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Effect of rare earth on the performance of Ru/MgAl-LDO catalysts for ammonia synthesis

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Journal of Rare Earths 2018年第2期36卷 135-141页

作者： Jun Ni Baoqiang Jing Jianxin Lin Bingyu Lin Ziqi Zhao lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst School of Chemical Engineering Fuzhou University

A series of MgAl-layered double oxides（LDO） doped with different rare-earth elements（Y, La, and Ce）were synthesized by the calcination of Mg-Al layered double hydroxides, and Ru, which were used to prepare ammonia synthesis catalysts. The as-obtained oxides and catalysts were characterized by XRD,TEM, TPD, TPR and XPS to understand their catalytic performances in ammonia synthesis. The H_2-TPR and HRTEM studies reveal that Ru/Y-LDO catalyst possesses more active Ru metal and small particle *** XPS demonstrates that the electronic interaction between Y and Ru metals is stronger, which can be tentatively explained by most of Y inserted into the hydrotalcites structure. CO_2-TPD demonstrates that Ru/Y-LDO catalyst shows stronger basic site densities than catalysts doped with Ce and La. Higher activity of the Ru/Y-LDO catalyst can be attributed to smaller particle size, more active metal（Ru） and strong Ru-support interaction.

关键词： Ru Ammonia synthesis Layered double oxide(LDO) Rare earth elements

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

Effect of barium and potassium promoter on Co/CeO_2 catalysts in ammonia synthesis

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Journal of Rare Earths 2018年第7期36卷 703-707页

作者： Bingyu Lin Yi Liu Lan Heng Jun Ni Jianxin Lin lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University

The Co/CeO2 catalysts promoted with Ba or K were prepared to study the effect of promoter on the catalytic performance of ammonia synthesis. The results show that the presence of Ba or K promoter changes the properties of CeO2-supported Co catalysts including the surface area, the crystallite size and the morphology of CeO2, the reduction degree of cobalt species and the adsorption performance of hydrogen and nitrogen. As a consequence, the samples promoted with an appropriate amount of Ba show higher ammonia synthesis rates, while the catalysts with high Ba loading or K promoter all exhibit low catalytic activities.

关键词： Promoter Co/CeO2 catalyst Ammonia synthesis Barium Potassium Rare earths

Facile Synthesis and High-Value Utilization of Ammonia

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Chinese Journal of Chemistry 2022年第8期40卷 953-964页

作者： Yu Luo Shijing Liang Xiuyun Wang Bingyu Lin Chongqi Chen lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhouFujian 350002China Qingyuan Innovation Laboratory QuanzhouFujian 362801China

Ammonia is a key component in fertilizer and the carbon-free hydrogen *** ammonia synthesis and utilization have played a central role in the development of chemical *** industrial production of ammonia remains dependent on the energy-and carbon-intensive Haber-Bosch process.A major effort has been devoted to developing robust and efficient catalysts,as well as alternative benign ***,we detail our endeavors that develop the ammonia synthesis and decomposition catalysts,and utilize the ammonia *** firstly discuss the catalysts for ammonia synthesis via dissociative and associative process,and the regulation of catalysts'***,we review the burgeoning electrocata-lytic nitrogen reduction process,focusing on the enhanced catalytic performances by the regulation of the catalysts and the ***,we provide a novel high-value utilization of ammonia to achieve the"zero-carbon"circular *** promising catalysts,reactors,and ammonia energy systems have been discussed in *** end this Account that offers future research directions and prospects of ammonia.

