Steam methane reforming reaction enhanced by a novel K2CO3-Doped Li4SiO4 sorbent: Investigations on the sorbent and catalyst coupling behaviors and sorbent regeneration strategy
Steam methane reforming reaction enhanced by a novel K2CO3-Doped Li4SiO4 sorbent: Investigations on the sorbent and catalyst coupling behaviors and sorbent regeneration strategy
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DOI：
10.1016/j.ijhydene.2015.12.116
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发表时间：
2016-03
影响因子：
7.2
通讯作者：
Qi Zhang;Chen Shen;Sai Zhang;Yong-qiang Wu
中科院分区：
文献类型：
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作者：
Qi Zhang;Chen Shen;Sai Zhang;Yong-qiang Wu
将自制的K2CO3掺杂Li4SiO4吸附剂应用于吸附强化水蒸气甲烷重整制氢(SE-SMR)系统。活性K_2CO_3掺杂的Li4SiO_4吸附剂和Ni/γ-Al_2O_3催化剂均表现出良好的活性和稳定性。结果表明，将活性K2CO3掺杂的Li4SiO4吸附剂应用到SMR体系中，可以显著提高SMR过程的效率。在相对较低的温度下(500-550℃)获得了高纯度氢气(氢产率为95%)，比使用钙基脱硫剂的温度低100-150℃。此外，还讨论了不同的吸收-催化剂耦合方法和颗粒尺寸对反应物扩散的影响，发现原位强化和适中的颗粒尺寸(20-40目)对反应体系有利。最后，提出了合理的脱硫剂再生策略。结果表明，水蒸气提高了脱附剂的再生率，对脱附剂和催化剂的活性影响不大，可直接获得高纯度的CO2，简化了后续的分离工艺，便于吸附-脱附操作设计。
A homemade K2CO3-doped Li4SiO4sorbent was applied into the sorption-enhanced steam methane reforming (SE-SMR) system. Both the activated K2CO3-doped Li4SiO4sorbent and the Ni/γ-Al2O3catalyst showed good activity and stability. The result shows that the application of the activated K2CO3-doped Li4SiO4sorbent into SMR system can remarkably enhance the process. High-purity hydrogen (H2yield >95%) was obtained at relatively low temperatures (500–550 °C), which was 100–150 °C lower than that of using the calcium-based sorbents. Furthermore, the effects of different absorbent-catalyst coupling methods and particle sizes on the reactant diffusion were also discussed, finding that in-situ enhancement and moderate particle sizes (20–40 mesh) were beneficial for the reaction system. Finally, a reasonable sorbent regeneration strategy was proposed. It is found that steam enhances the regeneration rate of sorbent and has little negative effects on the activity of sorbent and catalyst, which makes it possible to obtain high-purity CO2directly and simplify the subsequent separation process for the sorption-desorption operation design.