The gases and chars produced during fast pyrolysis of maize stalk, rice straw, cotton straw and rice husk at temperatures ranging from 600 to 1000°C were studied by Fourier transform infrared spectroscopy, non-dispersive infrared technique, thermal conductivity detection method, ultimate analysis, X-ray diffraction, helium density measurement and N(2) adsorption method. The gas yield increased by more than 80% from 600 to 1000°C, while the char and liquid yield decreased. The content of CO(2), CO and CH(4) accounted for more than 86%. The CO and CH(4) content increased with temperature, while the CO(2) content decreased. The hydroxyl, aliphatic CH, carbonyl, olefinic CC and ether groups were lost above 800°C. Carbon skeleton shrinkage increased by more than 23% when the temperature increased from 600 to 1000°C. Maximum porosity appeared at 900°C. This study revealed the relationships between gas composition/char properties and pyrolysis temperature under high heating rate conditions.
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