Effects of SO2 and O2 on Hg0 removal capacity of sulfur modified petrol coke adsorbents

doi:10.16085/j.issn.1000-6613.2017-1399

Abstract

Abstract: Petrol coke was modified uisng SO₂ as a gas activating agent. The physical and chemical properties of adsorbents were characterized using surface area and porosity analyzer, elemental analyzer,and X ray photoelectron spectroscopy (XPS). Mercury adsorption experiments were carried out on the fixed bed testing equipment;and the adsorption products were desorbed by temperature-controlled desorption experiment. The results indicated that the microstructure of the surface of the modified petrol coke had been improved effectively;and the surface sulfur content was dominated by the low valence sulfur which was beneficial to mercury adsorption. Adding O₂ to the simulated flue gas could effectively improve the mercury removal efficiency. But the addition of the SO₂ could inhibit mercury removal. the inhibition degree increased with the increase of the SO₂ concentration. When O₂and SO₂ were added together,the effect on removal of mercury was closely related to the concentration of the SO₂. The experiments of mercury adsorption and temperature-programmed desorption at different temperatures showed that the high temperature could inhibit the oxygen-containing functional groups on the surface of the high sulfur petrol coke.

Key words: sulfur modification, petrol coke, sulfur dioxide, oxygen, mercury removal

摘要： 利用SO₂作为气体活化剂改性石油焦制备脱汞吸附剂；通过比表面积及孔隙度分析仪、元素分析仪及X射线光电子能谱分析（XPS）等方法对吸附剂的物理化学性质进行表征；在固定床实验装置上对改性石油焦进行汞吸附实验，并对吸附产物进行程序升温脱附。结果表明，SO₂活化改性后的石油焦表面结构得到有效改善，表面硫形态以有利于汞吸附的低价态硫为主。在模拟烟气气氛中加入O₂能够有效提高脱汞效率，加入SO₂则会对脱汞产生抑制作用，且抑制程度随SO₂浓度的增加而增强。在模拟烟气气氛中同时加入O₂和SO₂，对脱汞产生的作用效果与SO₂的浓度有关。对比不同温度下的汞吸附与脱附结果，证明高温会对石油焦表面含硫、含氧官能团产生抑制作用。

关键词: 硫改性, 石油焦, 二氧化硫, 氧气, 脱汞

CLC Number:

X511

LI Na, WEI Hongqi, DUAN Yufeng, WANG Chenping, SHE Min, HU Peng, WANG Shuangqun. Effects of SO₂ and O₂ on Hg⁰ removal capacity of sulfur modified petrol coke adsorbents[J]. Chemical Industry and Engineering Progress, 2018, 37(05): 1908-1915.

李娜, 韦红旗, 段钰锋, 王晨平, 佘敏, 胡鹏, 王双群. SO₂与O₂对硫改性石油焦吸附剂脱汞性能的影响[J]. 化工进展, 2018, 37(05): 1908-1915.

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Effects of SO₂ and O₂ on Hg⁰ removal capacity of sulfur modified petrol coke adsorbents

SO₂与O₂对硫改性石油焦吸附剂脱汞性能的影响

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