Influence of pressure on the gasification kinetics of two high-temperature beech wood chars with CO2, H2O and its mixture

• Experimental data and modeling for CO 2 , H O mixed gasification at high pressure. Beech wood chars produced in drop-tube reactor 1400 °C 1600 200 ms. Gasification single-particle with forced flow-through conditions. Interpretation of results based on graphitization, ash dispersion morphology. This paper presents experimental approaches to describe the influence partial pressure as well absolute kinetics two different beech chars. The were (P1400) (P1600) high-heating rates short residence times a reactor. experiments conducted conditions reducing diffusional effects minimum. interpretation experimentally determined reaction during its mixture is char properties (graphitization, morphology) presented previous publication. During P1600 shows higher reactivity compared P1400 all pressures temperatures applied. may be explained by CaO film surface catalyzing char-CO reaction. On other hand, towards which evoked lower graphitization degree specific area. Reaction kinetic single atmosphere was successfully carried out using power law approach. Langmuir-Hinshelwood model, however, only gave good where possible saturation observed. Increasing /H atmospheres leads both rate r mix can expressed addition low area suggesting separate active site mechanism. Catalytic activity increases distinctively pressures. For pressures, stagnates due degree. Here, common sites mechanism assumed.