Catalytic Transformation Of Oxygenated Organic Compounds Into Pure Hydrogen

The development and application of energy is one of the important signs of the production technology and the living standard and the social development. The increasingly serious environmental problems cause the people to pay great attention to the clean energy. Hydrogen as a new type of energy has a wide range of applications, the environment friendly biomass energy is considered to be the best alternative to future fossil fuels in order to ensure the supply of energy demand in the future. This work demonstrated a proposed catalytic transformation of oxygenated organic compounds (related to bio-oil) into pure hydrogen, involving the catalytic reforming of oxygenated organic compounds to hydrogen-rich mixture gas followed by the conversion of CO to CO2 by the water gas reaction and the removal of CO2.The main content of present thesis was focused on the items as follows.1. Production ofpure hydrogen by catalytic reforming of oxygenated organic compoundsCatalytic reforming of bio oil model compound into hydrogen was performed with the nickel based catalysts in the fixed bed. The effects of reforming conditions, including reaction temperature, water carbon ratio, injection speed were investigated, the experimental study on production of pure hydrogen with the integrated process by coupling the reforming reaction, the water gas reaction and the removal of CO2 was conducted.Results showed that when TSR=650℃, TWGS=250℃, After the CO2 adsorption treatment,99.96 vol% of high purity hydrogen can be obtained.2. Comparison of production hydrogen from different model compoundsTo gain insight on the differences of the catalytic reforming reactions among different types of compounds, we performed the following comparative experiments using acetic acid, methanol, formaldehyde, acetone, glucose, furan and phenol as the selected model compounds.The the conversion and hydrogen yields obtained from the tested feed stocks were lined up as follows:methanol>acetone> formaldehyde> acetic acid> glucose> furan> phenol.Methanol has the highest low-temperature reforming reactivity for the production of hydrogen, phenol and furan have the lower reforming reactivity at the low-temperature region, corresponding to lower conversion and lower H2 yield, This may be attributed to the high molecular structure stability of aromatic and ring compounds, and thereby, the breaking of the C-C bond in these compounds need to higher reaction temperatures.1. Preparation of hydrogen by catalytic reforming of bio oil High purity hydrogen can be obtained with the integrated process by coupling the reforming reaction, the water gas reaction from bio oil. The conversion and the hydrogen yields as well as the gas product distribution is infiuenced by reaction temperature, water carbon ratio, injection speed. Distilled oil is most likely to be reformed, which is because the distillation of oil contains a lot of volatile small molecules, the most difficult to be re heavy oil, because heavy oil contains more phenolic substances.