期刊
ENERGY & FUELS
卷 36, 期 14, 页码 7633-7650出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.2c00814
关键词
coal-based carbon; NOx adsorption; in situ DRIFTS; DFT; mechanism
资金
- National Natural Science Foundation of China [51906130]
- Natural Science Foundation of Shandong Province [ZR2019BEE053]
- Key R&D Program Funds of Shandong Province [2020CXGC011401]
- Foundation of Shandong Academy of Sciences for Young Scholars [2020QN009]
- Foundation of Shandong Key Lab of Energy Carbon Reduction and Resource Utilization, Shandong University [ECRRU201804]
A series of coal-based materials were prepared using a hydrothermal method combined with high-temperature CO2 activation. The surface functional groups and pore structure of the materials were optimized through K modification. The investigation found that optimizing the pore structure, functional groups, and surface metal can enhance the NOx adsorption capacity on the surface of the coal-based materials. Oxygen-containing active functional groups with moderately high C-O and R2C=O contents also contribute to the adsorption of NO. This study is significant for NOx adsorption removal technology.
A series of coal-based materials were prepared using a hydrothermal method combined with high-temperature CO2 activation. During sample preparation, K modification was performed to optimize the surface functional groups and pore structure. The NOx adsorption volume of each sample was evaluated in a simulated flue gas atmosphere. The physical and chemical parameters of the samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and temperature-programmed desorption of NOx and NO. In addition, the NOx adsorption mechanism of representative samples was explored by in situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculations. The adsorption capacity of NOx and SO2 with NOx was also systematically investigated using cyclic adsorption and co-adsorption experiments, respectively. The results showed that the optimized KOH concentration is 0.4 g KOH/30 mL H2O. At this concentration, the material had a relatively good pore structure and abundant surface functional groups. The investigation of the mechanism revealed that pore structure optimization is important for increasing the NOx adsorption capacity on the surface of the coal-based materials, followed by functional group and then surface metal optimization. In addition, oxygen-containing active functional groups with moderately high C-O and R2C=O contents can enhance the adsorption of NO to some extent. Optimizing the ratio of C-O to R2C=O is critical for NOx adsorption. This study is significant for NOx adsorption removal technology.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据