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Regeneration of the deactivated TiO_2-ZrO_2-CeO_2 /ATS catalyst for NH_3-SCR of NO_x in glass furnace

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Journal of Rare Earths 2013年第2期31卷 130-136页

作者：杨波沈岳松沈树宝祝社民 College of Materials Science and Engineering Nanjing University of Technology Biotechnology and Pharmaceutical Engineering Nanjing University of Technology

Larger amounts of alkalis, alkali earth metals and sulfides in flue gas from glass furnace were easier to deactivate selective catalytic reduction （SCR） catalyst compared to the flue gases from other stationary sources. Catalyst regeneration has been an emerging research topic for flue gas denitrification in glass furnace. Regeneration of the deactivated TiO2-ZrO2-CeO2 /Al2TiO 5 -TiO2-SiO2 （ATS） complex phase ceramics catalysts used for NH3 -SCR of NO x in glass furnace was studied in this work. Effects of regeneration methods, including washing with different aqueous solutions and sulfuric acid, thermal regeneration, thermal reduction regeneration, and thermal regeneration with SO2 , on catalytic performance were comparatively investigated. In comparison of catalytic activities between the catalysts before and after regeneration, results showed that washing was the most effective regeneration method, and the sulfuric acid concentration of the washing solution was an important factor. Washing time directly affected catalyst regeneration efficiency and catalyst life. The regenerated TiO2-ZrO2 -CeO2 /ATS catalyst regained more than 90% NO conversion after being washed with 10 wt.% H2SO4 for 30 min.

关键词： deactivated TiO 2 -ZrO 2 -CeO 2 /ATS regeneration method catalytic performance glass furnace rare earths

Single-atom Sn-Zn pairs in CuO catalyst promote dimethyldichlorosilane synthesis

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National Science Review 2020年第3期7卷 600-608页

作者： Qi Shi Yongjun Ji Wenxin Chen Yongxia Zhu Jing Li Hezhi Liu Zhi Li Shubo Tian Ligen Wang Ziyi Zhong Limin Wang Jianmin Ma Yadong Li Fabing Su Gripm Advanced Materials Co. Ltd State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences Zhongke Langfang Institute of Process Engineering Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Department of Chemistry Tsinghua University College of Engineering Guangdong Technion–Israel Institute of Technology (GTIIT) Technion–Israel Institute of Technology (IIT) School of Physics and Electronics Hunan University Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical Technology

Single-atom catalysts are of great interest because they can maximize the atom-utilization efficiency and generate unique catalytic properties; however, much attention has been paid to single-site active components, rarely to catalyst promoters. Promoters can significantly affect the activity and selectivity of a catalyst, even at their low concentrations in catalysts. In this work, we designed and synthesized Cu O catalysts with atomically dispersed co-promoters of Sn and Zn. When used as the catalyst in the Rochow reaction for the synthesis of dimethyldichlorosilane, this catalyst exhibited much-enhanced activity,selectivity and stability compared with the conventional Cu O catalysts with promoters in the form of nanoparticles. Density functional theory calculations demonstrate that single-atomic Sn substitution in the Cu O surface can enrich surface Cu vacancies and promote dispersion of Zn to its atomic levels. Sn and Zn single sites as the co-promoters cooperatively generate electronic interaction with the Cu O support, which further facilitates the adsorption of the reactant molecules on the surface, thereby leading to the superior catalytic performance.

关键词： dual single-atom promoters CuO catalyst dimethyldichlorosilane synthesis Rochow reaction catalytic performance

Synthesis and catalytic property of urania-palladium-graphene nanohybrids

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Science China Materials 2017年第5期60卷 399-406页

作者：丁莉张则尧李彦 Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of Nanodevices State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

ABSTRACT Urania-paUadium-graphene nanohybrids were synthesized via a solvothermal process in ethylene glycol. With the solvothermal treatment, the Pd nanocrystals sur- rounded by well-crystallized urania supported on graphene oxide was obtained. This ternary hybrid showed consid- erably higher catalytic activity than palladium-graphene hybrids toward the reduction of 4-nitrophenol by NaBH4. Besides the smaller sizes of palladium nanoparticles in the ternary hybrids, in which the aggregation of Pd nanoparticles was prevented by urania, the charge transfer between the nano-structured Pd and urania may also contribute to the enhancement of catalytic activity by offering more active sites for adsorption and reaction.

