JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
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IF 3.119
Tiantian Ping,Qinghai Long,Shufeng Shen
Solubility of N2O and CO2 in pure 2-butoxyethanol (2-BE) was determined in a stirred equilibrium cell at temperatures ranging from 283.2 to 333.2 K and correlated as an exponential function of temperature. Ratios of solubility of CO2 to N2O in several reported solvents were found to be strongly dependent on the order of solvent dielectric constants. Solubility of N2O in 2-(butylamino)ethanol (BAE) and the binary blends of 2-BE and BAE was measured over the temperature range from 283.2 to 333.2 K and with BAE concentration from 6.5 to 65.4 mass%. N2O solubility data were well represented by correlation models with AARDs within 0.8%. Physical solubility of CO2 in a nonaqueous 2-BE/BAE system can be estimated using the N2O analogy method.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2016
·
IF 3.349
Lulu Li,Qinglun Meng,Junjun Wen,Jingui Wang,Gaomei Tu,Chunhui Xu,Fumin Zhang,Yijun Zhong,Weidong Zhu,Qiang Xiao
Hierarchical Fe-ZSM-5 zeolites were directly synthesized from a zeolitic synthesis system in the presence of a silane coupling agent 3-glycidoxypropyltrimethoxysilane (GPTMS). The structure and morphology of the hierarchical Fe-ZSM-5 synthesized with different amount of GPTMS were characterized by XRD , SEM, TEM , and N 2 adsorption-desorption techniques. UV–vis and NH 3 -TPD were used to investigate the state of iron species and acidity, respectively. The steaming activated hierarchical Fe-ZSM-5 were used as catalysts in the direct oxidation of benzene to phenol (BTOP) with N 2 O as oxidant, showing an improved performance in terms of both activity and stability compared to Fe-ZSM-5 synthesized in the absence of GPTMS. A comparison study on the n -butane uptakes in Fe-ZSM-5 zeolites indicated the internal mass-transfer limitations of the hierarchical Fe-ZSM-5 zeolites were significantly improved.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
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2020
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IF 3.687
Yiqing Zeng,Zihua Wu,Lina Guo,Yanan Wang,Shule Zhang,Qin Zhong
The problems of easily inactivated by SO 2 poisoning and high N 2 O formation for MnO x based catalysts hinder its application in selective catalytic reduction (SCR) of NO x with NH 3 . The SO 2 poisoning mechanism has been well demonstrated, but the N 2 O formation mechanism was still controversial due to previous limited study. Herein, MnO 2 supported on MO x (Mn/M, M = Al, Si and Ti) were prepared by wet impregnation method to investigate the carrier effect on the formation of N 2 O. Although all of selected supports had a large amount of surface acid sites, only forming strong active-support interaction can separate the activation sites of NH 3 and NO + O 2 . Accordingly, the activation of NH 3 and NO + O 2 on MnTi was respectively occurred on TiO 2 and MnO 2 , but both NH 3 and NO + O 2 was activated on MnO 2 over MnAl and MnSi samples. The over-activation (NH 2 dissociated into NH) of NH 3 would be effectively inhibited when NH 3 activation was occurred on TiO 2 , thus it can significantly suppress the formation of N 2 O. In contrast, the NH 3 species would sharply decompose into NH on MnO 2 and then lead to the high amount of N 2 O. Finally, we proposed some methods that might effectively improve the selectivity of MnO x- based catalysts.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
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IF 5.3
Bin Kang,Runduo Zhang,Mengfei Guo,Xiaonan Guo,Zhaoying Di,Ying Wei,Jingbo Jia
