Journal Article

Influences of fine-grained NaCl particles on performance and denitration efficiency of activated carbon during sintering flue gas purification process

Yao, Jiawen, Wong, Guojing, Chen, Xuling, Fan, Xiaohui, Gan, Min, Lv, Wei, Ji, Zhiyun, Tang, Qingyu

2019

Overview

Alkali metal chlorides emitted from sintering flue gas are easily adsorbed on the surface of activated carbon (AC) in the purification process. In this paper, NaCl particles adsorbing onto AC were simulated by impregnation method, and the size and morphology of NaCl particles were similar to those of NaCl-PM 10 emitted from sintering flue gas. With the adsorption of NaCl particles, 2–10-μm pores of AC were filled, and the specific surface area of AC decreased. But NaCl led to the increase of acidic functional groups on the surface of AC. When 0.75 wt% NaCl was adsorbed, it was beneficial for AC catalytic denitration (de-NOx), because the chemical reaction was strengthened by acidic functional groups, so it showed a certain promotion of de-NOx efficiency. As 1.5 wt% NaCl and 3 wt% NaCl were adsorbed, NaCl had an inhibitory effect on AC de-NOx, which was because the specific surface area of AC decreased, and the prevention of physical adsorption played a major role. As a result, the de-NOx efficiency of AC adsorbed with 3 wt% NaCl decreased from 40.59 to 23.02% at 150 °C. Therefore, the absorption of NaCl fine particles on AC should not exceed 0.75 wt%.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: absorption / Activated carbon / Activated sintering / Adsorption / Air Pollutants - chemistry / Air Pollutants - isolation & purification / Alkali metals / Aquatic Pollution / Atmospheric Protection/Air Quality Control/Air Pollution / Catalysis / catalytic activity / Charcoal - chemistry / Chemical reactions / Denitration / Earth and Environmental Science / Ecotoxicology / Efficiency / Environment / Environmental Chemistry / Environmental Health / Environmental science / Flue gas / Functional groups / Gases - chemistry / Industrial Waste / Metal chlorides / moieties / Morphology / Nitric Oxide - chemistry / Nitrogen oxides / Organic chemistry / Particulate matter / Purification / purification methods / Research Article / Sintering / Sodium chloride / Sodium Chloride - chemistry / Specific surface / Spectroscopy, Fourier Transform Infrared / Surface area / Surface chemistry / Waste Water Technology / Water Management / Water Pollution Control / X-Ray Diffraction