This paper is proposed to research the carbon deposit in steam-hydrocarbon reforming, which mainly determines the life of catalysts.
Steam to carbon ratio was varied in range from the ratio larger than theoretical value of thermodynamics to the ratio smaller than operation value of industry.
The effect of NH₃or CO₂gas in raw feed gas to carbon deposit was examined.
The component and structure of deposited carbon was analyzed by IR and EMS.
The following results were obtained.
1） The NH₃or CO₂gas in raw feed gas does not effect on the activity of catalyst.
2） The NH₃or CO₂gas in raw feed gas constrains carbon deposit.
3） The structure of carbon deposited in the C₃H₈-H₂O-NH₃reaction is different from those deposited in the C₃H₈-H₂O-CO₂reaction and the C₃H₈-H₂O reaction.