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The following videos describe the thermal decomposition of cellulose on high temperature surfaces...

A particle of cellulose (300 microns diameter) lands on a high temperature (700 deg C) ceramic surface and decomposes to an intermediate liquid before fully volatilizing to gases and organic compounds.  The total duration of the video is about 200 milliseconds.
A particle of cellulose (300 microns diameter) lands on a high temperature (700 deg C) catalytic foam surface and decomposes to an intermediate liquid before fully volatilizing to gases and organic compounds.  The total duration of the video is about 200 milliseconds.
Multiple particles land on a high temperature (700 deg C) catalytic foam surface and decompose to an intermediate liquid before fully volatilizing to gases and organic compounds.  Air flows over the particles and reacts on the heterogeneous catalytic surface generating the heat necessary to maintain autothermal reaction conditions.

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