Abstract
Previous studies showed that Cu/SBA-15-[N] had an excellent simultaneous adsorption–oxidation performance of hydrogen sulfide (H2S) and hydrogen phosphide (PH3), but the regeneration of deactivated Cu/SBA-15-[N] is still a difficult problem. In this work, acid pickling treatment (Rm-A), water washing (Ram-W), calcination (Rm-C) and acid pickling after calcining (Rm-CA) methods were used to study the regeneration performance of the deactivated Cu/SBA-15-[N]. The results showed that the most effective method was Rm-CA. Under optimal regeneration conditions (calcination temperature = 450 °C, HNO3 mass fraction = 13%), the sulfur capacity (23.73 mgS/g) and phosphorus capacity (100.49 mgP/g) of regenerated Cu/SBA-15-[N] were close to the fresh Cu/SBA-15-[N] (47.38 mgS/g, 136.42 mgP/g). The in situ IR indicated that the surface products of the sorbent were mainly in the form of oxides after calcination, these substances are transformed into the corresponding active components under the action of nitric acid. BET, XRD and TGA results indicated that the regeneration process did not destroy the deactivated Cu/SBA-15-[N] structure, but could change the surface of the group composition. The results of XPS reveal the copper content in different samples. After 3 times regeneration, the sulfur capacity and the phosphorus capacity of regenerated Cu/SBA-15-[N] could reach to 20.67 mgS/g and 88.43 mgP/g, which indicated that the Rm-CA method had good stability for the recovery of adsorption activity. This study provided an effective regeneration method that could also reduce the environmental hazards of deactivated Cu/SBA-15-[N].
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