木材经催化热分解向BTX和合成燃料的转化

CONVERSION OF PLANT-BIOMASS TO BTX AND SYNTHETIC FUELS BY CATALYTIC PYROLYSIS

以废木材生物质的有效利用为目的 ,使用粉粒流化床反应器 ,对 3种木材进行了催化热分解实验 ,以 4种催化效果不同的粒子作为流化床内的流化介质来考察催化热分解过程中介质颗粒、反应气体和热分解温度对产物分布的影响 .木材的挥发性物质在 70 0K时就已几乎分解出来 ,挥发性物质中的轻质芳香烃碳氢化合物(苯、甲苯、二甲苯和萘 :BTXN)的收率随着热分解温度的升高而增加 ,1173K下达到 3 1% (质量分数 ) ,daf.在氢气气氛下 ,当作为流化介质颗粒Zn (3% ,质量分数 ) /HZSM 5催化剂对木材进行催化热分解时 ,85 3K下可得到 6 1% ,daf的轻质芳香烃碳氢化合物的收率 (BTX 5 5 % ,daf、萘 0 6 % ,daf) .而在活性很高的Ni Mo A加氢催化剂下 ,在 86 3K时 。

Catalytic pyrolysis of biomass materials was carried out by powder particle fluidized bed (PPFB). Three kinds of wood-chips were used in the experiment. Four kinds of catalyst particles were used as bed medium particles and the effect of catalyst on pyrolysis products was investigated. It was found that in the primary pyrolysis of wood, most of the volatile matter was volatilzed at a temperature of 700 K and yields of light aromatic hydrocarbons, i.e., benzene, xylene, toluene and naphthalene (BTXN) , increased with an increasing pyrolysis temperature. BTXN yield reached 3.1% (mass), daf at a temperature of 1173 K. When wood-chip was pyrolyzed in a fluidized bed of Zn (3%, mass) /HZSM-5 particles under a hydrogen atmosphere, BTXN yield of 6.1% (mass), daf [BTX: 5.5% (mass), daf, N: 0.6% (mass), daf] was obtained at 853 K. For the ease with the NiMo-A, catalyst the pyrolysis products were almost methane, because its hydrogenation activity is very high.