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Poly(vinylidene fluoride--hexafluoro propylene) membranes prepared via thermally induced phase separation and application in direct contact membrane distillation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 720-730 doi: 10.1007/s11705-021-2098-y

Abstract: environmentally safe diluent, acetyl tributyl citrate, was employed to prepare poly(vinylidene fluoride)-<i>coi>-hexafluoropropylene membranes via thermally induced phase separation.

Keywords： poly(vinylidene fluoride)-<i>coi>-hexafluoropropylene     thermally induced phase separation     non-toxic    

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Bamboo-like -doped carbon nanotubes encapsulating M(Co, Fe)-Ni alloy for electrochemical production ofsyngas with potential-independent CO/H ratios

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 4,   Pages 498-510 doi: 10.1007/s11705-021-2082-6

Abstract: The electrochemical conversion of CO2-H2O into CO-H2 using renewableHerein, a series of <i>Ni>-doped carbon nanotubes encapsulating binary alloy nanoparticles (M<i>xi>Ni-NCNT, M= Fe, Co) were successfully fabricated through the co-pyrolysis of melamine andThe M<i>xi>Ni-NCNT samples exhibited bamboo-like nanotubular structures with a large specificon M<i>xi>Ni-NCNT.

Keywords： electrochemical reduction of CO2     syngas     <i>Ni>-doped carbon nanotubes     encapsulated alloynanoparticles     CO/H2 ratio    

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Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA

Shuna LI, Huawei YANG, Donghui ZHANG

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4,   Pages 472-481 doi: 10.1007/s11705-013-1351-4

Abstract: Cu(I)Y adsorbent was prepared by reduction of Cu(II)Y which was prepared by ion exchange between theThe dynamic adsorption capacity of Cu(I)Y for CO was calculated by adsorption breakthrough curve measuredon a fixed bed at 30°C and 0.006 MPa (g) of CO partial pressure.The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite.Then a five-bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated

Keywords： Cu(I)Y adsorbent     breakthrough curve     desorption     VPSA     simulation    

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NiBO (B = Mn or Co) catalysts for NH-SCR of NO at low-temperature in microwave field

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 8, doi: 10.1007/s11783-023-1696-y

Abstract:

● Microwave-assisted catalytic NH3-SCR reaction over spinel oxides is carried out.

Keywords： Microwave field     Spinel oxides     NO<i>xi>     Selective catalytic reduction    

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Co-conversion of methanol and

Shumei Wei, Yarong Xu, Zhaoyang Jin, Xuedong Zhu

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 5,   Pages 783-792 doi: 10.1007/s11705-019-1868-2

Abstract: The catalytic performances of the materials were evaluated during the co-feeding reaction of methanolThe benefit of using zeolite intergrowth in the co-conversion of methanol and alkanes offers a novel

Keywords： ZSM-5/ZSM-11     methanol     <i>ni>-hexane     cofeeding     aromatics    

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polarization strategy to deploy proton resource over atomic-level metal sites for highly selective CO

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1772-1781 doi: 10.1007/s11705-022-2197-4

Abstract: Unlocking of the extremely inert C=O bond during electrochemical CO2 reduction demands subtleThe as-designed catalyst displays a broad window (300 mV) for CO selectivity > 90% (98% maximum), evenThe well-placed control of proton dynamics by A/N-Fe can promote *COOH/*CO formation and simultaneouslymagnetic-proximity-induced exchange splitting (spin polarization) that properly adjusts energy levels of the Fe sites’ <i>di>-shells, and further those of the adsorbed intermediates’ antibonding molecular orbitals.

Keywords： CO2 electrolysis     single-atom catalysts     spin polarization     proton dynamics     <i>in situi    

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Carbon-coated Ni-Co alloy catalysts: preparation and performance for aqueous phase hydrodeoxygenation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 3,   Pages 443-460 doi: 10.1007/s11705-021-2079-1

Abstract: A charge transfer from Ni to Co appeared in the Ni-Co alloy.Compared with those of metallic Ni and Co, the <i>di>-band center of the Ni-Co alloy shifted away fromIn the <i>in-situi> aqueous phase hydrodeoxygenation of methyl palmitate with methanol as the hydrogenThe Ni-Co@C catalysts gave higher activity than the Ni@C and Co@C catalysts, and the yields of <i>ni>-pentadecane and <i>ni>-C6–<i>ni>-C16 reached 71.6% and 92.6%, respectively

Keywords： Stöber method     carbon-coated Ni-Co alloy     <i>in-situi> hydrodeoxygenation     methyl palmitate     decarbonylation    

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Process stability and microbial community composition in pig manure and food waste anaerobic co-digesters

Conor Dennehy, Peadar G. Lawlor, Gillian E. Gardiner, Yan Jiang, Paul Cormican, Matthew S. McCabe, Xinmin Zhan

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 3, doi: 10.1007/s11783-017-0923-9

Abstract: the effects of reducing hydraulic retention times (HRTs) from 21 days to 10.5 days when anaerobically co-digestingabundance of bacteria, which syntrophically degrade non-acetate volatile fatty acids (VFAs) into H and CO

