The thermocatalysis is a process in which chemical reactions are accelerated by the combined action of heat (thermo) and a catalyst. It is one of the most widely used techniques in the chemical and petrochemical industries because it allows reactions to be carried out at lower temperatures, higher rates and with greater selectivity.

Fundamentals of Thermocatalysis

1. Role of heat:
   • Thermal energy provides the necessary activation energy for chemical reactions.
   • In thermocatalysis, the reaction rate is optimized by a controlled increase in temperature.
2. Role of the catalyst:
   • The catalyst lowers the activation energy of the reaction and offers an alternative reaction route.
   • This makes the chemical reaction more efficient, more selective and often more sustainable.
3. Combination of heat and catalyst:
   • Heat supports the mobility of the molecules and the energy barrier is further reduced by the catalyst.

Applications of Thermocatalysis

1. Petrochemical industry:
   • Catalytic cracking: Breakdown of large hydrocarbons into smaller ones, such as gasoline and diesel.
   • Reformation: Conversion of hydrocarbons into aromatics or hydrogen.
2. Chemical industry:
   • Ammonia synthesis: Thermocatalytic reaction of nitrogen and hydrogen (Haber-Bosch process).
   • Methanization: Production of methane from carbon monoxide and hydrogen.
3. Environmental technology:
   • Exhaust Aftertreatment: Thermocatalytic converters in vehicles to reduce nitrogen oxides and carbon monoxide.
   • Thermal decomposition: Degradation of pollutants such as dioxins or polychlorinated biphenyls (PCBs) through thermocatalytic processes.
4. Energy consumption:
   • Fuel cells: Thermocatalytic reforming of methanol or natural gas to produce hydrogen.
   • Biomass conversion: Production of biofuels through thermocatalytic processes.

Advantages of Thermocatalysis

1. High efficiency: Reactions occur faster and with less energy consumption.
2. Improved selectivity: Minimizing by-products and increasing yields.
3. Flexibility: Applicable to a wide range of chemical reactions.
4. Sustainability: Reduced emissions through optimized reaction conditions.

Challenges of Thermocatalysis

1. Temperature dependence:
   • Temperatures that are too high can lead to catalyst deactivation or undesirable side reactions.
   • Temperatures that are too low can reduce the reaction rate.
2. Catalyst aging:
   • Catalysts can lose activity due to deposits, poisoning or thermal stress.
3. Cost:
   • Highly specialized catalysts and precise temperature control require investment.

Example Reactions in Thermocatalysis