# Looking for Desiccants

I am an engineer and not the best at chemistry, I am horrible at it, but I was wondering if it is safe to mix sodium hydroxide and calcium oxide to make a desiccant that also captures carbon monoxide?

I am asking because I am trying to make a high quality zero air generator and need to lower the humidity and carbon monoxide and this seemed like a way to do it.

• Why would you want to mix NaOH with CaO? Yes, it is safe, but also useless. Jan 16 '18 at 16:07
• Sodium hydroxide and calcium oxide would remove water and carbon dioxide, but they would not remove carbon monoxide. For any significant flow, you would also have to figure out how to prevent the airflow from either clogging the "filter" or creating "channels" through the filter.
– MaxW
Jan 16 '18 at 16:25
• Can't you just buy sodalime to remove the CO2 and water? Won't do anything for the CO though. Jan 16 '18 at 17:12
• I suspect there might be a typo and OP meant carbon dioxide $\ce{CO2}$, not carbon monoxide $\ce{CO}$, since both NaOH and CaO are suited for $\ce{CO2}$ adsorption. Also, you are right that this mix can help to get rid of trace amounts of water, however hydration is quite exothermic (e.g. your adsorber is going to get warm). Jan 16 '18 at 17:19
• You will also need activated carbon to remove VOCs Jan 17 '18 at 9:00