Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, Ibaraki, Japan.
Chemosphere. 2010 Jan;78(5):599-603. doi: 10.1016/j.chemosphere.2009.11.031.
To control of hydrocarbon content in waste pyrolysis-gasification and reforming processes, the use of a hydrogenation catalyst was examined in a test system with a model gas. To reduce the concentration of benzene in the reforming gas, benzene was hydrogenated with a nickel catalyst. The catalyst is usually used to convert gas-phase unsaturated hydrocarbons to saturated hydrocarbons, and the benzene was converted to cyclohexane at a temperature range of about 130 to 180 degrees C in the presence of steam. However, the conversion to methane occurred at about 250 to 300 degrees C. Methane seems to be a useful conversion compound because it does not cohere as a light tar. Sometimes the reforming gas needs to be cooled for use as generator fuel. In this case, it is possible to avoid the tar cohesion if the benzene in the gas is converted to methane at about 300 degrees C after the reforming. Reduction of the efficiency of conversion to methane was not observed over a 60h reaction period. The lower hydrocarbons (ethylene, ethane, and propylene) were also converted to methane at about 300 degrees C. Conversion of benzene was also possible when other hydrocarbons were present at high concentrations.
为了控制废热解气化和重整过程中的碳氢化合物含量，在一个模型气体的测试系统中检查了氢化催化剂的使用情况。为了降低重整气中苯的浓度，使用镍催化剂将苯加氢。该催化剂通常用于将气相不饱和烃转化为饱和烃，在蒸汽存在下，苯在 130 至 180 摄氏度的温度范围内转化为环己烷。然而，在 250 至 300 摄氏度左右会发生转化为甲烷的反应。甲烷似乎是一种有用的转化化合物，因为它不会像轻质焦油那样凝聚。有时，重整气需要冷却后才能用作发电机燃料。在这种情况下，如果在重整后将气体中的苯在 300 摄氏度左右转化为甲烷，则可以避免焦油凝聚。在 60 小时的反应期间，没有观察到转化为甲烷的效率降低。在 300 摄氏度左右，较低的碳氢化合物（乙烯、乙烷和丙烯）也会转化为甲烷。当存在高浓度的其他碳氢化合物时，苯的转化也是可能的。
