Production of aromatic compounds from catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5 prepared by ion-exchange and impregnation methods.
Production of aromatic compounds from catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5 prepared by ion-exchange and impregnation methods.
复制标题
DOI：
10.1016/j.renene.2014.10.013
复制
发表时间：
2013-11
期刊：
影响因子：
8.7
通讯作者：
S. Vichaphund;D. Aht-Ong;V. Sricharoenchaikul;D. Atong
中科院分区：
文献类型：
--
作者：
S. Vichaphund;D. Aht-Ong;V. Sricharoenchaikul;D. Atong
采用离子交换法和浸渍法制备了金属基分子筛催化剂。采用水热法在160 ° C合成的HZSM-5作为载体负载Co、Ni、Mo、Ga和Pd等金属。金属/HZSM-5具有530 - 677m2/g和22.9 - 26.0 μ m的表面积和孔径。在500 ° C下，采用分析热解-GC/MS研究了金属/HZSM-5催化剂对麻风树残渣的非催化快速热解和催化快速热解。非催化热解蒸气主要含有高水平的酸（50.7%）、含氮化合物（20.3%）、其他含氧化合物（包括酮、醇、酯、醚、酚和糖）（25.0%），同时产生3.0%和1.0%的少量芳族和脂族烃。合成的金属/HZSM-5的加入提高了芳烃选择性高达91 - 97%，并减少了不期望的含氧化合物（0.6 - 4.0%）和含氮化合物（1.8 - 4.6%）。金属离子交换催化剂的芳烃选择性略高于浸渍催化剂。在高催化剂含量（生物质与催化剂的比例为1：10）下，Mo/HZSM-5显示出对于离子交换催化剂的最高芳族选择性为97%，Ga/HZSM-5显示出对于浸渍催化剂的最高芳族选择性为95%。芳香族化合物的形成有利于提高生物油的热值。两种制备方法的金属/HZSM-5的存在大大提高了包括苯、甲苯和二甲苯（BTX）在内的MAH的选择性，同时大幅降低了不利的多环芳烃如萘。
Metal based-zeolite catalysts were successfully prepared by two different methods including ion-exchange and wet impregnation. HZSM-5 synthesized by hydrothermal method at 160 °C was used as a support for loading metals including Co, Ni, Mo, Ga and Pd. The metal/HZSM-5 had surface area and pore size of 530–677 m2/g and 22.9-26.0 Å. Non- and catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5 were studied using an analytical pyrolysis-GC/MS at 500 °C. Non-catalytic pyrolysis vapors contained primarily high levels acid (50.7%), N-containing compounds (20.3%), other oxygenated compounds including ketones, alcohols, esters, ethers, phenols and sugars (25.0%), while generated small amount of aromatic and aliphatic hydrocarbons of 3.0% and 1.0%. The addition of synthesized metal/HZSM-5 improved the aromatic selectivity up to 91–97% and decreased the undesirable oxygenated (0.6–4.0%) and N-containing compounds (1.8–4.6%). The aromatic selectivity produced by metal-ion exchanged catalysts was slightly higher than that produced by impregnated ones. At high catalyst content (biomass to catalyst ratio of 1:10), Mo/HZSM-5 showed the highest aromatic selectivity of 97% for ion-exchanged catalysts and Ga/HZSM-5 revealed the highest aromatics of 95% for impregnated catalysts. The formation of aromatic compounds could be beneficial to improve calorific values of bio-oils. The presence of metal/HZSM-5 from both preparation methods greatly enhanced MAHs selectivity including benzene, toluene, and xylene (BTX), while substantially reduced unfavorable PAHs such as napthalenes.