Co‐pyrolysis characteristics of soluble polysaccharides‐cellulose were investigated through thermogravimetric analysis (TGA), kinetic analysis, analytical pyrolyser coupled with gas chromatograph‐mass spectrometer (Py‐GC/MS) and subsequent density functional theory (DFT). Results from TGA and differential thermogravimetric analysis (DTG) analyses indicated that there were synergistic effects in the polysaccharides‐cellulose (PS‐CE) blends pyrolysis process. Surprisingly in co‐pyrolysis process from Py‐GC/MS analysis, the furans were suppressed, while the anhydrosugars were increased. The DFT calculation showed that free radicals pyrolyzed from soluble polysaccharides could suppress the ring‐opening reaction of D‐glucopyranose. The co‐pyrolyzed chemical compound distribution over the catalysts (MCM‐41, ZSM‐5 and their mixtures) was also detected through Py‐GC/MS analysis. Both the zeolites showed high selectivity for 5‐methyl‐2‐furaldehyde and 2‐furaldehyde. The two kinds of zeolites could induce the generation of furans but suppress the production of anhydrosugars, which was the opposite effect of the co‐pyrolysis of PS‐CE.

中文翻译：

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两种纤维素催化剂上多糖纤维素的共热解特性及共热解化合物的分布

通过热重分析（TGA），动力学分析，分析型热解仪结合气相色谱-质谱仪（Py-GC / MS）和随后的密度泛函理论（DFT）研究了可溶性多糖-纤维素的共热解特性。TGA和差示热重分析（DTG）分析的结果表明，多糖-纤维素（PS-CE）共混物的热解过程具有协同作用。令人惊讶的是，通过Py-GC / MS分析在共热解过程中，呋喃被抑制，而脱水糖增加。DFT计算表明，可溶性多糖热解的自由基可以抑制D-吡喃葡萄糖的开环反应。共热解化合物在催化剂上的分布（MCM-41，还通过Py-GC / MS分析检测到ZSM-5及其混合物。两种沸石均对5-甲基-2-糠醛和2-糠醛具有高选择性。两种沸石可以诱导呋喃生成，但抑制脱水糖的生成，这与PS-CE共热解的作用相反。