Abstract The present study proposes biomass torrefaction combined with catalytic pyrolysis to simplify the liquid products and selectively generate aromatic hydrocarbons. Cedarwood was selected as the representative biomass sample. The torrefaction of cedarwood at 250oC and 300°C (TB250 and TB300) was carried out to determine the solid product yield and its composition. It was shown that TB250 yielded the highest lignin feedstock and the yield of acetic acid was decreased to 1.88 %. Different transition metals (Ni/Cr) and Mo2N modified HZSM-5 catalysts with different Si/Al ratios were prepared for catalytic pyrolysis. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to evaluate the effects of several factors on the final aromatic hydrocarbons yields. The results indicated that with a pyrolysis temperature of 700°C, a catalyst-to-biomass ratio of 5, and 5% Ni-Mo2N/HZSM-5 (Si/Al ratio of 25) catalyzed, the yields of benzene, toluene and xylene could be increased to 2.10 %, 3.94 % and 5.54 %, respectively. Resulting from the excellent reduction ability of the modified catalyst, the yields of naphthalene and methylnaphthalene were reduced to 2.58 % and 0.70 %, respectively.

中文翻译：

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改性HZSM-5催化快速热解生物质促进单环芳烃

摘要 本研究提出生物质烘焙与催化热解相结合，以简化液体产品并选择性地生成芳烃。选择雪松作为代表性的生物质样品。在 250oC 和 300oC（TB250 和 TB300）下对雪松进行烘焙以确定固体产物的产率及其组成。结果表明，TB250 产生最高的木质素原料，乙酸的产率降至 1.88%。制备了具有不同 Si/Al 比的不同过渡金属 (Ni/Cr) 和 Mo2N 改性的 HZSM-5 催化剂用于催化热解。进行热解-气相色谱/质谱 (Py-GC/MS) 实验以评估几个因素对最终芳烃产率的影响。结果表明，在 700°C 的热解温度、5 的催化剂生物质比和 5% Ni-Mo2N/HZSM-5（Si/Al 比为 25）催化下，苯、甲苯和二甲苯可以分别增加到 2.10%、3.94% 和 5.54%。由于改性催化剂优异的还原能力，萘和甲基萘的产率分别降低到2.58%和0.70%。