Hydrogen Production from Sorption-Enhanced Gasification of Windbreak Wood Over a Robust Calcium-Based Metal Oxide Catalyst Derived from Waste Eggshell

Abstract

Wasted wood and eggshells produced in urban and rural areas generate a great deal of pollution. Utilizing discarded eggshells as raw materials to derive CO2  sorbent and catalyst that are employed for waste windbreak wood gasification would not only be in favor of reducing pollutant emissions but also convert them into clean and pollution-free hydrogen energy. In this work, waste eggshell was acted as a calcium source to prepare CaO and composite NiCaFeOx, implemented for air and air-steam gasification of windbreak wood for sorption enhanced hydrogen production. X-ray diffraction, BET, SEM-EDS, CO2-TPD, H2-TPR and TG were carried out to characterize the properties of the sorbent and catalyst. The emitted gaseous components of windbreak decomposition were detected by the TG-GC-MS program. From the results, a stacking dual pore size structure was formed on the NiCaFeOx catalyst. Eggshell derived CaO displayed a higher  CO2 sorption capacity than commercial CaO. The CO2 content in gaseous products was effectively restricted to the range of 1.86-11.29 vol.% with the highest H2 proportion of 64.49 vol.%. This work offered a viable approach to utilizing waste wood and eggshells as well as converting them into green hydrogen energy and reducing CO2 emissions.

Keywords: Sorption enhanced hydrogen production, air gasification, air-steam gasification, waste eggshell, calcium-based metal oxide catalyst, windbreak wood