I have been interested in carbon monoxide, but one needs a lot of knowledge to avoid serious permanent brain damage. I made Google search with words: formic acid, sulphuric acid, carbon monoxide. I found a thread from this forum. There was such a good information that I immediately made several Screenshots.
Later I found out, that purchasing of concentrated formic acid and concentrated sulphuric acid is very difficult in this island as a private person. I will continue studying another method including oxalic acid and phosphoric acid, which are available even here. Certainly the reaction temperature must be high, but must not reach oxalic acid boiling point of 157 Celsius. I guess 110 Celsius might be close to right reaction temperature. I am not a real chemist, but I am willing to further studying and making experiments once I have time. My situation is far from urgent.