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An Eight-Step Continuous-Flow Total Synthesis of Vitamin B<sub>1sub> Article

Meifen Jiang, Minjie Liu, Weijian Li, Yingqi Xia, Fener Chen

Engineering 2024, Volume 32, Issue 1,   Pages 226-232 doi: 10.1016/j.eng.2023.01.016

Abstract:

Vitamin B<sub>1sub> is widely applied in the healthcare and food industry as an antineuritic andThis study reports on an integrated eight-step continuous-flow synthesis of vitamin B<sub>1sub> fromcommercially available 2-cyanoacetamide.Vitamin B<sub>1sub> was produced with a separated yield of 47.7% and high purity, with a total residence

Keywords： Vitamin B1     Continuous-flow synthesis     Micro-reactor     Continuous manufacturing    

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Biotechnological Strategies of Riboflavin Biosynthesis in Microbes Review

Jia-Rong Zhang, Ying-Ying Ge, Pin-He Liu, Ding-Tao Wu, Hong-Yan Liu, Hua-Bin Li, Harold Corke, Ren-You Gan

Engineering 2022, Volume 12, Issue 5,   Pages 115-127 doi: 10.1016/j.eng.2021.03.018

Abstract:

Riboflavin is an essential micronutrient for humans and must be obtained exogenously from foods or supplements. Numerous studies have suggested a major role of riboflavin in the prevention and treatment of various diseases. There are mainly three strategies for riboflavin synthesis, including total chemical synthesis, chemical semi-synthesis, and microbial fermentation, the latter being currently the most promising strategy. In recent years, flavinogenic microbes have attracted increasing attention. Fungi, including Eremothecium ashbyii and Ashbya gossypii, and bacteria, including Bacillus subtilis, Escherichia coli, and lactic acid bacteria, are ideal cell factories for riboflavin overproduction. Thus they are good candidates for enhancing the level of riboflavin in fermented foods or designing novel riboflavin bio-enriched foods with improved nutritional value and/or beneficial properties for human health. This review briefly describes the role of riboflavin in human health and the historical process of its industrial production, and then highlights riboflavin biosynthesis in bacteria and fungi, and finally summarizes the strategies for riboflavin overproduction based on both the optimization of fermentation conditions and the development of riboflavin-overproducing strains via chemical mutagenesis and metabolic engineering. Overall, this review provides an updated understanding of riboflavin biosynthesis and can promote the research and development of fermented food products rich in riboflavin.

Keywords： Vitamin B<sub>2     Bacillus subtilis     Lactic acid bacteria     Fungi     Microbial fermentation    

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Challenge of global climate change: Prospects for a new energy paradigm

Michael B. MCELROY

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 1,   Pages 2-11 doi: 10.1007/s11783-010-0005-8

Abstract: Perspectives on the challenge posed by potential future climate change are presented including a discussion of prospects for carbon capture followed either by sequestration or reuse including opportunities for alternatives to the use of oil in the transportation sector. The potential for wind energy as an alternative to fossil fuel energy as a source of electricity is outlined including the related opportunities for cost effective curtailment of future growth in emissions of CO.

Keywords： climate change     carbon capture     wind     ethanol     CO<sub>2sub>     radiative forcing    

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Improved Oxygen Evolution Kinetics and Surface States Passivation of Ni-B<sub>isub> 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: the combinational surface kinetics enhancement and surface states passivation of nickel-borate (Ni-B<sub>isub>) co-catalyst for a hematite (Fe<sub>2sub>O<sub>3sub>) photoanode.The Ni-B<sub>isub>-modified Fe<sub>2sub>O<sub>3sub> photoanode exhibits a cathodic onset potentialThe borate (B<sub>isub>) in the Ni-B<sub>isub> film promotes the release of protons for the oxygen

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

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supported polyhedral NiS/NiS nanocrystals with excellent photocatalytic performance for removing rhodamine B

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6,   Pages 1537-1549 doi: 10.1007/s11705-021-2094-2

Abstract: Hence, photoreduction of Cr(VI) to Cr(III) and degradation of rhodamine B (RhB) using a novel photocatalystIn this work, h-BN/NiS<sub>2sub>/NiS composites were prepared via a simple solvothermal methodThe 7 wt-% h-BN/NiS<sub>2sub>/NiS composites were characterized via a larger specific surfacethat of NiS<sub>2sub>/NiS (34%).>2sub>/NiS photocatalyst via the interfacial effects.

