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| 1 | Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China显示文摘To control the spread of the 2019 novel coronavirus(COVID-19),China imposed nationwide restrictions on the movement of its population(lockdown)after the Chinese New Year of 2020,leading to large reductions in economic activities and associated emissions.Despite such large decreases in primary pollution,there were nonetheless several periods of heavy haze pollution in eastern China,raising questions about the well-established relationship between human activities and air quality.Here,using comprehensive measurements and modeling,we show that the haze during the COVID lockdown was driven by enhancements of secondary pollution.In particular,large decreases in NOx emissions from transportation increased ozone and nighttime NO_(3)radical formation,and these increases in atmospheric oxidizing capacity in turn facilitated the formation of secondary particulate matter.Our results,afforded by the tragic natural experiment of the COVID-19 pandemic,indicate that haze mitigation depends upon a coordinated and balanced strategy for controlling multiple pollutants. | Xin Huang Aijun Ding Jian Gao Bo Zheng Derong Zhou Ximeng Qi Rong Tang Jiaping Wang Chuanhua Ren Wei Nie Xuguang Chi Zheng Xu Liangduo Chen Yuanyuan Li Fei Che Nini Pang Haikun Wang Dan Tong Wei Qin Wei Cheng Weijing Liu Qingyan Fu Baoxian Liu Fahe Chai Steven JDavis Qiang Zhang Kebin He | 2021 | National Science Review2021，8，2： | 47 |
| 2 | Au/LaVO_(4)Nanocomposite:Preparation,Characterization,and Catalytic Activity for CO Oxidation显示文摘The size of the gold particles is a very important parameter to get active catalysts.This paper reports a novel colloidal deposition method to prepare Au/LaVO_(4)nanocomposite catalyst with monodispersed Au colloids and uniform LaVO_(4)nanoplates in nonpolar solvent.Monodispersed Au colloids with tunable size(such as 2,5,7,11,13,and 16 nm)and LaVO_(4)nanocrystals with well-defi ned shapes were pre-synthesized assisted with oleic acid/amine.During the following immobilization process,the particle size and shape of Au and LaVO_(4)were nearly preserved.As-prepared Au/LaVO_(4)nanocomposite showed high catalytic activity for CO oxidation at room temperature.Since sizes of gold particles were well-defi ned before the immobilization process,size effect of gold particles was easy to be investigated and the results show that 5-nm Au/LaVO_(4)nanocomposite has the highest activity for CO oxidation.This synthetic method can be extended further for the preparation of other composite nanomaterials. | Junfeng Liu Wei Chen Xiangwen Liu Kebin Zhou Yadong Li | 2008 | Nano Research2008，1，1： | 16 |
| 3 | Ordered two-dimensional porous Co3O4 nanosheets as electrocatalysts for rechargeable Li-O2 batteries显示文摘Lithium-oxygen batteries have attracted considerable interest in the past a few years, because they have higher theoretical specific energy than Li-ion batteries. However, the available en ergy den sities of the Li-O2 batteries are much less than expected. It is particularly urgent to find catalyst with high activity. Herein, a series of Co3O4 with differe nt morphologies (ordered two-dimensio nal porous nano sheets, flowerlike and cuboidlike) were successfully prepared through facile hydrothermal and calcinatio n methods. Ordered two-dime nsional Co3O4 nano sheets show the best cycling stability. Detailed experimental results reveal that the superiority of the unique two-dimensional uniform porous structures is vital for Li-O2 batteries cathode catalysts. Due to the ordered structures with high surface areas and active sites, the catalysts indicate a high specific discharge capacity of about 10,417 mAh/g at a current density of 200 mA/g, and steadily cycle for more than 50 times with a limited capacity of 1,000 mAh/g. | Yu Zhang Mingzhen Hu Mengwei Yuan Genban Sun Yufeng Li Kebin Zhou Chen Chen Caiyun Nan Yadong Li | 2019 | Nano Research2019，12，2： | 3 |
| 4 | The impact of transportation control measures on emission reductions during the 2008 Olympic Games in Beijing, China显示文摘 | Yu Zhou Ye Wu Liu Yang Lixin Fu Kebin He Shuxiao Wang Jiming Hao Jinchuan Chen Chunyan Li | 2009 | Atmospheric Environment2009，，3： | 2 |
| 5 | Pd/sulfated alumina a novel catalyst for selective catalytic reduction of NO with methane显示文摘 | Zhou Kebin Chen Hongde Tian Qun | 2002 | Journal of Molecular Catalysis A: Chemical2002，189，2： | 1 |
| 6 | Monoradically luminescent polymers by a super acid-catalyzed polymerization and deep-red electroluminescence显示文摘Luminescent radicals have received great attention recently due to their idiographic luminescent properties and potential 100%utilization efficiency of doublets under electrical excitation.However,luminescent radical polymers are rarely explored owing to their challenging molecular design and synthesis.Herein,we report an efficient approach to construct luminescent radical polymers by a super acid-catalyzed polymerization reaction proceeded at room temperature,which intrinsically avoid the heavy metal catalyst.The obtained polymers exhibit the unique paramagnetic signals,good thermal properties,and excellent photostability.Moreover,the quantifiable electroluminescence of such radical polymers was demonstrated for the first time. | Kebin An Guohua Xie Shaolong Gong Zhanxiang Chen Xiang Zhou Fan Ni Chuluo Yang | 2020 | Science China Chemistry2020，63，9： | 1 |
