三水磷酸钾耦合CaO对樟木粉热解特性及NOx前体释放特性的影响

利用生物质催化热解生产高附加值化学品具有广阔的应用前景，但热解过程中排放的NO_x会对环境造成不利影响。本文利用热重-质谱联用技术（TG-MS）探究樟木粉热解特性及热解过程中主要NO_x前体的释放特性，对比分析CaO耦合磷酸盐对樟木粉热解过程中NO_x前体生成的反应过程的影响。实验结果显示，随着三水磷酸钾和CaO的加入，樟木粉热解过程中挥发性产物的释放量有所增加而固相产物的产率有所减少；同时，混合热解过程中生成的主要NO_x前体的离子流强度曲线有所降低。这表明，三水磷酸钾和CaO的耦合作用，一方面能够改善樟木粉的热解特性，使热解过程更加彻底；另一方面能够有效抑制樟木粉中含氮化合物的一次裂解，延缓NH₃等NO_x前体的生成、减少HCN等NO_x前体的释放。

Interconnection effect of CaO and tripotassium phosphate trihydrate on the pyrolysis characteristics of camphor powder and the release of NOx precursor

Using the biomass to produce high value-added chemicals by catalytic pyrolysis has broad application prospects. But the emission of NO_x in pyrolysis process has adverse effect on the environment. The Thermogravimetric Analysis and Mass Spectrometry(TG-MS) were used to investigate the pyrolysis characteristics of camphor powder and the main characteristics of NO_x precursor release during pyrolysis,and the interconnection effect of CaO and phosphate on the formation of NO_x precursors during pyrolysis of camphor powder was studied. The experimental results showed that with the addition of CaO and tripotassium phosphate trihydrate,,the release of volatile products increased while the yield of solid products decreased in the pyrolysis process of camphor wood powder;meanwhile,the ion flow intensity curve of the main NO_x precursors produced decreased during the mixed pyrolysis process. This showed that the interconnection effect of CaO and tripotassium phosphate trihydrate could improve the pyrolysis of camphor powder and make it more thoroughly; and the interconnection effect of CaO and tripotassium phosphate trihydrate could effectively restrain the first cleavage of nitrogen-compounds in the camphor powder,and indirectly reduce the production and release of HCN,HNCO,CH₃CN; the interconnection effect of CaO and tripotassium phosphate trihydrate could postpone producing NO_x precursors during pyrolysis of camphor powder.