AI Article Synopsis
- Rhodium catalyst layers (1 wt%) supported on alumina, titania, and ceria-zirconia were created by dip-coating stainless-steel sheets with nanoparticle dispersions.
- Low-temperature steam reforming of propane showed that titania and ceria-zirconia supports outperformed alumina, starting conversion at 250°C and achieving over three times better conversion at 350°C.
- The addition of PEG 2000 improved layer stability by preventing cracking and enhanced the porosity, maintaining catalytic efficiency even with increased film thickness.
Article Abstract
Catalyst layers (4-20 microm) of rhodium (1 wt%) supported on alumina, titania, and ceria-zirconia (Ce(0.5)Zr(0.5)O(2)) were coated on stainless-steel corrugated sheets by dip-coating in very stable colloidal dispersions of nanoparticles in water. Catalytic performances were studied for low-temperature (< or = 500 degrees C) steam reforming of propane at a steam to carbon ratio equal to 3 and low contact time (approximately 0.01 s). The best catalytic activity for propane steam reforming was observed for titania and ceria-zirconia supports for which propane conversion started at 250 degrees C and was more than three times better at 350 degrees C than conversion measured on alumina catalyst. For all catalysts a first-order kinetics was found with respect to propane at 500 degrees C. Addition of PEG 2000 in titania and ceria-zirconia sols eliminated the film cracking observed without additive with these supports. Besides, the PEG addition strongly expanded the porosity of the layers, so that full catalytic efficiency was maintained when the thickness of the ceria-zirconia and titania films was increased.
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| http://dx.doi.org/10.1016/j.jcis.2009.04.079 | DOI Listing |
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Article Synopsis
- Rhodium catalyst layers (1 wt%) supported on alumina, titania, and ceria-zirconia were created by dip-coating stainless-steel sheets with nanoparticle dispersions.
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