发布时间：

2025-04-30

论文名称：

Removal of HCN by using activated carbon: the effect of adsorption condition and chemical modification

发表刊物：

Journal of Biobased Materials and Bioenergy

摘要：

Hydrogen cyanide (HCN) is an extremely toxic gas widely existing in many chemical industries and also the predominant precursor of NOx formation in coal combustion. In the present work, the activated carbons (ACs) are used to remove HCN from model coal pyrolysis. The effects of adsorption conditions including temperature, sorbent quantity, flow rate and coexisting gas (NO, SO2 and O2) are studied, and the effect of ACs chemical modification (NaOH/HCl/H2O2/CaCl2/MgCl2) is particularly considered. The results show that the capacity of ACs adsorbing HCN generally increases with the increasing in temperature in the range of 40-120oC and there is an optimum temperature around 100oC for the longest breakthrough time. The breakthrough time of ACs adsorbing HCN increases with increasing in ACs quality and residual time but decreases with increasing in HCN concentration. The introduction of trace SO2 inhibits HCN adsorption due to the competition with HCN on surface active sites while trace NO improves HCN adsorption markedly, and an oxidizing environment (O2, 3%) suppresses HCN adsorption. The chemical modification of NaOH impregnation significantly enhances HCN adsorption on carbon surfaces by producing more alkali active sites, and H2O2 also enhances HCN adsorption but HCl inhibits this process. The effect of impregnation concentration of metal ions on HCN adsorption shows a parabolic relation, and there is an optimum doping concentration for the largest adsorption capacity that is 2% and 5% for MgCl2 and CaCl2 respectively. These results indicate that a suitable temperature and metal doping concentration, environmental gas and alkaline modification are important for HCN removal by activated carbon adsorption.

合写作者：

Xuebin Wang; Xinmin Wang; Houzhang Tan

卷号：

9（6）

页面范围：

545-552

是否译文：

否

发表时间：

2015-12-24