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Low-temperature NH_(3) abatement via selective oxidation over a supported copper catalyst with high Cu^(+) abundance

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Journal of Environmental Sciences 2024年第9期143卷 12-22页

作者： Zhiming Yang Lin Peng Leneng Yang mingli fu Daiqi Ye Peirong Chen Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Guangdong Chengyi Environmental Technology Corp. Shaoguan 512158China

Selective catalytic NH_(3)-to-N_(2) oxidation(NH_(3)-SCO)is highly promising for abating NH_(3) emissions slipped from stationary flue gas after-treatment *** practical application,however,is limited by the non-availability of low-cost catalysts with high activity and N_(2) ***,using defect-rich nitrogen-doped carbon nanotubes(NCNT-AW)as the support,we developed a highly active and durable copper-based NH_(3)-SCO catalyst with a high abundance of cuprous(Cu^(+))*** obtained Cu/NCNT-AW catalyst demonstrated outstanding activity with a T_(50)(*** temperature to reach 50% NH_(3) conversion)of 174℃ in the NH_(3)-SCO reaction,which outperformed not only the Cu catalyst supported on N-free O-functionalized CNTs(OCNTs)or NCNT with less surface defects,but also those most active Cu catalysts in open *** kinetics measurements and temperature-programmed surface reactions using NH_(3)as a probe molecule revealed that the NH_(3)-SCO reaction on Cu/NCNT-AW follows an internal selective catalytic reaction(i-SCR)route involving nitric oxide(NO)as a key *** to mechanistic investigations by X-ray photoelectron spectroscopy,Raman spectroscopy,and X-ray absorption spectroscopy,the superior NH_(3)-SCO performance of Cu/NCNT-AW originated from a synergy of surface defects and ***,surface defects promoted the anchoring of Cu O nanoparticles on N-containing sites and,thereby,enabled efficient electron transfer from N to Cu O,increasing significantly the fraction of SCR-active Cu^(+)sites in the *** study puts forward a new idea for manipulating and utilizing the interplay of defects and N-dopants on carbon surfaces to fabricate Cu^(+)-rich Cu catalysts for efficient abatement of slip NH_(3)emissions via selective oxidation.

关键词： NH_(3)-SCO XANES Localized etching N-doping N_(2) selectivity i-SCR

Broadband impedance spectrum detection of buffer layer defects in 110 kV crosslinked polyethylene cable with corrugated aluminium sheath

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High Voltage 2023年第5期8卷 967-976页

作者： Yanpeng Hao Peng Zhao Baojun Hui Yanting Cheng Wenbo Zhu mingli fu Xiaodong Li School of Electric Power Engineering South China University of TechnologyGuangzhouChina China Southern Power Grid Electric Power Research Institute Co.Ltd GuangzhouChina

The buffer layer defects of high‐voltage crosslinked polyethylene(XLPE)cable occur frequently,which makes the detection method become the focus to be ***,the broadband impedance detection technology for the buffer layer defects of high‐voltage XLPE cables with corrugated aluminium sheath is *** are nine cable samples,including new and defective *** of the defective cables are artificial,and the other is retired *** influence of wiring mode,the circumferential relative position of electrodes,cable length,artificial white powder,artificial damp,and retired defective cables on the impedance spectrum is *** is found that the wiring mode of the insulation shield/aluminium sheath at the end of the cable can effectively detect the buffer layer *** the broadband impedance amplitude spectrum of the buffer layer in defective cable,measuring at various circumferential relative positions,is obviously *** there are white powders,air gaps,or ablation in the buffer layer,the broadband impedance spectrum(BIS)will increase by several *** the buffer layer is damped,the BIS will *** research here provides theoretical support and technical methods for the buffer layer defects of XLPE cable with corrugated aluminium sheath.

