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Hydrothermally stable metal oxide-zeolite composite catalysts for low-temperature NO_(x) reduction with improved N_(2) selectivity

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Chinese Chemical Letters 2024年第6期35卷 515-523页

作者： Lijun Yan Shiqi Chen Penglu Wang Xiangyu liu Lupeng Han Tingting Yan Yuejin Li dengsong Zhang School of Environmental and Chemical Engineering International Joint Laboratory of Catalytic ChemistryCollege of SciencesShanghai UniversityShanghai 200444China BASF Environmental Catalyst and Metal Solutions IselinNJ 08830United States

development of hydrothermally stable,low-temperature catalysts for controlling nitrogen oxides emissions from mobile sources remains an urgent *** have prepared a metal oxide-zeolite composite catalyst by depositing Mn active species on a mixture support of CeO_(2)/Al_(2)O_(3) and *** composite catalyst is hydrothermally stable and shows improved low-temperature SCR activity and significantly reduced N_(2)O formation than the corresponding metal oxide *** with a Cu-CHA catalyst,the composite catalyst has a faster response to NH_(3) injection and less NH_(3) *** characterization results reveal that such an oxide-zeolite composite catalyst contains more acidic sites and Mn^(3+)species as a result of oxide-zeolite interaction,and this interaction leads to the generation of more NH_(4)^(+)species bound to the Br?nsted acid sites and more reactive NOxspecies absorbed on the Mn ***,we report our mechanistic understanding of the oxide-zeolite composite catalyst and its molecular pathway for improving the low-temperature activity and N_(2) selectivity for NH_(3)-SCR ***,this work may provide an alternative methodology for low-temperature NO_(x) control from diesel vehicles.

关键词： Selective catalytic reduction Mn-based catalysts Hydrothermal stability N_(2) selectivity

Activation of dislocations in Mg with solute Y

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Journal of Magnesium and Alloys 2024年第3期12卷 1045-1053页

作者： Alireza Maldar Leyun Wang Boyu liu Wenjun liu Zhaohui Jin Bijin Zhou Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Advanced Photon Source Argonne National LaboratoryIL 60439USA Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China

Mg-Y cast alloy shows excellent ductility(elongation to failure>15%)compared with pure Mg and commercial Mg cast *** monitoring the microstructure evolution during an in situ tensile test of a Mg-2.5 wt%Y alloy,we identify the activation of prismaticslip,which is rare in *** X-ray micro-beam Laue diffraction(μ-Laue)and transmission electron microscopy revealed the morphology of prismaticslip bands and individual*** functional theory and molecular dynamics calculations indicate that solute Y can significantly reduce the stacking fault energy(SFE)alongdirection on prismatic plane in Mg lattice and thus facilitate the nucleation ofdislocations during *** presence of freedislocations in the Mg lattice can also lead to nucleation of{10–12}twins even under unfavorable geometric conditions.

关键词： alloy microstructure ductility

Effect of bubble morphology and behavior on power consumption in non-Newtonian fluids’aeration process

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Chinese Journal of Chemical Engineering 2024年第1期65卷 243-254页

作者： Xiemin liu Jing Wan Jinnan Sun Lin Zhang Feng Zhang Zhibing Zhang Xinyao Li Zheng Zhou Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE) School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116045China

Due to a prolonged operation time and low mass transfer efficiency, the primary challenge in the aeration process of non-Newtonian fluids is the high energy consumption, which is closely related to the form and rate of impeller, ventilation, rheological properties and bubble morphology in the reactor. In this perspective, through optimal computational fluid dynamics models and experiments, the relationship between power consumption, volumetric mass transfer rate(kLa) and initial bubble size(d0) was constructed to establish an efficient operation mode for the aeration process of non-Newtonian fluids. It was found that reducing the d0could significantly increase the oxygen mass transfer rate, resulting in an obvious decrease in the ventilation volume and impeller speed. When d0was regulated within 2-5 mm,an optimal kLa could be achieved, and 21% of power consumption could be saved, compared to the case of bubbles with a diameter of 10 mm.

关键词： Non-Newtonian fluids aeration process Power consumption Volumetric mass transfer rate Bubble size

Hypomethylation of glycine dehydrogenase promoter in peripheral blood mononuclear cells is a new diagnostic marker of hepatitis B virus-associated hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2024年第1期23卷 35-42页

作者： Li-Li Miao Jing-Wen Wang Hui-Hui liu Shuai gao Yu-Chen Fan Kai Wang department of Hepatology Qilu Hospital of Shandong UniversityJinan 250012China Experimental Center Shandong University of Traditional Chinese MedicineJinan 250355China Institute of Hepatology Shandong UniversityJinan 250012China

