Heterogeneously catalysed combustion in a continuously stirred tank reactor—low-temperature reactions
Heterogeneously catalysed combustion in a continuously stirred tank reactor—low-temperature reactions
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连续搅拌釜反应器中的非均相催化燃烧——低温反应
DOI：
10.1088/1364-7830/4/1/301
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发表时间：
2000
影响因子：
1.3
通讯作者：
X. Chen
中科院分区：
文献类型：
--
作者：
M. Nelson;G. Wake;X. Chen
本文建立并分析了气体在非绝热连续搅拌釜式反应器中进行单步放热反应的非均相催化反应模型。假设反应条件为低温，因此流入物在气相的降解可以忽略不计。活性物质在固体催化剂层上的吸附和解吸被明确地模拟。在此条件下，不表现出经典的s型稳态燃烧曲线。相反，稳态图由两条不相交的溶液曲线组成：一条溶液曲线包含一个稳态分支，对应于催化剂的完全覆盖，没有转化；并且，一个包含稳态分支的孤立体对应于低催化剂覆盖率和高流入物转化率。稳态曲线有一个灭点，没有点。因此，初始条件决定了系统演化到何种稳定状态。随着反应器初始温度的变化，临界催化表面积也发生了很大的变化。预计这将产生重大的实际影响。
In this paper a model for the heterogeneously catalysed reaction of a gaseous species undergoing a single-step exothermic reaction in a well mixed diabatic continuously stirred tank reactor is developed and analysed. Low-temperature reaction conditions are assumed, so that the degradation of the inflow species in the gas phase is negligible. The adsorption and desorption of the active species onto a solid catalyst layer is explicitly modelled.Under the conditions used, the classic combustion S-shape steady-state curve is not exhibited. Instead the steady-state diagram consists of two disjoint solution curves: a solution curve containing a steady-state branch corresponding to full coverage of the catalyst with no conversion; and, an isola containing a steady-state branch that corresponds to low coverage of the catalyst with a high conversion of the inflow species. The steady-state curve contains one extinction point and no ignition points. Consequently the initial conditions determine onto which steady state the system evolves. Large variations in the critical catalytic surface area are found as the initial temperature of the reactor is varied. This is expected to have significant practical implications.