Ammonia oxidation in a microreactor

What is a microreactor?

A catalyst is (per WBM2000) a substance that causes a chemical reaction while itself remaining practically unchanged. Catalysts are used because they speed up reactions, and they are not used just in chemical plants. Our bodies and all other living things make all sorts of catalysts; they are called enzymes. WBM2000 tells us that the word enzyme comes from two Greek words meaning in yeast. Many scientists who studied enzymes in the 1800's studied reactions caused by yeast enzymes. We couldn't make bread or pizza dough without a catalyst

BUT ...

If you're sort of lost, here's how to get all the way back to the beginning of the high school version