Describe purified nitrogen and hydrogen passing over an iron catalyst. (Chemistry only)

The Haber process is an industrial method for synthesizing ammonia by reacting purified nitrogen and hydrogen gases. In this process, nitrogen is typically sourced from the air, while hydrogen is often derived from methane or natural gas through steam reforming. The gases are passed over an iron catalyst at high temperatures (around 450 degrees Celsius) and pressures (approximately 200 atmospheres). The iron catalyst accelerates the reaction, allowing nitrogen and hydrogen to combine efficiently to form ammonia, which is crucial for producing nitrogen-based fertilizers.