Search | Engineering

Subscribe Submit

Home Journals Focus Achievement Fronts About Us 中文版

Resource Type

Journal Article 142

Conference Videos 11

Year

2023 8

2022 12

2021 15

2020 11

2019 3

2018 4

2017 6

2016 1

2015 6

2014 13

2013 6

2012 11

2011 7

2010 3

2009 6

2008 20

2007 14

2006 1

2004 2

2003 1

open ︾

Keywords

adsorption 5

catalytic activity 3

polyvinylidene fluoride 3

temperature 3

CO oxidation 2

activation 2

calcination temperature 2

catalytic 2

hexagonal 2

preparation 2

regeneration 2

solid state reaction 2

13X-type zeolite 1

2-ethylhexyl 1

2-hydroxyethyl 1

3D printing 1

3T3-L1 preadipocyte 1

In situ pyrolysis 1

N-methoxyl carbazole 1

open ︾

Search scope:

排序： Display mode:

Edge preparation methods for cutting tools: a review

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0766-y

Abstract: Edge preparation can remove cutting edge defects, such as burrs, chippings, and grinding marks, generatedVarious edge preparation methods have been proposed for different tool matrix materials, geometries,This study presents a scientific and systematic review of the development of tool edge preparation technologyThen, edge preparation methods for cutting tools, in which materials at the cutting edge area are removedFinally, the future development direction of tool edge preparation technology is prospected.

Keywords： edge preparation method preparation principle cutting edge geometry edge characterization tool performance

HTML PDF Collect

The effect of preparation conditions of Pt/Al

Lei YUAN, Xiang ZHENG, Kaijiao DUAN, Hao HU, Jinggang WANG, Seong Ihl WOO, Zhiming LIU

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 3, Pages 457-463 doi: 10.1007/s11783-013-0512-5

Abstract: Catalyst preparation conditions exert significant influence on the catalytic performance, and the catalyst

Keywords： NO_x reduction Pt/Al₂O₃ preparation condition H

HTML PDF Collect

Selective preparation for biofuels and high value chemicals based on biochar catalysts

Frontiers in Energy 2023, Volume 17, Issue 5, Pages 635-653 doi: 10.1007/s11708-023-0878-4

Abstract: The topics mainly include the modification of biochar catalysts, the preparation of energy products,This paper identifies the latest preparation for energy products and other high-value chemicals based

Keywords： biomass biochar catalysts biofuels high chemicals

HTML PDF Collect

A highly efficient methodology for the preparation of

Yongxin Zhang, Shucheng Wang, Yaodong Huang

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 3, Pages 679-686 doi: 10.1007/s11705-020-1979-9

Abstract: A convenient and highly efficient method is described for the synthesis of -methoxycarbazole derivatives, including those with sterically demanding, benzannulated, or strongly electron-donating or -withdrawing substituents. Various -methoxycarbazole derivatives were directly prepared in good-to-moderate yields by the Pd (dba) CHCl /9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene-catalyzed reactions of the corresponding dibromobiphenyl compounds and methoxya-mine. Based on this methodology, the first total synthesis of 3,3′-[oxybis(methylene)]bis(9-methoxy-9 -carbazole), an antimicrobial dimeric carbazole alkaloid previously isolated from the stem bark of , was achieved in 18% yield over seven steps from 1,2-dibromobenzene.

Keywords： N-methoxyl carbazole dimeric N-methoxyl carbazole alkaloid total synthesis double N-arylation of methoxyamine

HTML PDF Collect

Kinetics of pozzolanic reaction for preparation of flue gas desulfurizer from fly ash and Ca(OH)2

WANG Jingang, HU Jinbang, WANG Daobin, DUAN Zhenya

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3, Pages 266-270 doi: 10.1007/s11705-007-0048-y

Abstract: A kinetic model of the pozzolanic reaction for the preparation of flue gas desulfurizers from fly ash

Keywords： comparison calculated pozzolanic reaction precision preparation

HTML PDF Collect

preparation of Ag@AgCl/Bio-veins composites and their photocatalytic activity and recyclability

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 7, Pages 906-917 doi: 10.1007/s11705-022-2273-9

