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Chinese Chemical Letters 2022年第3期33卷 1279-1282页

作者： Xin Xu Ganggang Li Fenglian Zhang Guoxia Jiang zhengping hao Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China National Engineering Laboratory for VOCs Pollution Control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China

H_(2)S selective catalytic oxidation technology is a prospective way for the treatment of low concentration acid gas with simple process operation and low investment. However, undesirable results such as large formation of SO_(2) and catalyst deactivation inevitably occur, due to the temperature rise of fixed reaction bed caused by the exothermic reaction. Catalyst with high activity in wide operating temperature window, especially in high temperature range, is urgently needed. In this paper, a series of copper-substituted hexaaluminate catalysts (LaCu_(x), x = 0, 0.5, 1, 1.5, 2, 2.5) were prepared and investigated for the H_(2)S selective oxidation reaction at high temperature conditions (300-550℃). The LaCu_(1) catalyst exhibited excellent catalytic performance and great stability, which was attributed to the best reductive properties and proper pore structure. Besides, two facile deep processing paths were proposed to eliminate the remaining H_(2)S and SO_(2) in the tail gas.

关键词： Low concentration acid gas H_(2)S selective oxidation High temperature Hexaaluminate catalyst

Removal of cobalt(II) ion from aqueous solution by chitosan–montmorillonite

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Journal of Environmental Sciences 2014年第9期26卷 1879-1884页

作者： Hailin Wang haoqing Tang Zhaotie Liu Xin Zhang zhengping hao Zhongwen Liu Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Key Laboratory of Applied Surface and Colloid Chemistry Shanxi Normal University School of Chemistry & Chemical Engineering Shanxi Normal University

Montmorillonite （MMT） modified with chitosan （CTS, molecular weight = S x 104） was applied to remove heavy metal cations by using Co2＋ as a model ion. An increase in MMT interlayer distance observed from X-ray diffraction indicates the intercalation of CTS into MMT. Together with the results of scanning electron microscopy and Fourier transform infrared spectroscopy, it was concluded that the composite material of CTS and MMT （CTS-- MMT） was prepared successfully. The mass ratio of CTS to MMT had a strong influence on the adsorption performance of CTS-MMT. The highest adsorption value of 150 mg/g was obtained over the composite material with CTS to MMT mass ratio of 0.25, which is much higher than those reported in other studies. The adsorption isotherms and kinetic results indicated that Co2＋ was adsorbed over CTS-MMT in a multilayer model, and the chemical sorption of Co2＋ was determined to be the rate-limiting step.

关键词： Chitosan Montmorillonite Co2+Isotherm Kinetics

Physico-chemical characterization and source tracking of black carbon at a suburban site in Beijing

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Journal of Environmental Sciences 2015年第7期27卷 188-194页

作者： Hailin Wang Lei Nie Dan Liu Meiping Gao Minyan Wang zhengping hao National Urban Environmental Pollution Control Engineering Techniques Research Center Beijing Municipal Research Institute of Environmental Protection Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nan-jing University of Information Science and Technology Department of Chemical Engineering School of Chemical & Environmental Engineering China University of Mining & Technology Department of Environmental Nano-materials Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Particles from ambient air and combustion sources including vehicle emission, coal combustion and biomass burning were collected and chemically pretreated with the purpose of obtaining isolated BC（black carbon） samples. TEM（transmission electron microscopy）results indicate that BC from combustion sources shows various patterns, and airborne BC appears spherical and about 50 nm in diameter with a homogeneous surface and turbostratic structure. The BET（Barrett-Emmett-Teller） results suggest that the surface areas of these BC particles fall in the range of 3-23 m2/g, with a total pore volume of 0.03-0.05 cm3/g and a mean pore diameter of 7-53 nm. The nitrogen adsorption-desorption isotherms are indicative of the accumulation mode and uniform pore size. O2-TPO（temperature programmed oxidation）profiles suggest that the airborne BC oxidation could be classified as the oxidation of amorphous carbon, which falls in the range of 406-490℃ with peaks at 418, 423 and 475℃,respectively. Generally, the BC characteristics and source analysis suggest that airborne BC most likely comes from diesel vehicle emission at this site.

关键词： Black carbon Characterization Source emission Beijing

Catalytic oxidation of benzene over nanostructured porous Co_3O_4-CeO_2 composite catalysts

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Journal of Environmental Sciences 2011年第12期23卷 2078-2086页

作者： Chunyan Ma Zhen Mu Chi He Peng Li Jinjun Li zhengping hao Department of Environmental Nano-materials Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Mesostructured Co3O4-CeO2 composite was found to be an effective catalytic material for the complete oxidation of benzene. The Co3O4-CeO2 catalysts with different Co/Ce ratios （mol/mol） were prepared via the nanocasting method and the mesostructure was replicated from two-dimensional （2D） hexagonal SBA-15 and three-dimensional （3D） cubic KIT-6 silicas, respectively. All the obtained Co3O4-CeO2 catalysts exhibited the similar symmetry with the parent silicas and well ordered mesostructures. The Co3O4- CeO2 catalysts with 2D mesostructure showed lower catalytic activities than the corresponding 3D materials. The Co3O4-CeO2 catalyst nanocasted from KIT-6 and with the Co/Ce ratio of 16/1 possessed the best catalytic benzene oxidation activity due to larger quantities of surface hydroxyl groups and surface oxygenated species. The mesostructured Co3O4-CeO2 material thus shows great potential as a promising eco-environmental catalyst for benzene effective elimination.

