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Efficient hydrocarboxylation of alkynes based on carbodiimide‐regulated in situ CO generation from HCOOH:An alternative indirect utilization of CO_(2)

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Chinese Journal of Catalysis 2022年第7期43卷 1642-1651页

作者： Shu-Mei Xia Zhi-Wen Yang Kai-Hong Chen Ning Wang Liang-Nian He State Key Laboratory of Elemento-Organic Chemistry College of Chemistry Nankai UniversityTianjin 300071China

The role of carbodiimide as dehydrant in the chemo‐,regio‐and stereoselective Pd(Ⅱ/0)‐catalyzed hydrocarboxylation of various alkynes with HCOOH releasing CO in situ is reported for the first time to obtainα,β‐unsaturated carboxylic *** symmetrical and unsymmetrical monoalkynes show good ***,2,2’‐(1,4‐phenylene)diacrylic acid can also be synthesized in high yield through the dihydrocarboxylation of 1,4‐***,an excellent result in gram scale experiment and TON up to 900 can be obtained,displaying the efficiency of this ***,regulating the types and concentrations of dehydrant can control the CO generation,avoiding directly operating toxic CO and circumventing sensitivity issue to the CO *** the basis of the attractive features of formic acid including easy preparation through CO_(2) hydrogenation and efficient liberation of CO,this protocol using formic acid as bridging reagent between CO_(2) and CO can be perceived as an indirect utilization of CO_(2),offering an alternative method for preparing acrylic acid analogues.

关键词： Carbodiimide Hydrocarboxylation formic acid CO_(2)indirect utilization α,β‐Unsaturated carboxylic acids Synthetic method

Adsorption of Formin acid Modified Clinoptilolite on *** O55

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Adsorption of Formin Acid Modified Clinoptilolite on *** O55

Deep desulfurization of diesel fuels by catalytic oxidation

中国畜牧兽医学会动物营养学分会第十一次全国动物营养学术研讨会

作者： Q.Wu Y.Zhou Y.Wu L.Zhang T.Wang~* (College of Animal Science and Technology,Nanjing Agricultural University,Nanjing 210095,China)

Natural clinoptilolite is a natural,the shelf containing aluminum silicate non-metallic minerals that has monoclinic crystal structure symmetry,strong adsorptive,high ion exchange capacity and high speci ? c surface area,have been widely used as a ***,the hydrophilic surfaces of parent clinoptilolites are less effective in adsorbing bacteria and *** modification of clinoptilolites with organic cations,results in an increased hydrophobicity of the mineral surface providing a high affinity for bacteria *** acid,an organic acidifier,has a dicky causticity and the antibacterial mechanism,which has been overused as a feed additive(acidifer) in the farming *** purpose of this study is to prepare formic acid-modified clinoptilolite by cation exchange and to evaluate its absorption properties on Escherichia coli O under ambient conditions,in *** of clay concentration,ionic concentration,lysine concentration,and time as well as bacterial suspensions concentration on *** O adsorption was also *** results show that(1) The amount of adsorption of *** O from solution to clay minerals were significantly increased with parent clinoptilolite and acid-modified clinoptilolite content increasing.(2) The adsorption processes occurring on each of the tested adsorbents reached equilibrium at 25 mg/ml clay *** discrepancy may result from the different amounts of parent clinoptilolite and acid-modified clinoptilolite added,which were between 30 to 50 mg/ml clay mineral in this study.(3 ) Ionic strength has an importmant influence on bacteria-clay mineral interaction. The amounts of *** O adsorbed on the tested adsorbents were increased with increased concentration of NaCl and CaCl in *** data determined from the adsorption ratio showed that Ca has higher influence than that Na.(4) The adsorption processes of *** O occurring on each of the tested adsorbents reached equilibrium after 2 *** the

关键词： E.coli O55 Clinoptilolite modified formic acid adsorption

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Frontiers of Chemical Science and Engineering 2007年第2期1卷 162-166页

作者： YU Guoxian CHEN Hui LU Shanxiang ZHU Zhongnan School of Chemical Engineering East China University of Science&TechnologyShanghai 200237China

Reaction feed was prepared by dissolving diben-zothiophene(DBT),which was selected as a model organo-sulfur compound in diesel fuels,in *** oxidant was a 30 wt-%aqueous solution of hydrogen *** performance of the activated carbons with saturation adsorp-tion of DBT was investigated in the presence of formic *** addition,the effects of activated carbon dosage,formic acid concentration,initial concentration of hydrogen perox-ide,initial concentration of DBT and reaction temperature on the oxidation of DBT were *** results indicated that performic acid and the hydroxyl radicals pro-duced are coupled to oxidize DBT with a conversion ratio of 100%.Catalytic performance of the combination of activated carbon and formic acid is higher than that of only formic *** concentration of formic acid,activated carbon dosage,initial concentration of hydrogen peroxide and reaction temperature affect the oxidative removal of *** higher the initial concentration of DBT in the n-octane solution,the more difficult the deep desulfurization by oxidation is.

关键词： activated carbon formic acid H2O2 dibenzothiophene oxdative desulfurization

Study of formic and Acetic acids in the Air of Humid Savannah Case of Lamto (Côte d’Ivoire)

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Atmospheric and Climate Sciences 2016年第2期6卷 254-266页

作者： Pêlèmayo Raoul Touré Georges Kouame Kouadio Urbain Kouakou Koffi Charles Romaric Beugré Laboratory of Atmospheric Physics and Fluid Mechanics (LAPA-MF) Félix Houphou&#235t-Boigny University Abidjan C&#244te d’Ivoire Physcal Science Laboratory of the Ecole Normale Supérieure of Abidjan (ENS) Abidjan C&#244te d’ivoire Laboratory of physical chemistry Félix Houphou&#235t-Boigny University Abidjan C&#244te d’Ivoire

From January 1995 to December 2004, 860 rainwater samples were collected in the humid savannah of Lamto. Using the Henry’s law, we determined the content of formic and acetic acids in the air based on their concentrations in rainwater. The annual partial pressure of both formic and acetic acids over the decade is variable. It covers a range of 0.003 (1998) to 0.21 ppbv (1996) and 0.27 (1999) to 0.47 ppbv (1996) for formic and acetic acids respectively. Also, the partial pressure in the dry season is higher than that in the wet season. This difference is related to the enrichment of the organic acid content in the air by the various sources that produce these acids. One of the main sources of increment in organic acid is biomass burning. This biomass burning contributes between 21% and 51% to the formation of the two acids in the humid savannah of Lamto. Ultimately the average annual organic acidity varies from 40% to 60% over the ten years period.

关键词： formic acid Acetic acid Organic acidity Biomass Burning

Comparable Characterization of Nanocellulose Extracted from BleachedSoftwood and Hardwood Pulps

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Paper And Biomaterials 2018年第4期3卷 35-44页

作者： Bin Li WenYang Xu Dennis Kronlund Jan-Erik Eriksson Anni Maattanen Stefan Willfor ChunLin Xu CAS Key Laboratory of Bio-based Materials CAS Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao Shandong Province 266101 China Johan Gadolin Process Centre c/o Laboratory of Wood and Paper ChemistryAbo Akademi University Turku FI-20500 Finland Laboratory of Physical Chemistry abo Akademi University Turku FI-20500 Finland Johan Gadolin Process Centre c/o Laboratory of Inorganic Chemistry Abo Akademi University Turku FI-20500 Finland

In this study, the characteristics of nanocellulose extracted from bleached softwood and hardwood pulps by formic acid hydrolysis followed by TEMPO-mediated oxidation were compared using transmission electron microscopy(TEM), atomic force microscopy(AFM), Fourier transform infrared analysis(FT-IR), X-ray diffraction(XRD), and thermal gravimetric analysis(TGA). The experimental results showed that the nanocellulose products derived from spruce pulp exhibited a relatively larger particle size, higher crystallinity, and higher thermal stability, compared with the corresponding products obtained from aspen pulp under the same ***, the study helped establish that the properties of the nanocellulose products were highly dependent on the nature of the starting materials under identical processing conditions.

关键词： nanocellulose cellulose nanocrystal cellulose nanofbril formic acid TEMPO-mediated oxidation comparison

Tiny pollutant emissions of a dimethyl ether fuelled engine

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Journal of Chongqing University 2008年第4期7卷 284-290页

作者：郎静张煜盛 Faculty of Energy and Power Engineering Huazhong University of Science and Technology

Emissions of dimethyl ether(DME) fuelled engines were investigated by orthogonal experiments on a ZS195 diesel *** study mainly focused on the tiny pollutant emissions of formaldehyde(CH2O),methyl formate(CH3OCHO) and formic acid(HCOOH).The presence of CH2O,CH3OCHO and HCOOH are proved in the exhaust by gas chromatograph and Fourier transform infrared *** analysis of variance results indicate that the fuel delivery advance angle is the most important factor for CH2O *** fuel delivery advance angle and the interaction of injection pressure and nozzle diameter are considerable factors for unburned hydrocarbon(UHC) *** mechanism forming tiny pollutants,primarily through CH2O formation,is suggested to be similar to the mechanism forming UHC by DME partial oxidation existing in crevices and boundary zones,and is verified via DME combustion simulation of a multizone chemical kinetic model.

关键词： dimethyl ether emission formaldehyde methyl formate formic acid

Unveiling the relationship between structural evaluation and catalytic performance of InOOH during electroreduction of CO_(2)to formate

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Green Carbon 2024年第1期2卷 124-130页

作者： Caijun Deng Chaofan Qi Xiaomin Wu Guohua Jing Huawang Zhao Department of Environmental Science&Engineering College of Chemical EngineeringHuaqiao UniversityXiamenFujian 361021 China

The electrochemical CO_(2)reduction reaction(ECO_(2)RR)to formate is perceived as a technoeconomic pathway for transforming renewable electricity into ***,the indeterminate mechanism underlying structural self-reconstruction obstructs the strategic design of a high-performance In catalyst for the ECO_(2)*** this study,we chose InOOH as the model catalyst to illustrate the dynamic structure of In-based catalysts during reconstruction in the ECO_(2)*** findings of the current study indicate that the in situ electrochemical reconstruction of crystalline InOOH results in the creation of crystalline In clusters/InOOH,followed by In/InOOH heterostructures,and finally,metallic In over *** efficiencies of the different phases conformed to the sequence:In clusters/InOOH>In/InOOH heterostructures>metallic *** progression leads to a continuous drop in maximum current density and Faradaic efficiency from 29.6 mA/cm2 and 87%to 6.3 mA/cm^(2) and 75%,respectively with time extending to 7200 s,at-1.0 V relative to the reversible hydrogen *** in situ characterization and theoretical studies highlighted the crucial role of the In-cluster/InOOH interface in CO_(2)activation and conversion.

关键词： Indium Carbon dioxide reduction electrochemistry formic acid Heterogeneous catalysis

Effects of Different Additives on Silage Qualities of Corn Stalks

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Animal Husbandry and Feed Science 2009年第8期1卷 17-19页

作者： WANG Jing YANG Zhong-ping Northwest A&F University Yangling 712100 China

[ Objective] To explore the effects of different additives on the fermentation qualities and chemical composition of corn stalk silage. [ Method] The corn stalks were fermented in preservative of silage supplemented formic acid and formic aldehyde for 50 d, and the fermentation qualities and chemical composition of silage were examined. [ Result] Supplementation of formic acid improved fermentation qualities and increased the content of crude protein and soluble carbohydrate, while the content of crude protein was lower in the control silage. Supplementation of formic aldehyde alone did not enhance the fermentation qualities of silage. Supplementation of both formic acid and formic aldehyde （ especially at a ratio of 3：1 ） markedly improved the fermentation qualities of silage than that of formic acid alone. [ Conclusion] Supplementation of formic both acid and formic aldehyde can improve the fermentation qualities of corn stalk silage.

关键词： formic acid formic aldehyde Corn Silage qualities

Synthesis and Characterization of Hybrid MWCNTs Materials for Direct formic Fuel Cells

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Synthesis and Characterization of Hybrid MWCNTs Materials fo...