基于Py-GC-MS的杨木和松木快速热解比较研究

Comparison of Fast Pyrolysis of Poplar and Pine Woods on the Basis of Py-GC-MS Analysis

以杨木(典型阔叶木)和松木(典型针叶木)为原料,采用快速热解-气相色谱-质谱联用(Py-GC-MS)技术进行实验研究,考察两者化学组成的差别对快速热解产物分布的影响。结果表明,两种原料木质素的差别决定了松木热解产物中不含紫丁香酚类物质;杨木由于半纤维素的乙酰化程度高于松木,导致其热解形成的酸类产物的GC含量高达11.22%,而松木的酸类产物的GC含量仅为4.28%;此外,两种原料中少量的灰分对呋喃类和酚类产物没有显著影响,但能够显著抑制脱水糖类产物的生成,经脱灰预处理后,杨木和松木形成的脱水糖产物的GC含量分别增加了86.4%和52.4%。

Poplar wood （a typical hardwood） and pine wood （a typical softwood） were pyrolyzed using the pyrolysis-gas chromatography-mass spectrometry （Py-GC-MS） technique.The difference of components during fast pyrolysis reaction was investigated.The results indicated that due to the ligain composition difference of these two woods,the pyrolytic products from the pine wood did not contain syringol-typo phenolics.Since the hemicellulose in poplar has more acetylated formation than the hemicellulose in pine.The GC contents of the acid products from the poplar wood reached 11.22％,compared with only 4.28％of the acid products from the pine wood.Moreover,the ash in these two woods had no great effects on the furans and phenolic products,but it would inhibit the formation of the anhydrosugars remarkably.After the demineralization pretreatment,the GC contents of the anhydrosugars from the poplar and pine woods increased by 86.4％ and 52.4％,respectively.