A review of catalytic sulfur (VI) oxide decomposition experiments
A review of catalytic sulfur (VI) oxide decomposition experiments
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DOI：
10.1016/j.ijhydene.2011.10.054
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发表时间：
2012-02
影响因子：
7.2
通讯作者：
N. Brown;S. Revankar
中科院分区：
文献类型：
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作者：
N. Brown;S. Revankar
氧化硫 (VI)，也称为三氧化硫或 SO3，分解是一种产氧分解反应，在高于 500 K 的温度下在气态系统 SO3/SO2/O2/H2O 中进行。SO3 到 SO2 和 O2 的最大分解产率最好在超过 1000 K 的温度下使用适当的催化剂才能实现。根据文献，贵金属和一些过渡金属氧化物在实验室环境中是高效的催化剂。硫 (VI) 氧化物分解是多种吸热制氢化学工艺热电厂的能量和温度限制步骤。特别是，通用原子公司的硫碘循环和西屋混合硫循环是高温核反应堆热耦合的候选方案。因此，硫（VI）氧化物分解反应是高温核反应堆的潜在热沉。因此，为了运行效率和安全性，需要优化催化剂选择。本文综述了硫（VI）氧化物分解的反应机理和催化剂组成。之前的硫 (VI) 氧化物分解实验的化学动力学数据是从档案期刊论文或其他公开文献中提取的。现有的实验数据库表明，Pt基催化剂在贵金属中具有最高的稳定活性，而Fe2O3基催化剂在过渡金属氧化物中具有最高的稳定活性。相应金属硫酸盐的分解温度决定了给定过渡金属氧化物的催化活性。
Sulfur (VI) oxide, also known as sulfur trioxide or SO3, decomposition is an oxygen-generating decomposition reaction that proceeds in the gaseous system SO3/SO2/O2/H2O at temperatures above 500 K. Maximum decomposition yield of SO3to SO2and O2is best achieved at temperatures of over 1000 K with an appropriate catalyst. According to the literature, noble metals and some transition metal oxides are highly effective catalysts in the laboratory environment. Sulfur (VI) oxide decomposition is the energetic and temperature limiting step of several endothermic hydrogen generating chemical process heat plants. In particular, the General Atomics Sulfur Iodine cycle and the Westinghouse Hybrid Sulfur cycle are candidates for thermal coupling to a high temperature nuclear reactor. Therefore the sulfur (VI) oxide decomposition reaction is a potential heat sink for a high temperature nuclear reactor. Thus, optimization of catalyst selection is required, both for operational efficiency and safety. In this paper, reaction mechanisms and catalyst composition for sulfur (VI) oxide decomposition are reviewed. Chemical kinetics data from previous sulfur (VI) oxide decomposition experiments are extracted from archival journal papers or other open literature. The available experimental database suggests that Pt-based catalysts have the highest stable activity among the noble metals and Fe2O3-based catalysts have the highest stable activity among the transition metal oxides. The decomposition temperature of the corresponding metal sulfate dictates the catalytic activity of a given transition metal oxide.