科研之友
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摘要
In this study, acid modified Cu/SBA-15 adsorbents were used to simultaneously remove H2S and PH3. The adsorbent was prepared by the wet impregnation method in which acid type and concentration are the main factors investigated. The test results showed that adsorbent modified by hydrogen nitrate had the highest adsorption potential of all materials tested, and the breakthrough adsorption capacity of this adsorbent was determined to be 35.25 mgS/g and 104.84 mgP/g with 8 wt% hydrogen nitrate. Characterization results showed that hydrogen nitrate does not do great damage to the original groups on or the surface structures of Cu/SBA-15 adsorbent. FT-IR and XRD analysis showed that the removal capacity of H2S and PH3 is dependent on the number of Si-OH groups and active components available to transform the target gases to corresponding sulfur and phosphorus species (CuS, S, P2O5). Pore structure tests indicated that modification did not change the mesoporous structure of the Cu/SBA-15 adsorbent and that the performance of the Cu/SBA-15-[N] adsorbent was optimized for simultaneous adsorption/oxidation of H2S and PH3. Alternatively, pores in the range of 7-9 nm favored the simultaneous adsorption/oxidation of H2S and PH3. In addition, in situ IR analysis revealed that the exhaustion of sample adsorption sites was accompanied by the disappearance of active components and the generation of sulfur and/or phosphorus species. The NH2- and NH2- groups on Cu/SBA-15-[N] may function as a trap for target gases, and the copper salts serve mainly to purify them further in the presence of O-2. Because the reaction processes for H2S, PH3 adsorption and oxidation are different from one another, it was hypothesized that different gases may also participate in competitive adsorption on the surface of the Cu/SBA-15-[N] adsorbent.
