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Methane oxybromination over Rh-based catalysts:Effect of supports

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1809-1815页

作者： Peng Wang Lang Chen Sheng Shen chak-tong au Shuangfeng Yin State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide EmissionsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China College of Chemistry and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China.

Bromine mediation has been regarded as one of the most efficient ways to activate and convert methane to useful *** article reports the effects of active components(Rh,Ru,Pd and Pt)and supports(SiO2,Mg O and Al2O3)on the catalysis of methane *** the prepared catalysts,Rh/SiO2 is the best in performance(CH4 conversion of ca.20%and CH3Br selectivity exceeding 70%).The results reveal that support type has a notable influence on the catalytic performance of Rh,especially on product *** high selectivity to CH3 Br over Rh/SiO2 is attributed to its low propensity for CH3Br *** was found that Rh small in particle size shows high catalytic activity and CH3Br *** silicalite-1 zeolite suffers from a certain degree of structural damage due to the presence of high temperature steam,the use of silicalite-1 as support results in a performance comparable to that of Rh/SiO2.

关键词： Methane conversion Oxybromination Methyl bromide Rhodium catalyst

Review on catalytic roles of rare earth elements in ammonia synthesis:Development and perspective

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Journal of Rare Earths 2022年第1期40卷 1-10页

作者： Lingling Li Tianhua Zhang Yanliang Zhou Xiuyun Wang chak-tong au Lilong Jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou 350002China

Ammonia(NH3)is mainly produced via the Haber-Bosch *** was discovered that the performance of a wide variety of catalysts in NH3 synthesis could be considerably enhanced by the addition of rare earth elements(REEs).As a result,catalysts promoted by REEs,especially the Ru-based ones have been extensively *** this review,we summarize the progress of utilizing REEs for ammonia synthesis and outline the prospects of using them in the design and development of highly efficient and stable catalysts for ammonia synthesis.

关键词： Ammonia synthesis catalyst Rare earth elements Thermal catalytic process Catalytic role Sustainable routes

Preparation and phase change performance of Na_2HPO_4·12H_2O@poly(lactic acid) capsules for thermal energy storage

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Chinese Journal of Chemical Engineering 2019年第3期27卷 695-700页

作者： Na Fan Lang Chen Guoyong Xie Donghong Yin chak-tong au Shuangfeng Yin State Key Laboratory of Chemo/Biosensing and Chemometrics Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions College of Chemistry and Chemical Engineering Hunan University Hunan Tobacco Industry Co. Ltd. College of Chemistry and Chemical Engineering Hunan Institute of Engineering

Micro-encapsulated phase-change materials(micro PCMs) with Na_2 HPO_4·12 H_2 O encapsulated in poly(lactic acid)(PLA) shell were prepared by a solvent evaporation–precipitation method that involves the use of a coaxial needle. The effects of PLA concentration, stirring speed, injection rate of core and shell solutions, and polyvinyl alcohol(PVA) concentration on phase change properties were investigated. The thermal properties of microP CMs were characterized by differential scanning calorimetry(DSC). The capsules prepared under the optimal conditions are about 2 mm in diameter and show a latent heat of up to 122.2 J·g^(-1).

关键词： Micro-encapsulated Phase-change materials Na2HPO4·12H2O Coaxial needle Poly(lactic acid) Thermal energy storage capsule

Cationic organobismuth complex as an effective catalyst for conversion of CO_(2) into cyclic carbonates

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 32-37页

作者： Xiaowen ZHANG Weili DAI Shuangfeng YIN Shenglian LUO chak-tong au College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China Department of Chemistry Hong Kong Baptist UniversityKowloon TongHong KongChina

In order to achieve high-efficiency conversion of CO_(2) into valuable chemicals,and to exploit new applications of organobismuth compounds,cationic organobismuth complex with 5,6,7,12-tetrahydrodibenz[c,f][1,5]azabismocine framework was examined for the first time for the coupling of CO_(2) into cyclic carbonates,using terminal epoxides as substrates and tetrabutylammonium halide as co-catalyst in a solvent-free environment under mild *** is shown that the catalyst exhibited high activity and selectivity for the coupling reaction of CO_(2) with a wide range of terminal *** selectivity of propylene carbonates could reach 100%,and the maximum turnover frequency was up to 10740 h^(-1) at 120℃ and 3 MPa CO_(2) pressure when tetrabutylammonium iodide was used as ***,the catalyst is environment friendly,resistant to air and water,and can be readily reused and recycled without any loss of activity,demonstrating a potential in industrial application.

