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Why are hydrocarbons cracked?
- Shorter, more VALUABLE chains are produced
- Some of the products are ALKENES, more reactive than alkanes
Thermal cracking - temperature
Thermal cracking - pressure
up to 7000kPa
Thermal cracking - products
High proportion of ALKENES
Catalytic cracking - temperature
Catalytic cracking - pressure
lower pressure (more than atmospheric)
Catalytic craking - catalyst
What is the catalyst used in catalytic cracking made out of?
- Silicon dioxide
- Aluminium oxide
Is the catalyst used in catalytic cracking acidic or alkaline?
Catalytic cracking - products
- Motor fuels:
- branched ALKANES
- aromatic compounds
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