What is the market for room temperature carbon monoxide oxidation catalyst?

I have no experience in chemistry or in mining, but I do have experience in business and market analysis.  I can give you some general suggestions, but you'll probalby need to do the investigation yourself.
First, you probably want to limit your investigation to mines in the US.
You would then want to identify the total number of underground mines in the US (as opposed to open or strip mining).
Then you would somehow want to assess the size of each mine, perhaps in terms of the total volume of air in each mine.  
From there, you would need to perform some analysis in terms of normal composition of this air (ie. How much CO, how much CO2, O2, Nitrogen, etc.)
With this information, you should be able to determine the total volume of CO in each mine at a given time.  With that, you would then want to calculate the toal amount of CO in all mines.
The next step, I would think, is to perform some analsysis with regard to the absorption/conversion rate of that CO oxidation catalyst you mention. ie. conversion rate per hour, as an example.
From there, you should be able to calculate how much catalyst would be needed to make this conversion for all CO gas in all mines in the US for a given amount of time and then expand that calculation out to a yearly number.  This would give you a rough estimate of a Total Addressable Market for this product.