| 7 | Enhanced Catalytic Activity of Ceria Nanorods from Well-Defined Reactive Crystal Planes显示文摘 | ZHOU Kebin XUN Wang SUN Xiaoming | 2005 | Journal of Catalysis2005，229，1： | 1 |
| 8 | Pd-containing perovskite-type oxides used for three-way catalysts显示文摘 | Kebin Zhou | 2002 | Journal of Molecular Catalysis A:Chemical2002，189，： | 1 |
| 9 | Synthesis,characterization and catalytic properties of Cu O nanocrystals with various shapes显示文摘 | Zhou Kebin Wang Ruipu Xu Boqing | 2006 | Nanotechnology2006，17，15： | 1 |
| 10 | The impact of transportation control measures on emission reductions during the 2008 Olympic Games in Beijing, China显示文摘 | Yu Zhou Ye Wu Liu Yang Lixin Fu Kebin He Shuxiao Wang Jiming Hao Jinchuan Chen Chunyan Li | 2009 | Atmospheric Environment2009，，3： | 1 |
| 11 | Effect of SiO_(2)/Al_(2)O_(3)ratio on the conversion of methanol to olefins over molecular sieve catalysts显示文摘A series of SAPO-34 molecular sieves with different SiO_(2)/Al_(2)O_(3)ratios have been synthesized for the methanol-to-olefin(MTO)reaction.Their physico-chemical properties are characterized by various techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FT-IR)and N2 adsorption-desorption.The results are compared with those of the commercial HZSM-5,which show that the crystallinity and particle diameter of SAPO-34 as well as HZSM-5 increase with SiO_(2)/Al_(2)O_(3)ratio.The variation of BET surface area of SAPO-34 is different from that of HZSM-5 and the sample with SiO_(2)/Al_(2)O_(3)ratio of 0.4 exhibits the highest BET surface area.FT-IR spectra indicate that HZSM-5 has both Brǿnsted and Lewis acid sites and Brǿnsted acid sites are stronger,whereas SAPO-34 samples are dominated only by Lewis acid sites.When the SiO_(2)/Al_(2)O_(3)ratio increases,propylene and butylenes become the predominant product of the MTO reaction over HZSM-5.In contrast,the main products of this reaction catalyzed by SAPO-34 are ethylene and propylene.According to the product distribution,the reaction mechanism over HZSM-5 catalysts is proposed. | Qian WANG Lei WANG Hui WANG Zengxi LI Xiangping ZHANG Suojiang ZHANG Kebin ZHOU | 2011 | Frontiers of Chemical Science and Engineering2011，5，1： | 1 |
| 12 | Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes显示文摘 | Kebin Zhou Xun Wang Xiaoming Sun Qing Peng Yadong Li | 2004 | Journal of Catalysis2004，，1： | 1 |
| 13 | Historical evaluation of vehicle emission control in Guangzhou based on a multi-year emission inventory显示文摘 | Shaojun Zhang Ye Wu Huan Liu Xiaomeng Wu Yu Zhou Zhiliang Yao Lixin Fu Kebin He Jiming Hao | 2013 | Atmospheric Environment2013，，： | 1 |
| 14 | Highly spatial and temporal bottom-up vehicle emission characterization and its control in a typical ecology-preservation area显示文摘The Chishui River Valley is a microscale ecology-preservation area with industrial clusters.The significance of evaluating vehicular emissions has been gradually highlighted with the rapid development of the local transportation and tourism sectors.This study provides the first estimates based on both bottom-up and top-down approaches.The annual total emissions of CO,NOx,hydrocarbons(HC),PM10,and PM2.5 in 2019 were 347.8,189.6,46.3,6.9,and 6.3 Mg,respectively.Trucks contributed the most(55%)to the NOx emissions,followed by heavy-duty passenger vehicles(26%).In contrast,light-duty passenger vehicles and motorcycles generated 75%of the HC emissions.The superior accuracy of highly spatial and temporal bottom-up estimates versus top-down estimates is validated by the similar variation trends of hourly emission intensities and enhanced concentrations relative to background observations for both NOx and CO,with Pearson correlation coefficients between the intensities and concentrations ranging from 0.79 to 0.85.Historical HC emissions peaked in 2013,followed by a sharp decline in 2014 and a continuous rise since then,whereas NOx emissions have kept increasing since 2010.These indicated the necessity and urgency of effective vehicular emission mitigations.Based on scenario analysis,traffic restrictions combined with upgrading the emission standards of admitted vehicles will possess huge emission reduction potentials.Future recommendations about establishing a low emission zone in the valley and supporting policies were introduced. | Pengju Bie Fanyuan Deng Bi Chen Li Wang Fan Yang Jianguo Zhou Huan Liu Kebin He | 2022 | Eco-Environment & Health2022，1，3： | 0 |
| 15 | Coherent Mutually Pumped Phase Conjugation Induced with High-Efficiency by Self-Pumped Phase Conjugate Reflection显示文摘A new scheme of coherent mutually pumped phase conjugate(MPPC)reflection that depends on the formation of self-pumped phase conjugate reflection of another beam has been demonstrated in a Cu:KNSBN crystal.The dependences of the MPPC reflectivity on the intensity ratio of the two incident beams and on the incident position of the signal beam were measured.We obtain phase conjugate reflectivities of greater than 90%at 488nm. | SUN Xiudong ZHANG Jingwen ZHOU Zhongxiang XU Kebin HONG Jing JIANG Quanzhong CHEN Huanchu ZHU Guizhi | 1995 | Chinese Physics Letters1995，12，9： | 0 |
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