Abstract: The industrial application of nano-photocatalysts in wastewater treatment has been severely restricted for a long time due to their difficult separation, poor reusability, and low efficiency. In this work, a facile strategy was proposed to enhance the photocatalytic activity and recovery performance of Ag@AgCl nanocatalysts. Biological veins (Bio-veins) with a unique 3D porous construction were used as carriers for the in-situ growth of Ag@AgCl nanoparticles. Scanning electron microscopy results showed that the Ag@AgCl nanoparticles were uniformly loaded on the surface and interior of the Bio-veins, and the size of the Ag@AgCl nanoparticles immobilized on the Bio-veins (50–300 nm) was significantly smaller than Ag@AgCl obtained by the co-precipitation method (1–3 μm). The Bio-veins played a vital role in the photocatalysis reaction system. The degradation efficiency of the Ag@AgCl/Bio-veins(CI4) was up to 3.50 times as high as pure Ag@AgCl. Furthermore, the composites also exhibited excellent recyclability and stability under both visible and solar light. This work provided a suitable strategy for nano-photocatalysts for practical application and may also offer new possibilities for the high-value utilization of biomass materials.

Keywords： Ag@AgCl biological veins photocatalytic activity recyclability

HTML PDF Collect

Effect of preparation parameters on catalytic properties of Pt/graphite

LIU Zhengqian, MA Jun, ZHAO Lei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 4, Pages 482-487 doi: 10.1007/s11783-007-0077-2

Abstract: Catalytic ozonation of aqueous solutions of oxalic acid was examined in the presence of graphite-supported platinum catalysts. The catalytic activity of graphite was significantly enhanced by loading platinum. The removal efficiency of oxalic acid was 3.0%, 47.6% and 99.3% for ozonation alone, graphite catalytic ozonation and Pt/graphite catalytic ozonation in 30 min under the experimental condition, respectively. The influence of support pretreatment, solvent, impregnation time, platinum loading amount and reduction temperature on the activity of Pt/graphite catalyst was investigated. The pretreatment of graphite support had no effect on activity improvement of Pt/graphite catalyst. Solvent and impregnation time also had no great effect on the activity. Platinum loading amount and reduction temperature influenced the catalyst activity significantly. The optimal catalytic performance of Pt/graphite was obtained when 1.0% platinum loading and 623 K of reduction temperature was adopted. The Pt/graphite catalyst was used for five times with no significant decrease in its activity and more than 90% oxalic acid removal was obtained.

HTML PDF Collect

Preparation and application of magnetic microsphere carriers

ZHANG Bo, XING Jianmin, LIU Huizhou

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1, Pages 96-101 doi: 10.1007/s11705-007-0019-3

Abstract: In this paper, preparation methods, surface modification and application of magnetic carriers are reviewed

Keywords： microsphere biomedicine DNA purification preparation

HTML PDF Collect

Reactive extraction for preparation of hydrogen peroxide under pressure

CHENG Yongxi, LI Hongtao, WANG Li, LÜ Shuxiang

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3, Pages 335-340 doi: 10.1007/s11705-008-0042-z

Abstract: The preparation of hydrogen peroxide from anthrahydroquinone by reactive extraction was investigated.

HTML PDF Collect

Review on design, preparation and performance characterization of gelled fuels for advanced propulsion

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6, Pages 819-837 doi: 10.1007/s11705-021-2122-2

Abstract: This review provides an overview on design, preparation and performance characterization of gelled fuelsThe composition, preparation process and gelation mechanism of gelled high-energy-density fuels are described

Keywords： gelled fuels high-energy-density fuels rheological properties atomization combustion

HTML PDF Collect

Nanostructured hollow spheres of hydroxyapatite: preparation and potential application in drug delivery

Xiaojing ZHANG, Weixin ZHANG, Zeheng YANG, Zhao ZHANG

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 3, Pages 246-252 doi: 10.1007/s11705-012-1299-9

