李永丹
固体催化剂与固体催化剂填充床的机械性质研究:化学工业中大多数催化过程采用固体催化剂和颗粒填充固定床反应器。
个性化签名
- 姓名:李永丹
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学术头衔:
博士生导师
- 职称:-
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学科领域:
催化化学
- 研究兴趣:固体催化剂与固体催化剂填充床的机械性质研究:化学工业中大多数催化过程采用固体催化剂和颗粒填充固定床反应器。
男,1962年3月29日生,1989年天津大学化工系获博士,1990-1992年先后在荷兰Twente大学、法国洛林理工学院做博士后。现任天津大学教授、博士生导师、任化工学院催化科学与工程系主任、工业催化学科负责人;兼任中国颗粒学会理事,中国化学会催化专业委员会委员;曾入选国家百千万人才计划,曾获国家杰出青年科学基金。他作为特邀主编编辑出版国际核心杂志Catalysis Today三个以中国同行为作者的专刊(分别出版于1996,1999,2002)。他负责的学科2001年在中国高校重点学科评选中被选为该专业惟一的国家级重点学科。主要研究领域及成果固体催化剂与固体催化剂填充床的机械性质研究:化学工业中大多数催化过程采用固体催化剂和颗粒填充固定床反应器。催化剂及其填充床的机械强度可靠性是其可靠运行的基础之一。李教授针对这一命题进行了系统的基础理论研究。提出了更具科学性的催化剂强度测试方法。提出了催化剂机械强度在生产和使用中的优化方案,取得较大社会效益。李教授作为第一作者获教育部2001年中国高校自然科学奖一等奖;和1998年天津市科技进步(自然科学)二等奖。纳米金属催化剂上甲烷裂解生长纳米碳和制氢:采用氢为燃料的燃料电池作为汽车驱动动力源,近年来已成为不可逆转的趋势,美国等已提出氢经济的概念。高效燃料电池对氢的纯度有很高要求,现有的水蒸汽重整路线由于生成一氧化碳从而使精制费用很高。甲烷裂解不生成一氧化碳,特别适合为质子交换膜燃料电池制氢。李教授在美国化学会杂志Energy & Fuels上关于甲烷裂解制氢工艺的论文被杂志主编选为体现杂志质量和影响的论文并被公布于网页(http://pubs.acs.org/journals/enfuem/ed_choice.html)。 其它研究活动:李教授与美国辛辛那提大学林跃生教授合作建立了无机膜反应器实验室,最近在无机膜制备和制氢工艺方面有较大进展。李教授的甲烷完全燃烧整体催化剂研究和柴油馏分加氢芳烃饱和催化剂研究也有较大进展。他为主研制的系列高效消毒剂已投入工业生产,获得2003年军队科技进步三等奖,还由于在抗击非典中的作用,李教授受到天津市政府和民进中央的表彰。
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李永丹
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-1年11月30日
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李永丹
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李永丹
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【期刊论文】Microstructure and growth of bamboo-shaped carbon nanotubes
李永丹, X.X. Zhang a, *, Z.Q. Li a, b, G.H. Wen a, K.K. Fung a, Jiuling Chen c, Yongdan Li c
Chemical Physics Letters 333(2001)509-514,-0001,():
-1年11月30日
Bamboo-shaped carbon nanotubes fabricated by the catalytic growth method with Ni/metallic oxide catalyst are systematically studied using transmission electron microscopy. It is found that except for the nodes the bamboo-shaped carbon nanotubes can be regarded as stacking of truncated conical graphene sheets. Depending on the size of a catalyst, the Ni particles can be encapsulated inside the tubes or at the growth front of the tubes with a plug-shape. A linear relationship between size of the nanotube and the catalyst particle is found. The results suggest that the nanometer-sized Ni catalyst particles are in the liquid state during nanotube growth. A simple model for the growth of bamboo-shaped nanotubes is proposed.
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李永丹, 蒋海洋①, 张宝泉①*, 林跃生①②*, 李永丹①
科学通报,2004,49(21):2133~2140,-0001,():
-1年11月30日
分子筛膜具有优良的反应和分离性能,可用于高温、高压等苛刻环境,在膜分离和膜反应等过程中的应用潜力巨大。迄今为止,已有多种分子筛膜的制备方法,包括聚合物嵌入法、原位水热晶化法和二次生长法等。与原位方法相比,二次生长法更容易操作,对晶体取向、微孔结构和膜厚等方面的控制优势明显,而且重复性也有大幅度提高。本文总结了分子筛膜的合成方法,特别着重于最具使用潜力的二次生长法,对目前存在的晶体取向、缺陷以及晶粒层数等热点问题进行了分析和论述,提出了分子筛膜制备过程中需要进一步解决的关键问题,有助于提高分子筛膜制备技术的水平。
分子筛膜 MFI型分子筛 二次生长法 膜合成
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李永丹, Yongdan Li, * Jiuling Chen, Yanmei Ma, Jinbao Zhao, Yongning Qin and Liu Chang
Chem. Commun., 1999, 1141-1142,-0001,():
-1年11月30日
Carbon nano-filament formation in hydrocarbon and syngas based catalytic processes is fatal for supported metal catalysts as this leads to deactivation and crushing, and hence limitation of carbon deposition has been a major topic in catalysis.1-5 Recently, the deliberate preparation of catalytically grown nanocarbons has been investigated because of their specific structure and potential for application in many fields.6-8 Many nanocarbon conformations have been reported, such as tubular, coiled, helical, branched, octopus, etc. and have been found to be sensitive to the reaction conditions and catalyst properties.9-14 Catalytic hydrocarbon decomposition9-13 or arc-discharge evaporation of graphite14-18 have been often used as preparation methods, though in the latter case, the presence of a metal is necessary as catalyst in the form of either vapor or droplets of melt. The selective preparation of a given formation is a challenge to catalysis researchers. Here, several nanocarbon conformations are shown to be formed with high morphological purity from methane on a coppernickel-alumina catalyst, and some interesting phenomena related to the nanosized metal are reported.