In this study, series of Co/zeolites with diverse microporous structures were prepared and applied for N2O catalytic decomposition. The corresponding activities followed the order Co/Beta > Co/Mordenite > Co/ZSM-5 > Co/MCM-49 > Co/ZSM-23 > Co/ZSM-35 > Co/SSZ-13, while the yield of NO2 byproduct followed the order Co/ZSM-23 > Co/ZSM-35 > Co/MCM-49 > Co/Mordenite > Co/ZSM-5 > Co/Beta > Co/SSZ-13. Under conditions of 30 vol % N2O and GHSV = 30 000 h–1, the best performing sample (Co/beta) achieved a remarkable N2O conversion of 99.6% at 450 °C. In addition, the formation of NO2 byproduct was significantly inhibited with the corresponding concentration varying from 1063 ppm for Co/ZSM-23 to 82 ppm for Co/Beta. Physicochemical characterization of these as-prepared catalysts was performed including XRD, BET, H2-TPR, NH3-TPD, XPS, UV-vis-DRS, and it was found that zeolites with higher dimensionally porous apertures (3D) and larger pore sizes (12-membered ring, 12-MR) were conducive to introducing Co ions onto the zeolite framework through the pore channels and further locating them on ion-exchange sites to form active centers (Co2+). Furthermore, molecular dynamics simulation demonstrated that the higher pore dimensions and larger pore sizes are more beneficial for the N2O diffusion inside the pores and channels of zeolites and promote N2O decomposition.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
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IF 2.29
Hui Guo,Xiaoqin Shi,Shufeng Shen
Non-aqueous mixtures of monoethanolamine (MEA) with glycol ethers as low viscosity absorbents have potential advantages for CO 2 capture. In this work, physical solubility of N 2 O and CO 2 in glycol ethers (2-methoxyethanol and 2-ethoxyethanol) and their blends with MEA was measured and correlated at temperatures ranging from (293.15 to 333.15) K. Physical solubility of CO 2 in the blends was also estimated by N 2 O/CO 2 analogy method. A mathematic model based on the reaction mechanism was proposed to interpret the vapour-liquid equilibrium data for the systems of CO 2 /MEA/glycol ether solution. Results show that glycol ethers have greater ability to dissolve CO 2 than glycols and water. The apparent chemical equilibrium constant was obtained and correlated as a function of temperature by non-linear regression. The proposed model could reasonably fit the experimental data with an average absolute deviation within 10%. The heat of absorption of CO 2 in MEA/glycol ether systems was also calculated.
研究领域:
化学工程
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环境科学
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物理化学
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能源技术
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分离科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoxuan Su,Yiyu Wang,Qiang He,Xuebin Hu,Yi Chen
Agricultural production causes large amounts of pesticide residues into soil, disturbing soil denitrification and N 2 O emission. Recently, biochar amendment has been regarded as the effective way to stimulate soil denitrification and reduce N 2 O emission. However, the underlying mechanism has not been well understood. Here, the effects of biochar on denitrification and N 2 O emission in the chlorothalonil (CHT)-polluted soil were explored. Biochar (50 g kg −1 ) was added to soil at the beginning of the experiment, and CHT (5 and 25 mg kg −1 ) was repeatedly applied to soil at the 30-day interval for 105 days. The obtained results showed that CHT remarkably declined soil respiration rates (52–77%) and denitrification rates (50–56%), but increased N 2 O emissions by 820–1030%. After biochar application, however, soil denitrification rates were increased by 13–26%, and N 2 O emissions were declined by 442–809% compared with non-biochar spiked soils. A further mechanism study indicated that biochar remarkably promoted the activities of microbial electron transfer chain, electron transporters (complex I, II, III and cytochrome c), and four denitrifying reductases (NAR, NIR, NOR, NOS) in CHT-polluted soils, suggesting that electron transport and consumption capacities during denitrification were stimulated by biochar. Soil denitrification was thus improved and N 2 O emission was subsequently reduced. Furthermore, biochar significantly upregulated soil denitrifying gene abundances and increased denitrifiers abundances (i.e., Enterobacter and Pseudarthrobacter ). Overall, this work will promote the current understandings of molecular mechanisms through which N 2 O emission in pesticide contaminated soils responds to biochar remediation.
