Hydrocracking catalysts vary widely. The cracking reactions are induced by materials of the silica-alumina type. In units that process residual feedstocks, hydrogenation catalysts such as nickel, tungsten, platinum, or palladium are employed.
What catalysts are used in cracking?
Various methods can be used for cracking, eg catalytic cracking and steam cracking: Catalytic cracking uses a temperature of approximately 550°C and a catalyst known as a zeolite which contains aluminium oxide and silicon oxide.
Which catalyst is used in petrochemical industries for cracking of hydrocarbons?
The hydrocarbons are mixed with a very fine catalyst powder. These days the catalysts are zeolites (complex aluminosilicates) – these are more efficient than the older mixtures of aluminium oxide and silicon dioxide.
What are the 2 types of cracking?
Cracking is primarily of two types – thermal cracking and catalytic cracking. Thermal cracking is further categorised into modern thermal cracking and steam cracking. On the other hand, sub-classifications of catalytic methods of cracking are hydrocracking and fluid catalytic cracking. 3.
What are two conditions needed for cracking?
Thermal cracking uses harsh conditions like high temperature and high pressure. It breaks the alkanes into a high percentage of alkenes and comparatively few alkanes. Thermal cracking is done at about 1,000 degrees Celcius and 70 atm pressure.
What type of reaction is cracking?
Cracking is an example of a thermal decomposition chemical reaction.
In which type of cracking catalyst is more with heavy oil?
Typically, using zeolite-based catalysts in hydrocracking results in greater cracking activity owing to its greater acidity. In addition, the use of zeolite-based catalyst improves thermal or hydrothermal stability and resistance to nitrogen/sulfur compounds.
Which catalyst is used in hydrodesulfurization?
1 INTRODUCTION. Hydrodesulfurization and hydrodenitrogenation are industrially very important reactions which occur on sulfided CoMo/Al2O3 and NiMo/Al2O3 catalysts in the presence of hydrogen and hydrogen sulfide.