Highlighted: Consider revising 

Cross out: doesn't make sense, delete or fix. 

Harbor was born in a wealthy Jewish family in Germany* and worked on a study to synthesize ammonia from nitrogen gas and hydrogen gas around 1903. Prior to the 18th century, I was supplementing enough nitrogen by planting manure and livestock excrement as fertilizer in the field or by rotating leguminous plants, but since the 19th century when the population began to increase rapidly It has become necessary to add fertilizer other than.

After hardship, Harbor succeeded in synthesizing ammonia at a temperature of 550 ° C and a pressure of 175 atm in July 1909. Specifically, after refining hydrogen from methane, ammonia was synthesized by reacting the hydrogen and air with iron as a catalyst.

3H2+2NH3⇄2NH3

However, what kind of catalyst is most suitable for synthesis is a mystery. There, the harbor repeated the experiments hundreds of times and figured out that the osmium catalyst was statistically the best.

In this way, the world's most productive chemically synthesized product has now become ammonia. Ammonia is now used for agricultural fertilizers, synthetic fibers such as nylon and rayon, and it is a chemically synthesized product that human beings must live.

*was Habor born in Germany, or was the family from Germany, or both?