Synthesis of Mixed Alcohols from CO Hydrogenation over Iron and Nickel Metal Phosphide Catalysts

Abstract

A series of silica supported iron and nickel metal phosphides with different molar ratios of P to metal were synthesized by the temperature programmed reduction method. Their catalytic performance for CO hydrogenation in a fixed bed reactor was tested with the conditions of 553 K, 5.0 MPa, and H 2 :CO = 2 (molar ratio). With the FeP x /SiO 2 catalysts ( x denotes the molar ratio of P to metal), the product was a mixture of oxygenates containing methanol as the major component. With the NiP x /SiO 2 samples, the liquid product was mainly methanol. The Fe 2 P, Fe 3 P, Ni, Ni 2 P, Ni 3 P, and Ni 12 P 5 phases were stable during CO hydrogenation, while most of the metallic Fe phase transformed into iron carbide. 通过程序升温还原法制备了一系列氧化硅负载的不同 P/M (M = Fe 和 Ni) 摩尔比的金属磷化物催化剂, 在 553 K, 5.0 MPa 和 H 2 :CO = 2 (摩尔比) 的反应条件下用固定床反应器测试了它们催化 CO 加氢反应性能. 结果表明, 在 FeP x /SiO 2 ( x 为 P/M 摩尔比) 催化剂上, 液相产物是以甲醇为主的低碳含氧化物的混合物. 而在 NiP x /SiO 2 催化剂上, 气态产物主要为甲烷, 液相产物绝大多数是甲醇. 表征结果表明, 磷化物催化剂上的 Fe 2 P, Fe 3 P, Ni, Ni 2 P, Ni 3 P 和 Ni 12 P 5 晶相在反应条件下是稳定的, 没有形成磷化物的金属铁, 在反应后转变成碳化铁晶相. FeP x /SiO 2 catalysts gave a mixture of oxygenates containing methanol as a major component while NiP x /SiO 2 catalysts gave a liquid product that was mainly methanol.