Abstract
In this work we present results of hydrogen generation from diesel via autothermal reforming (ATR) obtained with monolithic catalysts consisting of either one or two layers of monometallic Rh and bimetallic RhPt washcoats. The Rh metal loading of the monometallic washcoats was varied between 0.5, 1.0 and 3.0wt%, while the weight ratio of Rh:Pt in the bimetallic washcoats was kept constant at 1:1. Furthermore, non-doped and CeLa-doped catalysts were also tested to detect differences in catalyst activity. The catalysts consisting of two layers of washcoats were termed zoned catalysts and each layer was applied to some given length in the axial direction of the monolith. All catalysts were prepared by impregnation using the incipient wetness technique with δ-Al2O3 as support and deposited onto 400cpsi cordierite monoliths. A total of eight catalysts, including both single layered and zone-coated, were tested in a bench-scale reactor using low-sulfur diesel as fuel at operating conditions H2O/C=2.5, O2/C=0.49 (λ=0.33), GHSV=17,000h−1 and P=1atm. The results showed that the zoned catalyst, covered with the two washcoats Rh1.0Pt1.0–Ce10La5.0/δ-Al2O3 and Rh3.0–Ce10La10/δ-Al2O3, respectively, was most active in terms of fuel conversion and hydrogen production. The zoned catalyst's long-term performance and stability was also evaluated in a full-scale reactor using low-sulfur and Fischer–Tropsch diesels at operating conditions H2O/C=2.5, O2/C=0.49 (λ=0.33), GHSV=10,800h−1, P=1atm, and at H2O/C=2.4, O2/C=0.39 (λ=0.26), GHSV=10,200h−1, P=1atm, respectively. The results showed that high fuel conversion and hydrogen production were obtained from both fuels. In addition, partial oxidation and steam reforming reactions were identified by closely studying the distribution of the analyzed product gas composition and the temperature measurements. Fresh and aged samples of the catalysts were characterized by N2-BET, H2 chemisorption, XRD, H2-TPR, O2-TPO and XPS analyses.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
