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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: TTragedia on January 13, 2021, 09:01:14 PM

Title: A theoretical catalytic cycle for the oxidation of SO2 to H2SO4 via a Rh Complex
Post by: TTragedia on January 13, 2021, 09:01:14 PM

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.

Title: Re: A theoretical catalytic cycle for the oxidation of SO2 to H2SO4 via a Rh Complex
Post by: AWK on January 14, 2021, 03:05:14 AM

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