কোন শিল্প উৎপাদন পদ্ধতিতে প্রভাবক ব্যবহার করা যায় না?

$\mathrm{N}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{NH}_{3}(\mathrm{~g})$

$\mathrm{C}_{2} \mathrm{H}_{4}+\mathrm{H}_{2} \mathrm{O}(1) \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \text { (1) }$

$\mathrm{Fe}_{3} \mathrm{O}_{4}(\mathrm{~s})+\mathrm{C}(\mathrm{s}) \rightarrow \mathrm{Fe}(\mathrm{s})+\mathrm{CO}(\mathrm{g})$

$\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})$