Characterization of Reaction between ZnO and COS

Abstract

In order to understand the behavior of COS in a ZnO desulfurization reactor, the reaction between ZnO and COS was studied in the presence of gases which compose a coal-derived gas. The behavior of COS in the reaction zone of a ZnO packed bed can be predicted as follows: H2S in coal-derived gas reacts more easily with ZnO than COS; most of COS is converted to H2S by catalytic hydrolysis and then reacts with ZnO, although a part of COS may react directly with ZnO; H2 accelerates the conversion of COS to H2S; the water−gas shift reaction accelerates the reaction between ZnO and COS; and CO2 does not affect the reaction.

H2S removal with ZnO during fuel processing for PEM fuel cell applications

“…The sulfur breakthrough capacities appear to be strongly correlated with the calculated COS concentrations, as described by reaction (2). We believe that the apparent low H 2 S capacities are actually the result of COS in the product, since ZnO cannot remove COS efficiently [8], and our analytical system was not set up to distinguish between H 2 S and COS (it proved difficult to obtain a COS standard). Fig.…”

“…It is known that H 2 S can react with CO or CO 2 to form COS through the following two reactions [6][7][8]:…”

Activation of pyrolytic tire char with CO2: kinetic study

“…Lee and Kim [28] used the shrinking core model [29], the homogeneous model [30] and the modified volumetric model [31] to analyze the results obtained in the CO 2 activation of waste tire in a thermobalance. They found good agreement between experimental and theoretical data using the modified volumetric model finding a rate expression in terms of temperature, CO 2 partial pressure and solid conversion.…”

Zinc sulfidation by H2S and H2S/H2O supercritical fluids: Synthesis of nanoparticles and catalytic effect of water

“…The former could be catalyzed by the formed ZnS and ZnO nanoparticles [37,38]. The dominant role of the homogenous reactions (7) and (8) in Test 2 is accounted for by the fact that the high density of H 2 S and H 2 O molecules is maintained in the reactor up to the end of the reaction (Table 1).…”