Catalytic steam and autothermal reforming of used lubricating oil (ULO) over Rh- and Ni-based catalysts
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Author list: Wetwatana U., Kim-Lohsoontorn P., Assabumrungrat S., Laosiripojana N.
Publication year: 2010
Volume number: 49
Issue number: 21
Start page: 10981
End page: 10985
Number of pages: 5
ISSN: 0888-5885
eISSN: 0888-5885
Languages: English-Great Britain (EN-GB)
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Abstract
The steam reforming of used lubricating oil (ULO) over Ni- and Rh-based catalysts supported by Ce-ZrO2 and Al2O3 is studied in the present work. Among all catalysts, Rh/Ce-ZrO2 (5 wt % Rh) provides relatively higher reforming reactivity (in terms of ULO conversion and H2 yield) with excellent resistance toward carbon deposition compared to the other three catalysts. At 850 ฐC after exposure in the steam reforming condition for 72 h, H2 yield of 78.1% can be achieved from the reaction over Rh/Ce-ZrO2. For Ni/Ce-ZrO2 and Ni/Al2O3, significant deactivations with time are detected and H2 yields of 55.3-58.7% are achieved after exposure for 72 h; in addition, considerable amounts of C2H4, C 2H6 and C3H6 are also found in the product along with H2, CO, CO2, and CH4. The effect of O2 addition was further studied over Ni/Ce-ZrO2 and Ni/Al2O3. It was found that this addition significantly reduces the degree of carbon deposition as well as promoting the conversion of hydrocarbons to CO and H2. At a suitable amount of O2, a high H2 yield comparable to that of steam reforming over Rh-based catalysts can be achieved. Nevertheless, it must be noted that introducing too high an O2 content resulted in lower H2 production due to the combustion of H2 and ULO by O2 addition. ฉ 2010 American Chemical Society.
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