Williams P T, Brindle A J
Department of Fuel and Energy, The University of Leeds, Leeds, LS2 9JT, UK.
Environ Technol. 2003 Jul;24(7):921-9. doi: 10.1080/09593330309385629.
Pyrolysis of scrap tyres was undertaken in a semi-continuous fluidised bed reactor in relation to the temperature of the fluidised bed. Subsequently, a fixed bed of Zeolite catalyst was placed in the freeboard of the reactor. The catalyst temperature was held constant at 500 degrees C and the influence of the temperature of the fluidised bed over the same temperature range as the uncatalysed pyrolysis examined. Two Zeolite catalysts were examined, a Y-type Zeolite catalyst and Zeolite ZSM-5 catalyst of differing pore size and surface activity. The main aim of the work was to examine the production of certain single ring aromatic compounds in the derived pyrolysis oil which are known to be of commercial value. The oils were therefore analysed in detail to determine the concentration of benzene, toluene, xylenes and limonene. In addition, detailed analyses of the derived gases under pyrolysis and catalytic pyrolysis conditions were determined. The influence of the temperature of pyrolysis was to increase the yield of benzene, toluene and xylenes but decrease the yield of limonene. In the presence of the catalyst, the yield of oil was reduced with a consequent increase in the gas yield. Benzene, toluene and xylenes present in the oils showed a significant increase in the presence of both of the catalysts. The two catalysts used, although of differing surface acidities and selective pore sizes, produced similar concentrations of benzene, toluene, xylene and limonene.
在半连续流化床反应器中，针对流化床温度进行了废旧轮胎的热解实验。随后，在反应器的自由空间放置了一个沸石催化剂固定床。催化剂温度保持在500摄氏度不变，并考察了在与未催化热解相同温度范围内流化床温度的影响。研究了两种沸石催化剂，一种是Y型沸石催化剂，另一种是孔径和表面活性不同的ZSM-5沸石催化剂。这项工作的主要目的是研究热解油中某些已知具有商业价值的单环芳烃化合物的生成情况。因此，对热解油进行了详细分析，以确定苯、甲苯、二甲苯和柠檬烯的浓度。此外，还测定了热解和催化热解条件下衍生气体的详细分析结果。热解温度的影响是提高苯、甲苯和二甲苯的产率，但降低柠檬烯的产率。在催化剂存在的情况下，油的产率降低，气体产率相应增加。油中存在的苯、甲苯和二甲苯在两种催化剂存在下均显著增加。所使用的两种催化剂虽然表面酸度和选择性孔径不同，但产生的苯、甲苯、二甲苯和柠檬烯浓度相似。
