RSC Advances
·
2022
·Vol. 12
·期 52
·33716-33724
·
IF 4.036
Jie Hu,Lei Li,Hao Li,Ying Zhai,Fushun Tang,Zhe Zhang,Banglin Chen
The mixed bimetal metal–organic framework Ni0.37Co0.63-MOF-74 has been constructed by the solvothermal method for NO adsorption. The results showed that bimetal Ni0.37Co0.63-MOF-74 takes up NO with a capacity of up to 174.3 cc g−1 under ambient conditions, which is 16.3% higher than that of the best single metal Co-MOF-74. The IAST adsorption selectivity for a NO/CO2 binary mixture can reach a maximum of 710 at low adsorption partial pressure, while the regeneration performance can be retained even after five cyclic adsorption–desorption experiments. Its separation performance was further confirmed by breakthrough experiments, indicating this new bimetal Ni0.37Co0.63-MOF-74 as one of the best materials for NO adsorption and separation in flue gas.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Runping Wu,Qing Ye,Kai Wu,Shuiyuan Cheng,Tianfang Kang,Hongxing Dai
The alkali metal (M = Na, K, Rb, and Cs)-modified C-FDU-15 (M-C-FDU-15( x ); x was the M/C-FDU-15 M ratio, and equal to 0.01–0.03) samples were prepared through an in situ process, and characterized by means of the TG, XRD, TEM, EDS, N 2 adsorption–desorption, O 2 -TPD, and CO 2 -TPD techniques. The (NO + O 2 ) adsorption mechanism was investigated using the (NO + O 2 )-TPD and DRIFTS techniques. The results show that the sequence of (NO + O 2 ) adsorption performance was Na-C-FDU-15(0.01) (104.1 mg/g) > K-C-FDU-15(0.01) (92.4 mg/g) > C-FDU-15 (76.2 mg/g) > Rb-C-FDU-15(0.01) (65.1 mg/g) > Cs-C-FDU-15(0.01) (62.3 mg/g). The alkali metal was uniformly distributed in C-FDU-15 and its doping enhanced the amount of the basic sites in the sample. Moreover, the optimal Na/C-FDU-15 M ratio was 0.02. (NO + O 2 ) were chemically adsorbed mainly in the forms of nitrite (NO 2 − ) and nitrate (NO 3 − ) on M-C-FDU-15( x ). A more amount of NO was converted to nitrate than to nitrite. There were three key factors of enhancing the (NO + O 2 ) adsorption capacity of C-FDU-15 due to alkali metal doping: the first factor was the increasing of surface area and pore volume of the sample, the second one was the enhancement in amount of the active sites in the sample, and the third one was the smaller alkali metal ionic radius in the sample.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Runping Wu,Qing Ye,Kai Wu,Hongxing Dai
To improve the removal capacity of NO + O 2 effectively, the alkaline earth metal-doped order mesoporous carbon (A-C-FDU-15(0.001) (A = Mg, Ca, Sr and Ba)) and Mg-C-FDU-15( x ) ( x = 0.001−0.003) samples were prepared, and their physicochemical and NO + O 2 adsorption properties were determined by means of various techniques. The results show that the sequence in (NO + O 2 ) adsorption performance was as follows: Mg-C-FDU-15(0.001) (93.2 mg/g) > Ca-C-FDU-15(0.001) (82.2 mg/g) > Sr-C-FDU-15(0.001) (76.1 mg/g) > Ba-C-FDU-15(0.001) (72.9 mg/g) > C-FDU-15 (67.1 mg/g). Among all of the A-C-FDU-15(0.001) samples, Mg-C-FDU-15(0.001) possessed the highest (NO + O 2 ) adsorption capacity (106.2 mg/g). The species of alkaline earth metals and basic sites were important factors determining the adsorption of NO + O 2 on the A-C-FDU-15( x ) samples, and (NO + O 2 ) adsorption on the samples was mainly chemical adsorption. Combined with the results of (NO + O 2 )-temperature-programmed desorption ((NO + O 2 )-TPD) and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) characterization, we deduced that there were two main pathways of (NO + O 2 ) adsorption: one was first the conversion of NO and O 2 to NO 2 and then part of NO 2 was converted to NO 2 − and NO 3 − ; and the other was the direct oxidation of NO to NO 2 − and NO 3 − .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Han Wang,Shulan Wang,Jingqiao Zhang,Han Wang,Hui Li,Yi Zhao
