Abstract
Alumina-supported bimetallic cobalt-nickel catalyst has been prepared and employed in a fixed-bed reactor for the direct production of synthesis gas from glycerol steam reforming. Physicochemical properties of the 5Co-10Ni/85Al2O3 catalyst were determined from N2-physisorption, H2-chemisorption, CO2 and NH3-temperature-programmed desorption measurements as well as X-ray diffraction analysis. Both weak and strong acid sites are present on the catalyst surface. The acidic:basic ratio is about 7. Carbon deposition was evident at 923 K; addition of H2 however has managed to reduce the carbon deposition. Significantly, this has resulted in the increment of CH4 formation rate, consistent with the increased carbon gasification and methanation. Carbon deposition was almost non-existent, particularly at 1023 K. In addition, the inclusion of hydrogen also has contributed to the decrease of CO2 and increase of CO formation rates. This was attributed to the reverse water-gas-shift reaction. Overall, both the CO2:CO and CO2:CH4 ratios decrease with the hydrogen partial pressure.
Highlights
The use of renewable feedstock is fast gaining attention in lieu of the context of securing sustainable use of energy and preserving the environment for the future generations
Carbon deposition is a perennial issue during glycerol steam reforming
Cheng et al [3] have reported a kinetic study of carbon deposition during glycerol steam reforming over alumina supported bimetallic Co-Ni catalyst
Summary
The use of renewable feedstock is fast gaining attention in lieu of the context of securing sustainable use of energy and preserving the environment for the future generations. Glycerol, known as 1,2,3-propanetriol, is produced in excess quantity in the form of by-product during biodiesel synthesis. It constitutes an approximately 10wt% of the total product. In an effort to add value to glycerol as precursor for renewable and clean energy production, it was steam-reformed at temperatures greater than 773 K to produce H2, CO and CO2 which are important ingredients for the manufacture of a variety of industrial chemicals [1,2]. Carbon deposition is a perennial issue during glycerol steam reforming. Cheng et al [3] have reported a kinetic study of carbon deposition during glycerol steam reforming over alumina supported bimetallic Co-Ni catalyst. Results on the effects of H2 addition towards carbon deposition and product variation will be presented and elucidated in detailed
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