Catalytic steam reforming of olive mill wastewater for hydrogen production
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Catalytic honeycombs functionalized with lanthanum-stabilized ceria as catalytic support and impregnated with different metals (Rh, Ru, Pt, Pd and Ni) were prepared and tested for hydrogen production through the steam reforming of distillated, three-phase olive mill wastewater (OMW). Tests were carried out at atmospheric pressure, different temperatures (873-1023 K), and space velocities (4500-16,000 h(-1)) over catalytic honeycombs loaded with ca. 3 mg cm(-2) of catalyst. The catalytic performance was evaluated in terms of hydrogen production, selectivity of gaseous products and stability for 24 h. The best results were obtained over Pt- and Rh-based catalytic systems. Chemical oxygen demand values were determined to quantify the total organic content of OMW and post-reaction condensate to quantify the extension of the reaction. Total organic contents were found to be 5.4 mg L-1 and 0.2-0.5 mg L-1 in OMW distillate and post-reaction condensate, respectively, which leads to a 90-96 % of organic content removal during the steam reforming process. Up to 40 STP mL of pure hydrogen per mL of distillated olive mill wastewater were produced over Pt/CeLa at 973 K and 16,000 h(-1). X-ray photoelectron spectroscopy analyses revealed carbon and calcium deposition during catalytic reaction. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
CitationCasanovas, A., Galvis, A., Llorca, J. Catalytic steam reforming of olive mill wastewater for hydrogen production. "International journal of hydrogen energy", 29 Juny 2015, vol. 40, núm. 24, p. 7539-7545.