| 摘要 |
PURPOSE:To ignite natural gas at low temperature and raise a temperature of ignited gas up to a temperature of 750-1,000 deg.C by a method wherein a first layer is provided with a catalyst layer having as active component palladium and platinum, a second layer is provided with a catalyst layer having as active component platinum and a third layer is provided with a catalyst layer having as active component palladium or both palladium and platinum in an order from the inlet side, respectively. CONSTITUTION:A first layer catalyst having a superior characteristic of ignition at low temperature and having as active component palladium and platinum, a second layer catalyst having as active component platinum and a third layer catalyst having as active component palladium or both palladium and platinum are combined to each other. At the first layer catalyst near the inlet of the catalyst system, a reduction in igniting characteristic of methane is prevented and it is possible to increase the temperature of combustion gas up to 700- 800 deg.C, then it is increased up to 750-900 deg.C through the second layer catalyst and finally the combustion gas is reached to a temperature of 800-1,000 deg.C through the third layer catalyst. |
