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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 something that is going to be converted in a catalyst later in the reaction. Precatalysts are easier to store than catalysts.
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.
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 an enzyme and a catalyst and how are they similar. Please be very specific for me?
Enzyme slow down a reaction while catalyst speed up reactions. Enzyme contain a zinc content which makes it a metal, as well as catalyst; so that is one example of their simularities.
How many moles of precatalyst are used in this reaction?
This is specific to a reaction that must be provided
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
