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A theoretical catalytic cycle for the oxidation of SO2 to H2SO4 via a Rh Complex

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TTragedia:
Hi all!

I am trying to solve an inorganic chemistry homework that basically demands a proposition for a catalyctic cycle mechanism that will catalyse the following reaction:

SO2 + 1/2 O2 + H2O  :rarrow: H2SO4

We are also required to use a metallic complex with Rh as the core, Br and CO as ligands.

I think we need to oxidize the SO2 to SO3 using the 1/2 O2 in the process and react the resulting SO3 with H2O to obtain H2SO4.

Like in the following figure from Atkins:

https://imgur.com/m5hlnf1

I also though of:


* Migratory Insertion (especially regarding CO, but this doesn't go anywhere because there is nothing organic)

* Oxidative Addition / Reductive Elimination (This may be useful during the addition of O2 to make Rh go from 16 electron +I state to 18 electron +III state)

* Redox

* Ligand Substition

I also looked closely at Wilkinsons and the below one: https://imgur.com/fwkB3mc

However, I cannot devise anything it has been at least 8-9 hours! I am really frustrated and would appreciate some help. Thank you.

AWK:
Are you sure that any rhodium chemical will not react with SO3 or H2SO4?

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