在不同的准等温和变化的压力条件下,对LaNi4.7Al0.3贮氢合金的氢化/脱氢动力学进行了PCT模型的模拟研究.一个理想的合金氢化/脱氢反应动力学方程是设计反应过程单元的重要工具.根据多项式PCT方程与形核成长模型得到适合于LaNi4.7Al0.3贮氢合金氢化/脱氢动力学的模型方程.该合金PCT平台区斜率较大,将平台区按氢化/脱氢量划分为3个区域,利用Vant' Hoff方程计算出各区域反应焓变和熵变.模拟研究结果表明,该模型方程中活化能Ea=32kJ/mol,Avrami指数n的取值范围为1.1～1.33时,计算曲线与实验结果能较好地吻合,氢化/脱氢过程由反应初期的一维形核长大控制向后期的低维扩散控制转变.
参考文献
| [1] | Marshall H M;Dieter M G .LaNi5-xAlx is a versatile alloy system for metal hydride applications[J].Nature,1977,269(09):45-47. |
| [2] | 王玉琪,杨福胜,张早校,冯霄,郭权发.金属氢化物反应器的设计与过程模拟[J].西安交通大学学报,2006(07):831-835. |
| [3] | 林玉芳,郭佩佩,郭世海,张羊换,赵栋梁.La0.75Mg0.25Ni3.5Si0.10贮氢合金高温动力学性能的研究[J].功能材料,2011(12):2261-2264. |
| [4] | Simulation study on the reaction process based single stage metal hydride thermal compressor[J].International journal of hydrogen energy,2010(1):321. |
| [5] | Dhaoua H;Askri F;Ben Salaha M et al.Measurement and modelling of kinetics of hydrogen sorption by LaNi5 and two related pseudobinary compounds[J].International Journal of Hydrogen Energy,2007,32(05):576-587. |
| [6] | T. Forde;J.P. Maehlen;V.A. Yartys;M.V. Lototsky;H. Uchida .Influence of intrinsic hydrogenation/dehydrogenation kinetics on the dynamic behaviour of metal hydrides: A semi-empirical model and its verification[J].International journal of hydrogen energy,2007(8):1041-1049. |
| [7] | F.S. Yang;Z.X. Zhang;Z.W. Bao .An extensive parametric analysis on the performance of a single-stage metal hydride heat transformer[J].International journal of hydrogen energy,2012(3):2623-2634. |
| [8] | B. Joseph;B. Schiauo;G. D'Ali Staiti;B.R. Sekhar .An experimental investigation on the poor hydrogen sorption properties of nano-structured LaNi_5 prepared by ball-milling[J].International journal of hydrogen energy,2011(13):7914-7919. |
| [9] | Christian J W.The theory of transformatons in metals and alloys[M].Amsterdam:Pergamon,2002:529-546. |
| [10] | Milan Visaria;Issam Mudawar .Experimental investigation and theoretical modeling of dehydriding process in high-pressure metal hydride hydrogen storage systems[J].International journal of hydrogen energy,2012(7):5735-5749. |
| [11] | Hu Zilong.Hydrogen storage materials[M].北京:化学工业出版社,2002:91-110. |
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