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Influence of ambient temperature on the CO_(2)emitted of light-duty vehicle

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Journal of Environmental Sciences 2024年第6期140卷 59-68页

作者： Dan Tan Yachao Wang Jianwei Tan Jiachen Li Changyu Wang Yunshan Ge School of Mechanical engineering Beijing Institute of TechnologyBeijing 100081China

Because of global warming,people have paid more attention to greenhouse gas emitted by *** quantify the impact of temperature on vehicle CO_(2)emissions,this study was conducted using the world light vehicle test cycle on two light-duty E10 gasoline vehicles a ambient temperatures of-10,0,23,and 40℃,and found that CO_(2)emission factors of Vehicle1 in the low-speed phase were 22.07%and 20.22%higher than those of Vehicle 2 at cold star and hot start under-10℃.The reason was vehicle 1 had a larger displacement and more friction pairs than vehicle *** was the highest CO_(2)emission at the low-speed phase due to low average speed,frequent acceleration,and *** CO_(2)temperature factor and the ambient temperature had a strong linear correlation(R2=0.99).According to CO_(2)temperature factors and their relationships,CO_(2)emission factors of other ambien temperatures could be calculated when the CO_(2)emission factor of 23℃was obtained,and the method also could be used to obtain the CO_(2)temperature factors of different *** separate the effect of load setting and temperature variation on CO_(2)emission quantitatively a method was *** results showed that the load setting was dominant for the CO_(2)emission *** with 23℃,the CO_(2)emission for vehicle 1 caused by load setting variation were 62.83 and 47.42 g/km,respectively at-10 and 0℃,while those fo vehicle 2 were 45.01 and 35.63 g/km,respectively.

关键词： CO_(2)emission Ambient temperature E10 gasoline Light-duty vehicle WLTC

Co_(3)O_(4)as an efficient passive NO_(x) adsorber for emission control during cold-start of diesel engines

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Chinese Journal of Chemical engineering 2024年第2期66卷 1-7页

作者： Jinhuang Cai Shijie Hao Yun Zhang Xiaomin Wu Zhenguo Li Huawang Zhao Department of Environmental Science&engineering College of Chemical EngineeringHuaqiao UniversityXiamen 361021China Wuxi Weifu Environmental Catalysts Co. LtdWuxi 214000China national engineering laboratory for mobile source emission control technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

The Co_(3)O_(4)nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NO_(x) adsorbent to control the cold start emissions from *** nanoparticles boast a substantial quantity of active chemisorbed oxygen and lattice oxygen,which exhibited a NO_(x) uptake capacity commensurate with Pd/SSZ-13 at 100℃.The primary NO_(x) release temperature falls within a temperature range of 200-350℃,making it perfectly suitable for diesel *** characterization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,contributing to the NO_(x) storage at 100℃,while the nitrites begin to decompose within the 150-200℃***,lattice oxygen likely becomes involved in the activation of nitrites into more stable nitrate within this particular temperature *** concurrent processes of nitrites decomposition and its conversion to nitrates results in a minimal NO_(x) release between the temperatures of 150-200℃.The nitrate formed via lattice oxygen mainly induces the NO_(x) to be released as NO_(2) within a temperature range of 200-350℃,which is advantageous in enhancing the NO_(x) activity of downstream NH_(3)-SCR catalysts,by boosting the fast SCR reaction *** to its low cost,considerable NO_(x) absorption capacity,and optimal release temperature,Co_(3)O_(4)demonstrates potential as an effective material for passive NO_(x) adsorber applications.

关键词： emission control Cold-start Low-temperature adsorption Co_(3)O_(4) Nitrate formation

Efficient NO_x abatement by passive adsorption over a Pd-SAPO-34 catalyst prepared by solid-state ion exchange

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Chinese Chemical Letters 2024年第4期35卷 210-213页

作者： Linhui Liu Wuwan Xiong Mingli Fu Junliang Wu Zhenguo Li Daiqi Ye Peirong Chen national engineering laboratory for VOCs Pollution control technology and Equipment Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution ControlSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China national engineering laboratory for mobile source emission control technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

Palladium-exchanged chabazite(Pd-CHA) zeolites as passive NO_x adsorbers(PNAs) enable efficient purification of nitrogen oxides(NO_x) in cold-start diesel exhausts. Their commercial application, however,is limited by the lack of facile preparation method. Here, high-performance CHA-type Pd-SAPO-34 zeolite was synthesized by a modified solid-state ion exchange(SSIE) method using PdO as Pd precursor,and demonstrated superior PNA performance as compared to Pd-SAPO-34 prepared by conventional wetchemistry strategies. Structural characterization using Raman spectroscopy and X-ray diffraction revealed that the SSIE method avoided water-induced damage to the zeolite framework during Pd loading. Mechanistic investigations on the SSIE process by in situ infrared spectroscopy and X-ray photoelectron spectroscopy disclosed that, while PdO precursor was mainly converted to Pd^(2+) cations coordinated to the zeolite framework by consuming the-OH groups of the zeolite, a portion of PdO could also undergo thermal decomposition to form highly dispersed Pd~0 clusters in the pore channels. This simplified and scalable SSIE method paves a new way for the cost-effective synthesis of defect-free high-performance Pd-SAPO-34 zeolites as PNA catalysts.

