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Journal of Energy Chemistry 2025年第1期100卷 215-225页

作者： Jiaye Li Shuang Pan Yihuang Chen Qiong Liu College of Chemistry and Materials Engineering Wenzhou University Guangdong Provincial Key laboratory of Chemical Measurement and Emergency test Technology (China) Institute of Analysis Guangdong Academy of Sciences (China National Analytical CenterGuangzhou)

Photocatalytic oxygen reduction for hydrogen peroxide （H2O2） synthesis presents a green and costeffective production ***,achieving highly selective H2O2synthesis remains challenging,necessitating precise control over free radical reaction pathways and minimizing undesirable oxidative ***,we report for the visible light-driven simultaneous co-photocatalytic reduction of O2to H2O2and oxidation of biomass using the atomic rubidium-nitride modified carbon nitride（CNRb）.The optimized CNRb catalyst demonstrates a record photoreduction rate of 8.01 mM h-1for H2O2generation and photooxidation rate of 3.75 mM h-1for furfuryl alcohol to furoic acid,achieving a remarkable solar-to-chemical conversion （SCC） efficiency of up to 2.27%.Experimental characterizations and DFT calculation disclosed that the introducing atomic Rb–N configurations allows for the high-selective generation of superoxide radicals while suppressing hydroxyl free radical *** is because the Rb–N serves as the new alternative site to perceive a stronger connection position for O2adsorption and reinforce the capability to extract protons,thereby triggering a high selective redox product *** study holds great potential in precisely regulating reactive radical processes at the atomic level,thereby paving the way for efficient synthesis of H2O2coupled with biomass valorization.

关键词： Atomic economy Radical pathway regulation Rubidium atom coordination Biomass valorization

Regulated emission characteristics of in-use LNG and diesel semi-trailer towing vehicles under real driving conditions using PEMS

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Journal of Environmental Sciences 2020年第2期32卷 155-164页

作者： Liqun Lv Yunshan Ge Zhe Ji Jianwei Tan Xin Wang Lijun Hao Zhiwei Wang Mengzhu Zhang Chunjie Wang Haidan Liu national laboratory of auto performance&emission test School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Vehicle emission Control Center Chinese Research Academy of Environmental SciencesBeijing 100081China Tangshan Environmental Monitoring Centre Tangshan 063000China

On-road driving emissions of six liquefied natural gas(LNG) and diesel semi-trailer towing vehicles(STTVs) which met China emission Standard IV and V were tested using Portable emission Measurement System(PEMS) in northern *** characteristics of these vehicles under real driving conditions were analyzed and proved that on-road emissions of heavy-duty vehicles(HDVs) were underestimated in the *** were large differences among LNG and diesel vehicles, which also existed between China V vehicles and China IV *** factors showed the highest level under real driving conditions, which probably be caused by frequent acceleration, deceleration, and *** emission factors ranged from 2.855 to 20.939 g/km based on distance-traveled and 6.719–90.557 g/kg based on fuel consumption during whole tests, which were much higher than previous researches on chassis *** was inferred from tests that the fuel consumption rate of the test vehicles had a strong correlation with NOx emission, and the exhaust temperature also affected the efficiency of Selected Catalytic Reduction(SCR) aftertreatment system, thus changing the NOx emission *** emission factors of LNG vehicles were 2.012–10.636 g/km, which were much higher than that of diesel vehicles(0.029–0.185 g/km).Unburned CH4 may be an important reason for this *** on-road emission tests, especially CH4 emission test should be carried out in subsequent *** addition, the Particulate Number(PN) emission factors of diesel vehicles were at a very high level during whole tests, and Diesel Particulate Filter(DPF)should be installed to reduce PN emission.