Keywords： graphene-like h-BN     h-BN/NiS<sub>2sub>/NiS composites     photocatalysis     Cr(VI) reduction    

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Prevalence of vitamin D deficiency in girls with idiopathic central precocious puberty

Yue Zhao, Wenjun Long, Caiqi Du, Huanhuan Yang, Shimin Wu, Qin Ning, Xiaoping Luo

Frontiers of Medicine 2018, Volume 12, Issue 2,   Pages 174-181 doi: 10.1007/s11684-017-0544-5

Abstract:

The relationship between vitamin D deficiency and idiopathic central precocious puberty (ICPP) hasCorrelation analysis showed that vitamin D level is correlated with BMI and some metabolic parametersOur study suggested that vitamin D status may be associated with ICPP risk and may have a threshold effect

Keywords： idiopathic central precocious puberty     threshold effects     vitamin D status    

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Non-thermal plasma for exhaust gases treatment

,Fernando GÓMEZ B.,Joel PACHECO P.,Arturo COLÍN C.,Víctor SÁNCHEZ-MENDIETA,Ricardo VALDIVIA B.

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<sub>xsub>     CO     CO<sub>2sub>     particulate matter     vehicle    

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New Trends in Olefin Production

Van Geem,Guy B. Marin

Engineering 2017, Volume 3, Issue 2,   Pages 171-178 doi: 10.1016/J.ENG.2017.02.006

Abstract:

Most olefins (e.g., ethylene and propylene) will continue to be produced through steam cracking (SC) of hydrocarbons in the coming decade. In an uncertain commodity market, the chemical industry is investing very little in alternative technologies and feedstocks because of their current lack of economic viability, despite decreasing crude oil reserves and the recognition of global warming. In this perspective, some of the most promising alternatives are compared with the conventional SC process, and the major bottlenecks of each of the competing processes are highlighted. These technologies emerge especially from the abundance of cheap propane, ethane, and methane from shale gas and stranded gas. From an economic point of view, methane is an interesting starting material, if chemicals can be produced from it. The huge availability of crude oil and the expected substantial decline in the demand for fuels imply that the future for proven technologies such as Fischer-Tropsch synthesis (FTS) or methanol to gasoline is not bright. The abundance of cheap ethane and the large availability of crude oil, on the other hand, have caused the SC industry to shift to these two extremes, making room for the on-purpose production of light olefins, such as by the catalytic dehydrogenation of propane.

Keywords： Olefin production     Steam cracking     Methane conversion     Shale gas     CO<sub>2sub> emissions    

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Design, synthesis, and antiviral properties of 2-aryl-1H-benzimidazole-4-carboxamide derivatives

Xianjin LUO, Zhonglü ZHANG, Yutian YANG, Fei XUE, Naiyun XIU, Yuanbin SHE

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 3,   Pages 305-309 doi: 10.1007/s11705-009-0021-z

Abstract: better selective activity and inhibitory activity than the comparable ribavirin against Coxsackie virus B

Keywords： benzimidazole     coxsackie virus B<sub>3sub>     antiviral properties    

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A chemical etching route to controllable fabrication of TiO

Weixin ZHANG, Jie XING, Zeheng YANG, Mei KONG, Hongxu YAO

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2,   Pages 192-201 doi: 10.1007/s11705-013-1319-4

Abstract: The photocatalytic performances of these samples were evaluated for the photodegradation of rhodamine B

Keywords： TiO<sub>2sub>     hollow nanospheres     rhodamine B     photocatalytic activity    

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Removal of rhodamine B from aqueous solution by BiPO

Lei LI, Jian XU, Changsheng GUO, Yuan ZHANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 3,   Pages 382-387 doi: 10.1007/s11783-013-0504-5

Abstract: Hexahedron-like BiPO microcrystals were sucessfully synthesized via a template-free hydrothermal method. The resulting samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV–vis spectroscopy. The BiPO samples were of pure monoclinic phase, and the initial amount of during synthesis did not show obvious effect on the phase properties of the materials. The hexahedron-like BiPO microcrystal had explicitly cut edges, and its thickness was about 1 μm. The photocatalytic performance of the BiPO catalysts was evaluated by photodegradation of RhB under UV light irradiation with commerial Degussa P25 TiO as reference. Compared with P25, the BiPO catalysts displayed higher photocatalytic activity, with 98.7% of RhB degraded during 60-min experiment. Cost evaluation analysis was adopted to describe the energy consumption of the degradation process, and the results suggested the potential application of this material in the field of dye-contaminated wastewater treatment or environmental matrices remediation.

