reaction distance
3.In the quartz reactor, when the granular size of catalyst is 20-30es(0.63-1.0mm), the bed height is about 25mm, the methane and oxygen mixture enters the reactor at the upper position of the reactor and the outlet distance between catalyst bed bottom and the heating oven is about 20mm, the results of the scaling up of catalyst charge from 30ml to 200ml are almost identical under the optimum reaction conditions.