关键词： benzene elimination nanocasting mesoporous Co3O4-CeO2 2D/3D structural Co/Ce ratios

Synergistic effects of Cu species and acidity of Cu-ZSM-5 on catalytic performance for selective catalytic oxidation of n-butylamine

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Journal of Environmental Sciences 2020年第10期32卷 55-63页

作者： Xin Xing Na Li Jie Cheng Yonggang Sun Zhongshen Zhang Xin Zhang zhengping hao Key Laboratory of Environmental Nanotechnology and Health Effects Research Center for Eco-Enuironmental SciencesChinese Academy of SciencesBeijing 100085China National Engineering Laboratory/or VOCs Pollution Control Material&Technology Research Center/or Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China

In this work, a series of Cu-ZSM-5 catalysts with different SiO2/Al2O3 ratios(25, 50, 100 and200) were synthesized and investigated in n-butylamine catalytic degradation. The n-butylamine can be completely catalytic degradation at 350 ℃ over all Cu-ZSM-5 catalysts. Moreover, Cu-ZSM-5(25) exhibited the highest selectivity to N2, exceeding 90% at 350 ℃. These samples were investigated in detail by several characterizations to illuminate the dependence of the catalytic performance on redox properties, Cu species, and acidity. The characterization results proved that the redox properties and chemisorption oxygen primarily affect n-butylamine conversion. N2 selectivity was impacted by the Bronsted acidity and the isolated Cu^2+ species. Meanwhile, the surface acid sites over Cu-ZSM-5 catalysts could influence the formation of Cu species. Furthermore, in situ diffuse reflectance infrared Fourier transform spectra was adopted to explore the reaction mechanism. The Cu-ZSM-5 catalysts are the most prospective catalysts for nitrogen-containing volatile organic compounds removal, and the results in this study could provide new insights into catalysts design for VOC catalytic oxidation.

关键词： CH3CH2CH2CH2NH2 Selective oxidation Cu-ZSM-5 Cu species Acid sites

Characterization of PM_(2.5)/PM_(2.5-10) and source tracking in the juncture belt between urban and rural areas of Beijing

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Chinese Science Bulletin 2009年第14期54卷 2506-2515页

作者： WANG HaiLin ZHOU YuMin ZHUANG YaHui WANG XiaoKe hao zhengping Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Coarse (PM2.5-10) and fine (PM2.5) atmospheric particulate samples were collected in summer and winter during 2005―2007 in the juncture belt between urban and rural areas of Beijing. Elements, ions, organic/elemental carbon (OC/EC) and polynuclear aromatic hydrocarbons (PAHs) were determined to obtain some latest information about the particulate pollution in the juncture belt of Beijing. Particulate matter levels at this site were high as compared with the levels at other sampling sites in Beijing. Pollution elements, secondary ions and PAHs were enriched in fine particles rather than in coarse particles. An obvious seasonal variation of the chemical composition of PM was observed. Source apportionment results showed that secondary components were the largest mass contributor of PM2.5, accounting for 28%; whereas soil-related sources were the largest contributor of PM2.5-10, explaining about 49% of the total mass. The abnormal levels of soil heavy metals at the electronic waste disassembly site in the upwind villages suggested the potential impact of such activities to the environment.

关键词：农村地区北京城市 PM2.5 大气颗粒物土壤重金属追踪表征

Long-term monitoring and source apportionment of PM_(2.5)/PM_(10) in Beijing,China

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Journal of Environmental Sciences 2008年第11期20卷 1323-1327页

作者： WANG Hailin ZHUANG Yahui WANG Ying SUN Yele YUAN Hui ZHUANG Guoshun hao zhengping Research Center for Eco-Environmental Sciences The Chinese Academy of Sciences Beijing 100085 China Center for Atmospheric Environmental Study Department of Chemistry Beijing Normal University Beijing 100875 China

During 2001-2006,PM2.5 (particle matter with aerodynamic diameter less than 2.5 microns) and PM10 (particle matter with aerodynamic diameter less than 10 microns) were collected at the Beijng Normal University (BNU) site,China,and in 2006,at a background site in Duolun (DL).The long-term monitoring data of elements,ions,and black carbon showed that the major constituents of PM2.5 were black carbon (BC) crustal elements,nitrates,ammonium salts,and *** five major components accounted for 20%-80% of...

