School of Environment, Tsinghua University , Beijing, 100084, China.
School of Chemical and Process Engineering (SCAPE), University of Leeds , Leeds LS2 9JT, United Kingdom.
Environ Sci Technol. 2017 Jan 3;51(1):12-27. doi: 10.1021/acs.est.6b04992. Epub 2016 Dec 20.
Sorption-enhanced steam reforming (SESR) is an energy and cost efficient approach to produce hydrogen with high purity. SESR makes it economically feasible to use a wide range of feedstocks for hydrogen production such as methane, ethanol, and biomass. Selection of catalysts and sorbents plays a vital role in SESR. This article reviews the recent research aimed at process intensification by the integration of catalysis and chemisorption functions into a single material. Alkali metal ceramic powders, including LiZrO, LiSiO and NaZrO display characteristics suitable for capturing CO at low concentrations (<15% CO) and high temperatures (>500 °C), and thus are applicable to precombustion technologies such as SESR, as well as postcombustion capture of CO from flue gases. This paper reviews the progress made in improving the operational performance of alkali metal ceramics under conditions that simulate power plant and SESR operation, by adopting new methods of sorbent synthesis and doping with additional elements. The paper also discusses the role of carbonates formed after in situ CO chemisorption during a steam reforming process in respect of catalysts for tar cracking.
吸附增强蒸汽重整（SESR）是一种高效节能的方法，可生产高纯度氢气。SESR 使得使用广泛的原料（如甲烷、乙醇和生物质）生产氢气在经济上变得可行。催化剂和吸附剂的选择在 SESR 中起着至关重要的作用。本文综述了最近的研究，旨在通过将催化和化学吸附功能集成到单一材料中实现工艺强化。碱金属陶瓷粉末，包括 LiZrO、LiSiO 和 NaZrO，具有在低浓度（<15% CO）和高温（>500°C）下捕获 CO 的特性，因此适用于 SESR 等预燃烧技术，以及从烟道气中捕获 CO 的后燃烧技术。本文综述了通过采用新的吸附剂合成方法和添加其他元素的掺杂方法，在模拟电厂和 SESR 运行条件下，提高碱金属陶瓷操作性能方面所取得的进展。本文还讨论了在蒸汽重整过程中原位 CO 化学吸附后形成的碳酸盐在焦油裂化催化剂方面的作用。