Keywords： BiPO<sub>4sub>     photocatalysis     Rhodamine B     cost evaluation    

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Metal-Free Hexagonal Perovskite High-Energetic Materials with NH<sub>3sub>OH+/NH<sub>2sub>NH<sub>3sub>+ as B-site Cations Article

Yu Shang, Zhi-Hong Yu, Rui-Kang Huang, Shao-Li Chen, De-Xuan Liu, Xiao-Xian Chen, Wei-Xiong Zhang, Xiao-Ming Chen

Engineering 2020, Volume 6, Issue 9,   Pages 1013-1018 doi: 10.1016/j.eng.2020.05.018

Abstract: >2sub>dabco)B(ClO<sub>4sub>)<sub>3sub> (H<sub>2sub>dabco2+ = 1,4-diazabicyclo[2.2.2>+ and NH<sub>2sub>NH<sub>3sub>+ as B-site cations, respectively.Compared with their NH<sub>4sub>+ analog ((H<sub>2sub>dabco)(NH<sub>4sub>)(ClO<sub>4sub>)<sub>3sub>; DAP-4), which has a cubic perovskite structure, DAP-6 and DAP-7 have higher crystal6.23 kJ·g‒1; I<sub>spsub> = 264.8 s).

Keywords： Energetic materials     Single explosive     Solid propellant     Metal-free     Hexagonal perovskite    

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Rh<sub>2sub>O<sub>3sub>/hexagonal CePO<sub>4sub> nanocatalysts for N<sub>2sub>O decomposition

Huan Liu, Zhen Ma

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 586-593 doi: 10.1007/s11705-017-1659-6

Abstract: Hexagonal CePO nanorods were prepared by a precipitation method and hexagonal CePO nanowires were prepared by hydrothermal synthesis at 150 °C. Rh(NO ) was then used as a precursor for the impregnation of Rh O onto these CePO materials. The Rh O supported on the CePO nanowires was much more active for the catalytic decomposition of N O than the Rh O supported on CePO nanorods. The stability of both catalysts as a function of time on stream was studied and the influence of the co-feed (CO , O , H O or O /H O) on the N O decomposition was also investigated. The samples were characterized by N adsorption-desorption, inductively coupled plasma optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, hydrogen temperature-programmed reduction, oxygen temperature-programmed desorption, and CO temperature-programmed desorption in order to correlate the physicochemical and catalytic properties.

Keywords： Rh<sub>2sub>O<sub>3sub>     CePO<sub>4sub>     N<sub>2sub>O decomposition    

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CO<sub>2sub> methanation and co-methanation of CO and CO<sub>2sub> over Mn-promoted Ni/Al<sub>2sub>O<sub>3sub> catalysts

Kechao Zhao,Zhenhua Li,Li Bian

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 2,   Pages 273-280 doi: 10.1007/s11705-016-1563-5

Abstract: A series of Mn-promoted 15 wt-% Ni/Al O catalysts were prepared by an incipient wetness impregnation method. The effect of the Mn content on the activity of the Ni/Al O catalysts for CO methanation and the co-methanation of CO and CO in a fixed-bed reactor was investigated. The catalysts were characterized by N physisorption, hydrogen temperature-programmed reduction and desorption, carbon dioxide temperature-programmed desorption, X-ray diffraction and high-resolution transmission electron microscopy. The presence of Mn increased the number of CO adsorption sites and inhibited Ni particle agglomeration due to improved Ni dispersion and weakened interactions between the nickel species and the support. The Mn-promoted 15 wt-% Ni/Al O catalysts had improved CO methanation activity especially at low temperatures (250 to 400 °C). The Mn content was varied from 0.86% to 2.54% and the best CO conversion was achieved with the 1.71Mn-Ni/Al O catalyst. The co-methanation tests on the 1.71Mn-Ni/Al O catalyst indicated that adding Mn markedly enhanced the CO methanation activity especially at low temperatures but it had little influence on the CO methanation performance. CO methanation was more sensitive to the reaction temperature and the space velocity than the CO methanation in the co-methanation process.

