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