Direct Observation of Pyrolysis Behavior of Carbonaceous Solids in a Hot Steam-Argon Environment

摘要

A unique flame-pyrolysis, direct-sampling mass spectrometer system has been applied to the observation of the primary and secondary pyrolysis of wood and its constituents. The system consists of a flat-flame burner which generates a hot column of steam-argon, into which samples to be pyrolyzed are introduced or suspended. A free-jet, molecular-beam, mass spectrometric sampling system is positioned relative to the pyrolyzing surface so that primary products can be observed as well as their secondary cracking in hot gases. Typical primary pyrolysis product slates from cellulose, lignin, hemicellulose, wood, oil shale and coal will be shown, as well as the secondary cracking of cellulose products to olefins. The effect of potassium ions and sample dimension on primary pyrolysis of cellulose will be shown to illustrate the kind of real-time pyrolysis behavior that can readily be observed with our techniques. (ERA citation 07:049629)