ANS:A - 700 - 1000

The optimum reaction temperature in steam reforming of naphtha is 700 - 1000°C. Steam reforming of naphtha is a chemical process used to produce synthesis gas (syngas), which is primarily a mixture of hydrogen (H2) and carbon monoxide (CO). This process involves the reaction of naphtha (a mixture of hydrocarbons) with steam (H2O) at high temperatures and in the presence of a catalyst. Operating at temperatures within the range of 700 to 1000°C allows for efficient conversion of naphtha into syngas. At lower temperatures, the reaction rate may be too slow to achieve high conversion rates, while excessively high temperatures can lead to thermal decomposition and reduce the selectivity of the desired products. Therefore, maintaining temperatures within the range of 700 to 1000°C provides a balance between reaction kinetics, product selectivity, and energy efficiency, making it the optimum temperature range for steam reforming of naphtha.