研究领域:
环境科学
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微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
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IF 2.631
Hui Li,Hui Guo,Yangyang Bian,Yue Zhao,Shufeng Shen
A mixture system of water-lean amino acid salts (AAS) using ethylene glycol (EG) as a solvent has potential use for CO 2 capture to reduce energy consumption. In this work, physicochemical properties such as density, viscosity and N 2 O solubility of potassium prolinate (ProK) or potassium lysinate (LysK) + water + EG solutions were measured over the temperature range from (303.15 to 353.15) K and molality range from (0.481 to 4.331) mol·kg −1 . Partially CO 2 loaded solutions were also investigated. Densities and viscosities of solutions increase with the increasing molality of AAS and CO 2 , but decrease with the increasing temperature. The use of EG in the aqueous AAS systems replacing water can substantially increase the N 2 O solubility. The Henry’s constants of N 2 O for water-lean AAS solutions were calculated and compared with those for aqueous AAS solutions. These experimental data of properties were correlated using empirical correlations as a function of temperature, molality of AAS and/or CO 2 . The experimental results and the predictions from the models matched well each other for both ProK-based and LysK-based water lean systems, with AAD within 0.12% for density, 2.36% for viscosity and 2.0% for N 2 O solubility respectively.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Xiangpeng Zeng,Yanyan Liu,Qingqing Wang,Haitao Ma,Xinlei Li,Qiang Wang,Qingxiang Yang
Physicochemical and toxicological characterization of leather tanning wastewater has been widely documented. However, few reports have examined the response of denitrification N 2 and N 2 O emissions in riparian sediments of tannery wastewater-receiving rivers. In this study, 15 N-nitrate labeling was used to reveal the effects of tanning wastewater on denitrification N 2 and N 2 O emission in a wastewater-receiving river (the old Mang River, OMR). OMR riparian sediments were highly polluted with total organic carbon (93.39 mg/kg), total nitrogen (5.00 g/kg) and heavy metals; specifically, Cr, Zn, Cd, and Pb were found at concentrations 47.3, 5.8, 1.6, 4.3, and 2.8 times that in a nearby parallel river without tanning wastewater input (the new Mang River, NMR), respectively. The denitrification N 2 emission rates (0.0015 nmol N · g −1 · h −1 ) of OMR riparian sediments were significantly reduced by 2.5 times compared with those from the NMR ( p < 0.05), but the N 2 O emission rates (0.31 nmol N · g −1 · h −1 ) were significantly increased (4.1 times, p < 0.05). Although the dominant nitrogen-transforming bacteria phylum was Proteobacteria in the riparian sediments of both rivers, 11 nitrogen-transforming bacteria genera in the OMR were found to be significantly enriched; five of these were related to pollutant degradation based on linear discriminant analysis (LDA > 3). The average activity of the electron transport system in the OMR was 6.3 times lower than that of the NMR ( p < 0.05). Among pollution factors, heavy metal complex pollution was the dominant factor driving variations in N 2 O emissions, microbial community structure, and electron transport system activity. These results provide a new understanding and reference for the treatment of tanning wastewater-receiving rivers.
研究领域:
环境科学
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微生物学
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生态学
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水质
✓ 已验证
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2023
·Vol. 153
·期 12
·3724-3733
·
IF 2.8
Tan Xiao,Chen Hao,Shi Libin,Lu Qinghua,Qi Suitao,Yi Chunhai,Yang Bolun
Hydroxyapatite (HAP) supported Rh, Fe, and Rh-Fe catalysts were prepared by impregnation, and the synergy effects between the catalyst and NTP (non-thermal plasma) on N 2 O catalytic decomposition were also investigated. CO 2 -TPD results show that HAP synthesized at high pH have a greater number of surface alkaline sites and promoted the adsorption of N 2 O. RhFe/HAP-11 catalyst exhibited 95.9% activity for the direct catalytic decomposition of N 2 O at 350 °C. Combining NTP with the RhFe/HAP-11 catalyst can significantly enhance the catalytic decomposition of N 2 O and greatly reduce the reaction temperature. The one-stage combination method enables the radicals generated by the plasma to participate in the reaction immediately on the catalyst surface, so it is more conducive to the N 2 O catalytic decomposition in the range of 150–200 °C. When NTP is applied, N 2 O conversion on RhFe/HAP-11 at 200 °C increases a lot from 7.1 to 90.0%. Graphical Abstract