Background: glycine dehydrogenase(gLDC) plays an important role in the initiation and proliferation of several human cancers. In this study, we aimed to detect the methylation status of gLDC promoter and its diagnostic value for hepatitis B virus-associated hepatocellular carcinoma(HBV-HCC). Methods: We enrolled 197 patients, 111 with HBV-HCC, 51 with chronic hepatitis B(CHB), and 35 healthy controls(HCs). The methylation status of gLDC promoter in peripheral mononuclear cells(PBMCs) was identified by methylation specific polymerase chain reaction(MSP). The mRNA expression was examined using real-time quantitative polymerase chain reaction(q PCR). Results: The methylation frequency of the gLDC promoter was significantly lower in HBV-HCC patients(27.0%) compared to that in CHB patients(68.6%) and HCs(74.3%)( P group had lower alanine aminotransferase level( P = 0.035) and lower rates of tumor node metastasis(TNM) Ⅲ/Ⅳ( P = 0.043) and T3/T4( P = 0.026). TNM stage was identified to be an independent factor for gLDC promoter methylation. gLDC mRNA levels in CHB patients and HCs were significantly lower than those in HBV-HCC patients( P = 0.022 and P gLDC mRNA levels were significantly higher in HBV-HCC patients with unmethylated gLDC promoters than those with methylated gLDC promoters( P = 0.003). The diagnostic accuracy of alpha-fetoprotein(AFP) combined with gLDC promoter methylation for HBV-HCC was improved compared with that of AFP alone(AUC: 0.782 vs. 0.630, P gLDC promoter methylation was an independent predictor for overall survival of HBV-HCC patients( P = 0.038). Conclusions: The methylation frequency of gLDC promoter was lower in PBMCs from HBV-HCC patients than that from patients with CHB and HCs. The combination of AFP and gLDC promoter hypomethylation significantly improved the diagnostic accuracy of HBV-HCC.

关键词： Hepatocellular carcinoma glycine dehydrogenase DNA methylation Peripheral blood mononuclear cells

Metabolomic Analysis in Saliva and Different Brain Regions of Older Mice with Postoperative delirium Behaviors

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Biomedical and Environmental Sciences 2024年第2期37卷 133-145页

作者： liu Xiao CAO Ying LIN Xiao Wan gAO Dan Yang MIAO Hui Hui LI Tian Zuo department of Anesthesiology Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China

Objective Postoperative delirium(POD)has become a critical challenge with severe consequences and increased incidences as the global population ***,the underlying mechanism is yet *** study aimed to explore the changes in metabolites in three specific brain regions and saliva of older mice with postoperative delirium behavior and to identify potential non-invasive *** Eighteen-month-old male C57/BL6 mice were randomly assigned to the anesthesia/surgery or control *** tests were conducted 24 h before surgery and 6,9,and 24 h after *** C3(C3)and S100 calcium-binding protein B protein(S100beta)levels were measured in the hippocampus,and a metabolomics analysis was performed on saliva,hippocampus,cortex,and amygdala *** In total,43,33,38,and 14 differential metabolites were detected in the saliva,hippocampus,cortex,and amygdala,respectively.“Pyruvate”“alpha-linolenic acid”and“2-oleoyl-1-palmitoy-snglycero-3-phosphocholine”are enriched in one common pathway and may be potential non-invasive biomarkers for *** changes were observed in the three brain regions,with the upregulation of 1-methylhistidine and downregulation of *** Dysfunctions in energy metabolism,oxidative stress,and neurotransmitter dysregulation are implicated in the development of *** identification of changes in the level of salivary metabolite biomarkers could aid in the development of noninvasive diagnostic methods for POD.

关键词： Metabolomic Postoperative delirium(POD) Mechanism Biological marker

Innovative insights into extrachromosomal circular DNAs in gynecologic tumors and reproduction

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Protein & Cell 2024年第1期15卷 6-20页

作者： Ning Wu Ling Wei Zhipeng Zhu Qiang liu Kailong Li Fengbiao Mao Jie Qiao Xiaolu Zhao State Key Laboratory of Female Fertility Promotion Center for Reproductive MedicineDepartment of Obstetrics and GynecologyCenter for Reproductive MedicinePeking University Third HospitalBeijing 100191China National Clinical Research Center for Obstetrics and gynecology Peking University Third HospitalBeijing 100191China Key Laboratory of Assisted Reproduction(Peking University) Ministry of EducationBeijing 100191China Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology Beijing 100191China Institute of Medical Innovation and Research Peking University Third HospitalBeijing 100191China Cancer Center Peking University Third HospitalBeijing 100191China department of Biochemistry and Biophysics Beijing Key Laboratory of Protein Posttranslational Modifications and Cell FunctionSchool of Basic Medical SciencesPeking University Health Science CenterBeijing 100191China Beijing Advanced Innovation Center for genomics Beijing 100191China Peking-Tsinghua Center for Life Sciences Peking UniversityBeijing 100191China

Originating but free from chromosomal DNA,extrachromosomal circular DNAs(eccDNAs)are organized in circular form and have long been found in unicellular and multicellular *** biogenesis and function are poorly understood as they are characterized by sequence homology with linear DNA,for which few detection methods are *** advances in high-throughput sequencing technologies have revealed that eccDNAs play crucial roles in tumor formation,evolution,and drug resistance as well as aging,genomic diversity,and other biological processes,bringing it back to the research *** mechanisms of eccDNA formation have been proposed,including the breakage-fusion-bridge(BFB)and translocation-deletion-amplification *** tumors and disorders of embryonic and fetal development are major threats to human reproductive *** roles of eccDNAs in these pathological processes have been partially elucidated since the first discovery of eccDNA in pig sperm and the double minutes in ovarian cancer *** present review summarized the research history,biogenesis,and currently available detection and analytical methods for eccDNAs and clarified their functions in gynecologic tumors and *** also proposed the application of eccDNAs as drug targets and liquid biopsy markers for prenatal diagnosis and the early detection,prognosis,and treatment of gynecologic *** review lays theoretical foundations for future investigations into the complex regulatory networks of eccDNAs in vital physiological and pathological processes.