关键词： Semi-trailer towing vehicles Regulated emission PEMS

Unregulated emissions from diesel engine with particulate filter using Fe-based fuel borne catalyst

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Journal of Environmental Sciences 2014年第10期26卷 2027-2033页

作者： Hong Zhao Yunshan Ge Tiezhu Zhang Jipeng Zhang Jianwei Tan Hongxin Zhang College of Mechanical & Electronic Engineering Qingdao University national Lab of auto performance & emission test Beijing Institute of Technology

The alteration and formation of toxic compounds and potential changes in the toxicity of emissions when using after-treatment technologies have gained wide attention. Volatile organic compound（VOC）, carbonyl compound and particle-phase polycyclic aromatic hydrocarbon（PAH） emissions were tested at European Steady State Cycle（ESC） to study unregulated emissions from a diesel engine with a fuel-borne catalyst and diesel particulate filter（FBC–DPF）. An Fe-based fuel-borne catalyst was used for this study. According to the results, brake specific emissions of total VOCs without and with DPF were 4.7 and4.9 mg/kWh, respectively, showing a 4.3% increase. Benzene and n-undecane emissions increased and toluene emission decreased, while other individual VOC emissions basically had no change. When retrofitted with the FBC–DPF, total carbonyl compound emission decreased 15.7%, from 25.8 to 21.8 mg/kWh. The two highest carbonyls, formaldehyde and acetaldehyde, were reduced from 20.0 and 3.7 to 16.5 and 3.3 mg/kWh respectively. The specific reactivity（SR） with DPF was reduced from 6.68 to 6.64 mg/kWh. Total particle-phase PAH emissions decreased 66.4% with DPF compared to that without DPF. However, the Benzo[a]pyrene equivalent（BaPeq） with DPF had increased from 0.016 to 0.030 mg/*** and Pyrene had the greatest decrease, 91.1% and 88.4% respectively. The increase of two- and three-ring PAHs with DPF indicates that the fuel-borne catalyst caused some gas-phase PAHs to adsorb on particles. The results of this study expand the knowledge of the effects of using a particulate filter and a Fe-based fuel-borne catalyst on diesel engine unregulated emissions.

关键词： Fuel-borne catalyst DPF VOCs Carbonyl compounds Particle-phase PAHs

High NO_2/NO_X emissions downstream of the catalytic diesel particulate filter:An influencing factor study

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Journal of Environmental Sciences 2015年第9期27卷 55-61页

作者： Chao He Jiaqiang Li Zhilei Ma Jianwei Tan Longqing Zhao School of Mechanical and Traffic Engineering Southwest Forestry University national Lab of auto performance and emission test Beijing Institute of Technology

Diesel vehicles are responsible for most of the traffic-related nitrogen oxide（NO x） emissions,including nitric oxide（NO） and nitrogen dioxide（NO2）. The use of after-treatment devices increases the risk of high NO2/NO x emissions from diesel engines. In order to investigate the factors influencing NO2/NO x emissions, an emission experiment was carried out on a high pressure common-rail, turbocharged diesel engine with a catalytic diesel particulate filter（CDPF）. NO2 was measured by a non-dispersive ultraviolet analyzer with raw exhaust sampling. The experimental results show that the NO2/NO x ratios downstream of the CDPF range around 20%–83%, which are significantly higher than those upstream of the CDPF. The exhaust temperature is a decisive factor influencing the NO2/NO x emissions. The maximum NO2/NO x emission appears at the exhaust temperature of 350°C. The space velocity,engine-out PM/NO x ratio（mass based） and CO conversion ratio are secondary factors. At a constant exhaust temperature, the NO2/NO x emissions decreased with increasing space velocity and engine-out PM/NO x ratio. When the CO conversion ratios range from 80% to 90%,the NO2/NO x emissions remain at a high level.

关键词： Diesel engine Nitrogen dioxide Diesel particulate filter Exhaust temperature Space velocity

An assessment of how distance and diesel oxidation catalyst will impact thermal decomposition behaviors of particles

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Journal of Environmental Sciences 2020年第4期32卷 157-169页

作者： Mengzhu Zhang Yunshan Ge Chuanzhen Zhang Xin Wang national laboratory of auto performance and emission test Beijing Institute of TechnologyBeijing100081China Baic Motor Corporation LTD. Beijing101300China

