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synergetic effects of NaAlH_4-TiF_3 co-additive on dehydriding reaction of Mg(AlH_4)_2

Journal of Energy Chemistry 2014年第6期23卷 726-731页

作者： Ying Wang Li Li Fangyuan Qiu Cuihua An Yijing Wang Lifang Jiao Huatang Yuan Institute of New Energy Material Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Key Laboratory of Advanced Energy Materials Chemistry (MOE) Nankai University

The effects of NaA1H4, TiF3 and NaA1H4-TiF3 co-additive on dehydriding reaction of Mg（A1H4）2 are systematically investigated. The on- set dehydrogenation temperature of the co-doped Mg（A1H4）2 composites decreased to 74 ℃, which is about 59 ℃ lower than that of pure Mg（A1H4）2. The dehydrogenation kinetics of NaA1H4-TiF3 co-doped Mg（A1H4）2 sample was also improved, which released about 94% hydrogen within 48 min, but no visible hydrogen was released from pure Mg（A1H4）2 under the same conditions. The activation energy of co-doped Mg（A1H4）2 was 85.6 ***-t, which was significantly lower than that of additive-free Mg（A1H4）2 sample. The synergetic effects of NaA1H4 and TiF3 on the dehydrogenation performance of Mg（A1H4）2 were confirmed. In addition, a possible catalytic mechanism is discussed, regarding the different roles of NaA1H4 and TiF3 on Mg（A1H4）2.

关键词： hydrogen storage Mg(A1H4)2 co-additive synergetic effects dehydrogenation properties

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A tunable ionic covalent organic framework platform for efficient CO_(2) catalytic conversion

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Frontiers of Chemical Science and Engineering 2024年第1期18卷 25-36页

作者： Ting Li Ji Xiong Minghui Chen Quan Shi Xiangyu Li Yu Jiang Yaqing Feng Bao Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Guangdong Laboratory of Chemistry and Fine Chemical Industry Jieyang Center Jieyang 522000China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

The cycloaddition reaction between epoxides and CO_(2) is an effective method to utilize CO_(2) *** organic frameworks(COFs)provide a promising platform for the catalytic CO_(2) transformations on account of their remarkable chemical and physical ***,a family of novel vinylene-linked ionic COFs named TE-COFs(TTE-COF,TME-COF,TPE-COF,TBE-COF)has been facilely synthesized from N-ethyl2,4,6-trimethylpyridinium bromide and a series of triphenyl aromatic aldehydes involving different numbers of nitrogen atoms in the central aromatic *** resulting catalyst TTE-COF with excellent adsorption capacity(45.6 cm3·g^(-1),273 K)exhibited outstanding catalytic performance,remarkable recyclability and great substrate ***,it was also observed that the introduction of nitrogen atom in the precursor led to a great improvement in the crystallinity and CO_(2) adsorption capacity of TE-COFs,thus resulting to a progressively improved catalytic *** work not only illustrated the influence of monomer nitrogen content on the crystallinity and CO_(2) adsorption capacity of TE-COFs but also provided a green heterogeneous candidate for catalyzing the cycloaddition between CO_(2) and epoxides,which shed a light on improving the catalytic performance of the CO_(2) cycloaddition reaction by designing the covalent organic frameworks structures.

关键词： CO_(2)cycloaddition nreaction covalent organic frameworks cyclic carbonate vinylene-linked synergetic effects

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Redox behaviors and structural characteristics of Mn_(0.1)Ce_(0.9)O_x and Mn_(0.1)Ce_(0.6)Zr_(0.3)O_x

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Journal of Rare Earths 2008年第4期26卷 523-527页

作者：贾莉伟沈美庆王军褚霞王家明胡志成 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Wuxi Weifu Environmental Catalysts Co. Ltd. Wuxi 214028 China

Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.30x samples synthesized by sol-gel method were tested for redox properties through the dynamic oxygen storage measurement and characterized using X-ray diffraction, BET, electron paramagnetic resonance, and X-ray photoelectron spectroscopy. The results showed that redox performances of ceria-based materials could be enhanced by synergetic effects between Mn-O and Ce-O. Fresh and aged samples were characterized with the fluorite-type cubic structure similar to CeO2, and furthermore, the thermal stability of Mn0.1Ce0.9Ox materials was improved by the introduction of some Zr atoms. From XPS, it could be concluded that Mn^2＋/Mn^3＋ redox couples existed on the surface of Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.3Ox samples. Electron paramagnetic resonance researches revealed that there were three types of Mn^2＋ species： isolated Mn^2＋ substituting for Ce^4＋ ions in the lattice with a cubic symmetry, ones in defect with a noncubic symmetry, and at the surface of samples.

关键词： three-way catalyst redox properties synergetic effects rare earths

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Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide

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Frontiers of Environmental Science & Engineering 2011年第1期5卷 57-64页

作者： Deming ZHAO Jie CHENG Michael R.HOFFMANN College of Chemical Engineering and Materials Science Zhejiang University of TechnologyHangzhou 310032China W.M.Keck Laboratories California Institute of TechnologyPasadenaCA 91125USA

Aqueous solutions of phenol were oxidized by hydrogen peroxide assisted by microwave(MW)irradiation.A simple kinetic model for the overall degradation of phenol in the presence of excess H_(2)O_(2) is proposed in which the degradation rate of phenol is expressed as a linear function of the concentrations of phenol and H_(2)O_(2).A detailed parametric study showed that the degradation rate of phenol increased with increasing[H_(2)O_(2)]until saturation was *** degradation followed apparent zero-order kinetics under MW radiation or H_(2)O_(2) ***,after 90 min of irradiation,the observed kinetics shifted to pseudo first *** overall reaction rates were significantly enhanced in the combined MW/H_(2)O_(2) system,mainly because microwave could accelerate H_(2)O_(2) to generate hydroxyl radical(·OH)and other reactive oxygen *** observed synergetic effects of the MW/H_(2)O_(2) process resulted in an increased in the net reaction rate by a factor of *** hydrogen peroxide is present in a large stoichiometric excess,the time required to achieve complete mineralization is reduced significantly.

