Abstract The effect of particle on the catalytic activity of HZSM-5 zeolite in organosolv lignin to phenols was investigated in the supercritical ethanol-water under the operating conditions of 350 °C and 4 h. Two samples comprising a micro and a nano size HZSM-5 were prepared by reflux and hydrothermal crystallization method, respectively. The catalyst samples were characterized with XRD, SEM, BET and NH3-TPD analytical techniques. The effect of crystal size on the lignin conversion to phenols and the structure changes of lignin residue were studied. The nano-HZSM-5 showed higher yield of phenols and lower yield of char as compared to the micro-HZSM-5. The enhanced content of aromatic C-C structures and extenuative content of aromatic C-O and C-H showed that intramolecular dehydration and deoxygenation were occurred with nano- and micro-HZSM-5, and the nano-HZSM-5 activity significantly stronger than micro-HZSM-5.

中文翻译：

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HZSM-5沸石粒径对有机溶剂木质素催化解聚苯酚的影响

摘要 在超临界乙醇-水中，在350 ℃和4 h的操作条件下，研究了颗粒对HZSM-5沸石在有机溶剂木质素中催化苯酚催化活性的影响。分别通过回流结晶法和水热结晶法制备了包含微米级和纳米级HZSM-5的两个样品。催化剂样品用XRD、SEM、BET和NH3-TPD分析技术表征。研究了晶体尺寸对木质素向酚类转化的影响以及木质素残基结构变化。与微米 HZSM-5 相比，纳米 HZSM-5 显示出更高的酚产率和更低的炭产率。芳香族CC结构的含量增加以及芳香族CO和CH的含量增加表明纳米和微米HZSM-5发生了分子内脱水和脱氧，