关键词： Nitrogen fixation Ammonia-to-hydrogen Carbon-free Heterogeneous catalysis Supported catalysts

Ionic liquid-trimetallic electrocatalytic system for C–O bond cleavage in lignin model compounds and lignin under ambient conditions

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Nano Research 2024年第4期17卷 2420-2428页

作者： Guangyong Liu Yumiao Lu JunFeng Lu Yanlei Wang Shijing Liang Hongyan He lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou 350002China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Longzihu New Energy Laboratory Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450000China

Electrocatalytic depolymerization of lignin into value-added chemicals offers a promising technique to make biorefining ***,we report a robust trimetallic PdNiBi electrocatalyst for reductive C–O bond cleavage of different lignin model dimers and oxidized lignin under mild *** reduction reaction proceeds with complete substrate conversion and excellent yields toward monomers of phenols(80%–99%)and acetophenones(75%–96%)in the presence of an ionic liquid electrolyte with operational *** experimental investigations together with density functional theory(DFT)calculations reveal that the outstanding performance of the catalyst results from the synergistic effect of the metal elements,which facilitates the easier formation of a key Cαradical intermediate and the facile desorption of the as-formed products at the *** results open up new opportunities for lignin valorization through the green electrocatalytic approach.

关键词： electrocatalytic depolymerization lignin Ionic liquids density functional theory(DFT)calculation

Efficient and reversible separation of NH_(3) by deep eutectic solvents with multiple active sites and low viscosities

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Chinese Journal of Chemical Engineering 2024年第3期67卷 97-105页

作者： Jiayin Zhang Lu Zheng Siqi Fang Hongwei Zhang Zhenping Cai Kuan Huang lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst(NERC-CFC) College of Chemical EngineeringFuzhou UniversityFuzhou 350002China Qingyuan Innovation Laboratory Quanzhou 362801China

The efficient separation and collection of ammonia(NH_(3))during NH_(3) synthesis process is essential to improve the economic efficiency and protect the *** this work,ethanolammonium hydrochloride(EtOHACl)and phenol(PhOH)were used to prepare a novel class of deep eutectic solvents(DESs)with multiple active sites and low *** NH_(3) separation performance of EtOHACl+PhOH DESs was analyzed *** is figured out that the NH_(3) absorption rates in EtOHACl+PhOH DESs are very *** NH_(3) absorption capacities are very high and reach up to 5.52 and 10.74 mol·kg1 at 11.2 and 100.4 kPa under 298.2 K,*** addition,the EtOHACl+PhOH DESs present highly selective absorption of NH_(3) over N_(2) and H_(2) and good regenerative properties after seven cycles of absorption/*** intrinsic separation mechanism of NH_(3) by EtOHACl+PhOH DESs was further revealed by spectroscopic analysis and quantum chemistry calculations.

关键词： Separation Absorption Ionic liquid Deep eutectic solvent Multiple active site Low viscosity

Efficient low-temperature soot combustion by bimetallic Ag–Cu/SBA-15 catalysts

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Journal of Environmental Sciences 2018年第2期30卷 122-129页

作者： Zhaojun Wen Xinping Duan Menglin Hu Yanning Cao Linmin Ye lilong jiang Youzhu Yuan State Key Laboratory of Physical Chemistry of Solid Surfaces National Engineering Laboratory for Green Chemical Productions of Alcohols-EthersEsters College of Chemistry and Chemical Engineering Xiamen University National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University

In this study, the effects of copper（Cu） additive on the catalytic performance of Ag/SBA-15 in complete soot combustion were investigated. The soot combustion performance of bimetallic Ag–Cu/SBA-15 catalysts was higher than that of monometallic Ag and Cu catalysts. The optimum catalytic performance was acquired with the 5 Ag1-Cu0.1/SBA-15 catalyst, on which the soot combustion starts at Tig= 225°C with a T50= 285°C. The temperature for 50% of soot combustion was lower than that of conventional Ag-based catalysts to more than 50°C（Aneggi et al., 2009）. Physicochemical characterizations of the catalysts indicated that addition of Cu into Ag could form smaller bimetallic Ag–Cu nanolloy particles, downsizing the mean particle size from 3.7 nm in monometallic catalyst to 2.6 nm in bimetallic Ag–Cu catalyst. Further experiments revealed that Ag and Cu species elicited synergistic effects, subsequently increasing the content of surface active oxygen species. As a result, the structure modifications of Ag by the addition of Cu strongly intensified the catalytic performance.

