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Nitric Oxide Catalyses

Posted: Mon Mar 12, 2018 12:26 pm
by lizzygaines1D
For the example in lecture today:
NO+1/2O2---->NO2
NO2---->NO+O
O2+O----->O3
NO is not an intermediate because it is a catalyst. The only way we knew this is because the example was nitric oxide catalyses or is there any other ways to determine which molecule is the catalyst?

Re: Nitric Oxide Catalyses

Posted: Mon Mar 12, 2018 12:28 pm
by RyanS2J
You can determine NO is a catalyst from the fact that it is a species that appears as a reactant in an early step and as a product in a later step, indicating that the species is not consumed in the reaction, a fundamental property of catalysts.

Re: Nitric Oxide Catalyses

Posted: Mon Mar 12, 2018 3:53 pm
by diangelosoriano
Is there a way to tell by looking at these equations if the catalyst was heterogeneous or homogeneous?

Re: Nitric Oxide Catalyses

Posted: Mon Mar 12, 2018 4:19 pm
by Michelle Dong 1F
Catalysts are present in the beginning of the reaction and do not get consumed (so it appears in the products side in the next elementary step), while intermediates are formed in one elementary step and then are consumed in the next elementary step.

Re: Nitric Oxide Catalyses

Posted: Mon Mar 12, 2018 5:17 pm
by Johann Park 2B
diangelosoriano wrote:Is there a way to tell by looking at these equations if the catalyst was heterogeneous or homogeneous?

A catalyst is homogeneous if it is in the same phase as the reactant R.
It is heterogeneous when it is in a different phase as R; in this case it is usually a solid.

Re: Nitric Oxide Catalyses

Posted: Tue Mar 13, 2018 1:35 am
by Seth_Evasco1L
Species that appear in the overall reaction can be ruled out as being the intermediate or catalyst.

An intermediate is produced in one elementary step and then consumed in a subsequent elementary step.

A catalyst is found on the reactants side of one elementary step and also on the products side in another elementary step.

Re: Nitric Oxide Catalyses

Posted: Tue Mar 13, 2018 12:14 pm
by Michelle Steinberg2J
An intermediate is formed and then used.
A catalyst is used and then formed.