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Hao Liu,Shan Yang,Jinxing Mi,Chuanzhi Sun,Jianjun Chen,Junhua Li
N2O and CO coexist in various industrial and mobile sources. The synergistic reaction of N2O and CO to generate N2 and CO2 has garnered significant research interest, but it remains extremely challenging. Herein, we constructed an atomically dispersed Rh-supported CeO2 catalyst with asymmetric Rh–O–Ce sites through gradient Rh 4d–O 2p–Ce 4f orbital coupling. This design effectively regulates the 4f electron states of Ce and promotes the electron filling of the O 3π* antibonding orbital to facilitate N–O bond cleavage. Near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) reveals that CO reacts with the surface-adsorbed O* generated by N2O decomposition through self-tandem catalysis, accelerating the rate-limiting step in N2O decomposition and activating the synergistic reaction of N2O and CO at temperatures as low as 115 °C. This work can guide the development of high-performance catalysts using the strategy of high-order orbital hybridization combined with the tandem concept to achieve versatile catalytic applications.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Nan Liu,Qi Chen,Xianwu Jiang,Jie Chen,Lidong Zhang,Jiaying Pan,Haiqiao Wei,Xingqian Mao
This work presents a three-stage hybrid nanosecond discharge (NSD) and direct current (DC) discharge assisted n -C 5 H 12 /O 2 /N 2 ignition with lower discharge energy and higher energy efficiency. The reaction rate coefficients between O 2 (a 1 Δ g ) and n -C 5 H 12 are updated by mass/Master equation simulation. The promotive ignition enhancement via reaction channel O 2 (a 1 Δ g ) + n -C 5 H 12 → C 5 H 10 + H 2 O 2 in the hybrid NSD/DC discharge is demonstrated. The results show that the ignition delay time of the three-stage hybrid plasma assisted ignition is 1–2 orders of magnitude shorter than that of the two-stage hybrid discharge when the reduced electric field strength in the DC discharge stage is over 10 Td. Meanwhile, the plasma-enhanced energy efficiency of three-stage hybrid discharge increases. This improved efficiency on ignition enhancement is due to the kinetic enhancement by the electronically excited species and radicals (O 2 (a 1 Δ g ), O( 1 D), N 2 (B) and O). The kinetic and thermal effects by plasma are effectively intergated to enhance ignition. However, more discharge energy deposited in the vibrationally excited states N 2 ( v ) in the two-stage hybrid discharge is less efficient on ignition enhancement due to the thermal contribution via vibrational-translational relaxation. In the aspect of NO x /N 2 O emissions, reduction efficiency of the three-stage hybrid discharge is two times higher than that of the two-stage hybrid discharge. By controlling the N/N( 2 D) production pathway e + N 2 → e + N + N( 2 D), the three-stage hybrid discharge reduces NO x and N 2 O production by 61.1 % and 90 %, respectively. The results show that the ignition delay time is non-monotonically dependent on the discharge pulse number. There exist optimal pulse number, reduced electric field and effective threshold power density of DC discharge to achieve maximum ignition enhancement and low NO x /N 2 O emissions. This study provides valuable insights into the use of NSD/DC hybrid discharge technology in advanced engines to achieve energy-efficient ignition enhancement and reduce NO x /N 2 O emissions.
研究领域:
能源科学
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环境科学
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化学动力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
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IF 2.004
Zhicheng Xu,Shujuan Wang,Changhe Chen
Densities of and N2O solubilities in aqueous solutions of 1,4-butanediamine (BDA), 2-(diethylamino)-ethanol (DEEA), and their aqueous mixtures were measured at (298.15, 313.15, and 333.15) K, and viscosities were measured at (298.15, 303.15, 313.15, 323.15, and 333.15) K. The experiments cover the mole fraction ranges (1.95–14.3 mol %) BDA, (2.01–19.3 mol %) DEEA, and (3.63–16.7 mol %) BDA + (2.62–22.2 mol %) DEEA in the blended solutions. The results were compared with available data in the literature. The experimental density and viscosity data were correlated using two semi empirical correlations in the literature as functions of temperature and concentration of BDA and DEEA.
研究领域:
化学工程
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物理化学
✓ 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）