关键词： uranium oxides palladium catalytic performance

Highly efficient and stable CuZr-based metallic glassy catalysts for azo dye degradation

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Journal of Materials Science & Technology 2020年第11期42卷 88-97页

作者： Bowen Zhao Zhengwang Zhu Xin Dong Qin Zhengkun Li Haifeng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Institute of Rare and Scattered Elements College of ChemistryLiaoning UniversityShenyang110036China

Metallic glasses with the unique disordered atomic structure and metastable nature have been recently applied to degrade the azo dyes and other organic pollutants based on their superior catalytic *** this work,the functional properties of six Cu Zr-based metallic glassy ribbons with the different nominal components in degrading Acid OrangeⅡ(AOⅡ)azo dyes were *** Cu47.5Zr46Al6.5 metallic glassy ribbons could exhibit the more advanced catalytic performance for degradation process,which could completely degrade azo dye aqueous solution within 30 ***,the Cu47.5Zr46Al6.5 metallic glassy ribbons also showed the excellent cyclic stability along with approximately 97.68%degradation efficiency after 10 *** excellent catalytic performance and stability are closely related to the synergistic effect of exposed copper nanoparticles and produced copper oxides in the reaction,which contributes to accelerate the generation of more hydroxyl radicals(·OH)to react with dye *** findings can be able to develop a novel potential metallic glassy material for the functional application of wastewater treatment.

关键词： Metallic glasses catalytic performance Degradation Azo dyes

Synthesis of biomorphic hierarchical CeO_2 microtube with enhanced catalytic activity

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Transactions of Nonferrous Metals Society of China 2017年第3期27卷 578-583页

作者： Jing-jing HUANG Chen-cheng WANG Lu-tian JIN Feng CHEN Zhi-gang CHEN School of Chemistry Biology and Materials EngineeringSuzhou University of Science and Technology Suzhou 215009 China Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and Technology Suzhou 215009 China

A biomorphic CeO2microtube with multiple-pore structure was fabricated by using the cotton as biotemplate,throughcerium nitrate solution infiltration and thermal *** emission scanning electron microscope(FESEM),powder X-raydiffraction(XRD),transmission electron microscope(TEM),N2adsorption?desorption isotherms,temperature-programmedreduction(TPR)and CO oxidation were used to characterize the *** results indicated that the synthesized products werecomposed of crystallites with grain size about9nm and exhibited a fibrous morphology similar to the original template andpossessed a specific surface area(BET)of62.3m2/*** with the conventional CeO2particles,the synthesized materialsshowed a superior catalytic activity for CO *** the synthesized fibrous CeO2,the CO conversion at320°C was above90%and a100%CO conversion was obtained at410°C.

关键词： synthesis biotemplate multiple-pore structure ceria catalytic performance

Self-supporting hierarchically micro/nano-porous Ni_(3)P-Co_(2)P-based film with high hydrophilicity for efficient hydrogen production

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Journal of Materials Science & Technology 2021年第6期65卷 118-125页

作者： Xiangtao Yu Xiangyu Ren Yanwei Zhang Zhangfu Yuan Zhuyin Sui Mingyong Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Chemistry&Chemical Engineering Yantai UniversityYantai 264005China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Designing efficient and stable non-precious metal HER(hydrogen evolution reaction)electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water ***,a facile strategy was developed to construct a multi-phase Ni3 P-Co_(2)P-(Ni-Co)film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous Ni Co P film,oxygen-free annealing for phase separation producing Ni_(3)P-Ni-Co_(2)P-Co structure,and acid etching for constructing surface nano-porous *** effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure,which not only enlarged the surface roughness,but enhanced the bubble detachment by improving the ***,the HER electrolysis durability was improved benefiting from the Ni_(3)P-Co_(2)P phases with high corrosion resistance(especially in acid solution)and the self-supporting film structure without ***,the Ni Co P-OA-AE film exhibited high HER catalytic performance,which delivered a current density of 10 m A cm^(-2)at a low overpotential of 42.9 and 39.7 m V in 1 M KOH and 0.5 M H_(2)SO_(4),*** also possessed high long-term electrolysis durability,and the cell voltage of water electrolysis using self-supporting porous Ni Co P-OA-AE||Ir O_(2)-Ta_(2)O_(5) electrolyzer at 500 m A cm^(-2)for 250 h in 0.5 M H_(2)SO_(4 )is only 2.9 V.

