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Effect of alkali and alkali halides on the interaction of sulfur dioxide with calcium oxide

Effect of alkali and alkali halides on the interaction of sulfur dioxide with calcium oxide

Journal of Colloid & Interface Science 121(2): 590-598

The interaction of SO2 with lithium-, potassium-, sodium chloride-, and sodium bromide-covered surfaces of single crystal CaO(100) at 373, 473 and 673 K was investigated using X-ray photoelectron spectroscopy. High coverages of lithium and potassium enhanced the interaction of SO2 with CaO while all coverages of sodium chloride or sodium bromide decreased the interaction. Effects due to sodium on the adsorption of SO2 on CaO have been studied previously in our laboratory. Of the three alkali metals, lithium, sodium, and potassium, the highest promotion for SO2 adsorption on CaO was observed for lithium while the lowest promotion was observed for potassium. It is postulated that the size of the alkali metal, in addition to the electronic effect, has a major contribution to the SO2 adsorption on CaO. At high coverages of potassium, two sulfur peaks corresponding to sulfide and sulfite were observed on CaO after SO2 exposures. At low potassium coverage only sulfite was observed. Two sulfur peaks were observed on Li/CaO after SO2 exposures. One sulfur peak was identified as sulfide but the binding energy of the other sulfur peak corresponded to neither sulfite nor sulfate but was located between them. This could possibly be due to Li2S2O3- or Li2SnO6-type compounds. Sulfite was the only form of sulfur on both SO2/NaCI/CaO and SO2/NaBr/CaO. NaBr decreased the adsorption of SO2 on CaO more than NaCI. Thus, the size of the anion also has a major influence on the SO2 adsorption on CaO.

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