Sorption-enhanced steam reforming of CH4/CO2 synthetic mixture representing biogas over porous Ni-CaO-MgO microsphere via a surface modified carbon template

Sorption-enhanced steam reforming of biogas (SESRB) provides an efficient way to obtain high-purity hydrogen from biogas. Highly effective bi-functional adsorbent/catalyst ma-terials play a key role in the long-term operation of SESRB process. Here a general template -based approach using carbon microspheres with alkali modification (MCS) as sacrificial templates to synthesize highly effective bi-functional catalyst is reported. FT-IR, XPS and TGA confirm the enhanced adsorption capacity of MCS to metal ions due to the existence of rich oxygen containing functional groups. The amount of the obtained bi-functional catalyst is increased by 14 times after NaOH treatment. Electron microscopy analysis shows the uniformity of composition and the formation of a favorable morphology, including porous structure and separated nanoparticles, are the crucial for yielding high-performance bi-functional catalyst. Due to the excellent stability of the catalyst structure, 92.3 vol % of hydrogen (dry and inert-free gas basis) with 92% CH4 conversion is obtained over the 1Ni-CaMg6-M catalyst for 10 consecutive reaction-desorption cycles.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study reports a general template-based approach using carbon microspheres and alkali modification to synthesize highly effective bi-functional catalyst, which exhibits excellent stability and high performance.