Steam adsorption enhanced reaction processes are a promising process intensification for many types of reactions, where water is formed as a byproduct. To assess the potential of these processes, adequate models are required that accurately describe water adsorption, particularly under the desired elevated temperatures and pressures. In this work, an adsorption isotherm is presented for H₂O adsorption at 200–350 °C and 0.05–4.5 bar partial pressure on molecular sieve (LTA) 3A. The isotherm has been developed on the basis of experimental data obtained from a thermogravimetric analysis and integrated breakthrough curves. The experimental data at lower steam partial pressures can be described with a Generalized Statistical Thermodynamic Adsorption (GSTA) isotherm, whereas at higher steam partial pressures the experimental data can be adequately captured by capillary condensation. Based on the characteristics of the adsorbent particles, a linear driving force relation has been derived for the adsorption mass transfer rate and the apparent micropore diffusivity is determined. The isotherm and mass transport model presented here prove to be adequate for modelling and improved evaluation of steam adsorption enhanced reaction processes.

对于许多类型的反应（其中水是副产物），蒸汽吸附增强的反应过程是一种很有前途的过程强化方法。为了评估这些过程的潜力，需要有足够的模型来准确描述水的吸附，特别是在所需的高温和高压下。在这项工作中，提出了H ₂的吸附等温线O在200-350°C和0.05-4.5 bar分压下在分子筛（LTA）3A上的吸附。等温线是根据从热重分析和综合穿透曲线获得的实验数据开发的。较低的蒸汽分压下的实验数据可以用广义统计热力学吸附（GSTA）等温线描述，而在较高的蒸汽分压下，可以通过毛细管冷凝充分地捕获实验数据。根据吸附剂颗粒的特性，得出了吸附传质速率的线性驱动力关系，并确定了表观微孔扩散率。事实证明，此处介绍的等温线和传质模型对于蒸汽吸附增强反应过程的建模和改进评估是足够的。