Wet air oxidation of acetic acid over platinum catalysts supported on cerium-based materials: Influence of metal and oxide crystallite size

Mikulová, J.; Barbier, J.; Rossignol, Sylvie; Mesnard, D.; Duprez, Daniel; Kappenstein, Charles

doi:10.1016/j.jcat.2007.07.008

Cited by 55 publications

(46 citation statements)

References 41 publications

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“…The difference between the oxygen uptake values is more pronounced when the Co-loaded samples is compared, suggesting a role for Co in facilitating oxygen mobility within the support. A similar phenomenon has been previously reported over noble-metal samples [59][60][61][62]. In fact, the quantification of the results shows that part of the oxygen uptake for the ceria-supported samples is attributable to the support.…”

Section: The Effect Of Support Modification With Ceo 2 On Catalytic Psupporting

confidence: 87%

Final Report for "Investigation of reaction networks and active sites in bio-ethanol steam reforming over Co-based catalysts" with all publications attached.

Ozkan¹

2011

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Executive SummaryThis was a university-based research project in support of distributed reforming production technologies for hydrogen. Our objective was to examine the steam reforming of bio-ethanol and other related bio-derived liquids over non-precious metal catalyst systems to enable small-scale distributed hydrogen production technologies from renewable sources. The study targeted development of a catalytic system that does not rely on precious metals and that can be active in the 350-550°C temperature range, with high selectivity and high stability. To this end, we adopted a multi-prong research strategy, that included catalyst formulation and synthesis, detailed catalyst characterization, reaction kinetics and reaction engineering, molecular modeling and economic analysis studies. Our approach was an iterative one, where the knowledge gained in one aspect of the study was utilized to modify and fine-tune catalyst development.The research addressed many fundamental and inter-related phenomena involved in the catalytic steam reforming of ethanol that may not be readily studied in an industrial development setting.The outcome of the project was a catalytic system that was able to meet the DOE targets in hydrogen production, with high H 2 yield, high selectivity and stability that could perform efficiently in the 350-550°C temperature range. In addition, we were able to answer many fundamental questions about the catalytic systems that could easily be translated to other catalytic systems. The study resulted in 14 refereed journal articles, with one more in preparation. The results were also shared broadly at many different national and international forums such as conferences of the American Chemical Society, American Institute of Chemical Engineers, North American Catalysis Society, International Congress on Catalysis and International Conference on Catalysis for Renewable Sources. There were 30 presentations given at various national and international meetings. The P.I. was also invited to give 11 lectures on the findings from this study at many universities and research centers in the USA and other countries. The knowledge base acquired through this study is expected to bring industry closer to designing catalytic systems that can be tailored for the specific hydrogen production applications, especially for distributed hydrogen production strategies. DE-FG36-05GO15033 March 2011, The Ohio State UniversityPage 3 of 18 A comparison of the Actual Accomplishments with the Objectives of the ProjectAt the beginning of the project, the following questions were formulated as key phenomena to address for the success of the project:• How do the catalyst synthesis methods affect oxidation state, structure, metal dispersion, and particle size?• What oxidation states and chemical structures are present in catalysts in prereaction, post-reaction and steady-state reaction stages?• How do the catalyst structure and characteristics influence the reaction pathways?• What is the role of support?• How can the catalyst surfac...

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Section: The Effect Of Support Modification With Ceo 2 On Catalytic Psupporting

confidence: 87%

Final Report for "Investigation of reaction networks and active sites in bio-ethanol steam reforming over Co-based catalysts" with all publications attached.

Ozkan¹

2011

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“…This could be due to the sintering of CeO 2 during calcination of the catalyst at 650°C. The addition of Zr to the CeO 2 prevents any agglomeration during heat treatment because the structure of the Ce-Zr mixed oxide is more thermally stable [21].…”

Section: X-ray Diffraction and Specific Surface Areamentioning

confidence: 99%

“…Numerous heterogeneous catalysts such as activated carbon, CeO 2 , TiO 2 , MnO 2 , ZrO 2 and their mixed oxides [12][13][14][15][16][17][18] have been tested in the CWAO of phenol, acetic acid and industrial effluents. Moreover, noble metals (Pt, Ru, Pd) supported on mixed oxides have been found to be the most efficient catalysts in CWAO of different effluents than pure metal oxides [19][20][21]. However, noble metals are rather high cost materials and therefore less expensive alternatives should be identified.…”

Section: Introductionmentioning

confidence: 99%

Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

Heponiemi

Azalim

et al. 2015

Top Catal

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Catalytic wet air oxidation of an aqueous solution, bisphenol A (BPA), was carried out at 160°C and at 20 bar of air in a batch reactor. Silver catalysts (2.5 wt%) prepared by wet impregnation and complexation on commercial CeO 2 in addition to Ce 0.85 Zr 0.15 O 2 and Ce 0.2 Zr 0.8 O 2 sol-gel mixed oxides were synthesized and used as catalysts in the reaction. Characterizations of the catalysts were performed by using FESEM, XRD, BET, XPS and ICP-OES techniques. Residual BPA concentration was analyzed by using an UV-Vis technique and organic compound content was measured via the total organic carbon method. Commercial CeO 2 showed a smaller specific surface area and a larger crystallite size than laboratory prepared Ce-Zr mixed oxides. The highest BPA removal (76 %) was achieved after 3 h with CeO 2 , Ce 0.85 Zr 0.15 O 2 and Ag/Ce 0.85 Zr 0.15 O 2 catalysts revealing that the addition of silver had no effect on the catalytic activity of the pure supports. However, the loading of active metal to the supports by complexation decreased the adsorption of the BPA during the heating period and hence the Ag/Ce 0.85 Zr 0.15 O 2 prepared via complexation was the most active catalyst with only 1 % adsorption of BPA. Moreover, the activity of the catalysts was not related to the surface area of the samples. According to the ICP-OES analysis of the terminal water samples, leaching of the silver was occurred during oxidation experiments explaining the behavior of Ag catalysts in the reaction.

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“…Oxygen uptake was 292 molO 2 /g for the pure support and 688 mol O 2 /g for the Ir/Ce 0.75 Zr 0.25 O 2 catalyst. In fact, Ce x Zr 1−x O 2 is known to possess an intrinsically high OSC, and the addition of noble metals could promote this property significantly [34,35]. This capacity is associated to the storage/release of oxygen via the Ce 4+ /Ce 3+ redox cycle.…”

Section: Characteristics Of the Catalystmentioning

confidence: 99%

Hydrogen production from propane steam reforming over Ir/Ce 0.75 Zr 0.25 O 2 catalyst

Hou

Zhang

et al. 2015

Applied Catalysis B: Environmental

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Wet air oxidation of acetic acid over platinum catalysts supported on cerium-based materials: Influence of metal and oxide crystallite size

Cited by 55 publications

References 41 publications

Final Report for "Investigation of reaction networks and active sites in bio-ethanol steam reforming over Co-based catalysts" with all publications attached.

Final Report for "Investigation of reaction networks and active sites in bio-ethanol steam reforming over Co-based catalysts" with all publications attached.

Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

Hydrogen production from propane steam reforming over Ir/Ce 0.75 Zr 0.25 O 2 catalyst

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