APCATA 527-2016-161

Hydrogen production from catalytic steam reforming of phenol withbimetallic nickel-cobalt catalyst on various supports

Catalytic phenol steam reforming with the aim of hydrogen production was studied in terms of bimetallicnickel-cobalt supported by CeO2, ZrO2, La2O3, -Al2O3, and -Al2O3. The catalysts (each formed of 5% wt.of nickel and 5% wt. of cobalt on the support) were prepared according to the impregnation method.The effect of different supports on the properties and catalytic behaviour with the aim of hydrogenproduction, phenol conversion, and coke formation on the surface of the catalysts were studied. Thephysical and chemical properties of the catalysts were characterised in terms of their surface area, acidity,basicity, reducibility, crystallinity, and coke formation (for spent catalysts). The catalysts were tested byusing a micro-reactor fixed bed at a temperature range of 500–800◦C. The activity of the catalysts onphenol conversion and hydrogen yield depends on the basic and acidic site of the catalysts as well as themetal interaction with the support. Results of various experiments in catalytic activity confirmed thata higher production of H2occurred in the presence of high CO2uptake and H2consumption which arecharacterised by basicity and reducibility analysis respectively. The coke analysis results show that theirreducible oxides for the Ni-Co bimetallic catalyst are more favour for coke formation than reducibleoxides. All catalysts were active in the reformative reactions but the catalysts supported on the reducibleoxides of ZrO2showed superiority in activity and stability. The most active catalyst was Ni-Co/ZrO2because of having the tetragonal phase structure which is favour in reforming processes, strong metal-support interaction, high surface area, the lowest coke formation, and six days’ reformative stability. Thecatalyst test shows that the phenol conversion achieved at 650◦C is 75.9% and hydrogen yield is 80.7%for Ni-Co/ZrO2catalyst. The reaction rate and activation energy with respect to Ni-Co/ZrO2catalyst werefound to be 11.17 mmol/g s and 102.41 (J/mol), respectivel