Thermal studies of metal promoted sulfated zirconia
- Western Kentucky Univ., Bowling Green, KY (United States); and others
Solid oxide catalysts have been widely used in petroleum refining for skeletal isomerization of paraffins and to isomerize alkanes to produce oxygenates. Sulfated zirconia catalysts show high activity for isomerization of hydrocarbons. SO{sub 4}{sup 2-}-ZrO{sub 2} is considered to be a superacid catalyst. The metal promotion on sulfated zirconia has been shown to enhance the stabilities of the catalysts. The activation of these catalysts involves complex chemical changes. In the present investigation, a simultaneous TG/MS technique was utilized to investigate the weight loss and to monitor the chemical compounds that evolve under controlled heating in different environments. Some insight of the activation mechanism of the catalysts was thus obtained. The evolution of HCl and Cl, were well identified according to the mass ratio of Cl isotopes. The evolution of SO{sub 2} and SO showed a continuum beyond 900{degrees}C which corresponds to the TG results. This indicated SO{sub 4}{sup 2-} is present in the solid in a variety of structures. The samples were also analyzed in STD (TGA-DTA). The results show so far sulfate ion is the most efficient species to retard the phase transformation process of zirconia.
- OSTI ID:
- 433095
- Report Number(s):
- CONF-960376--
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry Journal Issue: 1 Vol. 41; ISSN ACFPAI; ISSN 0569-3772
- Country of Publication:
- United States
- Language:
- English
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