关键词： extrachromosomal circular DNAs gynecologic tumors reproduction liquid biopsy non-invasive prena-tal testing

基于真实情境的“烃的衍生物”主题式复习教学设计——认识肉桂酸乙酯

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化学教育（中英文） 2024年第9期45卷 54-60页

作者：谢德莉郑柳萍刘楚龙福建师范大学化学与材料学院福建福州350007

为拓宽学生的化学视野,丰富学生的实践应用能力,以“烃的衍生物”复习课为例,介绍了在高中有机化学内容复习中采用“主题式复习”的意义和流程。将“认识肉桂酸乙酯”作为真实情境开展主题式复习,在“结构探究、性质探究、合成探究”3... 详细信息

为拓宽学生的化学视野,丰富学生的实践应用能力,以“烃的衍生物”复习课为例,介绍了在高中有机化学内容复习中采用“主题式复习”的意义和流程。将“认识肉桂酸乙酯”作为真实情境开展主题式复习,在“结构探究、性质探究、合成探究”3个环节引导学生类比分析相关图谱和科研成果、推断解决真实的综合性问题,从而构建有机物结构测定、性质与结构关系以及逆向合成的认知模型,进一步形成化学学科的核心观念。

关键词：真实情境主题式复习肉桂酸乙酯烃的衍生物

Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed

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International Journal of Coal Science & Technology 2024年第1期11卷 119-132页

作者： Lirui Mao Mingdong Zheng Baolia.g Xia Facun Jiao Tao liu Yuanchun Zhang Shengtao gao Hanxu Li School of Chemical Engineering Anhui University of Science and TechnologyHuainan232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan232001China Insititute of Energy Hefei Comprehensive National Science CenterHefei230031China

Fine slag(FS)is an unavoidable by-product of coal ***,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restricting the development of energy-saving coal gasification *** multiscale analysis of FS performed in this study indicates typical grain size distribution,composition,crystalline structure,and chemical bonding *** FS primarily contained inorganic and carbon components(dry bases)and exhibited a"three-peak distribution"of the grain size and regular spheroidal as well as irregular *** irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and *** carbon constituents were primarily amorphous in structure,with a certain degree of order and active sites.C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic *** inorganic components,constituting 90%of the total sample,were primarily silicon,aluminum,iron,and *** inorganic components contained Si–O-Si,Si–O–Al,Si–O,SO_(4)^(2−),and Fe–O *** 2p XPS spectrum could be deconvoluted into Fe 2p_(1/2) and Fe 2p_(3/2) peaks and satellite peaks,while Fe existed mainly in the form of Fe(III).The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future.

关键词： Coal gasification Fine slag Multiscale analysis Carbon components Inorganic components

Highly efficient separation of Sc3+ and Y3+ in acid solution by a graphene oxide membrane with interlayer sieving

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Journal of Rare Earths 2024年第11期42卷 2166-2171页

作者： Huixiong Jiang Jin-Hang liu Xiudong Chen Xiaohua Cao Xiushen Ye guosheng Shi School of Chemistry and Chemical Engineering Jiangxi Province Engineering Research Center of Ecological Chemical IndustryJiujiang University Shanghai Applied Radiation Institute State Key Lab.Advanced Special SteelShanghai University Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of Sciences

Sc and Y are key rare earth elements and are widely used in lamp phosphors,lasers and high-performance ***,highly efficient extraction and separation of Sc3+and Y3+is laborious,harmful,slow,and costly,strongly necessitating more efficient extraction and separation ***,we produced hydrated Sc3+-and hydrated Y3+-controlled graphene oxide（gO） membranes and find that both hydrated cations were completely self-rejected by the *** combining this selfrejection effect of the larger hydrated Y3+-controlled gO membrane and the rapid passage of the membrane through the smaller hydrated Sc3+,we proposed a strategy to separate Sc3+and Y3+by using a hydrated Y3+-controlled gO *** experimental results show that the permeation rate of Sc3+exceeds that of Y3+when the separation factor reaches 4.02,which can be attributed to the interlayer sieving effects of the gO *** finding illustrates the use of a forward osmosis process with a gO membrane for the efficient separation of Sc3+and Y3+by interlayer sieving,which provides a new effective and eco-friendly method for the separation of rare earth elements.

关键词： Forward osmosis graphene oxide membrane Interlayer spacing Membrane separation Rare earths