摘要
研究了浸渍 CuCl_2和 Cu(NO_3)_2溶液改性活性炭吸附/催化氧化低浓度 H_2S 的性能。通过表面 pH 测定和 BET 方法对活性炭的表面性质进行了表征,通过 X 射线衍射、X 射线光电子能谱及元素分析对吸附 H_2S发前后的活性炭试样进行了分析。实验结果表明,铜和氧在 H_2S 的吸附/催化氧化过程中都起到了重要作用,但浸渍铜盐的种类不同 H_2S 的转化途径也不同。浸渍CuCl_2后铜以多种形式固定下来,H_2S 在活性位和氧的作用下反应生成硫;浸渍 Cu(NO_3)_2后铜主要以 CuO 的形式固定在活性炭上,CuO 催化活化氧使 H_2S 被氧化生成硫、亚硫酸盐和有机硫,但同时 H_2S 与 CuO 反应生成 CuS 使催化剂失活。浸渍铜改性使活性炭的穿透硫容量增加。
Performances for both adsorption ＆ catalytic oxidation of low concentration H2S by activated carbon （AC） impregnated with CuCl2 and Cu （NO3）2 were studied. Surface properties of modified AC were determined by surface pH measurement and BET. Modified AC before and after H2S adsorption were characterized by means of XRD, XPS and elemental analysis. Copper and oxygen play critical roles in adsorption ＆ catalytic oxidation of H2S, and H2S transforming approaches differ with AC impregnated by different copper salts. Copper exists in several forms on AC impregnated with CuCl2. H2S transforms to sulfur on active sites by action of oxygen. But with impregnation of Cu（NO3 ）2 copper species deposited on AC is found to be CuO. Oxygen is activated by CuO and H2S is oxidized into sulfur, sulfite and organic sulfide. The catalyst deactivates when CuO reacts with H2 S to form CuS. It is found that H2 S breakthrough capacity of activated carbon multiplies after copper salt impregnation.
出处
《石油化工》
CAS
CSCD
北大核心
2008年第11期1195-1200,共6页
Petrochemical Technology
基金
中国石油天然气集团公司科学研究与技术开发项目(06B7301)
关键词
活性炭
浸渍
铜盐
改性
硫化氢
吸附
催化氧化
氧化铜
activated carbon
impregnation
copper salt
modification
hydrogen sulfide
adsorption
catalytic oxidation
copper oxide
作者简介
常化振（1983-），男，硕士生，电话0546—8393524，电邮changhuazhen_1@163．com。
联系人：赵朝成，电话0546-8392159，电邮zha08021@sina．com。
