Conventional preparation methods of catalysts

The most important challenge is to confer desired characteristics to the solid, aiming to design specific catalysts. In most cases, there are conventional direct procedures 

The formulation of a correct catalyst is a compromise between the fluid flowing system of the reactor and the activity or stability. The relative importance of these factors depends on the reaction system, the reactor design, reaction conditions, and economic factors. 

Flow distribution and low pressure drop can be achieved selecting particles with appropriate sizes and formats and good mechanical resistance. The formulation or fabrication of a catalyst must attend a specific industrial process. The more severe are the conditions (charge, temperature, and high pressures or space velocities) the more difficult are the design parameters of the catalyst. 

In general, catalyst can be classified into three categories  

The active sites or phases are the most important components and responsible for reaction occurring. The first choice to design a new catalyst is the selection of the active component. 

---