Keywords： Biogas     Sequencing     <i>Clocamonaceaei>     <i>Spiorchatetesi>     Isobutyrate     Biosafety    

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Magnetic Co-doped 1D/2D structured -FeO/MoS effectively activated peroxymonosulfate for efficient abatement

Frontiers of Environmental Science & Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11783-024-1797-2

Abstract:

● Magnetic Co- <i> γ i>-Fe2O3/MoS2

Keywords： Magnetic Co-<i>γi>-Fe2O3/MoS2     Hydrothermal method     Bisphenol A     Degradation    

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On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11,   Pages 1741-1754 doi: 10.1007/s11705-023-2332-x

Abstract: Based on monolayer dispersion theory, Co3O4/ZSM-5 catalysts with different loadingsCo3O4 can spontaneously disperse on HZSM-5 support with a monolayer dispersionsub>–) and acid sites are crucial for the reaction, which can adsorb and activate NO<i>xi> and NH3 reactants effectively.capacity amount of Co3O4 onto HZSM-5 support.

Keywords： Co3O4/ZSM-5     NO<i>xi>-SCR by NH3     monolayer dispersion    

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Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes

Ran SHI,Hai WANG,Ping TANG,Yuezhen BIN

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 2,   Pages 171-178 doi: 10.1007/s11705-014-1428-8

Abstract: To improve the dispersibility of carbon nanotubes (CNTs), poly(vinylferrocene- -styrene) (poly(Vf- -St)), was grafted onto the surface of CNTs by a ligand-exchange reaction. Poly(Vf- -St) was obtained by a radical copolymerization reaction using styrene and vinylferrocene as the monomers. The vinylferrocene was synthesized from ferrocene via a Friedel-Crafts acylation. The molecular weight, molecular weight distribution, and amount of Vf in the poly(Vf- -St) were 1.32 × 10 , 1.69 and 17.6% respectively. The degree of grafting of the copolymer onto the CNTs surface was calculated from thermogravimetric analysis and varied from 27.1% to 79.7%. The addition of the poly(Vf- -St) greatly promoted the dispersibility of the modified CNTs in anhydrous alcohol. The electrical conductivity of composites prepared from the polymer-grafted CNTs and copolymer (acrylonitrile, 1,3-butadiene and styrene, ABS) strongly depended on the degree of grafting. These results show that the amount of polymer grafted onto the surface of CNTs can be controlled and that the electrical properties of composites prepared with these grafted polymers can be tuned.

Keywords： vinylferrocene     poly (Vf-<i>coi>-St)     CNTs     dispersibility    

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Improved Oxygen Evolution Kinetics and Surface States Passivation of Ni-Bi Co-Catalyst for Letter

Ke Dang,Tuo Wang,Chengcheng Li,Jijie Zhang,Shanshan Liu,Jinlong Gong

Engineering 2017, Volume 3, Issue 3,   Pages 285-289 doi: 10.1016/J.ENG.2017.03.005

Abstract: combinational surface kinetics enhancement and surface states passivation of nickel-borate (Ni-Bi) co-catalyst for a hematite (Fe2O3) photoanode.The Ni-Bi-modified Fe2O3 photoanode exhibits a cathodic onset potentialThe borate (Bi) in the Ni-Bi film promotes the release of protons for the oxygen

Keywords： Nickel-borate     Hematite     Oxygen evolution reaction     Co-catalyst    

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Pocket Modification of ω-Amine Transaminase <i>Ati>ATA for Overcoming the Trade-Off between Activity Article

Jiaren Cao, Fangfang Fan, Changjiang Lyu, Sheng Hu, Weirui Zhao, Jiaqi Mei, Shuai Qiu, Lehe Mei, Jun Huang

Engineering 2023, Volume 30, Issue 11,   Pages 203-214 doi: 10.1016/j.eng.2023.04.009

Abstract:

Amine transaminases (ATAs) catalyze the asymmetric amination of prochiral ketones or aldehydes to their corresponding chiral amines. However, the trade-off between activity and stability in enzyme engineering represents a major obstacle to the practical application of ATAs. Overcoming this trade-off is important for developing robustly engineered enzymes and a universal approach for ATAs. Herein, we modified the binding pocket of ω-ATA from Aspergillus terreus (AtATA) to identify the key amino acid residues controlling the activity and stability of AtATA toward 1-acetonaphthone. We discovered a structural switch comprising four key amino acid sites (R128, V149, L182, and L187), as well as the "best" mutant (AtATA_D224K/V149A/L182F/L187F; termed M4). Compared to the parent enzyme AtATA_D224K (AtATA-Pa), M4 increased the catalytic efficiency (kcat/Km1-acetonaphthone, where kcat is 10.1 min–1, Km is 1.7 mmol·L–1) and half-life (t1/2) by 59-fold to 5.9 L·min–1·mmol–1 and by 1.6-fold to 46.9 min, respectively. Moreover, using M4 as the biocatalyst, we converted a 20 mmol·L–1 aliquot of 1-acetonaphthone in a 50 mL scaledup system to the desired product, (R)-(+)-1(1-naphthyl)ethylamine ((R)-NEA), with 78% yield and high enantiomeric purity (R > 99.5%) within 10 h. M4 also displayed significantly enhanced activity toward various 1-acetonaphthone analogs. The related structural properties derived by analyzing structure and sequence information of robust ATAs illustrated their enhanced activity and thermostability. Strengthening of intramolecular interactions and expansion of the angle between the substratebinding pocket and the pyridoxal 5′-phosphate (PLP)-binding pocket contributed to synchronous enhancement of ATA thermostability and activity. Moreover, this pocket engineering strategy successfully transferred enhanced activity and thermostability to three other ATAs, which exhibited 8%–22% sequence similarity with AtATA. This research has important implications for overcoming the trade-off between ATA activity and thermostability.