Keywords： Mn promotion     nickel catalysts     CO<sub>2sub> methanation     co-methanation of CO and CO<sub>2sub>    

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A Storage-Driven CO<sub>2sub> EOR for a Net-Zero Emission Target Article

Yueliang Liu, Zhenhua Rui

Engineering 2022, Volume 18, Issue 11,   Pages 79-87 doi: 10.1016/j.eng.2022.02.010

Abstract: >2sub>) emissions.>2sub> emissions by storing CO<sub>2sub> in oil reservoirs.CO<sub>2sub> EOR—whose main target is to realize net-zero or even negative CO<sub>2sub> emissionsStorage-driven CO<sub>2sub> EOR is superior to conventional CO<sub>2sub> EOR in improving sweepingthan conventional CO<sub>2sub> EOR.

Keywords： CO<sub>2sub>     EOR     Net CO<sub>2sub>     emissions     Dimethyl ether     Storage-driven CO<sub>2sub>     EOR     CO<sub>2sub>     sequestration    

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Title Author Date Type Operation

An Eight-Step Continuous-Flow Total Synthesis of Vitamin B<sub>1sub>

Meifen Jiang, Minjie Liu, Weijian Li, Yingqi Xia, Fener Chen

Journal Article

Biotechnological Strategies of Riboflavin Biosynthesis in Microbes

Jia-Rong Zhang, Ying-Ying Ge, Pin-He Liu, Ding-Tao Wu, Hong-Yan Liu, Hua-Bin Li, Harold Corke, Ren-You Gan

Journal Article

Challenge of global climate change: Prospects for a new energy paradigm

Michael B. MCELROY

Journal Article

Improved Oxygen Evolution Kinetics and Surface States Passivation of Ni-B<sub>isub> Co-Catalyst for

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

Journal Article

supported polyhedral NiS/NiS nanocrystals with excellent photocatalytic performance for removing rhodamine B

Journal Article

Prevalence of vitamin D deficiency in girls with idiopathic central precocious puberty

Yue Zhao, Wenjun Long, Caiqi Du, Huanhuan Yang, Shimin Wu, Qin Ning, Xiaoping Luo

Journal Article

Non-thermal plasma for exhaust gases treatment

,Fernando GÓMEZ B.,Joel PACHECO P.,Arturo COLÍN C.,Víctor SÁNCHEZ-MENDIETA,Ricardo VALDIVIA B.

Journal Article

New Trends in Olefin Production

Van Geem,Guy B. Marin

Journal Article

Design, synthesis, and antiviral properties of 2-aryl-1H-benzimidazole-4-carboxamide derivatives

Xianjin LUO, Zhonglü ZHANG, Yutian YANG, Fei XUE, Naiyun XIU, Yuanbin SHE

Journal Article

A chemical etching route to controllable fabrication of TiO

Weixin ZHANG, Jie XING, Zeheng YANG, Mei KONG, Hongxu YAO

Journal Article

Removal of rhodamine B from aqueous solution by BiPO

Lei LI, Jian XU, Changsheng GUO, Yuan ZHANG

Journal Article

Metal-Free Hexagonal Perovskite High-Energetic Materials with NH<sub>3sub>OH+/NH<sub>2sub>NH<sub>3sub>+ as B-site Cations

Yu Shang, Zhi-Hong Yu, Rui-Kang Huang, Shao-Li Chen, De-Xuan Liu, Xiao-Xian Chen, Wei-Xiong Zhang, Xiao-Ming Chen

Journal Article

Rh<sub>2sub>O<sub>3sub>/hexagonal CePO<sub>4sub> nanocatalysts for N<sub>2sub>O decomposition

Huan Liu, Zhen Ma

Journal Article

CO<sub>2sub> methanation and co-methanation of CO and CO<sub>2sub> over Mn-promoted Ni/Al<sub>2sub>O<sub>3sub> catalysts

Kechao Zhao,Zhenhua Li,Li Bian

Journal Article

A Storage-Driven CO<sub>2sub> EOR for a Net-Zero Emission Target

Yueliang Liu, Zhenhua Rui

Journal Article