关键词： impedance spectrum layer

Adsorption of VOCs on reduced graphene oxide

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Journal of Environmental Sciences 2018年第5期30卷 171-178页

作者： Lian Yu Long Wang Weicheng Xu Limin Chen mingli fu Junliang Wu Daiqi Ye College of Environment and Energy South China University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Ouangzhou 510006China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment South China University of TechnologyGuangzhou 520006China

A modified Hummer＇s method was adopted for the synthesis of graphene oxide（GO） and reduced graphene oxide（rGO）. It was revealed that the modified method is effective for the production of GO and rGO from graphite. Transmission electron microscopy（TEM） images of GO and rGO showed a sheet-like morphology. Because of the presence of oxygenated functional groups on the carbon surface, the interlayer spacing of the prepared GO was higher than that of rGO. The presence of ／OH and CO groups in the Fourier transform infrared spectra（FTIR） spectrum and G-mode and 2D-mode in Raman spectra confirmed the synthesis of GO and rGO. rGO（292.6 m2/g） showed higher surface area than that of GO（236.4 m2/g）. The prepared rGO was used as an adsorbent for benzene and toluene（model pollutants of volatile organic compounds（VOCs）） under dynamic adsorption/desorption conditions. rGO showed higher adsorption capacity and breakthrough times than GO. The adsorption capacity of rGO for benzene and toluene was 276.4 and 304.4 mg/g, *** experiments showed that the spent rGO can be successfully regenerated by heating at 150.0℃. Its excellent adsorption/desorption performance for benzene and toluene makes rGO a potential adsorbent for VOC adsorption.

关键词： Graphene oxide Reduced graphene oxide Volatile organic compounds Adsorption

Research progress of semiconductive shielding layer of HVDC cable

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High Voltage 2020年第1期5卷 1-6页

作者： Yanhui Wei Wang Han Guochang Li Qingquan Lei mingli fu Chuncheng Hao Guanjun Zhang Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoPeople's Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anPeople's Republic of China China South Power Grid International Co. LtdGuangzhouPeople's Republic of China

As an indispensable part of high-voltage direct current(HVDC)cable,the semiconductive shielding layer plays the role of uniforming electric field in the ***,cable shielding materials>35 kV mainly rely on foreign imports in China,which belongs to the technical weak issues in the field of electrical *** present,there are few systematic reports on semiconductive shielding material of HVDC *** the work,the mechanisms of charge conduction and thermal conduction of semiconductive material have been *** of raw material,carbon black content and the second conductive filler on the resistance characteristics of the semiconductive layer,the charge accumulation characteristics of the insulating layer and the interface characteristics have been studied.A kind of semiconductive layer as a high voltage terminal charge emission method has been proposed to study charge emission from the semiconducting layer to the insulation *** work can provide theoretical guidance for the research of semiconductive shielding materials.

关键词： conductive layer conduction

Decay characters of charges on an insulator surface after different types of discharge

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Plasma Science and Technology 2017年第7期19卷 93-101页

作者： Cheng PAN Ju TANG Dibo WANG Yi LUO Ran ZHUO mingli fu School of Electrical Engineering Wuhan University Wuhan 430072 People＇s Republic of China State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology Chongqing University Chongqing 400044 People＇s Republic of China Electric Power Research Institute China Southern Power Grid Guangzhou 510080 People＇s Republic of China

In an insulating system including solid and gas dielectrics, discharge type has a strong impact on charge accumulation at the interface between two dielectrics, and hence charge decay. In order to clarify the influence, a surface charge measurement system was constructed, and three types of discharge, i.e. surface discharge, and low intensity and high intensity coronas, were introduced to cause surface charge accumulation. The decay behavior of surface charges after different types of discharge was obtained at various temperatures. It was found that total surface charges monotonically decreased with time, and the decay rate became larger as temperature increased. However, after a surface discharge or a high intensity corona, surface charge density in the local area appeared to fluctuate during the decay process. Compared with this, the fluctuation of surface charge density was not observed after a low intensity corona. The mechanisms of surface charge accumulation and decay were analysed. Moreover, a microscopic physical model involving charge production, accumulation, and decay was proposed so that the experimental results could be explained.

