Abstract The synthesis of highly selective catalysts for the catalytic fast pyrolysis (CFP) of biomass into valuable aromatics remains a challenge. This report describes the synthesis of hierarchical ZSM-5 catalysts by the NaOH desilication of conventional HZSM-5 for the CFP of rice straw to aromatics in a Tandem μ-reactor system coupled directly to a GC/MS equipped with FID and TCD. Catalysts were treated with a mild HCl wash and metal loading to increase the catalytic activity and reduce the deactivation. The effects of acidity, mesoporosity and incorporation of metals on the production of aromatics were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption and desorption (N2-BET) and temperature-programmed desorption of NH3 (NH3-TPD). The highest total acidity, especially the strong acidity, of the hierarchical ZSM-5 treated by 0.2 and 0.4 NaOH followed by HCl washing (AHZ-0.2 and AHZ-0.4) gave the highest yields of aromatics. Suitable mesopores introduced by alkali treatment enhanced mass transfer of reactants, increasing the yield of aromatics. Finally, the loading of a suitable amount of Ni and Cu produced more aromatics than standard HZSM-5 due to the improved decarboxylation/decarbonylation reactions leading to higher yields of olefins.

中文翻译：

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碱处理和金属改性制备的多级HZSM-5催化稻草快速热解芳香族化合物

摘要 用于将生物质催化快速热解 (CFP) 合成有价值的芳烃的高选择性催化剂仍然是一个挑战。本报告描述了通过传统 HZSM-5 的 NaOH 脱硅合成分级 ZSM-5 催化剂，用于在串联 μ-反应器系统中将稻草 CFP 转化为芳烃，该系统与配备 FID 和 TCD 的 GC/MS 直接耦合。催化剂用温和的 HCl 洗涤和金属负载处理，以增加催化活性并减少失活。通过 X 射线衍射 (XRD)、透射电子显微镜 (TEM)、N2 吸附和解吸 (N2-BET) 和 NH3 的程序升温解吸研究了酸度、介孔率和金属掺入对芳烃生成的影响。 NH3-TPD）。总酸度最高，尤其是强酸度，用 0.2 和 0.4 NaOH 处理，然后用 HCl 洗涤（AHZ-0.2 和 AHZ-0.4）处理的分级 ZSM-5 得到最高的芳烃收率。通过碱处理引入的合适的介孔增强了反应物的传质，提高了芳烃的产率。最后，由于改进的脱羧/脱羰反应导致更高的烯烃产率，加载适量的 Ni 和 Cu 比标准 HZSM-5 产生更多的芳烃。