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In this paper,a series of highly active and stabilized catalysts with different Au contents supported on the abandoned eggshell membranes(ESM)were successfully synthesized by an impregnation method.Au NPs were initially in situ synthesized on the ESM and the ESM was converted to carbonized eggshell membrane(CESM)after calcinations at 800 ℃ at nitrogen atmosphere.This special three-dimensional macroporous carbon film structure contributed to the adsorption of formaldehyde(HCHO).The oxidation of HCHO by these catalysts at room temperature was conducted via photoacoustic gas monitor(INNOVA 1412 i).The 1.87%Au/CESM catalysts could reach complete HCHO oxidation and it was noteworthy that the highly dispersed Au particles were 2-4 nm sizes.These sizes of Au NPs on CESM showed no obviously change when the calcination temperature was even up to 800℃,which challenged the traditional idea that the higher calcination temperature would result the Au NPs sintering to form larger cluster.It manifested that Au/CESM catalyst was a promising catalyst for HCHO removal.