Keywords： Trade-off     Co-evolution     Amine transaminase     (<i>Ri>)-(+)-1(1-naphthyl)ethylamine    

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Non-thermal plasma for exhaust gases treatment

Elvia ALVA R.,Marquidia PACHECO P.,Fernando GÓMEZ B.,Joel PACHECO P.,Arturo COLÍN C.,Víctor SÁNCHEZ-MENDIETA,Ricardo VALDIVIA B.,Alfredo SANTANA D.,José HUERTAS C.,Hilda FRÍAS P.

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 3,   Pages 301-305 doi: 10.1007/s11465-015-0344-z

Abstract:

This article describes a study on a non-thermal plasma device to treat exhaust gases in an internal combustion engine. Several tests using a plasma device to treat exhaust gases are conducted on a Honda GX200-196 cm3 engine at different rotational speeds. A plasma reactor could be efficient in degrading nitrogen oxides and particulate matter. Monoxide and carbon dioxide treatment is minimal. However, achieving 1%–3% degradation may be interesting to reduce the emission of greenhouse gases.

Keywords： plasma treatment     NO<i>xi>     CO     CO2     particulate matter     vehicle    

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CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

Frontiers in Energy 2023, Volume 17, Issue 3,   Pages 428-445 doi: 10.1007/s11708-023-0865-9

Abstract: conducted to investigate the performance of injecting different gases to enhance shale gas recovery and COto different gases was in agreement with the extended-Langmuir model, and the adsorption capacity of COFor the core flooding tests, pure gas injection showed that the breakthrough time of CO2 wasFor CO2/N2 mixed gas injection, with the increase of CO2 concentration2/N2 = 8:2 was close to that of pure CO2, about 40.24%.

Keywords： shale gas     gas injection     competitive adsorption     enhanced shale gas recovery     CO2 geological    

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Title Author Date Type Operation

Poly(vinylidene fluoride--hexafluoro propylene) membranes prepared via thermally induced phase separation and application in direct contact membrane distillation

Journal Article

Bamboo-like -doped carbon nanotubes encapsulating M(Co, Fe)-Ni alloy for electrochemical production ofsyngas with potential-independent CO/H ratios

Journal Article

Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA

Shuna LI, Huawei YANG, Donghui ZHANG

Journal Article

NiBO (B = Mn or Co) catalysts for NH-SCR of NO at low-temperature in microwave field

Journal Article

Co-conversion of methanol and

Shumei Wei, Yarong Xu, Zhaoyang Jin, Xuedong Zhu

Journal Article

polarization strategy to deploy proton resource over atomic-level metal sites for highly selective CO

Journal Article

Carbon-coated Ni-Co alloy catalysts: preparation and performance for aqueous phase hydrodeoxygenation

Journal Article

Process stability and microbial community composition in pig manure and food waste anaerobic co-digesters

Conor Dennehy, Peadar G. Lawlor, Gillian E. Gardiner, Yan Jiang, Paul Cormican, Matthew S. McCabe, Xinmin Zhan

Journal Article

Magnetic Co-doped 1D/2D structured -FeO/MoS effectively activated peroxymonosulfate for efficient abatement

Journal Article

On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable

Journal Article

Synthesis of vinylferrocene and the ligand-exchange reaction between its copolymer and carbon nanotubes

Ran SHI,Hai WANG,Ping TANG,Yuezhen BIN

Journal Article

Improved Oxygen Evolution Kinetics and Surface States Passivation of Ni-Bi Co-Catalyst for

Ke Dang,Tuo Wang,Chengcheng Li,Jijie Zhang,Shanshan Liu,Jinlong Gong

Journal Article

Pocket Modification of ω-Amine Transaminase <i>Ati>ATA for Overcoming the Trade-Off between Activity

Jiaren Cao, Fangfang Fan, Changjiang Lyu, Sheng Hu, Weirui Zhao, Jiaqi Mei, Shuai Qiu, Lehe Mei, Jun Huang

Journal Article

Non-thermal plasma for exhaust gases treatment

Elvia ALVA R.,Marquidia PACHECO P.,Fernando GÓMEZ B.,Joel PACHECO P.,Arturo COLÍN C.,Víctor SÁNCHEZ-MENDIETA,Ricardo VALDIVIA B.,Alfredo SANTANA D.,José HUERTAS C.,Hilda FRÍAS P.

Journal Article

CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

Journal Article