改性活性炭脱除氢气中微量甲醛的性能研究OA

Trace formaldehyde may be present in hydrogen derived from fossil fuels and industrial by-product hydrogen sources,and its direct use can shorten the service life of hydrogen fuel cells.Trace formaldehyde in hydrogen can be deeply removed by adsorption.A series of nitrogen-containing compound-modified activated carbon adsorbents were prepared.The adsorbents were characterized by N2 adsorption/desorption,SEM,EDS,elemental analysis and FT-IR,and their adsorption performance was evaluated using a fixed-bed reactor.The results show that,after modification,the specific surface area and total pore volume of the activated carbon increase to varying degrees,and the nitrogen content in the activated carbon increases.Modification with nitrogen-containing compounds can enhance the formaldehyde adsorption capacity of activated carbon.Among them,activated carbon modified with 2-imidazolidinone exhibits the best adsorption performance,with an adsorption capacity of up to 69.15 mg/g.Molecular simulation results indicate that nitrogen atoms in nitrogen-containing compounds possess high activity and can readily interact strongly with formaldehyde.The 2-imidazolidinone-modified activated carbon exhibits the highest saturated adsorption capacity for formaldehyde,and oxygen-containing groups with high electron density can form electrostatic interactions with formaldehyde molecules,thereby enhancing the adsorption performance.