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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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DOI

10.1002/chin.199630146

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ISSN

1588-2926

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TGFTIR Pytwodimensional GC–MS with heartcutti

Authors: Jufang Hao Jizhao Guo Li Ding Fuwei Xie Qiaoling Xia Jianping Xie
Publish Date: 2013/05/21
Volume: 115, Issue: 1, Pages: 667-673
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Abstract

To elucidate the formation process of HCN from the pyrolysis of glycine the small molecule gaseous pyrolysates H2O NH3 CO2 CO HNCO and HCN were analyzed in realtime by TGFTIR The appearance of the volatile pyrolysis products and the solid residue was determined in realtime at their corresponding formation temperatures by online Pytwodimensional GC–MS with heartcutting and LC–MS/MS The pyrolysis of 25diketopiperazine a thermolytic byproduct of glycine pyrolysis was also studied The results showed that 1 the pyrolysis of glycine can be divided into three temperature ranges 200–300 300–440 and 440–900 °C HCN forms in each range with three peaks appearing at 273 422 and 763 °C respectively 2 The mechanistic pathways of HCN formation from glycine in the low and hightemperature heating stages are different Below 273 °C glycine undergoes a decarboxylation reaction to produce methylamine which subsequently forms HCN by means of dehydrogenation Above 300 °C glycine gives relatively large amounts of HCN via 25diketopiperazine and subsequent HNCO or methylenimine formation

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