Several mesostructured cellular foams (MCFs) were prepared and modified for NO adsorption. TMB, NH 4 F and n -heptane were used as swelling agents, and APTES was used as the modified agent. The morphological structure, chemical composition, thermostability were tested to study the effects of the preparation process on the characterizations of materials. NO adsorption ability of the materials were studied and discussed. NH 4 F and n -heptane had better pore swelling effects compared to TMB, however adding TMB together with NH 4 F and n -heptane could not enlarge the pore structure further. The MCFs materials could keep steady below 800 °C, but after grafting APTES on the surface of the materials, the thermogravimetric curve of materials began to decrease at 300 °C. The materials using NH 4 F and n -heptane as the swelling agents, and modified by APTES had better NO adsorption ability, and the selectivity of the materials were decided by the molecular polarity of the adsorbates. After the modification, the hydrophobic effect of the samples could increase because of the alkyl groups in APTES. The adsorption capacity of the materials could keep steady for ten times without the coexisting component, H 2 O, CO 2 and SO 2 all had negative effects on the regeneration of the materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Wang Shuainan,Sheng Hongliang,Zhao Xiaoben,He Tao,Huang Yajun,He Song
The present investigation involved the preparation of N-doped high-specific surface porous activated carbon from lignin through hydrothermal carbonization, polymer premixing, and KOH activation. We looked at how the characteristics of lignin-based activated carbon were affected by the addition of polypyrrole and the alkali ratio. The addition of polymer polypyrrole as an N dopant during the activation process with KOH resulted in the N-doped biomass-based activated carbon with a greater pore size range, specific surface area, and pore volume, while also further encouraging the pore creation. Under the optimal preparation conditions, specifically hydrothermal treatment at 473 K and activation at 1073 K for 1 h, with a mass ratio of activator to carbon precursor of 4:1, the resulting activated carbon exhibited the highest BET surface area of 3415 m 2 /g and a total pore volume of 2.81 cm 3 /g. The various characteristics of activated carbon are examined using N 2 adsorption/desorption, scanning electron microscopy (SEM), elemental analysis (EA), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). Comparing this sample to other adsorbents, it was found that the material had a greater capacity for adsorbing gaseous benzene and NO. In static adsorption tests, the saturated adsorption of gaseous benzene reached 3338.75 and 2297.69 mg/g at 273 and 298 K, respectively, while the adsorption of NO reached 560.76 and 226.99 mg/g. Adsorption isotherms were used to analyze the experimental results, which were then fitted, examined, and assessed to look into the adsorption mechanism. The outcomes demonstrated the good adsorption performance of this sample as well as its promising and useful application potential in the removal of gaseous benzene and NO. Graphical
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhongwei Li,Guochang Song,Xingyu Yang,Qiang Song
Activated carbon can be used to control NO x emissions in low-temperature flue gas, while improving its performance is challenging. NO adsorption on activated carbon was found significantly promoted with the presence of O 2 . Based on the analysis of NO adsorption characteristics under different atmospheres and corresponding desorption characteristics, NO oxidation, NO 2 migration and further conversion on activated carbon are proposed to cause the significant increase in NO adsorption capacity. Quantum chemical calculations conducted on the adsorption and reaction pathways of NO, O 2 , and NO 2 on different carbonaceous models clarified that the pathway of O 2 -promoted NO adsorption on activated carbon can be divided into two stages. In the first stage, O 2 adsorbs on active carbon atoms near the hydroxyl functional group and undergoes an oxidation reaction with gaseous NO to generate NO 2 . In the second stage, the desorbed NO 2 is re-absorbed on the saturated carbon atoms; the N-down adsorption configuration of NO 2 will not convert, while the O-down adsorption configuration of NO 2 will oxidize the active site to form C-O and release NO; the C-O further reacts with the gaseous NO 2 to form NO 3 - which stably remains. There are two types of active sites involved in the pathway. The active carbon atoms near the hydroxyl functional groups mainly play a catalytic role in the oxidation of NO, while the saturated carbon atoms mainly store nitrogen-containing components. The results can help improve the performance of activated carbon in adsorbing NO in low-temperature flue gas.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Bo Lin,Aiyong Wang,Yanglong Guo,Yuanqing Ding,Yun Guo,Li Wang,Wangcheng Zhan,Feng Gao
