424984 High-Purity Hydrogen Production at Lower Temperatures Via Sorption-Enhanced Steam Methane Reforming Using a Novel K-Doped Li4SiO4 with High-Purity CO2 Generation during Desorption Process

Thursday, November 12, 2015: 9:45 AM
255F (Salt Palace Convention Center)
Qi Zhang, Chen Shen, Sai Zhang, Dong Peng and Zibin Zhu, Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China

In this work, a novel K-doped Li4SiO4 sorbent with high capacity was applied to sorption-enhanced steam methane reforming (SE-SMR) system, and its enhancement for the steam methane reforming (SMR) reaction was investigated under various conditions. Since large amount of steam exists in the SE-SMR system, it is necessary to discuss the effects of steam on the sorbent’s sorption ability and stability first. It is found that steam can increase sorbent’s sorption ability and sorbent also shows good stability in the humidity atmosphere. When applying the novel K-doped Li4SiO4 to the SE-SMR system, the chemical equilibrium was broken and the SMR reaction was dramatically enhanced in the temperature range of 450°C-650°C. In particular, H2 yield was enhanced from 78% in the SMR system to more than 95% in the SE-SMR system at 550°C. Traditional desorption method by purging N2 at high temperatures needs further separation to obtain high-purity CO2, therefore, a novel method by purging steam to obtain high-purity CO2 using one-single step was proposed and studied in this work. The desorption ability of N2 and steam was firstly compared and the results showed that the desorption rate of steam was much faster than that of the desorption rate of N2. Furthermore, both the catalyst and K-doped Li4SiO4 sorbent present good stability, indicating its good application prospect in hydrogen production at relativitely lower temperatures.

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See more of this Session: Fundamentals of Hydrogen Production
See more of this Group/Topical: Environmental Division