科研之友
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摘要
In order to utilize high concentration CO comprehensively, impregnated activated carbon sorbent and the catalytic oxidation reaction for PH(3) were investigated in this study. Carbon was impregnated with HCI, KNO(3), or hexanediol. The activated carbon modified by 7% (mass fraction) HCI could enhance the adsorption purification ability significantly. Raising the reaction temperature or increasing the oxygen content of the gas can improve the purification efficiency. The structure of the materials after modification was determined using nitrogen adsorption. The modification decreased the volume of pores smaller than 2 nm in diameter with the most noticeable change occurring in the micropores ranging from 0.3 nm to 1.5 nm in diameter. Decreases in micropore volume accounted for 87% of the total pore volume change. After the adsorption. the surface areas decreased 28%, 29% of which was due to decreased micropore surface. HCI significantly increased the performance of carbon as a PH(3) adsorbent when HCI impregnation was applied whereas the effects of other materials used in this study were much less pronounced. HCI present in the small pores probably acted as a catalyst for oxygen activation that caused PH(3) oxidation. As a result of this process, H(3)PO(4) and P(4)O(10) were formed, strongly adsorbed, and present in the small pores ranging from 0.3 nm to 1.5 nm. In conclusion, this study provides evidence that CO from industrial off-gas can be purified and used as the raw material for a broader range of products.
- 出版日期2009-11-15
- 单位昆明理工大学