Decomposition mass loss and pyrolysis products analyses of particles sampled at various locations along the tailpipe of a Euro-IV diesel engine were performed using a thermo gravimetry in conjunction with Fourier transformation infrared spectrometrymass *** particles were collected at the same location with and without diesel oxidation catalyst(DOC)mounted on the test engine *** three poles in thermal gravity-differential thermal gravity images suggested that the decomposition process of diesel particles could be divided into three stages which correspond to the decompositions of lower boiling substances,higher boiling substances and soot *** is noticed that no matter whether DOC was mounted or not,the further the particles were sampled away from the engine block,the lower the peak temperatures and the heavier the mass losses within the first two stages,which indicated that the soluble organic fraction in the particle samples increased and therefore lowering the activation energy of thermal ***,ammonia,C_xH_y fragments,benzene,toluene,and phenol were found to be the primary products of particle decomposition,which didn’t change with the location of particle sample *** employment of DOC increased the activation energy for particle oxidation and resulted in a higher peak temperature and lower mass loss within the ***,the C=O stretching bands of aldehyde and ketone at 1771 cm-1 was only detected without a DOC,while the N02 peak at 1634 cm-1 was solely noticed with the presence of *** to the first-stage pyrolysis products,more polycyclic aromatic hydrocarbons and less C_xH_y fragments were seen in the second-stage.

关键词： Transport distance Diesel oxidation catalyst Thermal decomposition Pyrolysis products Particle

A comparative study of particle size distribution from two oxygenated fuels and diesel fuel

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Frontiers of Environmental Science & Engineering 2010年第1期4卷 30-34页

作者： Xiaoyan SHI Kebin HE Jie ZHANG Yongliang MA Yunshan GE Jianwei TAN Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China national laboratory of auto performance and emission test Beijing Institute of TechnologyBeijing 100081China

Oxygenated fuels are known to reduce particulate matter(PM)emissions from diesel *** this study,100%soy methyl ester(SME)biodiesel fuel(B100)and a blend of 10%acetal denoted by A-diesel with diesel fuel were tested as oxygenated *** size and number distributions from a diesel engine fueled with oxygenated fuels and base diesel fuel were measured using an Electrical Low Pressure Impactor(ELPI).Measurements were made at ten steady-state operational modes of various loads at two engine *** was found that the geometric mean diameters of particles from SME and Adiesel were lower than that from base diesel *** to diesel fuel,SME emitted more ultra-fine particles at rated speed while emitting less ultra-fine particles at maximum ***-fine particle number concentrations of A-diesel were much higher than those of base diesel fuel at most test modes.

关键词： oxygenated fuel diesel particulate matter particle size distribution biofuel

Numerical model of on-road emission rates of diesel buses in Beijing

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Journal of Beijing Institute of Technology 2011年第3期20卷 359-364页

作者：王爱娟葛蕴珊谭建伟丁焰余林啸冯向宇郭佳栋 national laboratory of auto performance & emission test School of Mechanical EngineeringBeijing Institute of Technology Beijing Electric Vehicle Co Ltd Chinese Research Academy of Environmental Sciences

A total of 14 in-use diesel buses were selected to conduct emission measurement using a portable emissions measurement system （PEMS） in Beijing. Their instantaneous gaseous emission rates, particular matter （PM） emission rates and driving parameters were obtained. The influences of speed, acceleration and vehicle specific power （VSP） on emissions were analyzed. Based on the relationships between these driving parameters and emissions, 24 driving bins defined by speed, ac- celeration and VSP were constructed with cluster analysis to group emission rates for Euro Ⅲ and IV buses, respectively. Then the emissions reductions from Euro Ⅲ to Euro Ⅳ diesel buses were ana- lyzed. Lastly, on-road hot-stabilized emission rate model for diesel buses in Beijing was developed. Through the comparison of the model simulation emission rates with the measured emission rates, the modeled emission results were in good agreement with the measured emission results. In most of the cases, the differences were less than 12 %.