关键词： cationic organobismuth complex terminal epoxide carbon dioxide coupling cyclic carbonate

Hydrothermal fabrication and visible-light-driven photocatalytic properties of bismuth vanadate with multiple morphologies and/or porous structures for Methyl Orange degradation

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Journal of Environmental Sciences 2012年第3期24卷 449-457页

作者： Haiyan Jiang Hongxing Dai Xue Meng Lei Zhang Jiguang Deng Yuxi Liu chak tong au Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical EngineeringCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Department of Chemistry Centre for Surface Analysis and ResearchHong Kong Baptist UniversityKowloon TongHong KongChina

Monoclinic BiVO4 with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniques. The photocatalytic activities of the BiVO4 materials were evaluated for the degradation of Methyl Orange under visible-light irradiation. It is observed that pH value and surfactant exerted a great effect on the morphology and pore structure of the BiVO4 product. Spherical BiVO4 with porous structures, flower-cluster-like BiVO4, and flower-bundle-like BiVO4 were generated hydrothermally at 100°C with poly（vinyl pyrrolidone）（PVP） and urea （pH = 2） and at 160°C with NaHCO3 （pH = 7 and 8）, respectively. The PVP-derived BiVO4 showed much higher surface areas （5.0-8.4 m2/g） and narrower bandgap energies （2.45-2.49 eV）. The best photocatalytic performance of the spherical BiVO4 material with a surface area of 8.4 m2/g was associated with its higher surface area, narrower bandgap energy, higher surface oxygen vacancy density, and unique porous architecture.

关键词： visible-light-driven catalyst porous bismuth vanadate hydrothermal fabrication Methyl Orange degradation photocatalysis

Core-shell structured Ru-Ni@SiO_2: Active for partial oxidation of methane with tunable H_2/CO ratio

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Journal of Energy Chemistry 2018年第3期27卷 883-889页

作者： Yixuan Dou Yijun Pang Lingli Gu Yifan Ding Wu Jiang Xinzhen Feng Weijie Ji chak-tong au Key Laboratory of Mesoscopic Chemistry MOE School of Chemistry and Chemical Engineering Nanjing University Department of Chemistry Hong Kong Baptist University

This study demonstrated that a Ru-Ni bimetallic core-shell catalyst（0.6%Ru-Ni）@Si O2with a proper surface Ru concentration is superior in achieving better catalytic activity and tunable H2/CO ratio at a comparatively lower reaction temperature（700℃）.Compared to the impregnation method,the hydrothermal approach leads to a highly uniform Ru distribution throughout the core *** Ru distribution would result in a proper surface Ru concentration as well as more direct Ru-Ni interaction,accounting for better catalyst *** surface Ru species hinders surface carbon deposition,but also declines overall activity and H2/CO ratio,meanwhile likely enhances Ni oxidation to certain degree under the applied reaction *** the current（m%Ru-Ni）@Si O2catalyst,the formation of fibrous carbon species is suppressed,which accounts for good stability of catalyst within a TOS of 10 h.

关键词： Ruthenium Nicolet Bimetallic Core-shell structure Partial oxidation of methane

Effects of cerium and tungsten addition on acid-base properties of spindle-likeα-Fe_(2)O_(3)in low-temperature SCR of NO_(x)with NH_(3)

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Journal of Rare Earths 2022年第11期40卷 1734-1742,I0003页

作者： Jun Ni Xuanbei Peng Linlin Yang Kai Zhang Yangyu Zhang Yanliang Zhou Xiuyun Wang chak-tong au Lilong Jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou 350002China

