Alternative formulations of regenerable flue gas cleanup catalysts. Progress report, September 1, 1991--August 31, 1992
We have used non-aqueous impregnation techniques to prepare an aluminum oxide surface covered with a well-dispersed magnesium oxide layer using magnesium acetylacetonate dehydrate [Mg(acac){sub 2}{sm_bullet}2H{sub 2}0] as a precursor. Using lithium acetylacetonate as a precursor, we have begun attempts to prepare a similarly well dispersed surface layer of lithium ``oxide.`` We have generated higher weight loadings of magnesium on alumina by using a Soxhlet extractor to dissolve the sparingly soluble Mg(acac){sub 2}{sm_bullet}2H{sub 2}0 in methanol. With this device we are able to obtain loadings of MgO on the alumina up to 0.66 wt/wt%. The precursor samples were examined by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and our results indicate that the complex loses the water of hydration upon adsorption. It appears, however, that the initial form of the complex on the surface is as anhydrous crystallites. Heating the supported precursor under vacuum leads to ``melting`` of the crystals, which can be observed by DRIFTS. Decomposition of the precursor under nitrogen or air leads to very similar activity when adsorbing SO{sub 2}. SO{sub 2} uptake appears to be independent of whether O{sub 2} is Present in the gas stream or not. We have shown that SO{sub 2} adsorption increases with Mg-loading on the impregnated aluminas, with 0.85 additional molecules Of SO{sub 2} adsorbed for each additional Mg atom (or MgO molecule) on the surface. We have shown that non-aqueous impregnation leads to samples which are more efficient with regard to SO{sub 2} uptake per magnesium atom than aqueous impregnation.
- Research Organization:
- Clark Atlanta Univ., GA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90292
- OSTI ID:
- 10142538
- Report Number(s):
- DOE/PC/90292-T8; ON: DE93012281
- Resource Relation:
- Other Information: PBD: 1992
- Country of Publication:
- United States
- Language:
- English
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