화학공학소재연구정보센터
Catalysis Today, Vol.298, 209-215, 2017
Metal organic framework-mediated synthesis of potassium-promoted cobalt-based catalysts for higher oxygenates synthesis
Syngas to higher oxygenates conversion was carried out on a series of potassium-promoted cobalt-based catalysts. Catalysts with different potassium composition were prepared by metal organic framework-mediated synthesis, which is the calcination of the ZIF-67 metal organic framework (MOF). Cobalt skeleton structure that originated from the MOF is preserved after the calcination. The calcined catalysts consist of Co3O4 nanoparticles and surface carbon. The catalysts were reduced by H-2/He prior to the reaction. CO hydrogenation was carried out at various temperatures (270 degrees C, 300 degrees C and 325 degrees C) and at 40 bar, with H-2/CO = 1/1. The formation of methane and higher hydrocarbons is suppressed by potassium, and cobalt carbide is formed from metallic cobalt during the reaction. Thus, the K-promoted cobalt based catalyst synthesized by the MOF-mediated synthesis shows higher selectivity to ethanol, acetaldehyde and higher oxygenates, even at high temperatures.