The Preparation of PdFe/Al2O3 Mercury Removal Sorbent by Chemical Co-Precipitation
1. State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Ministry of Science and Technology and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China;
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract Based on the fact that the precious metal Pd has better performance of removing mercury from coal-based fuel gas at mid-temperature and the ability of Fe2O3 to remove the elemental mercury (Hg0) and hydrogen sulfide (H2S) simultaneously from middle and low-temperature fuel gas, a series of PdFe/Al2O3 sorbents were prepared by co-precipitation method under different conditions using (NH4)2CO3 as the precipitant. The performances of the sorbent for elemental mercury removal were investigated in the N2-CO-H2-H2S-Hg atmosphere (simulated coal gas) in a fixed-bed reactor at 200 ℃. The effects of pH value and the calcination temperature of the precipitation system on the physicochemical properties of sorbents and mercury removal performance were studied. The mercury removal mechanism of adsorbent was also discussed. The sorbents were characterized by N2 adsorption, X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS). The results showed that the pH value and the calcination temperature affected the physical structure of sorbents and the surface content of active component Pd on the sorbents, thereby affecting the mercury removal performance of the adsorbent. Under the condition of pH value 8 and calcination temperature 700 ℃. The prepared sorbent had the highest mercury removal efficiency.
Huo Qihuang1,Qi Denghui1,Ye Liang1 et al. The Preparation of PdFe/Al2O3 Mercury Removal Sorbent by Chemical Co-Precipitation[J]. 化学反应工程与工艺, 2017, 33(5): 450-457.
Huo Qihuang1,Qi Denghui1,Ye Liang1 et al. The Preparation of PdFe/Al2O3 Mercury Removal Sorbent by Chemical Co-Precipitation[J]. 化学反应工程与工艺, 2017, 33(5): 450-457.