关键词： driving patterns vehicle specific power (VSP) portable emissions measurement sys-tem (PEMS) cluster analysis emission model

Characterization of polycyclic aromatic hydrocarbon emissions from diesel engine retrofitted with selective catalytic reduction and continuously regenerating trap

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Journal of Environmental Sciences 2012年第8期24卷 1449-1456页

作者： Asad Naeem Shah Yunshan Ge Jianwei Tan Zhihua Liu Chao He Tao Zeng national Lab of auto performance and emission test School of Mechanical and Vehicular EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering University of Engineering and TechnologyLahore 54000Pakistan

Two after treatment units, selective catalytic reduction （SCR） and continuously regenerating trap （CRT）, were independently retrofitted to a diesel engine, with the objective to investigate their impact on the conversion/reduction （CR） of polycyclic aromatic hydrocarbons （PAHs）. The experiments were conducted under the European steady state cycle （ESC） first without any retrofits to get baseline emissions, and then with SCR and CRT respectively, on the same engine. The particulate matter （PM）-phase PAHs were trapped in fiberglass filters, whereas gas-phase PAHs were collected in cartridges, and then analyzed using a gas chromatograph-mass spectrometer （GC-MS）. Both PM-phase and gas-phase PAHs were greatly reduced with CRT showing respective CR of 90.7% and above 80%, whereas only gas-phase PAHs were abated in the case of SCR, with CR of above 75%. Lower molecular weight （LMW） PAHs were in abundance, while naphthalene exhibited a maximum relative contribution （RC） to LMW-PAHs for all three cases. Further, the CR of naphthalene and anthracene were increased with increasing catalyst temperature of SCR, most likely due to their conversion to solid particles. Moreover, the Benzo[a]Pyrene equivalent （BaPeq） of PAHs was greatly reduced with CRT, owing to substantial reduction of total PAHs.

关键词： diesel engine continuously regenerating trap urea-selective catalytic reduction polycyclic aromatic hydrocarbons unregulated emissions

Research on ammonia emissions characteristics from light-duty gasoline vehicles

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Journal of Environmental Sciences 2021年第8期33卷 182-193页

作者： Yingshuai Liu Yunshan Ge Jianwei Tan Haili Wang Yan Ding Weifang University of Science and Technology Weifang 262700China national Lab of auto performance and emission test School of Mechanical and Vehicular EngineeringBeijing Institute of TechnologyBeijing 100081China Vehicle emission Control Center Ministry of Environmental ProtectionBeijing 100012China

In this study,ammonia emissions characteristics of typical light-duty gasoline vehicles were obtained through laboratory vehicle bench test and combined with New European Driving Cycle(NEDC)condition and Worldwide Harmonized Light Vehicles test Cycle(WLTC)*** influence of ambient temperature on ammonia emissions is mainly concentrated in the cold start *** influence of ambient temperature on ammonia emission is shown that the ammonia emissions of light-duty gasoline vehicles under ambient temperature conditions(14 and 23℃)are lower than those under low ambient temperature conditions(-7℃)and high ambient temperature conditions(35 and 40℃).The influence of TWC on ammonia emission is shown that ammonia is a by-product of the catalytic reduction reaction of conventional gas pollutants in the exhaust gas in the *** NEDC operating conditions and WLTC operating conditions,ammonia emissions after the catalyst are 45 times and 72 times that before the catalyst,*** terms of ammonia emissions control strategy research,Pd/Rh combination can reduce NH3 formation more effectively than catalyst with a single Pd *** control of the engine’s air-fuel ratio and combination with the optimized matched precious metal ratio TWC can effectively reduce ammonia emissions.

关键词： Ammonia emissions Light-duty gasoline vehicles Three-way catalytic converter Ambient temperature Air-fuel ratio

Fine-tuning the spatial allocation of phytohormones for smart canopy, smart breeding, and smart agriculture

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Science China Life Sciences 2025年第1期 309-310页

作者： Tao Zhou Lin Li national Key laboratory of Crop Genetic Improvement Huazhong Agricultural University HuBei HongShan laboratory

The dual challenges of global climate change and population growth have increased demand for higher crop yields per unit area. The innovative technology of smart agriculture aims to synergize breeding, cultivation, and production through the application of biological and informatics technologies. Historically, the “Green Revolution” introduced semidwarf varieties of certain key crops by utilizing mutations affecting gibberellin pathways, which significantly increased planting densities and yields.

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