关键词： microwave(MW)irradiation hydrogen peroxide phenol synergetic effects kinetic model

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The economic impact of emission peaking control policies and China's sustainable development

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Advances in Climate Change Research 2014年第4期5卷 162-168页

作者： WANG Yi ZOU Le-Le Institute of Policy and Management Chinese Academy of Sciences

To achieve the goals of national sustainable development, the peaking control of CO2 emissions is pivotal, as well as other pollutants. In this paper, we build a Chinese inter-regional CGE model and simulate 13 policies and their combinations. By analyzing the energy consumptions, coal consumptions, relating emissions and their impacts on GDP, we found that with the structure adjustment policy, the proportion of coal in primary fossil fuels in 2030 will decrease from 53% to 48% and CO2 emissions will decrease by 11.3%-22.8% compared to the baseline scenario. With the energy intensity reduction policy, CO2 emissions will decrease by 33.3% in 2030 and 47.8% in 2050 than baseline scenario. Other pollutants will also be controlled as synergetic effects. In this study we also find that although the earlier the peaking time the better for emission amounts control, the economic costs can not be ignored. The GDP will decrease by 2.96%-8.23% under different scenarios. Therefore, integrated policy solutions are needed for realizing the peaks package and more targeted measures are required to achieve the peaks of other pollutants earlier.

关键词： CO2 emission peak PM2.5 Policy scenario Economic impacts synergetic effects

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Possible Synergistic Toxicity of Oxygen Scavenger and Defoamer on the Niger Delta Freshwater <i>Tilapia guineensis</i>

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Journal of Environmental Protection 2021年第11期12卷 903-912页

作者： Ikechukwu Kingsley Anyanwu Ogbonna Friday Joel Owunari Abraham Georgewill World Bank Africa Centre of Excellence in Oilfield Chemical Research (ACE-CEFOR) University of Port Harcourt Rivers State Nigeria Department of Pharmacology Faculty of Basic Medical Science University of Port Harcourt Rivers State Nigeria

Globally, the generation of produced water keeps increasing due to depleting wells and about 40% of this wastewater is disposed of into the environment. Produced water is made up of several components that are toxic in nature, like production chemicals that are used for oil and gas production activities. Oxygen scavenger and defoamer are commonly used for corrosion prevention as both are applied at different stages of corrosion prevention. Evaluation of the possible synergistic toxicity contribution of oxygen scavenger and defoamer formed the basis of this research and was conducted using the Tilapia guineensis as bio-indicator. The toxicity test was carried out using the ELIMINOX (oxygen scavenger) and EC9017A (defoamer) individually and both chemicals were combined together. The choice of these chemicals was premised on previous researches that have confirmed that they are toxic individually, without further research on how they interact when they are combined. These chemicals and freshwater were used to generate produced water samples in the laboratory. The experiment was set up by adding ten fishes into each of the glass containers, containing the produced water samples at different concentrations and a control sample without the chemicals. The rate of mortality of the fish for the individual chemicals ranged from 100% to 10% for the different percentage concentrations. While on the other hand, a combination of the two chemicals had more survival than mortality, the percentage survival rate ranged from 100% to 90% across all the percentage concentrations. The lethal concentration also showed that the oxygen scavenger was more toxic than the defoamer, however, when they were combined;they showed an antagonistic relationship as the toxicity of the oxygen scavenger drastically reduced. The research findings intend to create awareness of the possible interaction of production chemicals when they are used for oil and gas activities and their combined toxicity

关键词： Produced Water Oxygen Scavenger Defoamer Tilapia guineensis Toxicity Lethal Concentration synergetic effects

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差异产品市场横向兼并单边效应评价方法评述

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产业经济 2011年第5期

作者：王继平于立

差异产品市场横向兼并单边效应分析技术在最近的十几年有了迅速发展。产业经济学家和反垄断执行机构日益发现，以市场界定和集中计算为基础的结构推定方法，在用于差异产品市场单边效应评价时存在着严重的不足和困难。相关市场界定是评... 详细信息

差异产品市场横向兼并单边效应分析技术在最近的十几年有了迅速发展。产业经济学家和反垄断执行机构日益发现，以市场界定和集中计算为基础的结构推定方法，在用于差异产品市场单边效应评价时存在着严重的不足和困难。相关市场界定是评价兼并反竞争效应的手段而不是目的。因而经济学家除了研究如何更好地界定市场外，还发展了无须界定相关市场、直接估计横向兼并单边反竞争效应的新方法。自然实验(简化式估计)和兼并模拟已经运用于兼并审查实践之中。Farrell & Shapiro最近提出的UPP检验虽然明显有偏离现行的美国兼并指南之嫌，但是可望在新指南中体现出来。考察横向兼并单边效应分析技术的演进脉络及其最新发展，对丰富和改进中国反垄断执行机构的兼并审查工具以及制定更好的横向兼并指南具有重要的参考价值。

关键词：单边效应协调效应协同效应兼并模拟 UPP检验 unilateral effects coordinated effects synergetic effects merger simulation UPP Test

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