| In this paper,Cu（Ⅱ）was loaded onto NaY molecular sieve by impregnation and solid-state thermal dispersion for reduction to prepare Cu（Ⅰ）/NaY adsorbent,and the factors influencing the adsorption effect of the adsorbent preparation process on the adsorption effect of the adsorbent,such as the type of reducing agent,the loading amount of copper salt,the molar ratio of copper salt to the reducing component and the roasting temperature,were analyzed by experiment.In this experiment,the dynamic adsorption experiments of CO were carried out in a fixed bed at 25°C,0.2 MPa,raw gas flow rate of 20 m L/min and CO concentration of 1000 ppm,and the penetration adsorption curves were plotted to calculate the dynamic penetration adsorption amount and compare with the CO adsorption performance of NaY molecular sieve alone.1.Cu（Ⅰ）/NaY adsorbent was prepared by mixing CuCl2 and Cu（Ac）2 as the reducing component and then loaded onto NaY molecular sieve by impregnation method,followed by roasting under N2 atmosphere for 4 h.The maximum adsorption capacity of the prepared Cu（Ⅰ）/NaY adsorbent was 23.3 m L/g at a loading of 4 mmol Cu/g,a roasting temperature of450°C,and a molar ratio of CuCl2 to Cu（Ac）2 of 1:1.The adsorbent was characterized by BET,XRD,XPS,and SEM under optimal conditions.The adsorbent was prepared under optimal conditions in which the divalent copper was reduced to monovalent copper,and the monovalent copper was highly dispersed on the surface of NaY molecular sieve.The adsorption performance of the adsorbent decreased after regeneration for four times by nitrogen purging at 80°C for 1 h,but remained basically unchanged.The adsorption performance of the loaded adsorbents prepared with NaY,H-ZSM5,Na-ZSM5,10X,γ-Al2O3and LSX as carriers was then compared under the optimal conditions,and the BET analysis of NaY as a carrier could make the Cu（Ⅰ）better loaded and dispersed and thus facilitate the binding of CO with the active component,thus achieving the adsorption separation effect.2.When K2C2O4 was used as the reducing component,the CO adsorbent was prepared by loading CuCl2 and K2C2O4 onto NaY molecular sieve in a certain ratio by impregnation method,and the best performance of the adsorbent was obtained when the loading amount of CuCl2 was 4 mmol/g,the roasting temperature was 450°C and the molar ratio of CuCl2 to K2C2O4 was 2:1.Due to the instability of urea after heating,the CO adsorbent was prepared by solid-state thermal dispersion method by loading CuCl2 and urea onto NaY with a CuCl2loading of 4 mmol/g,a roasting temperature of 450°C and a molar ratio of CuCl2 to urea of2:1.The best performance of the prepared adsorbent was achieved with a penetration adsorption capacity of 21.3 m L/g;The regeneration performance of both was investigated.After regenerating the adsorbent for 4 times with 1 h of nitrogen purge at 80°C,the performance of the adsorbent decreased slightly but remained basically the same. |
