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Pre-catalyst is a catalytic converter that is fitted to Diesel engines to control emissions soon after engine start up when the main catalytic converter is not yet up to operational temperatures. In Europe a pre-catalyst is commonly used where a Diesel Particulate filter is fitted for stage 4 and 5 emissions requirements. The DPF is placed upstream from the main catalyst and in turn prevents the main catalyst heating up quickly enough to control the very initial emissions.
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What is a precatalyst?
A precatalyst is a chemical compound that can be converted into an active catalyst through a chemical reaction or activation step. It is typically used in catalytic processes to initiate the catalytic cycle and enhance the efficiency of the catalyst.
What is the difference between a homogeneous catalyst and a heterogeneous catalyst?
The difference between a homogeneous and a heterogeneous catalyst is that in a heterogeneous catalyst, it is in a different phase from the reactants. However, in a homogeneous catalyst, it is in the same phase as the reactants.
How many moles of precatalyst H2ptcl6 are used in this reaction?
The number of moles of catalyst depends on the reaction under consideration. Compared to the substrate, about 10-2 to 10-6 times of the catalyst can be used. The lower the amount of the catalyst, the more effective it is.
What is the main difference between a heterogeneous catalyst and a homogeneous catalyst?
The heterogeneous catalyst is not mixed with the reactants.
How many moles of precatalyst are used in this reaction?
The number of moles can be calculated by dividing the given mass of the precatalyst by its molar mass. Just use the formula: Number of moles = Mass of precatalyst (g) / Molar mass of precatalyst (g/mol).
What is the difference between an inhibitor and catalyst?
Catalyst speeds up reactions, and inhibitors are used to slow down reactions.
What is the difference between enzymes and catalyst?
There is no difference. An enzyme is a natural catalyst. Catalysts speed up the rate of reaction without being used up itself.
What is the difference between a catalyst and an inhibitor?
Catalyst: a substance which promote and help a chemical reaction. Inhibitor: a substance which greatly reduces the rate of a chemical reaction.
The difference between catalyst and inhibitor?
A catalyst lower the activation energy (speeds up the reaction) while an inhibitor increases the activation energy (slows it down).
What is the difference between positive catalyst and negative catalyst?
The substances which increase the rate of a chemical reaction are called a Positive Catalyst whereas The substances which decrease the rate of a chemical reaction are called Negative Catalyst. Positive Catalyst decreases the Activation energy of reactant molecules whereas negative catalyst increases the Activation energy of the reactant molecules. Positive Catalyst is also called the Promoter whereas negative catalyst is also called Inhibitor.
What is the relationship between an enzyme and a catalyst?
enzymes and catalyst both are the substance which increase the rate of reaction several 100 to 1000 times. Both are specific in temprature and for substratethe only difference between them is that enzymes are found in livingbeings or we can say that enzymes are biological catalyst
What most likely accounts for the difference between a curve A and curve B on the energy diagram?
The reaction described by curve B is occurring with a catalyst.------Apex <('-'<)
