Time scale is also something I want to know about. "Can I remove CO2 from the air and turn it into something valuable in a way that is cost effective?" is one question. Another question is, "Can I remove CO2 from the air and turn it into something valuable faster than a tree?"
They should sell it to people for their car tires with a specially colored valve cap like they do for nitrogen. It'd be stupid, but so is paying extra for a slightly higher nitrogen content and people do that.
That sort of application is just spitting into the ocean when you're talking about global CO2 emissions and sequestration.