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Vanadium(IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 56-67 doi: 10.1007/s11705-022-2185-8

Abstract: conditions of pH 0.8, di-(2-ethylhexyl)phosphoric acid concentration of 20%, phase ratio of 1:2, and extractiontime of 8 min, the vanadium extraction could reach 80.00%.reveal that, despite the fact that the chloride ion in the leachate could significantly promote vanadium extractionethylhexyl)phosphoric acid also enter the water phase more easily, which reduces the pH required for the extraction

Keywords： vanadium     black shale     solvent extraction     high acidity extraction    

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Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Frontiers in Energy   Pages 763-774 doi: 10.1007/s11708-023-0897-1

Abstract: Herein a series of microporous and mesoporous zeolites were used to study the influence of porosity and acidityIt was observed that H-Beta zeolite was an efficient catalyst for cracking high-density polyethyleneThe effect of porosity and acidity on catalytic performance of zeolites was evaluated, which clearlyvisualized the good performance of H-Beta due to high surface area, large channel system, large amount

Keywords： plastics conversion     polyethylene     zeolites     acidity     porosity    

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Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1723-z

Abstract:

● Au, Ag and Pd were recovered from WPCBs with high efficiencies.

Keywords： Thiosulfate     Printed circuit boards     Precious metals     Leaching     Hydrometallurgy    

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Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solventextraction-precipitation process

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 5,   Pages 902-912 doi: 10.1007/s11705-019-1887-z

Abstract: High-manganese containing vanadium wastewater (HMVW) is commonly produced during the vanadium extractionefficient and environmentally friendly method was developed to recover valuable metals by using a solvent extraction-precipitationIn the solvent extraction process, 98.15% of vanadium was recovered, and the V O product, with a purity

Keywords： high-manganese containing vanadium wastewater     solvent extraction     carbonate precipitation     vanadium titano-magnetite    

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Precise regulation of acid pretreatment for red mud SCR catalyst: Targeting on optimizing the acidity

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1447-x

Abstract:

• The optimum SCR activity was realized by tuning the acid pretreatment.

Keywords： Air pollution control     Nitrogen oxides     Selective catalytic reduction     Red mud     Solid waste utilization    

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Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 224-231 doi: 10.1007/s11705-014-1447-5

Abstract: Considering its intrinsic weak acidity, MCM-41 was modified by a simple impregnation method to incorporateThe incorporation of Al components resulted in the high dispersion of Cu species and the increase of

Keywords： MCM-41     acidity     oxidative carbonylation     diethyl carbonate    

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Entity and relation extraction with rule-guided dictionary as domain knowledge

Frontiers of Engineering Management   Pages 610-622 doi: 10.1007/s42524-022-0226-0

Abstract: Entity and relation extraction is an indispensable part of domain knowledge graph construction, whichThe existing entity and relation extraction methods that depend on pretrained models have shown promisingEntity extraction models treat characters as basic semantic units while ignoring known character dependencyRelation extraction is based on the hypothesis that the relations hidden in sentences are unified, therebyIn addition, the extraction accuracy of entity relation triplet reaches 83% and 76% on laser industry

Keywords： entity extraction     relation extraction     prior knowledge     domain rule    

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A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1633-0

Abstract:

● pz-UiO-66 was synthesized facilely by a solvothermal method.

Keywords： Pyrazine     Metal-organic frameworks     Copper removal     Strong acidity     High selectivity    

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Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 5,   Pages 516-524 doi: 10.1007/s11705-022-2238-z

Abstract: Herein, we report devices with high power conversion efficiency (9.16%) by introducing graphene oxideThis work provides a promising strategy to optimize the crystallization process and boost charge extractionat the surface/interface optoelectronic properties of perovskites for high efficient and low-cost solar

Keywords： all inorganic     perovskite solar cells     graphene oxide quantum dots     high performance     stability    

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Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 82-92 doi: 10.1007/s11705-022-2181-z

Abstract: The amination of alkyl alcohols is one of the most promising paths in synthesis of aliphatic amines. Herein, cerium doped nickel-based catalysts were synthesized and tested in a gas-phase amination of n-hexanol to n-hexylamine. It was found that the activity of the Ni/γ-Al2O3 catalyst is significantly improved by doping an appropriate amount of cerium. The presence of cerium effectively inhibits the agglomeration of nickel particle, resulting in better Ni dispersion. As Ni particle size plays critical role on the catalytic activity, higher turnover frequency of n-hexanol amination was achieved. Cerium doping also improves the reduction ability of nickel and enhances the interactions between Ni and the catalyst support. More weak acid sites were also found in those cerium doped catalysts, which promote another key step—ammonia dissociative adsorption in this reaction system. The overall synergy of Ni nanoparticles and acid sites of this Ni–Ce/γ-Al2O3 catalyst boosts its superior catalytic performance in the amination of n-hexanol.

