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

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 H2:CO = 2 (molar ratio). With the FePx/SiO2 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 NiPx/SiO2 samples, the liquid product was mainly methanol. The Fe2P, Fe3P, Ni, Ni2P, Ni3P, and Ni12P5 phases were stable during CO hydrogenation, while most of the metallic Fe phase transformed into iron carbide.

摘要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 H2: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 FePx/SiO2 (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 NiPx/SiO2 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 Fe2P, Fe3P, Ni, Ni2P, Ni3P 和 Ni12P5 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. 

FePx/SiO2 catalysts gave a mixture of oxygenates containing methanol as a major component while NiPx/SiO2 catalysts gave a liquid product that was mainly methanol.Figure optionsDownload as PowerPoint slide