みず蒸気 じょうき改質 かいしつではありませんでした
mizu jōkika ishitsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 水蒸気改質

1. Was not steam reforming.; Was not steam reforming (as a process).

Past/Perfective
Negative
Polite
Formal Register
Chemistry