关键词： Silver Copper Bimetallic catalyst Nanoalloy Soot combustion Thermal stability

Enhancing the activity of MoS_(2)/SiO_(2)-Al_(2)O_(3) bifunctional catalysts for suspended-bed hydrocracking of heavy oils by doping with Zr atoms

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Chinese Journal of Chemical Engineering 2021年第11期34卷 126-134页

作者： Yongde Ma Rengan Liang Wenquan Wu Jiayin Zhang Yanning Cao Kuan Huang lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst(NERC-CFC) Fuzhou UniversityFuzhou 350002China

Developing catalysts with not only hydrogenation activity but also cracking activity is very important for the advancement of suspended-bed hydrocracking *** this respect,MoS_(2)/SiO_(2)-Al_(2)O_(3)bifunctional catalyst is a kind of typical catalysts with both hydrogenation and cracking ***,a series of Zr-doped SiO_(2)-Al_(2)O_(3)mixed oxides were synthesized by a sol-gel coupled with hydrothermal *** synthesized mixed oxides were characterized for chemical structures and acidic *** is found that doping SiO_(2)-Al_(2)O_(3)with Zr atoms significantly increases the numbers of acidic *** Zr-doped SiO_(2)-Al_(2)O_(3)mixed oxides were then combined with dispersed MoS_(2),which was in-situ produced from oil-soluble Mo precursors,to fabricate a novel kind of bifunctional catalysts for suspended-bed hydrocracking of heavy *** to the significantly increased numbers of acidic sites in Zr-doped SiO_(2)-Al_(2)O_(3)mixed oxides,corresponding bifunctional catalysts demonstrate much enhanced activity for suspended-bed hydrocracking of heavy oils in relative to MoS_(2)/SiO_(2)-Al_(2)O_(3)bifunctional catalysts.

关键词： Petroleum Hydrogenation Catalyst Suspended bed Cracking Mixed oxide

Pyrochlore La_(2)Zr_(2-x)Ni_(x)O_(7)anodes for direct ammonia solid oxide fuel cells

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Frontiers in Energy 2024年第5期18卷 699-711页

作者： Shiqing Yang Yijie Gao Xinmin Wang Fulan Zhong Huihuang Fang Yu Luo lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst(NERC-CFC) College of Chemical EngineeringFuzhou UniversityFuzhou 350002China

Developing efficient anode catalysts for direct ammonia solid oxide fuel cells(NH_(3)-SOFCs)under intermediate-temperatures is of great importance,in support of hydrogen economy via ammonia *** the present work,the pyrochlore-type La_(2)Zr_(2-x)Ni_(x)O_(7+δ)(LZN_(x),x=0,0.02,0.05,0.08,0.10)oxides were synthesized as potential anode catalysts of NH_(3)-SOFCs due to the abundant Frankel defect that contributes to the good conductivity and oxygen ion mobility *** effects of different content of Ni^(2+)doping on the crystal structure,surface morphology,thermal matching with YSZ(Yttria-stabilized zirconia),conductivity,and electrochemical performance of pyrochlore oxides were examined using different characterization *** findings indicate that the LZN_(x)oxide behaves as an n-type semiconductor and exhibits an excellent high-temperature chemical compatibility and thermal matching with the YSZ ***,LZN_(0.05)exhibits the smallest conductive band potential and bandgap,making it have a higher power density as anode material for NH_(3)-SOFCs compared to other *** a result,the maximum power density of the LZN_(0.05)-40YSZ composite anode reaches 100.86 mW/cm^(2)at 800℃,which is 1.8 times greater than that of NiO-based NH_(3)-SOFCs(56.75 mW/cm^(2))under identical flow rate and temperature *** extended durability indicates that the NH_(3)-SOFCs utilizing the LZN_(0.05)-40YSZ composite anode exhibits a negligible voltage degradation following uninterrupted operation at 800℃for 100 h.

关键词： anode catalyst ammonia oxidation Ni particles NH_(3)-SOFCs