Biomass is carbon-neutral and utilization of biomass as hydrogen resource shows no impact on atmospheric CO2 level. Nevertheless, a significant amount of CO2 is always produced in biomass gasification processes. If the CO2 produced can further react with biomass, then the biomass gasification coupled with CO2 reforming of biomass will result in a net decrease of CO2 level in atmosphere and produce the chemical raw material, syngas. To achieve this concept, a "Y" type reactor is developed and applied in bio-oil steam reforming, partial oxidation, or oxidative steam reforming coupled with CO2 reforming of bio-oil to eliminate the emission of CO2. The experimental results show that the reaction systems can efficiently suppress the emission of CO2 from various reforming processes. The different coupled reaction systems generate the syngas with different molar ratio of CO/H-2. In addition, coke deposition is encountered in the different reforming processes. Both catalysts and experimental parameters significantly affect the coke deposition. Ni/La2O3 catalyst shows much higher resistivity toward coke deposition than Ni/Al2O3 catalyst, while employing high reaction temperature is vital for elimination of coke deposition. Although the different coupled reaction systems show different characteristic in terms of product distribution and coke deposition, which all can serve as methods for storage of the carbon from fossil fuels or air. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.