydrogen sulfide at temperatures of <200°C, the clays acting first as a catalyst of the reaction and then as a carrier of the obtained sulfur. The ability of the sulfurized clay adsorbents to retain mercury was studied at 45°C and 1 mm Hg pressure. The high values found, about 4 g Hg/g S supported on clays, compared with 1.69 g Hg/g S on activated carbon under the same conditions are related to a more appropriate pore size distribution, with more of the pore widths >6 nm for the sulfurized silicates. Also, the allotropic state of the deposited sulfur, where Sπ (octo-catena) is better than Sλ (octo-cycle), may also be a contributing factor.

Keywords

Activated carbonAdsorptionMercuryPalygorskitePore size distributionSepioliteSulfurized silicates
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 1 , February 1991 , pp. 14 - 21
Copyright
Copyright © 1991, The Clay Minerals Society

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