${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}\text{c}\text{a}\text{t}\text{a}\text{l}\text{y}\text{s}\text{t}is\text{u}\text{s}\text{e}\text{d}in\text{t}\text{h}\text{e}\text{p}\text{r}\text{o}\text{d}\text{u}\text{c}\text{t}\text{i}\text{o}\text{n}of\text{u}\text{r}\text{e}\text{a}\text{f}\text{r}\text{o}\text{m}CO2\text{a}\text{n}\text{d}NH3.}$

Vanadium pentoxide

$No$

Alumina

Nickel