Co-, Ni-, and Zn-containing MOFs are prepared and then pyrolyzed to generate materials for ambient temperature NO adsorption. Materials containing Co are much more efficient for NO adsorption than those containing Ni and Zn; therefore, Co is identified as the active phase. The best performing material studied here achieves 100% low concentration (10 ppm) NO adsorption for more than 15 h under a weight hourly space velocity of 120 000 mL g–1 h–1. Powder X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared, and Raman spectroscopies, along with scanning electron microscopy and TEM, are used to probe the physicochemical properties of the materials, particularly the Co active phase, and chemistries involved in NO adsorption–desorption. NO adsorbs on oxygen-covered Co nanoparticle surfaces in the form of nitrates and desorbs as NO at higher temperatures as a result of surface nitrate decomposition. NO storage capacity decreases gradually upon repeated NO adsorption–desorption cycles, likely because of Co3O4 formation during these processes.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70148
·
IF 0
Han Zhang,Sisi Wang,Jingshu Ban,Hao Li,Le Ruan,Fushun Tang
In this paper, the NO adsorption performances of Ni-AIP MOF and Ni-AIP-BPY MOF synthesized by solvothermal method were compared, and the NO adsorption selectivity of two samples for the simulated flue gas conditions has also been studied. The results indicated that the Ni-AIP-BPY exhibited better NO adsorption performance with an NO adsorption capacity of 115.52 cc·g −1 at 100 kPa and ambient temperature and showed better adsorption selectivity with the highest adsorption selectivities of 937 and 10,691 for NO/CO 2 and NO/O 2 , respectively. Adsorption enthalpy calculations showed that Ni-AIP-BPY had a strong interaction force on NO, XPS and in-situ NO-FTIR results also confirmed that a strong adsorption occurred on the Ni metal center, and the main adsorptive products after NO adsorption were nitrate and nitrite. The introduction of a second ligand into the saturated coordination amine-containing complexes can improve the pore structure and coordination state of the materials, so that the complexes can activate unsaturated metal sites, thus significantly improving their adsorption and separation performance for NO gas molecules in flue gas. The results provided a new idea and understanding for the synthesis of materials for selective separation of NO components in flue gas.
研究领域:
环境科学
·
材料化学
✓ 已验证
产品关联
DOI
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Jiaman Wang,Jing Xiong,Zekai Cui,Yuanfeng Li,Hao Guo,Guilin Liu,Yaxiao Ma,Linsheng Xu,Jinqing Jiao,Jianping Zou,Yuechang Wei
CeO 2 , a pivotal rare earth oxide in environmental catalysis, has garnered extensive interest for soot oxidation owing to its exceptional oxygen storage capacity and oxygen vacancy-rich surfaces. To further optimize catalytic efficiency, we engineered spherical CeO 2 with exposed (111) facets via hydrothermal synthesis and uniformly anchored Pd species through a gas bubbling-assisted membrane reduction (GBMR) strategy. The formation of Pd–O–Ce interfacial units is identified as critical active sites, where metal-support interaction (MSI) significantly enhances oxygen transfer. Notably, the Pd 1.0 /CeO 2 catalyst achieves a remarkable T 50 of 356 °C (14% lower than pristine CeO 2 ), attributed to highly dispersed Pd species and abundant Pd–O–Ce interfaces. In contrast, excessive Pd species loading induces particle agglomeration, weakening MSI effect and catalytic performance. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional thoery (DFT) calculations reveal that the Pd–O–Ce interface promotes NO adsorption – the rate limiting step – by generating electron-rich Pd sites and oxygen vacancies, thereby accelerating NO-to-NO 2 conversion and subsequent soot oxidation. This work highlights the pivotal role of interfacial engineering in optimizing Pd–CeO 2 catalysts, offering a rational design strategy for high-performance soot oxidation systems in diesel emission control.
研究领域:
环境催化
·
材料科学
·
多相催化
·
排放控制
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）