School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea.
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea.
Bioresour Technol. 2020 Nov;315:123835. doi: 10.1016/j.biortech.2020.123835. Epub 2020 Jul 15.
The present study examined the effects of the pyrolysis environment on BTEX (benzene, toluene, ethylbenzene, and xylenes) production in the catalytic upgrading of yellow poplar pyrolysis vapors. Three different gas environments, N, CH, and pre-decomposed CH stream (10 wt%-Ni/5 wt%-LaO-5 wt% CeO-AlO), which is a mixture of H (55.62%) and CH, were studied using two types of zeolite catalysts, HZSM-5, and 1 wt% Ga/HZSM-5. The BTEX yields were enhanced linearly in the order N < CH < CH ex-situ decomposition. The highest BTEX yield of 9.58 wt% was obtained under the CH ex-situ decomposition environment over 1 wt% Ga/HZSM-5. The methane and hydrocarbons derived from biomass were activated on highly dispersed (GaO) sites and transformed smoothly to BTEX by aromatization on the BrØnsted acid sites of Ga/HZSM-5. The hydrogen produced from methane decomposition also assisted in aromatics production through the hydrodeoxygenation of methoxyphenols, guaiacols and catechols.
本研究考察了热解环境对黄杨热解蒸汽催化升级过程中苯、甲苯、乙苯和二甲苯（BTEX）生成的影响。使用两种沸石催化剂，HZSM-5 和 1wt%Ga/HZSM-5，研究了三种不同的气体环境，N、CH 和预分解 CH 流（55.62%H 和 44.38%CH 的混合物）。BTEX 的产率按 N < CH < CH 原位分解的顺序呈线性增加。在 1wt%Ga/HZSM-5 上，在 CH 原位分解环境下，BTEX 的产率最高，达到 9.58wt%。生物质衍生的甲烷和碳氢化合物在高度分散的 (GaO) 位上被活化，并通过 Ga/HZSM-5 的 BrØnsted 酸位上的芳构化顺利转化为 BTEX。来自甲烷分解的氢气也通过甲氧基苯酚、愈创木酚和儿茶酚的加氢脱氧作用，有助于芳烃的生成。