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【期刊论文】Eect of the mechanical failure of catalyst pellets on the pressure drop of a reactor
李永丹, Dongfang Wu, Lingyan Song, Baoquan Zhang, Yongdan Li∗
Chemical Engineering Science 58(2003)3995-4004,-0001,():
-1年11月30日
The effect of the mechanical failure of catalyst pellets on the pressure drop across a laboratory-scale catalyst packing has been examined by experiment. Results reveal that, along with the mechanical failure ofthe pellets, there exists a point ofmaximum curvature around which the slope of pressure drop increases rapidly. This rapid increase is attributed to a mutation of the packing structure, occurring as the amount off ailed pellets reaches a certain critical value. The secondary breakage ofthe pellets contributes much to the mutation of the packing and to the pressure drop. It has been observed that a trilobite catalyst is more susceptible to a mechanical stress than a cylindrical catalyst, and that a catalyst with a smaller diameter is much easier to result in an increase in the pressure drop. The measurement of the pressure drop across a laboratory-scale catalyst packing as the failure of pellets under a mechanical stress has a satisfactory reproducibility, and has a close meaning to the mechanical reliability of a: xed bed converter, and hence is recommended as a method for catalyst assessment. The multi-scale and multi-disciplinary nature ofcatalyst mechanical reliability is also discussed.
Solid catalyst packing, Mechanical failure, Bulk crushing strength, Pressure drop, Compaction of granular material, Multi-scale feature of catalyst packing
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李永丹, Dongfang Wu a, Yongdan Li a, *, Yahua Shi b, Zhiping Fang c, Dihua Wu c, Liu Chang a
Chemical Engineering Science 57(2002)3495-3504,-0001,():
-1年11月30日
Mathematical models for the e ects ofthe calcination process conditions on the mechanical properties ofa PCoMo/Al2O3 hydrotreating catalyst are developed using a response surface methodology. A central composite design is performed to study collectively the e ects ofcalcination temperature, calcination time and heating rate on the mean strength and Weibull's modulus. A model is obtained for each response with multiple regression analysis and then is re6ned. Analysis ofvariance reveals that the models developed are adequate. The validity ofthe models is also veri6ed by experimental data. Statistics reveals that there is a great potential for increasing the mechanical reliability in the calcination process. Analysis ofresponse surface show that the mean strength and Weibull's modulus increase with the increase ofcalcination temperature. The middle level ofheating rate results in smaller mean strength and higher Weibull's modulus. The mean strength increases as calcination time increases. However, calcination time has no signi6cant e ect on Weibull’s modulus in the experimental domain examined.
Mechanical properties, Response surface methodology, Modeling, Materials, Particle, Processes, Catalyst
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李永丹, Dongfang Wu a, Yongdan Li a, *, Jianpo Zhang a, Liu Changa, Dihua Wu b, Zhiping Fang b, Yahua Shi c
Chemical Engineering Science 56(2001)7035-7044,-0001,():
-1年11月30日
A Monte Carlo simulation is used to obtain the statistical properties of the Weibull parameters estimated by the linear regression, weighted linear regression and maximum likelihood schemes, respectively. Results reveal that the natural logarithm of the Weibull size parameter can be determined with about the same precision as the Weibull modulus. For Weibull modulus estimation, a maximum likelihood method results in the highest estimation precision; however, with a low safety factor. The weighted linear regression method with a weight factor Wi=F2i and a probability estimator Pf(Fi)=(i−0.3)=(n+0.4) or Pf(Fi)=(i−3/8)=(n+1/4), which leads to a similar estimation precision and a much higher safety factor, is considered to be the best method for engineering design. Simulations show that the weight factors and the probability estimators have e ects on the estimation precision. It is also concluded that the precision of any estimation method increases with the increase of the sample size. It is rea;rmed that 30-60 specimens are required to obtain a reasonable estimation precision of the Weibull parameters.
Estimation precision, Simulation, Materials, Dispersion, Safety, Mechanical strength measurement
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