关键词： surface discharge corona surface charge accumulation surface charge decay,insulator

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

Experimental study on the partial discharge and AC breakdown properties of C_(4)F_(7)N/CO_(2)mixture

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High Voltage 2019年第1期4卷 12-17页

作者： Yi Li Xiaoxing Zhang Ji Zhang mingli fu Ran Zhuo Yi Luo Dachang Chen Song Xiao School of Electrical Engineering Wuhan UniversityWuhan 430072People's Republic of China Electric Power Research Institute China Southern Power GridGuangzhou 510623People's Republic of China

As an environmental friendly insulating medium,C_(4)F_(7)N has received extensive attention in the past two *** this study,the partial discharge(PD)and breakdown characteristics of C_(4)F_(7)N/CO_(2)gas mixture were investigated using the gas insulation performance test *** influence of gas pressure and mixing ratio on the PD initial voltage(PDIV)and breakdown voltage of C_(4)F_(7)N/CO_(2)gas mixture in different electric fields was *** was found that the PDIV and breakdown voltage of gas mixture with 2-8%C_(4)F_(7)N in the highly non-uniform field showed a linear saturation increasing trend with the change of gas pressure and mixing *** breakdown voltage of gas mixture increases linearly with gas pressure in the quasi-uniform electric *** relative breakdown voltage of gas mixture in the highly non-uniform field under high-pressure conditions is inferior to those of low-pressure *** C_(4)F_(7)N/CO_(2)gas mixture containing 2-8%C_(4)F_(7)N is sensitive to the non-uniformity of electric *** to the PD and breakdown tests results,C_(4)F_(7)N/CO_(2)gas mixture with 2-8%C_(4)F_(7)N has the potential to replace SF6 using in gas-insulated equipment.

关键词： field mixture mixing

Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO_(2) microsphere as a highly active catalyst for CO oxidation

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Chinese Chemical Letters 2021年第6期32卷 2057-2060页

作者： Shengpeng Mo Peng Peng Yinchang Pei Taiming Shen Qinglin Xie mingli fu Yunfa Chen Daiqi Ye College of Environment Science and Engineering Guilin University of TechnologyGuilin 541004China School of Environment and Energy South China University of TechnologyGuangzhou 510006China Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of TechnologyGuilin 541004China State Key Laboratory of Multi-Phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Herein,a facile glycol reduction route is successful employed to synthesize bimetallic Pt Ag alloys with homogeneous distribution of sizes and *** studies reveal that the ultrafine Pt Ag alloys with well-defined sizes from around 3.3 nm to 5.8 nm are immobilized onto MnO_(2)microsphere,which remarkably enhances the catalytic performances for CO ***,quasi in-situ X-ray photoelectron spectroscopy(XPS)result reveals that both Mn and Pt ions on the surface of catalysts would realize alternating reduction-oxidation by CO and O_(2)molecules,and the oxygen vacancy sites could be replenished and excited by gas-phase O_(2).

关键词： Bimetallic alloys PtAg NPs MnO_(2) Quasi in-situ XPS CO oxidation

Macroporous Ni foam-supported Co_3O_4 nanobrush and nanomace hybrid arrays for high-efficiency CO oxidation

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Journal of Environmental Sciences 2019年第1期31卷 136-144页

作者： Shengpeng Mo Hui He Quanming Ren Shuangde Li Weixia Zhang mingli fu Limin Chen Junliang Wu Yunfa Chen Daiqi Ye School of Environment and Energy South China University of Technology State Key Laboratory of Multi-phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT) Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal South China University of Technology Center for Excellence in Urban Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences

Herein, we reported the synthesis of well-defined Co_3O_4 nanoarrays(NAs) supported on a monolithic three-dimensional macroporous nickel(Ni) foam substrate for use in highefficiency CO oxidation. The monolithic Co_3O_4 NAs catalysts were obtained through a generic hydrothermal synthesis route with subsequent calcination. By controlling the reaction time,solvent polarity and deposition agent, these Co_3O_4 NAs catalysts exhibited various novel morphologies(single or hybrid arrays), whose physicochemical properties were further characterized by using several analytical techniques. Based on the catalytic and characterization analyses, it was found that the Co_3O_4 NAs-6 catalyst with nanobrush and nanomace arrays displayed enhanced catalytic activity for CO oxidation, achieving an efficient 100% CO oxidation conversion at a gas hourly space velocity(GHSV) 10,000 hr^(-1) and 150°C with longterm stability. Compared with the other Co_3O_4 NAs catalysts, it had the highest abundance of surface-adsorbed oxygen species, excellent low-temperature reducibility and was rich in surface-active sites(Co^(3+)/Co^(2+)= 1.26).

关键词： CO oxidation Nanomace Co3O4 Hybrid arrays Macroporous Ni foam