Development of Pt/ASDBC catalyst for room temperature recombiner of atmosphere detritiation system
Development of Pt/ASDBC catalyst for room temperature recombiner of atmosphere detritiation system
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DOI：
10.1016/j.fusengdes.2011.04.028
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发表时间：
2011-10-01
影响因子：
1.7
通讯作者：
Yamanishi, Toshihiko
中科院分区：
文献类型：
--
作者：
Iwai, Yasunori;Sato, Katsumi;Yamanishi, Toshihiko
在核聚变领域，已经应用了一种组合的催化反应堆和水吸收器系统，以控制释放到环境中的氚尽可能低。考虑到设施中的严重事故，强烈要求在室温下有效的氚氧化性能。我们已经开发了适用于氚氧化在饱和水蒸气在室温下存在的疏水铂催化剂。将铂负载于烷基-苯乙烯-二苯乙烯共聚物（ASDBC）上，制备了一种新型疏水催化剂Pt/ASDBC。在不存在/存在饱和水蒸气的情况下，在室温下使用3GBq/m3的氚进行催化剂的氚氧化测试。在室温范围内，Pt/ASDBC催化剂的总反应速率常数明显大于传统的Pt/Al（2）O（3）催化剂。在室温范围内，催化剂表面的氧化反应是反应的速率控制步骤。在室温范围内的总反应速率常数取决于空速和载体中氢的浓度。在干燥条件下，空速为5556 h（-1）时，室温范围内的总反应速率常数与k（总）= 1.60 × 10（5）exp（-33.0（kJ/mol）/R（g）/T）（s（-1））相关。(C)2011 Elsevier B.V.保留所有权利。
A combined catalytic reactor and water absorber system has been applied in the field of nuclear fusion to control the tritium release into the environment as low as reasonably achievable. Efficient tritium oxidation performance at room temperature has been strongly required taking a severe accident in a facility into consideration. We have developed hydrophobic Pt catalysts applicable for tritium oxidation in the presence of saturated water vapor at room temperature. A new type of hydrophobic catalyst, Pt/ASDBC, has been prepared by dipositting platinum on alkyl-styrene diviyl-benzene copolymer (ASDBC). Tritium oxidation tests of the catalysts using 3 GBq/m(3) of tritium were performed in the absence/presence of saturated water vapor at room temperature. The overall reaction rate constant for Pt/ASDBC catalyst in the ambient temperature range was considerably larger than that for the traditionally applied Pt/Al(2)O(3) catalyst. Oxidation reaction on the catalyst surface is the rate-controlling step in the ambient temperature range. The overall reaction rate constant in the ambient temperature range was dependent on the space velocity and hydrogen concentration in carrier. Values of the overall reaction rate constant in the ambient temperature range were correlated to k(overall) =1.60 x 10(5)exp(-33.0 (kJ/mol)/R(g)/T) (s(-1)) at the space velocity of 5556 h(-1) under the dry condition. (C) 2011 Elsevier B.V. All rights reserved.