关键词： PM2.5 PM10 monitoring source apportionment

Enhanced performances in catalytic oxidation of o-xylene over hierarchical macro-/mesoporous silica-supported palladium catalysts

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Frontiers of Environmental Science & Engineering 2016年第3期10卷 458-466页

作者： Nanli QIAO Xin ZHANG Chi HE Yang LI Zhongshen ZHANG Jie CHENG zhengping hao Department of Environmental Nano-materials and Technologies Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Department of Environmental Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A series of hierarchical macro-/mesoporous silica supports （MMSs） were successfully synthesized using dual-templating technique employing polystyrene （PS） spheres and the Pluronic P123 surfactant. Pd was next loaded on the hierarchical silica supports via colloids precipitation method. Physicochemical properties of the synthesized samples were characterized by various techniques and all catalysts were tested for the total oxidation of o-xylene. Among them, the Pd/MMS-b catalyst with tetraethoxysilane/polystyrene weight ratio of 1.0 exhibited superior catalytic activity, and under a higher gas hourly space velocity （GHSV） of 70000 h^-1, the 90% conversion of o-xylene has been obtained at around 200℃. The BET and SEM results indicated that Pd/MMS- b catalyst possesses high surface area and large pore volume, and well-ordered, interconnected macropores and 2D hexagonally mesopores hybrid network. This novel ordered hierarchical porous structure was highly beneficial to the dispersion of active sites Pd nanoparticles with less aggregation, and facilitates diffusion of reactants and products. Furthermore, the Pd/MMS-b catalyst possessed good stability and durability.

关键词： hierarchical macro-/mesoporous silica palladium VOCs catalytic oxidation

Promotional effect of Cu additive for the selective catalytic oxidation of n-butylamine over CeZrO_(x)catalyst

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Chinese Chemical Letters 2022年第6期33卷 3065-3072页

作者： Xin Xing Ting Zhao Jie Cheng Xiaoxiao Duan Wenpeng Li Ganggang Li Zhongshen Zhang zhengping hao National Engineering Laboratory for VOCs Pollution Control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China College of Environmental Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

The catalytic elimination of nitrogen-containing volatile organic compounds(NVOCs)still encounters bottlenecks in NO_(x)formation and low N_(2)***,a series of Cu-promoted Ce-Zr mixed oxide catalysts were synthesized using a simple precipitation approach,and n-butylamine was adopted as the probe pollutant to evaluate their catalytic *** Ce Cu_(10%)ZrO_(x)catalyst exhibited the best catalytic activity,with 100%n-butylamine conversion and 90%N_(2)selectivity at 250℃.Concurrently,this sample also displayed good water resistance.A detailed characterization of the catalyst was performed through a series of experimental studies and theoretical *** addition of Cu increased the redox property and promoted the production of oxygen vacancies,all of which were favorable for the greatest nbutylamine selective catalytic oxidation *** changes of oxygen vacancies over Ce Cu_(10%)ZrO_(x)in reaction process were studied by in situ Raman ***,in situ diffuse reflectance infrared Fourier transform spectra(DRIFTs)and theoretical calculations were employed to explore the reaction mechanism of n-butylamine selective *** high activity and selectivity of this catalyst confirm the practical feasibility of the selective oxidation of n-butylamine to CO_(2)and N_(2),and the exploration of the reaction mechanism provides new insights into the further design of catalysts.

关键词： N-Butylamine CeCu_(a)ZrO_(x)mixed oxide Selective oxidation Oxygen vacancies Reaction mechanism

Source apportionment for urban PM_(10) and PM_(2.5) in the Beijing area

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Chinese Science Bulletin 2007年第5期52卷 608-615页

作者： ZHANG Wei GUO JingHua SUN YeLe YUAN Hui ZHUANG GuoShun ZHUANG YaHui hao zhengping Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Center for Atmospheric Environmental Study Department of Chemistry Beijing Normal University Beijing 100875 China

Airborne particulate matter (PM2.5 and PM10) samples were collected at the Beijing Normal University sampling site in the urban area of Beijing, China in dry and wet seasons during 2001―2004. Concen-trations of 23 elements and 14 ions in particulate samples were determined by ICP-AES and IC, re-spectively. Source apportionment results derived from both Positive Matrix Factorization (PMF) and Chemical Mass Balance (CMB) models indicate that the major contributors of PM2.5 and PM10 in Beijing are: soil dust, fossil fuel combustion, vehicle exhausts, secondary particulate, biomass burning and some industrial sources. We have identified both regional common sources, such as vehicular emis-sions, particulate of secondary origin and biomass burning, as well as country-specific problems, such as sand storms and soil dust that should be addressed for effective air quality control.

关键词：北京地区城区空气颗粒物 PM10 PM2.5 污染源