关键词： Pd-SAPO-34 Passive NO_x adsorber Pd loading Solid-state ion exchange Pd transformation

Advances in selective catalytic oxidation of ammonia (NH_(3)-SCO): A review of catalyst structure-activity relationship and design principles

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Chinese Chemical Letters 2024年第1期35卷 169-180页

作者： Zhao Li Chunxue Wang Junjun Qiu Yixing Ma Chi Wang Xin Sun Kai Li Ping Ning Fei Wang Faculty of Environmental Science and engineering Kunming University of Science and TechnologyKunming 650500China national-Regional engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming 650500China Faculty of Chemical engineering Kunming University of Science and TechnologyKunming 650500China

NH_(3) in ambient air directly leads to an increase in the aerosol content in the air. These substances lead to the formation of haze to various environmental problems after atmospheric circulation and diffusion. controlling NH_(3) emissions caused by ammonia escaping from mobile and industrial sources can effectively reduce the NH_(3) content in ambient air. Among the various NH_(3) removal methods, the selective catalytic oxygen method (NH_(3)-SCO) is committed to oxidizing NH_(3) to environmentally harmless H_(2)O and N_(2);therefore, it is the most valuable and ideal ammonia removal method. In this review, the characteristics of loaded and core-shell catalysts in NH_(3)-SCO have been reviewed in the context of catalyst structure-activity relationships, and the H_(2)O resistance and SO2 resistance of the catalysts are discussed in the context of practical application conditions. Then the effects of the valence state of the active center, oxygen species on the catalyst surface, dispersion of the active center and acidic sites on the catalyst performance are discussed comprehensively. Finally, the shortcomings of the existing catalysts are summarized and the catalyst development is discussed based on the existing studies.

关键词： Ammonia Selective catalytic oxidation Active metals and supports Influence of gas composition Reaction mechanism Catalyst structure-activity relationship

γ-AlO形貌调控对PtCo合金化程度在CO-PROX反应中的影响（英文）

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燃料化学学报(中英文) 2024年

作者：宋丽川钟栎锭沈佳娄亚珂郭耘王丽华东理工大学化学与分子工程学院工业催化研究所绿色化工与工业催化国家重点实验室

一氧化碳的优先氧化（CO-PROX）反应是去除H2中微量CO最为有效的方法之一。负载型Pt基催化剂在COPROX中已有了广泛的研究，其催化性能受到载体形貌的影响。本工作通过水热法制备了不同形貌的γ-Al2O3：暴露（110）晶面的花球状γ-Al2O3... 详细信息

一氧化碳的优先氧化（CO-PROX）反应是去除H2中微量CO最为有效的方法之一。负载型Pt基催化剂在COPROX中已有了广泛的研究，其催化性能受到载体形貌的影响。本工作通过水热法制备了不同形貌的γ-Al2O3：暴露（110）晶面的花球状γ-Al2O3（f）、暴露（100）晶面的片状γ-Al2O3（s）、以及暴露（111）晶面的棒状γ-Al2O3（r），随后负载PtCo纳米颗粒。载体的形貌及暴露晶面影响了PtCo纳米颗粒的合金化程度，随着合金化程度的增加，催化剂的活性也随之增强。PtCo/γ-Al2O3（f）上形成了具有特定结构的Pt3Co金属间化合物，其在CO-PROX反应中表现出较高的催化活性，可在50-225℃的宽温度范围内实现CO完全转化，且具有优异的抗H2O和CO2性能；在γ-Al2O3（s）上仅发现PtCo部分合金化；而PtCo/γ-Al2O3（r）中Pt、Co之间没有出现合金化现象，其在50℃下的反应速率仅为PtCo/γ-Al2O3（f）的11%。机理认识表明形成Pt3Co金属间化合物使Pt更偏氧化态，显著削弱了Pt上CO的吸附并增加了活性氧物种，促进了CO的选择氧化。

关键词： PtCo催化剂 γ-Al O 载体形貌 CO优先氧化

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 thermal treatment conditions on redox properties of ceriazirconia materials

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Journal of Rare Earths 2023年第12期41卷 1969-1975,I0005页

作者： Shanshan Li Jie Deng Jianli Wang Yaoqiang Chen Yun Li Key laboratory of Green Chemistry&technology Ministry of EducationCollege of ChemistrySichuan UniversityChengdu610064China College of Chemistry and Chemical engineering Southwest Petroleum UniversityChengdu610500China Center of engineering of Vehicular Exhaust Gases Abatement Sichuan ProvinceChengdu610064China Center of engineering of Environmental Catalytic Material Sichuan ProvinceChengdu610064China Sinocat Environmental technology Co. Ltd.Chengdu611731China

