Preparation And Properties Of Ce-Fe Double Metal Oxide/Porous Carbon Nano-hybrid Materials

Ce,Fe metal oxide itself has excellent active oxygen carrier properties and can combine with a specific carrier to produce a composite material with excellent activity.Humic acid is rich in surface functional groups,making it hydrophilic,acidic,and complexing.It can be extracted from low-grade low-quality coal by large-scale extraction using simple chemical methods.It canconvert into a large specific surface and special pores structured porous carbon support.In this paper,low-rank lignite was used as raw material to prepare porous carbon through the modification of humic acid.It used humic acid and its prepared porous carbon as carriers,combined with Ce and Fe metal oxides to investigate the adsorption of Congo red on the composites and catalyzed propane dehydrogenation performance,studied the carrier properties of humic acid-based porous carbon and its carrier effect on the adsorption and catalytic performance of composites.The results of its research show that:?1?Using hydrothermal method,in the high-temperature and high-pressure stainless steel hydrothermal reactor,the morphology of the synthesized nano-microspheres is controlled by controlling the Ce/Fe molar ratio in the reaction system,and it synthesized a Ce-Fe double metal oxide composite nano-material.The CeO₂-Fe₂O₃ nanocomposite nanospheres with uniform morphology,uniform size,and uniform dispersion can be prepared at a hydrothermal temperature of 180°C for 8 h.CeO₂-Fe₂O₃ composite nanomaterials as adsorbents have good adsorption performance for different concentrations of Congo red solution.?2?Humic acid during the hydrothermal synthesis reaction produces some by-products such as formic acid,acetic acid,etc.These by-products can combine with Ce³⁺and Fe³⁺to produce humic acid-based cerium iron nanocomposites under hydrothermal conditions?Ce-Fe/HA-x?and study its adsorption performance to Congo red solution and catalyzed propane dehydrogenation performance.Ce-Fe/HA-x is a large-area sheet with a rough surface and a high specific surface area and pore volume.Ce-Fe/HA-x has certain adsorption properties for different concentrations of Congo red solution.The results of catalytic oxidation of propane to dehydrogenation to propylene in a CO₂ atmosphere show that the reaction temperature,CO₂ partial pressure,and space velocity all have an effect on the catalytic effect.The catalyst prepared by loading bimetallic particles on the humic acid surface is more stable than pure humic acid,and has better catalytic effect and regeneration ability.?3?Using humic acid as a carbon source and melamine as a nitrogen source,nitrogen-doped humic acid porous carbon?HMCN?is obtained after activation and high-temperature calcination,and then it impregnate metal Ce to obtain cerium-supported nitrogen-doped humic acid radicals.Porous carbon?xCe-HMCN?,due to its high specific surface area and abundant pore structure,has excellent adsorption to Congo red indicator.The results of catalytic oxidation of propane to dehydrogenation to propylene in a CO₂ atmosphere indicate that the effect of xCe-HMCN sample after Ce loading on the dehydrogenation of propane is improved compared to pure HMCN.Ce loading and reaction temperature all have a certain influence on the catalytic activity of xCe-HMCN.