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Pt–Pd bimetallic nanoparticles anchored on uniform mesoporous MnO_(2) sphere as an advanced nanocatalyst for highly efficient toluene oxidation

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Green Energy & Environment 2022年第6期7卷 1349-1360页

作者： Jiaqin He Dongyun Chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Improving catalytic performance is a yet still challenge in thermal catalytic ***,uniform mesoporous MnO_(2) nanospheresupported bimetallic Pt–Pd nanoparticles were successfully fabricated via a SiO_(2) template strategy for the total catalytic degradation of volatile organic compounds at low *** introduction of mesopores into the MnO_(2) support induces a large specific surface area and pore size,thus providing numerous accessible active sites and enhanced diffusion ***,the addition of a secondary noble metal can adjust the O_(ads)/O_(latt) molar ratios,resulting in high catalytic *** them,the catalyst having a Pt/Pd molar ratio of 7:3 exhibits optimized catalytic activity at a weight hourly space velocity of 36,000 mL g^(-1) h^(-1),reaching 100%toluene oxidation at 175℃ with a lower activation energy(57.0 kJ mol^(-1))than the corresponding monometallic Pt or non-Pt-based catalysts(93.8 kJ mol^(-1) and 214.2 kJ mol^(-1)).Our findings demonstrate that the uniform mesoporous MnO_(2) nanosphere-supported bimetallic Pt–Pd nanoparticles catalyst is an effective candidate for application in elimination of toluene.

关键词： MnO_(2)nanospheres Mesoporous structure Pt-Pd bimetal vocs oxidation

Catalytic performance improvement of volatile organic compounds oxidation over MnO_(x) and GdMnO_(3) composite oxides from spent lithium-ion batteries:Effect of acid treatment

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Chinese Journal of Chemical Engineering 2021年第6期34卷 278-288页

作者： Mingming Guo Lizhong Liu Jia-nan Gu Hongbo Zhang Xin Min Jianxing Liang Jinping Jia Kan Li Tonghua Sun School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Shanghai Institute of Pollution Control and Ecology Security Shanghai 200092China Shanghai Engineering Research Center of SolidWaste Treatment and Resource Recovery Shanghai 200240China

In this work,cathode materials of spent lithium-ion ternary batteries are recovered and used as metal precursor to prepare multi-metal oxides MnO_(x)(SY)and GdMnO_(3)(SY)via combustion method and sol-gel method,***,a series of MnO_(x)(SY)-n and GdMnO_(3)(SY)-n(n=0.05,0.10,1.00,4.00,n represents the dilute HNO_(3) concentration)catalysts are fabricated by acid treatment of MnO_(x)(SY)and GdMnO_(3)(SY)samples and catalytic activities of oxygenated vocs oxidation over all the prepared catalysts are *** evaluation results show that acid-treated MnO_(x)(SY)-0.10 and GdMnO_(3)(SY)-0.05 samples perform the optimum vocs removal efficiency respectively,which may be attributed to their obvious enhancement of physicochemical *** detail,Mn O_(x)(SY)-0.10 and GdMnO_(3)(SY)-0.05 samples exhibit the larger specific surface area,bigger amount of surface high-valence metal ions(Mn^(4+),Co^(3+),Ni^(3+)),more abundant adsorbed oxygen species and better low-temperature reducibility,which can play a crucial role in the significant improvement of vocs *** situ DRIFTS results imply that the possible main intermediates are-OCO,-COO and-C-O species produced during vocs *** by-products are further determined via TD/GC-MS analysis.

关键词： Spent lithium-ions batteries Acid treatment Multi manganese-based oxides and perovskite vocs oxidation

Unveiling the importance of reactant mass transfer in environmental catalysis:Taking catalytic chlorobenzene oxidation as an example

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Chinese Chemical Letters 2021年第3期32卷 1206-1209页

作者： Kexin Cao Xiaoxia Dai Zhongbiao Wu Xiaole Weng Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China

To date,investigations onto the regulation of reactants mass transfer has been paid much less attention in environmental ***,we demonstrated that by rationally designing the adsorption sites of multi-reactants,the pollutant destruction efficiency,product selectivity,reaction stability and secondary pollution have been all affected in the catalytic chlorobenzene oxidation(CBCO).Experimental results revealed that the co-adsorption of chlo robenzene(CB)and gaseous O_(2)at the oxygen vacancies of CeO_(2)led to remarkably high CO_(2)generation,owning to their short mass transfer distance on the catalyst surface,while their separated adsorptions at Bronsted HZSM-5 and CeO_(2)vacancies resulted in a much lower CO_(2)generation,and produced significant polychlorinated byproducts in the *** r,this separated adsorption model yielded superior long-term stability for the CeO_(2)/HZSM-5 catalyst,owning to the protection of CeO_(2)oxygen vacancies from Cl poisoning by the preferential adsorption of CB on the Bronsted acidic *** work unveils that design of environmental catalysts needs to consider both of the catalyst intrinsic property and reactant mass transfer;investigations of the latter could pave a new way for the development of highly efficient catalysts towards environmental pollution control.

关键词： vocs oxidation Chlorinated organics Reactant mass transfer Secondary pollution Catalyst design Environmental catalysis

Unveiling the secondary pollution in the catalytic elimination of chlorinated organics: The formation of dioxins

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Chinese Chemical Letters 2020年第6期31卷 1410-1414页

作者： Jiajia Liu Xiaoxia Dai Zhongbiao Wu Xiaole Weng Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang Universityand Zhejiang Provincial Engineering Research Center of Industrial Boiler&Furnace Flue Gas Pollution ControlHangzhou 310058China

Since the discovery of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)in the process of municipal solid waste incineration(MSWI),a large number of researches have been conducted to reveal their formation mechanisms and emission *** one of national priority control pollutants,chlorinated organics are inclined to transfer into PCDD/Fs in the heterogeneously catalyzed process,which has been considered to be one of great challenges in environmental ***,so far direct evidences to support such a conversion process are insufficient,and the reaction mechanisms are lack of *** study investigated the catalytic elimination of chlorobenzene(CBz)over a range of industrially applied active species including Pt,Ru,V,Ce and Mn oxides,and explored their reaction byproducts,chlorine adsorption/desorption behaviors and PCDD/F *** found that all of these species could generate the PCDD/Fs,amongst which,Mn species were the most active for PCDD/F *** 140 ng I-TEQg-1 PCDD/Fs were detected on the Mn-CNT surface after ageing at250℃for 30 *** using the dichloromethane(DCM)as a precursor,significant PCDD/Fs were still *** Ru and V species were shown to generate much less polychlorinated byproducts and PCDD/Fs,owning to their sufficiently high abilities in Cl desorption,which were through the semi-Deacon and Br(?)nsted H reactions,respectively.

关键词： vocs oxidation Chlorinated organics Secondary pollution Dioxin Electrophilic chlorination Environmental catalysis