Iron-based catalysts have been one of the most active fields in coal direct liquefaction technology due to their advantages of a vast source of raw materials,low synthesis cost,and high catalytic activities.In this st...Iron-based catalysts have been one of the most active fields in coal direct liquefaction technology due to their advantages of a vast source of raw materials,low synthesis cost,and high catalytic activities.In this study,five oil-soluble iron-based catalysts with different carbon chain lengths were synthesized by reacting a series of fatty acid sodium salts with trivalent iron salts as raw materials.The catalyst precursors synthesized were structurally characterized using inductively coupled plasma emission spectroscopy,Fourier transform infrared spectroscopy,and high-resolution mass spectrometry.In the presulfurization and activity evaluation experiments of coal direct liquefaction carried out in an autoclave,it was found by X-ray diffraction transmission electron microscopy and X-ray photoelectron spectrometry that the iron oleate catalysts formed highly catalytic Fe1−xS phases during the sulfurization process,with average particle sizes of∼200-300 nm and uniform distribution.The results of catalyst activity evaluation showed that under the same reaction conditions(temperature 455°C,reaction pressure 19 MPa,residence time 60 min)and,with the same addition amount of m(Fe)/m(dry coal)=1%,the iron oleate catalyst exhibited excellent catalytic performance,with a coal conversion of 89.45%and an extraction oil yield of 64.04%,which was significantly better than that of other oil-soluble iron-based catalysts.It is worth noting that the iron oleate catalyst can achieve comparable catalytic performance at a lower addition amount(m(Fe)/m(dry coal)=0.5 wt%)compared with the ultrafine hydrated iron oxide(FeOOH)catalyst,which requires an addition amount of m(Fe)/m(dry coal)=1 wt%.This not only reduces the cost of catalyst usage but also simplifies the subsequent dehydration and drying processes.The findings of this study hold significant importance for the development of new,high-efficiency catalysts for coal direct liquefaction and offer a theoretical foundation and technical support for the industrial application of coal-to-liquid technology.展开更多
基金supported by the National Key R&D Program of China(2023YFB4103402)the National Energy Group Science and Technology Innovation Special Fund Project(GJNY-23-21).
文摘Iron-based catalysts have been one of the most active fields in coal direct liquefaction technology due to their advantages of a vast source of raw materials,low synthesis cost,and high catalytic activities.In this study,five oil-soluble iron-based catalysts with different carbon chain lengths were synthesized by reacting a series of fatty acid sodium salts with trivalent iron salts as raw materials.The catalyst precursors synthesized were structurally characterized using inductively coupled plasma emission spectroscopy,Fourier transform infrared spectroscopy,and high-resolution mass spectrometry.In the presulfurization and activity evaluation experiments of coal direct liquefaction carried out in an autoclave,it was found by X-ray diffraction transmission electron microscopy and X-ray photoelectron spectrometry that the iron oleate catalysts formed highly catalytic Fe1−xS phases during the sulfurization process,with average particle sizes of∼200-300 nm and uniform distribution.The results of catalyst activity evaluation showed that under the same reaction conditions(temperature 455°C,reaction pressure 19 MPa,residence time 60 min)and,with the same addition amount of m(Fe)/m(dry coal)=1%,the iron oleate catalyst exhibited excellent catalytic performance,with a coal conversion of 89.45%and an extraction oil yield of 64.04%,which was significantly better than that of other oil-soluble iron-based catalysts.It is worth noting that the iron oleate catalyst can achieve comparable catalytic performance at a lower addition amount(m(Fe)/m(dry coal)=0.5 wt%)compared with the ultrafine hydrated iron oxide(FeOOH)catalyst,which requires an addition amount of m(Fe)/m(dry coal)=1 wt%.This not only reduces the cost of catalyst usage but also simplifies the subsequent dehydration and drying processes.The findings of this study hold significant importance for the development of new,high-efficiency catalysts for coal direct liquefaction and offer a theoretical foundation and technical support for the industrial application of coal-to-liquid technology.