关键词： Self-supporting Micro/nano-porous film High hydrophilicity Bubble detachment High HER(hydrogen evolution reaction) catalytic performance

Rare earths (Ce, Y, Pr) modified Pd/La2O3-ZrO2-Al2O3 catalysts usedin lean-burn natural gas fueled vehicles

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Journal of Rare Earths 2017年第11期35卷 1077-1082页

作者： Haoxin Liu Baiwen Zhao Yusheng Chen Chengdun Ren Yaoqiang Chen Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 PR China

14%REO-2.5%LaO-33.5%ZrO-50%AlO(RE = Ce, Y, Pr) composites were prepared by a coprecipitation method. The Pd catalysts were obtained by an aqueous solution of Pd(NO)loaded on the rare earths modified composites with an initial wet impregnated method. The experiment results show that catalytic activity of the rare earths modified Pd/LaO-ZrO-AlOcatalysts is better than bare sample for methane oxidation. The structural characterization results reveal that the rare earths modified Pd catalysts increase amounts of surface active oxygen species by X-ray photoelectron spectroscopy(XPS) analysis and improve the dispersion of active component from H2-temperature programmed reduction(H2-TPR) measurement compared with bare sample. Especially,Pd/14%YO-2.5%LaO-33.5%ZrO-50%AlOsample exhibits highly active stability, it is related to the Pd particles highly dispersion,which was observed by transmission electron microscope(TEM) images.

关键词： Rare earths modified catalytic performance Natural gas fueled vehicles

Preparation of porous polyamide 6(PA6)membrane with copper oxide(CuO)nanoparticles selectively localized at the wall of the pores via reactive extrusion

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Nano Materials Science 2022年第2期4卷 169-177页

作者： Tianqi Liang Jie Liu Zhaoyang Wei Dean Shi Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsSchool of Materials Science and EngineeringHubei UniversityWuhan430062PR China

In this study,CuO nanoparticles are pre-modified with styrene-maleic anhydride copolymers(SMAs)of different molecular weights and MAH *** the pre-modified CuO nanoparticles(CuO-SMAs)are added to the PA6/SEBS(Styrene Ethylene Butylene Styrene copolymer)(40/60 wt/wt)polymer blends with a co-continuous *** SMA3(MAH=8 wt%,M_(n)=250000 g/mol)is used to modify CuO nanoparticles,and the grafting degree of SMA3 on the surface of CuO reaches 2.74 wt%,90.71%of the added mCuO-SMA3 nanoparticles can be located at the interface of PA6 and SEBS.A porous PA6 membrane with CuO nanoparticles located at the pore walls can be obtained after the SEBS phase is etched with *** catalytic reaction velocity constant(k)for the reduction of p-nitrophenol in NaBH_(4)solutions with the PA6/mCuO-SMA3 porous membrane can reach 1.0040 min^(-1).This work provides a feasible and straightforward method for the preparation of porous polymer membranes with functional nanoparticles located at the wall of the pores.

关键词： Co-continuous CuO nanoparticles Selective distribution Porous PA6 membrane catalytic performance

performance and characterization of iron-nickel catalysts for light olefin production

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Journal of Natural Gas Chemistry 2010年第4期19卷 422-430页

作者： Mostafa Feyzi Ali Akbar Mirzaei Department of Chemistry Faculty of SciencesUniversity of Sistan & Baluchestan

A series of x （Fe,Ni）/Al2O3 catalysts （x = 2-12 wt%） were prepared using incipient wetness method and studied for the conversion of synthesis gas to light olefins.6 wt%（Fe,Ni）/Al2O3 catalyst was found to be the optimal catalyst for the production of C2-C4 *** effects of calcination behaviors and operational conditions on the catalytic performance of the optimal catalyst were *** best operational conditions were molar feed ratio H2/CO = 2/1,T = 260 ℃,gas hourly space velocity （GHSV） = 2600 h^-1 and the pressure of 3 ***-izations of both precursors and catalysts were carried out using X-ray diffraction （XRD）,temperature-programmed reduction （TPR）,scanning electron microscopy （SEM）,N2-adsorption-desorption measurement,thermal gravimetric analysis （TGA） and differential scanning calorimetry （DSC）.

关键词： calcination behaviors operational conditions catalytic performance characterization