Nmr Studies of Cobalt-Thoria-Zsm-5 Catalysts

摘要: Abstract Co-ZSM-5 and Co-ThO 2 -ZSM-5 are promising bifunctional zeolite catalysts used for the conversion of synthesis gas to gasoline range hydrocarbons. Previous catalytic tests have shown that small amounts promoter thoria (0.4 wt%) significantly increase liquid hydrocarbon yields. Zero-field nuclear magnetic resonance studies were undertaken ascertain effect upon structural nature these catalysts. In Co-ZSM-5, NMR lines corresponding fcc hcp phases found. When was added, there a systematic absence line before use as catalyst. The change in behavior can be related changes crystallite species size.