STUDY ON CHITIN PYROLYSIS CHARACTERISTICS BY CALCIUM-NICKEL BASED MONO/BIMATALLIC CATALYSTS
In this paper,chitin was used as a biomass simulant,and thermogravimetric mass spectrometry was applied to study the hydrogen and NH3 release characteristics of calcium-based mono-and bimetallic catalytic pyrolysis.When Fe was added,the specific surface area,average pore diameter,and pore volume were 309.01％,11.61％,and 100％higher than that of the Ni monometallic catalyst,respectively,which is beneficial for improving the contact effect between the syngas and catalysts.In addition,the order of catalytic pyrolysis from easy to difficult is Ni、Fe、FeCu and CuNi、Cu、FeNi,meanwhile,the sequence of catalytic hydrogen production improvement is Ni、CuNi、FeNi、Cu、FeCu、Fe.The catalytic hydrogen production of Ni is the best,and the peak value is 0.5943 mmol/(g·min).Should be noted that,high temperature is not conducive to the activity of Ni-based catalysts.Ni and Cu mono-metallic catalysts increases the peak of NH3 by 94.17％and 72.96％,respectively.Further,the raising of pyrolysis temperature is beneficial for the release of NH3.It is suggested that the catalytic pyrolysis temperature should not exceed 600℃ to control the release of NH3.This study can provide theoretical guidance for the preparation of high-grade clean syngas through the catalytic pyrolysis of biomass.This study investigates the pyrolysis characteristics of biomass(chitin)catalyzed by calcium-based Ni,Cu,Fe and their bimetallic catalysts.Furthermore,the release characteristics of NH3 during the pyrolysis process is obtained.
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