Keywords： amination     alcohol     cerium     nickel     acidity     interaction    

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Effects of support acidity on the reaction mechanisms of selective catalytic reduction of NO by CH

Shicheng XU, Junhua LI, Dong YANG, Jiming HAO

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 2,   Pages 186-193 doi: 10.1007/s11783-009-0016-5

Abstract: Catalysts derived from different supports would lead to different reaction pathways, and the aciditythe active surface NO species and the corresponding reaction routes were determined by the overall acidityspecies and activated hydrocarbon intermediates should be realized by modification of the support acidity

Keywords： selective catalytic reduction (SCR)     nitric oxide (NO)     methane     support acidity     Br?    

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High-end equipment customer requirement analysis based on opinion extraction

Yuejin TAN, Yuren WANG, Xin LU, Mengsi CAI, Bingfeng GE

Frontiers of Engineering Management 2018, Volume 5, Issue 4,   Pages 479-486 doi: 10.15302/J-FEM-2018035

Abstract: Acquisition and analysis of customer requirements are the essential steps in high-end equipment design

Keywords： requirement analysis     opinion extraction     high-end equipment     new energy vehicle    

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An extraction- assay system: Evaluation on flavonols in plant resistance to Pb and Cd by supercriticalextraction- gas chromatography

Xu Zhang, Huanhuan Yang, Xinlei Wang, Wen Song, Zhaojie Cui

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 4, doi: 10.1007/s11783-018-1059-2

Abstract:

SFE-GC system is established for flavonols assessment.

Optimal parameters of SFE-GC are evaluated and determined.

Quercetin and kaempferol are detected in plant under heavy metal stress.

Gene expression analysis shows consistent regularity with content of flavonols.

ROS level is applied for elaborating the plant resistance status.

Keywords： Flavonols     Heavy metal     Supercritical carbon dioxide extraction (SFE)     GC     Plant resistance    

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Feature extraction from slice data for reverse engineering

ZHANG Yingjie, LU Shangning

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 25-31 doi: 10.1007/s11465-007-0004-z

Abstract: A new approach to feature extraction for slice data points is presented.

Keywords： feasibility     corresponding     B-spline     pre-determined tolerance     extraction    

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A microextraction approach for rapid extraction and separation of Mn(II) and Co(II) using saponified

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 963-972 doi: 10.1007/s11705-021-2081-7

Abstract: In this paper, we proposed a microextraction approach for the extraction and separation of Mn(II) andThe results showcased that the microextractor can reach the extraction equilibrium within 20 s, therebygreatly reducing necessary extraction time comparing to that of conventional processes.microextraction approach greatly enhances the mass transfer while enabling a continuous and controllable extraction

Keywords： extraction equilibrium     mass transfer coefficient     microextraction     multicomponent extraction     di-(2-    

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Title Author Date Type Operation

Vanadium(IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with

Journal Article

Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Journal Article

Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit

Journal Article

Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solventextraction-precipitation process

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

Journal Article

Precise regulation of acid pretreatment for red mud SCR catalyst: Targeting on optimizing the acidity

Journal Article

Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Journal Article

Entity and relation extraction with rule-guided dictionary as domain knowledge

Journal Article

A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

Journal Article

Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified

Journal Article

Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Journal Article

Effects of support acidity on the reaction mechanisms of selective catalytic reduction of NO by CH

Shicheng XU, Junhua LI, Dong YANG, Jiming HAO

Journal Article

High-end equipment customer requirement analysis based on opinion extraction

Yuejin TAN, Yuren WANG, Xin LU, Mengsi CAI, Bingfeng GE

Journal Article

An extraction- assay system: Evaluation on flavonols in plant resistance to Pb and Cd by supercriticalextraction- gas chromatography

Xu Zhang, Huanhuan Yang, Xinlei Wang, Wen Song, Zhaojie Cui

Journal Article

Feature extraction from slice data for reverse engineering

ZHANG Yingjie, LU Shangning

Journal Article

A microextraction approach for rapid extraction and separation of Mn(II) and Co(II) using saponified

Journal Article