Although iron in many catalytic applications is generally less expensive , it is less active and `` greener than other metals . Although iron is generally less expensive in many catalytic applications , it is less active and `` greener '' than other metals .
Walaupun besi dalam banyak aplikasi pemangkin umumnya kurang mahal, ia kurang aktif dan "lebih hijau daripada logam lain. Walaupun besi umumnya kurang mahal dalam banyak aplikasi pemangkin, ia kurang aktif dan "lebih hijau" daripada logam lain.