Low-temperature selective catalytic reduction(SCR)is important for the elimination of NOfrom stationary *** the present study,the loading of Ce and W onα-Fe_(2)O_(3)was achieved through the integration of single-mode microwave and incipient wetness impregnation(IWI)*** scanning electron microscopy(SEM)and transmission electron microscopy(TEM)images reveal that the structure ofα-Fe_(2)O_(3)is spindle-like,and the structure remains unchanged after the introduction of Ce and/or *** results of NH-SCR investigation demonstrate that NOconversion over Ce-W/α-Fe_(2)O_(3)is more than85%at 300℃,which is much higher than that over Ce/a-Fe_(2)O_(3)andα-Fe_(2)O_(3),Our studies illustrate that the addition of Ce can significantly increase the amount of surface oxygen vacancies as well as sites of moderate *** the other hand,the addition of W can obviously decrease the amount of basic sites and increase the number of Br?nsted acid *** synergistic effect of Ce and W addition on balancing acidity/basicity properties accounts for the high activity of CeW/α-Fe_(2)O_(3)for NOremoval at low *** study provides insight into the relationship between acidity/basicity properties and catalytic performance of Ce-W/α-Fe_(2)O_(3)catalysts,which is beneficial to the design of high-performance NH-SCR catalyst for NOremoval at low temperatures.

关键词： NH_(3)-SCR Fe_(2)O_(3) NO_(x)removal Acidity/basicity properties Morphology structure Rare earths

Target-oriented confinement of Ru-Co nanoparticles inside N-doped carbon spheres via a benzoic acid guided process for high-efficient low-temperature ammonia synthesis

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Journal of Energy Chemistry 2021年第6期30卷 140-146,I0005页

作者： Jun Ni Zhenni Tan Qianjin Sai Jie Zhu Xiuyun Wang Bingyu Lin Jianxin Lin chak-tong au Lilong Jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou 350002FujianChina

Ru-based heterogeneous catalysts have been used in a wide range of important ***,due to the sintering of Ru nanoparticles their practical applications are somewhat ***,for the first time we report a new and facile strategy to confine Ru and/or Co nanoparticles(NPs) in the channels of N-doped carbon using benzoic acid to guide the deposition location of *** developed catalyst with confined RuCo alloy particles exhibits high resistance against Ru sintering and displays excellent activity and long term stability for NH3 synthesis,achieving an NH3 synthesis rate of up to 18.9 mmol NH_(3) gcat^(-1)h^(-1)at 400℃,which is ca.2.25 times that of the catalyst prepared without confinement(with metal deposited on the support surface).In the latter case,there is an increase of nanoparticle size from 2.52 to 4.25 nm together with ca.48% decrease of NH_(3) synthesis rate after 68 h at 400℃.This study provides a new avenue for simple fabrication of precious-metal-based catalysts that are highly resistant against sintering,specifically suitable for low-temperature synthesis of ammonia with outstanding efficiency.

关键词： Ru-and Co-based catalysts Ammonia synthesis Confinement Sintering resistance Nanoparticle size

Porous FeO_x/BiVO_(4-δ)S_(0.08): Highly efcient photocatalysts for the degradation of Methylene Blue under visible-light illumination

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Journal of Environmental Sciences 2013年第10期25卷 2138-2149页

作者： Zhenxuan Zhao Hongxing Dai Jiguang Deng Yuxi Liu Yuan Wang Xinwei Li Guangmei Bai Baozu Gao chak tong au Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical Engineering College of Environmental and Energy Engineering Beijing University of Technology Department of Chemistry and Center for Surface Analysis and Research Hong Kong Baptist University

Porous S-doped bismuth vanadate with an olive-like morphology and its supported iron oxide （y wt.% FeOx/BiVO4-δS0.08, y = 0.06, 0.76, and 1.40） photocatalysts were fabricated using the dodecylamine-assisted alcohol-hydrothermal and incipient wetness impregnation methods, respectively. It is shown that the y wt.% FeOx/BiVO4-δS0.08 photocatalysts contained a monoclinic scheetlite BiVO4 phase with a porous olive-like morphology, a surface area of 8.8-9.2 m^2/g, and a bandgap energy of 2.38-2.42 eV. There was co-presence of surface Bi^5＋, Bi^3＋, V^5＋, V^3＋, Fe^3＋, and Fe^2＋ species in y wt.% FeOx/BiVO4-δS0.08. The 1.40 wt.% FeOx/BiVO4-δS0.08 sample performed the best for Methylene Blue degradation under visible-light illumination. The photocatalytic mechanism was also discussed. We believe that the sulfur and FeOx co-doping, higher oxygen adspecies concentration, and lower baudgap energy were responsible for the excellent visible-light-driven catalytic activity of 1.40 wt.% FeOx/BiVO4-δS0.08.

关键词： sulfur-doped bismuth vanadate supported iron oxide visible-light-driven photocatalyst porous morphology Methylene Blue degradation