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.
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 trans-formed into iron carbide.
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