The nanostructures and redox properties of CeO_(2)-ZrO_(2)materials can be tuned via optimized thermal *** this study,the CeO_(2)-ZrO_(2)-Y_(2)O_(3)-La_(2)O_(3)(CZ) materials were prepared by co-precipitation method and submitted to different thermal treatment conditions(atmosphere:nitrogen(N) and air(A);temperature(x):700,800 and 900℃).Due to the protective effects of the "in-situ-formed" carbon powder,treating the surfactants assisted-CZ precursors under N2atmosphere can keep the pore structures and then the CZ-N700 and CZ-N800 can achieve larger surface area than CZ-A700 and CZ-A800,*** comparison,with high treatment temperature(900℃),the effects of thermal atmosphere on surface area can be ***,the redox properties of CZ materials correlate closely with thermal treatment atmosphere and temperature *** demonstrated by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) characterizations,the N_(2)atmosphere facilitates the formation of Ce^(3+)without disturbing the mixing degree of Ce and *** the CZ-Nx materials exhibit superior reducibility than corresponding CZ-Ax *** additio n,the XRD and XPS results also demonstrate the formation of a more homogeneous CZ solid solution by Zr atoms rearrangement with temperature ignoring the *** a result,the reducibility of CZ materials increases with the treatment temperature increasing and is not affected by the worsening of the textural ***,due to the synergistic effects of N_(2)atmosphere and high treatment temperature,the CZ-N900 shows the best *** improvement also emphasizes the important role of structural properties of CZ in explaining the temperature-dependent reducibility.

关键词： CeO_(2)-ZrO_(2)material Thermal treatment Atmosphere and temperature Reducibility Rare earths

Selective catalytic reduction of NO_(x) with NH_(3) assisted by non-thermal plasma over CeMnZrO_(x)@TiO_(2) core–shell catalyst

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Plasma Science and technology 2022年第5期24卷 48-56页

作者： Tao ZHU Xing ZHANG Zhenguo LI Xiaoning REN Baodong WANG Xuyang CHONG Hongli MA Institute of Atmospheric Environmental Management and Pollution control China University of Mining&Technology(Beijing)Beijing 100083People’s Republic of China State Key laboratory of Petroleum Pollution control CNPC Research Institute of Safety and Environmental TechnologyBeijing 102206People’s Republic of China national engineering laboratory for mobile source emission control technology China Automotive Technology&Research Center Co.LtdTianjin 300300People’s Republic of China national Institute of Clean-and-Low-Carbon Energy Beijing 102211People’s Republic of China

The presented work reports the selective catalytic reduction(SCR)of NO_(x) assisted by dielectric barrier discharge plasma via simulating marine diesel engine exhaust,and the experimental results demonstrate that the low-temperature activity of NH_(3)-SCR assisted by non-thermal plasma is enhanced significantly,particularly in the presence of a C_(3)H_(6) ***,CeMnZrO_(x)@TiO_(2) exhibits strong tolerance to SO_(2) poisoning and superior catalytic *** is worthwhile to explore a new approach to remove NO_(x) from marine diesel engine exhaust,which is of vital significance for both academic research and practical applications.

关键词： non-thermal plasma selective catalytic reduction marine diesel engine exhaust CeMnZrO_(x)@TiO_(2) NO_(x)conversion

Effect of catalyzed diesel particulate filter and its catalyst loading on emission characteristics of a non-road diesel engine

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Journal of Environmental Sciences 2023年第4期126卷 794-805页

作者： Yunhua Zhang Diming Lou Piqiang Tan Zhiyuan Hu Liang Fang School of Automotive studies Tongji UniversityShanghai 201804China

In this study, the effects of a diesel oxidation catalyst(DOC) coupled with a catalyzed diesel particulate filter(CDPF) with different catalyst loadings on the power, fuel consumption,gaseous and particulate emissions from a non-road diesel engine were investigated. Results showed that the after-treatment had a negligible effect on the power and fuel *** reduction effect of the DOC on the CO and hydrocarbon(HC) increased with the engine load. Further reductions occurred coupling with the CDPF. Increasing the catalyst loading resulted in a more significant reduction in the HC emissions than CO emissions. The DOC could increase the NO_(2)proportion to 37.9%, and more NO_(2)was produced when coupled with the CDPF below 250℃;above 250℃, more NO_(2)was consumed. The after-treatment could reduce more than 99% of the particle number(PN) and 98% of the particle mass(PM).Further reductions in the PN and PM occurred with a higher CDPF catalyst loading. The DOC had a better reduction effect on the nucleation particles than the accumulation ones, but the trend reversed with the CDPF. The DOC shifted the particle size distribution(PSD) to larger particles with an accumulation particle proportion increasing from 13% to 20%, and the geometric mean diameter(GMD) increased from 18.2 to 26.0 nm. The trend reversed with the CDPF and the accumulation particle proportion declined to less than 10%. A lower catalyst loading on the CDPF led to a higher proportion of nucleation particles and a smaller GMD.

关键词： Catalyzed diesel particulate filter Catalyst loading emissions Particle size distribution Geometric mean diameter