载体和钌含量对合成氨催化活性的影响
The Effect of Supporters and Ruthenium Contents on the Reaction Activity for Ammonia Synthesis
Abstract
传统的熔铁型合成氨催化剂的使用条件相当苛刻（450℃，1.5~3.5x105PA），近20年来国外一直致力于开发温和条件下使用的钌基合成氨催化剂［1，2］，并已取得了相当的进展［3］，可望在不久的将来完全实现工业化，代替铁基合成氨催化剂，成为一种高效... The effects of different supporters, such as active carbon, γ Al 2O 3、NaX molecular sieve, silica gel, Sm 2O 3, CeO 2, Y 2O 3 and C 60 (6%), and contents (2%￣6%) of ruthenium on reaction activity of ruthenium based catalysts for ammonia synthesis have been studied.The activity for ammonia synthesis of Ru based catalysts supported by different supporters decreased in the sequence of C 60 >Sm 2O 3>CeO 2>Y 2O 3>γ Al 2O 3>NaX>AC>silica gel, and the optimum content of ruthenium is 4 %, under 1×10 5 Pa; the Ru K/C 60 catalyst has the highest activity for ammonia synthesis at 350 ℃.Also, the Ru based catalysts have been characterized by SEM.