Sorption-enhanced steam reforming of ethanol (SE-SRE) with in-situ CO₂ removal is an environmentally friendly and sustainable approach for hydrogen production. Researches on continuous production of high-purity H₂ by SE-SRE over the modified Li₄SiO₄ sorbent were conducted using two parallel reactor in this work. The low cost Li₄SiO₄ derived from rice husk ash (RHA) is a promising high-temperature CO₂ sorbent. However, the poor adsorption kinetics of RHA-Li₄SiO₄ sorbent at low CO₂ concentration is the major challenge. The metallic elements (K, Ca, Al, Mg) were employed to modify the RHA-Li₄SiO₄ for efficient CO₂ capture. The developed sorbents were characterized and tested to study the role of dopants on the crystal, textural, microstructure and CO₂ adsorption kinetics and cyclic stability. Results indicated that K doping effectively inhibited the growth of crystal aggregation and resulted in a fluffy morphology with abundant pores and higher specific surface area, while the addition of Ca, Al and Mg formed a nubby structure with larger particle size. K-doped RHA-Li₄SiO₄ exhibited the best CO₂ uptake properties and the optimal K doping molar content was 0.02 with the maximum capture capacity of 34.16 wt%, which is higher than 27.1 wt% of pure RHA-Li₄SiO₄. Then, the effect of operating conditions on the enhancement behaviors was considered in the SE-SRE system. High-purity H₂ (above 96%) was achieved by coupling K(0.02)/RHA-Li₄SiO₄ sorbent with Ni-based catalyst under the optimum condition (T: 525 °C, liquid hourly space velocity: 0.9 mL/(g·h), sorbent/catalyst: 4 and steam/carbon: 8.0). The adsorption activity of K(0.02)/RHA-Li₄SiO₄ maintained at a high level in ten SE-SRE/regeneration cycles. Finally, a scheme including two parallel fixed-bed reactors was designed and operated periodically for continuous production of high-purity H₂. The reaction switching time was shown to depend strongly on the pre-breakthrough time and operating conditions. As the reaction switching time was 40 min, the products were always only H₂ and CH₄ (no CO and CO₂ appear) and the H₂ purity remained above 90% during 400 min, confirming high purity hydrogen stream can be obtained continuously.

原位去除CO ₂的乙醇的吸附增强蒸汽重整（SE-SRE）是一种环保且可持续的制氢方法。这项工作是使用两个并联反应器进行的，研究了在改性的Li ₄ SiO ₄吸附剂上用SE-SRE连续生产高纯度H ₂的方法。源自稻壳灰（RHA）的低成本Li ₄ SiO ₄是一种有前途的高温CO ₂吸附剂。但是，RHA-Li ₄ SiO ₄吸附剂在低CO _2下的吸附动力学较差。集中精神是主要挑战。金属元素（K，Ca，Al，Mg）用于修饰RHA-Li ₄ SiO ₄以便有效捕获CO ₂。对已开发的吸附剂进行表征和测试，以研究掺杂剂对晶体，织构，微观结构以及CO ₂吸附动力学和循环稳定性的作用。结果表明，钾掺杂有效地抑制了晶体聚集的生长，并导致了蓬松的形貌，具有丰富的孔洞和更高的比表面积，而钙，铝和镁的添加形成了较大粒径的块状结构。掺K的RHA-Li ₄ SiO ₄表现出最好的CO ₂的吸收特性和最佳的K掺杂摩尔含量为0.02，最大捕获容量为34.16 wt％，高于纯RHA-Li ₄ SiO _4的27.1 wt％。然后，在SE-SRE系统中考虑了操作条件对增强行为的影响。在最佳条件下（T：525°C，液时空速：0.9 mL / min），通过将K（0.02）/ RHA-Li ₄ SiO ₄吸附剂与镍基催化剂偶联，可实现高纯度H ₂（96％以上）（g·h），吸附剂/催化剂：4，蒸汽/碳：8.0）。K（0.02）/ RHA-Li ₄ SiO ₄的吸附活性在十个SE-SRE /再生周期中保持较高的水平。最后，设计并包括两个平行的固定床反应器的方案并定期运行以连续生产高纯度H ₂。已显示反应切换时间很大程度上取决于预突破时间和操作条件。当反应切换时间为40分钟时，产物始终仅是H ₂和CH ₄（没有CO和CO ₂出现），并且在400min内H ₂纯度保持在90％以上，证实可以连续获得高纯度氢流。