Addition of tungsten in Co/Al₂O₃ to catalyse the production of hydrogen through acetic acid steam reforming

Abstract

Steam reforming of bio-oil is a promising green hydrogen production technology. Experimental and theoretical calculations have been carried out to study the performance of Co/ Al 2 O 3 catalysts doped with tungsten (1-10 wt%) for bio-oil model compound acetic acid steam reforming. The maximum acetic acid conversion of 95.4 % and H 2 yield of 93.5 % were obtained over the 15Co-5W/Al 2 O 3 catalyst under the optimized reaction conditions of temperature = 550 °C, steam to carbon ratio = 5 and the gas hourly space velocity of 15,780 h À 1 . The feeding capacity of the catalyst was improved by 2.3 times by the addition of 5 wt% W compared to that of the non-W-added Co/Al 2 O 3 catalyst. Catalyst characterizations by BET, XRD, H 2 -TPR, XPS, HRTEM, and SEM were performed. The results showed that high activities were maintained over 20 h on the 15Co-5W/ Al 2 O 3 catalyst. A little filamentous coke was formed on the spent catalyst surface, and the agglomeration rate of active Co was relatively low. Density functional theory calculations confirmed that the adsorptions of CH 3 COOH and H 2 O on the catalyst were enhanced by the addition of W.

Investigation of Drug Release Behavior of Cyclomatrix Polyphosphazene Microparticles Decorated with Gold and Silver Nanoparticles

“…For this reason, synthesis in the presence of any support material or stabilizing agent is generally preferred to preserve nanoscale properties. [8] Inorganic oxides, [9,10] fly-ash particles, [11] polymeric particles, [12] hydrogels [13][14][15][16][17] and water-soluble polymers [18] can be counted among the materials that are frequently preferred as stabilizer/ support materials in the synthesis of metallic nanoparticles. The most common metallic nanoparticles in nanobiotechnology are gold and silver nanoparticles.…”