Although iron is generally less active in many catalytic applications , it is less expensive and " greener " than other metals .
Although iron in many catalytic applications is generally less active , it is less expensive and " greener than other metals .
Although iron in many catalytic applications is generally less active , it is less expensive and " greener than other metals .
Rephrase this text: Although iron is generally less active in many catalytic applications , it is less expensive and " greener " than other metals . Output: