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Tuning catalytic properties using an atomically dispersed metal overlayer on transition metal carbide substrates

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National Science Review 2017年第6期4卷 788-789页

作者： jingguang G.chen Chemistry Department Brookhaven National Laboratory Department of Chemical Engineering Columbia University

Aqueous-phase reforming of methanol(APRM)represents an important reaction to produce hydrogen for lowtemperature polymer electrode membrane(PEM)hydrogen fuel *** ideal catalyst for APRM should show high activity towar... 详细信息

关键词： PGM TMC Tuning catalytic properties using an atomically dispersed metal overlayer on transition metal carbide substrates Pt

Challenges and opportunities in plasma-activated reactions of CO_(2) with light alkanes

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Journal of Energy Chemistry 2023年第9期84卷 424-427页

作者： Lea R.Winter jingguang G.chen Department of Chemical and Environmental Engineering Yale UniversityNew HavenCT 06520United States Department of Chemical Engineering Columbia UniversityNew YorkNY 10027United States Chemistry Division Brookhaven National LaboratoryUptonNY 11973United States

Mitigation of the deleterious environmental impacts associated with CO_(2) emissions requires the development of more sustainable processes for synthesizing fuels and *** conversion of abundant yet difficult to activate molecules such as CO_(2) and surplus light alkanes from shale gas to desirable products can potentially reduce reliance upon conventional fossil-based ***,co-conversion of CO_(2) with abundant light alkanes such as methane and ethane using atmospheric-pressure.

关键词： alkanes methane synthesizing

Progress on Molecular Mechanism of Aluminum Resistance in Rice

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Rice science 2020年第6期27卷 454-467页

作者： chen jingguang Lai Qi Zeng Baiquan Guo Longbiao Ye Guoyou CAAS-IRRI Joint Laboratory for Genomics-Assisted Germplasm Enhancement Agricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518108China College of Life Science and Technology Central South University of Forestry&TechnologyChangsha 410004China State Key Laboratory of Rice Biology/Chinese National Center for Rice Improvement China National Rice Research InstituteHangzhou 310006China Strategic Innovation Platform International Rice Research InstituteDAPO Box 7777Metro Manilathe Philippines

Aluminum(Al)toxicity in acid soils is a significant limitation to crop production worldwide,as 13%of the world's rice is produced in acid soil with high Al *** is likely the most Al-resistant cereal and also the cereal,where Al resistance is the most genetically complex with external detoxification and internal *** Al-resistance genes in rice have been cloned,including Al resistance transcription factor 1(ART1)and other transcription factors,organic acid transporter genes,and metal ion transporter *** review summarized the recent characterized genes affecting Al tolerance in rice and the interrelationships between Al and other plant nutrients.

关键词： rice aluminum Al transporter Al tolerance Al toxicity

Reduction-induced metal/oxide interfacial sites for selective CO_(2) hydrogenation

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SmartMat 2023年第4期4卷 199-209页

作者： Zhenhua Xie Sooyeon Hwang jingguang G.chen Department of Chemical Engineering Columbia UniversityNew YorkNew YorkUSA Chemistry Division Brookhaven National LaboratoryUptonNew YorkUSA Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNew YorkUSA

The interfacial structures of bimetallic-derived catalysts play an important role in promoting the activation of reactants such as CO_(2).In particular,both the physical property(e.g.,local bonding environment)and the electronic property(e.g.,oxidation state)can evolve from their native states under different environments,such as upon reduction and during the catalytic ***,taking the CO_(2) hydrogenation reaction over Rh-based catalysts as a case study,the present work compares the interfacial structures in tuning the selectivity toward CH_(4) or *** combination of ex situ and in situ characterization reveals two representative interfacial structures:the Rh/CeO_(x) interface formed over Rh/CeO_(2) is active and selective to produce CH_(4)(~95%)by following a formate-mediated pathway;in comparison,the InO_(x)/Rh interface derived after reduction is active for CO_(2) activation and enables a redox mechanism for the exclusive formation of CO(~100%).This work provides insights into the environment-induced structural evolution at the metal−oxide interfaces,as well as the role of distinct interfacial active sites in tuning the selectivity of CO_(2) hydrogenation.

关键词： CO_(2) hydrogenation interfacial structure Rh-based catalysts structural evolution

Rice Heavy Metal P-type ATPase OsHMA6 Is Likely a Copper Efflux Protein

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Rice science 2020年第2期27卷 143-151页

作者： ZOU Wenli LI Chang ZHU Yajun chen jingguang HE Haohua YE Guoyou Group of Crop Genetics and Breeding School of Agriculture ScienceJiangxi Agricultural UniversityNanchang 330045China CAAS-IRRI Joint Laboratory for Genomics-Assisted Germplasm Enhancement Agricultural Genomics Institute in ShenzhenChinese Academy of Agricultural SciencesShenzhen 518057China College of Resources and Environment Henan Agricultural UniversityZhengzhou 450002China

P1B-type heavy metal ATPases(HMAs)are transmembrane metal-transporting proteins that play a key role in metal *** here reported the characterization of rice OsHMA6,a member of the P1B-type ATPase *** tree analysis showed that OsHMA6 belonged to the Cu/Ag subgroup of the HMA family and had a close evolutionary relationship with *** acid sequence alignment showed 82.78%consistency between OsHMA6 and ***6 expressed in all organs at different growth stages,including spikelet,and abundant in leaf blades,however,OsHMA9 most strongly expressed in roots,but very low in *** Cu^2+can up-regulate the expression of OsHMA6 and OsHMA9 in rice *** heterologous expression in yeast showed that OsHMA6 can significantly rescue the growth of yeast strain CM52 when supplied with 3 or 6 mmol/L Cu^2+.Compared with the empty vector pYES2,the Cu concentration in OsHMA6-pYES2 decreased by 23.4%and 30.3%under 3 or 6 mmol/L Cu2+,*** localization revealed that OsHMA6 was located in the plasma *** results suggested that OsHMA6,similar to OsHMA9,is likely a copper efflux protein located in the plasma membrane.

关键词： OsHMA6 P1B-type ATPase copper cadmium efflux rice subcellular localization

Coupling CO_(2)reduction with ethane aromatization for enhancing catalytic stability of iron-modified ZSM-5

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Journal of Energy Chemistry 2022年第3期31卷 210-217,I0007页

作者： Zhenhua Xie Elaine Gomez Dong Wang Ji Hoon Lee Tiefeng Wang jingguang G.chen Department of Chemical Engineering Columbia UniversityNew YorkNY 10027USA Chemistry Division Brookhaven National LaboratoryUptonNY 11973USA Department of Chemical Engineering Tsinghua UniversityBeijing100084 BeijingChina

The shale gas revolution and the carbon-neutrality goal are motivating the landscape toward the synthesis of value-added chemicals or fuels from underutilized ethane with the assistance of greenhouse gas CO_(2).Combining ethane aromatization with CO_(2)reduction offers an opportunity to directly produce liquid products for facile separation,storage,and *** the present work,Fe/ZSM-5 catalysts showed promise in the simultaneous CO_(2)reduction and ethane aromatization at atmospheric pressure and 873 *** catalysts were further investigated using X-ray diffraction(XRD)and X-ray absorption fine structure(XAFS)measurements under in-situ conditions,indicating that most of Fe species existed in the form of Fe oxides and a portion of Fe was incorporated into the ZSM-5 framework generating Lewis acid *** types of Fe species remained almost unchanged under reaction conditions,contributing to an enhanced aromatization activity of Fe/*** effects of CO_(2)and steam on the acid sites and in turn aromatization activity were also investigated by transient studies,which exhibited a reversible modification ***,CO_(2)was identified to be critical to enhance coke resistance and in turn catalyst *** work highlights the feasibility of using CO_(2)to assist the upgrading of abundant ethane from shale gas to aromatics over non-precious Fe-based zeolite catalysts.

关键词： Ethane CO_(2) Aromatization Fe-modified ZSM-5

Utilizing bimetallic catalysts to mitigate coke formation in dry reforming of methane

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Journal of Energy Chemistry 2022年第5期31卷 124-142页

作者： Jaylin Sasson Bitters Tina He Elizabeth Nestler Sanjaya D.Senanayake jingguang G.chen cheng Zhang College of Liberal Arts and Sciences Long Island University(Post)BrookvilleNY 11548United States Department of Molecular Biosciences University of Texas at AustinAustinTX 78712United States Chemistry Division Brookhaven National LaboratoryUptonNY 11973United States Department of Chemical Engineering Columbia UniversityNew YorkNY 10027United States

Dry reforming of methane(DRM) involves the conversion of carbon dioxide(CO_(2)) and methane(CH_(4)) into syngas(a mixture of hydrogen, H_(2), and carbon monoxide, CO), which can then be used to produce a wide range of products by means of Fischer–Tropsch synthesis. DRM has gained much attention as a means of mitigating damage from anthropogenic greenhouse gas(GHGs) emissions to the environment and instead utilizing these gases as precursors for value-added chemicals or to synthesize sustainable fuels and chemicals. Carbon deposition or coke formation, a primary cause of catalyst deactivation, has proven to be a major challenge in the development of DRM catalysts. The use of nickel-and cobalt-based catalysts has been extensively explored for DRM for their high activity and low cost but suffer from poor stability due to coke formation that has hindered their commercialization. Numerous articles have reviewed the various aspects of catalyst deactivation and strategies for mitigation, but few has focused on the benefit of bimetallic catalysts for mitigating coke formation. Bimetallic catalysts, often improve the catalytic stability over their monometallic counterparts due to synergistic effects resulting from two metal-tometal interactions. This review will cover DRM literature for various bimetallic catalyst systems, including the effect of supports and promoters, on the mitigation of carbonaceous deactivation.

关键词： Dry reforming of methane Carbon dioxide Bimetallic catalysts Coke formation Catalyst stability

Identification of Green-Revertible Yellow 3(GRY3),encoding a 4-hydroxy-3-methylbut-2-enyl diphosphate reductase involved in chlorophyll synthesis under high temperature and high light in rice

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The Crop Journal 2023年第4期11卷 1171-1180页

作者： Hongzhen Jiang Anpeng Zhang Banpu Ruan Haitao Hu Rui Guo jingguang chen Qian Qian Zhenyu Gao China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006ZhejiangChina School of Agriculture Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107GuangdongChina Institute of Crop Breeding and Cultivation Shanghai Academy of Agricultural SciencesShanghai 201403China College of Life and Environmental Sciences Hangzhou Normal UniversityHangzhou 311121ZhejiangChina

Chlorophyll,a green pigment in photosynthetic organisms,is generated by two distinct biochemical pathways,the tetrapyrrole biosynthetic pathway(TBP) and the methylerythritol 4-phosphate(MEP)*** is one of the pathways for isoprenoid synthesis in plants,with 4-hydroxy-3-methylbut-2-enyl diphosphate reductase(HDR) catalyzing its last *** this study,we isolated a greenrevertible yellow leaf mutant gry3 in rice and cloned the GRY3 gene,which encodes a HDR participating in geranylgeranyl diphosphate(GGPP) biosynthesis in chloroplast.A complementation experiment confirmed that a missense mutation(C to T) in the fourth exon of LOC_Os03g52170 causes the gry3 *** high temperature and high light,transcript and protein abundances of GRY3 were reduced in the gry3 *** expression of chlorophyll biosynthesis,chloroplast development,and genes involved in photosynthesis were also *** reactive oxygen species accumulation,cell death,and photosynthetic proteins degradation were occurred in the *** content of GGPP was reduced in gry3 compared with Nipponbare,resulting in a stoichiometric imbalance of tetrapyrrolic chlorophyll *** results shed light on the response of chloroplast biogenesis and maintenance in plants to high-temperature and high-light stress.

关键词： Chloroplast High temperature High light Rice

Synthesis and electrocatalytic applications of flower-like motifs and associated composites of nitrogen-enriched tungsten nitride(W2N3)

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Nano Research 2020年第5期13卷 1434-1443页

作者： Sha Tan Brian M.Tackett Qun He Ji Hoon Lee jingguang G.chen Stanislaus S.Wong Department of Chemistry State University of New York at Stony BrookStony BrookNY 11794-3400USA Department of Chemical Engineering Columbia UniversityNew YorkNY 10027USA Chemistry Department Building 555Brookhaven National LaboratoryUptonNY 11973USA

We have sought to improve the electrocatalytic performance of tungsten nitride through synthetic control over chemical composition and *** particular,we have generated a thermodynamically unstable but catalytically promising nitrogen-rich phase of tungsten via a hydrothermal generation of a tungsten oxide intermediate and subsequent annealing in *** net product consisted of three-dimensional(3D)micron-scale flower-like motifs of W2N3;this architecture not only evinced high structural stability but also incorporated the favorable properties of constituent two-dimensional *** a performance perspective,as-prepared 3D W2N3 demonstrated promising hydrogen evolution reaction(HER)activities,especially in an acidic environment with a measured overpotential value of−101 mV at a current density of 10 mA/cm^*** further enhance the electrocatalytic activity,small amounts of precious metal nanoparticles(such as Pt and Au),consisting of variable sizes,were uniformly deposited onto the underlying 3D W2N3 motifs using a facile direct deposition method;these composites were applied towards the CO2 reduction reaction(CO2RR).A highlight of this series of experiments was that Au/W2N3 composites were found to be a much more active HER(as opposed to either a CO2RR or a methanol oxidation reaction(MOR))catalyst.

关键词： tungsten nitride synthesis composite morphology control electrocatalysis