Abstract: A solvothermal method has been successfully used to prepare nanostructured hydroxyapatite (HA) hollow spheres with average diameters of about 500 nm and shell thicknesses of about 100 nm in a glycerin/water mixed solvent. Transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FESEM) images show that the shells of the HA hollow spheres are actually composed of nanosheets with thicknesses of about 10 nm. By tuning the glycerin/water volume ratio, two other kinds of HA solid spheres with average diameters of about 6 or 20 μm were assembled from nanoflakes. The properties of the different kinds of spheres as drug delivery carriers were evaluated. Ibuprofen (IBU) was chosen as the model drug to load into the HA samples. The nanostructured HA samples showed a slow and sustained release of IBU. The HA hollow spheres exhibited a higher drug loading capacity and more favorable release properties than the HA solid spheres and thus are very promising for controlled drug release applications.

Keywords： hydroxyapatite hollow spheres synthesis drug release

HTML PDF Collect

Preparation and adsorption performances of mesopore-enriched bamboo activated carbon

WANG Yuxin, LIU Congmin, ZHOU Yaping

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4, Pages 473-477 doi: 10.1007/s11705-008-0081-5

Abstract: Activated carbon with high specific surface area and considerable mesopores was prepared from bamboo scraps by phosphoric acid activation. The effect of activation conditions was studied. Under the conditions of impregnating bamboo with 80% HPO at 80°C for 9 days and activation at 500°C for 4 h, the prepared activated carbon had the highest mesopore volume of 0.67 cm/g, a specific surface area of 1567 m/g, and the mesopore ratio reached 47.18%. The study on adsorption isotherms of CH, CO, N and O on the activated carbon were carried out at 298 K. The considerable difference in the adsorption capacity between CO and the other gases was observed, which would be of interest for the adsorptive separation/purification of gaseous CO from its mixtures, especially from mixtures with N and/or O.

Keywords： mesopore volume gaseous considerable difference adsorption capacity activation

HTML PDF Collect

Preparation and characterization of

Chunhua XU, Dandan CHENG, Baoyu GAO, Zhilei YIN, Qinyan YUE, Xian ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4, Pages 455-462 doi: 10.1007/s11783-010-0275-1

Abstract: Batch adsorption experiments were conducted to explore the adsorption of Cr(VI) in aqueous solutions by -FeOOH-coated sand. We investigated the key factors which affected the adsorption process such as adsorbent dosage, initial pH, initial Cr(VI) ion concentration, contact time and temperature. The uptake of Cr(VI) was very rapid and 44.3%, 51.6%, 58.9% of the adsorption happened during the first 180 minutes at 293K, 303K and 313K, respectively. The pseudo-second-order rate equation successfully described the adsorption kinetics. To study the adsorption isotherm, two equilibrium models, the Langmuir and Freundlich isotherms, were adopted. At 293K, 303K and 313K, the adsorption capacities obtained from the Langmuir isotherm were 0.060, 0.070 and 0.076 mg Cr(VI) per gram of the adsorbent, respectively. Thermodynamic parameters such as the change of energy, enthalpy and entropy were calculated using the equilibrium constants. The negative value of and the positive value of showed that the adsorption of Cr(VI) in aqueous solutions by -FeOOH-coated sand was spontaneous, endothermic and occurred by physisorption.

Keywords： β-FeOOH-coated sand Cr(VI) adsorption isotherm kinetics

HTML PDF Collect

Preparation and characterization of lithium

Chang WANG,Yanlong ZHAI,Xi WANG,Ming ZENG

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 4, Pages 471-477 doi: 10.1007/s11705-014-1449-3

Abstract: The effects of the calcination time and temperature on the preparation of the LiMn O precursor and the

Keywords： lithium ion-sieve solid state reaction adsorption LiMn₂O₄

HTML PDF Collect

A simple and cheap method for preparation of coupled ZrO2/ZnO with high photocatalytic activities

WANG Zheng, ZHANG Bingru, LI Fengting

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 4, Pages 454-458 doi: 10.1007/s11783-007-0072-7

Abstract: The objective of this study was to prepare a new photocatalyst with high activities for degradation of organic pollutants. Coupled ZrO/ZnO photocatalyst was prepared with a simple precipitation method with cheap raw

Keywords： objective ZrO/ZnO photocatalyst photocatalyst precipitation degradation