WorksheetsPetrochemical catalysts #4
Total questions: 17
Worksheet time: 27mins
What does catalytic hydrogenation mean?
Addition of a pair of hydrogen atoms to an alkene or alkyne molecule in the presence of a catalyst
Addition of a pair of oxygen atoms to an alkene or alkyne molecule in the presence of a catalyst
Removal of a pair of hydrogen atoms to an alkene or alkyne molecule in the presence of a catalyst
Removal of a pair of oxygen atoms to an alkene or alkyne molecule in the presence of a catalyst
What are the typical catalysts used in catalytic hydrogenation?
Nickel, palladium and nitrogen
Carbon, nitrogen and nickel
Palladium, platinum and nickel
Nickel, sulfur and palladium
Which type of catalyst is more common for hydrogenation process in industries?
Homogeneous
Heterogeneous
Which of these process flow is in the correct order when catalytic hydrogenation happens?
Activation of catalyst - Adsorption - Hydrogenation - Catalyst recycled - Desorption
Activation of catalyst - Adsorption - Hydrogenation - Desorption - Catalyst recycled
Adsorption - Activation of catalyst - Hydrogenation - Desorption - Catalyst recycled
Adsorption - Activation of catalyst - Hydrogenation - Catalyst recycled - Desorption
Why are heterogeneous catalysts for hydrogenation more common industrially than homogeneous? (Hint: think of the phase of the catalysts and the reactants)
They are cheaper
They are easily to obtain
They are easier to separate
They are recyclable
Hydrotreating is used to remove impurities like heteroatoms to produce high quality fuels for transportation. What gas does this process require?
Sulfur
Oxygen
Nitrogen
Hydrogen
Why are compounds containing NOS and metals in petroleum products undesirable? Choose ALL of the correct answers
They are expensive
They reduce fuel stability
They damage the engines
They contribute to the emission of pollutants in the air
Hydrocracking is a process combining ___________ and ___________ in the presence of hydrogen and catalyst.
Catalytic cracking and hydrogenation
Catalytic cracking and hydrotreating
Catalytic hydrogenation and hydrotreating
Catalytic hydrogenation and cracking
The composition of the hydrocracking catalyst contains two parts. Which parts of the catalyst promote cracking activity?
Silica-alumina portion
Rare-earth metals portion
In hydro-desulfurisation, ethanethiol is treated with hydrogen to remove sulfur. What poisonous sulfur gas came out as the product?
HS
H2S
H3S
H4S
What do CoMo and NiMo catalysts stand for in hydrotreating process?
Copper/Molybdenum and Nickel/Molybdenum
Copper/Molybdenum and Nitrogen/Molybdenum
Cobalt/Molybdenum and Nickel/Molybdenum
Cobalt/Molybdenum and Nitrogen/Molybdenum
In their reactive form, CoMo and NiMo catalyse the reactions that convert sulfur and nitrogen impurities into _________ and __________.
HS and NH3
H2S and NH2
HS and NH2
H2S and NH3
Which one of these is an unsaturated hydrocarbon?
What are the harmful effects of heteroatoms in refinery stream? Choose ALL of the correct answers.
Deactivate catalysts
Promote coke formation
Poison catalyst
Damage engine
Name THREE rare earth metals that could be used in hydrocracking catalyst.
Cobalt
Molybdenum
Tungsten
Palladium
Which type of petroleum fractions have the HIGHEST concentration of impurities in them?
Light feedstock
Intermediate feedstock
High molecular weight feedstock
What does SWEET hydrocarbon mean?
Hydrocarbon that has a LOW concentration of sulfur impurities in them
Hydrocarbon that has a HIGH concentration of sulfur impurities in them
