Hydrogen-Rich Syngas Production from Chemical Looping Gasification of Biomass Char with CaMn_1–xFe_xO₃

Abstract

The chemical looping process is considered as a suitable way to produce hydrogen and syngas. CaMnO3, CaFeO3, and CaMn1–x Fe x O3 (x = 0.2 and 0.4) perovskites were prepared via the sol–gel method. Perovskites were characterized by X-ray diffraction and thermogravimetry and tested for hydrogen-rich syngas production from steam gasification of rice husk char in a fixed bed. The effect of four types of perovskites, temperature (700–900 °C), and steam/char mass ratio (3.6–8.4) on the hydrogen yield was investigated. The results showed that the H2/CO ratio order is CaMn0.6Fe0.4O3 > CaMn0.8Fe0.2O3 > CaFeO3 > CaMnO3 at 750 °C and steam/char mass ratio of 4.8. The chemical looping steam gasification process of rice husk char with perovskites was divided into three stages: (a) uncouple oxygen, (b) catalytic gasification, and (c) partial decomposition. On the basis of CaMn0.6Fe0.4O3 as a reaction material, the best operation conditions for the hydrogen-rich syngas gasification process are 800 °C and steam/char mass ratio of 7.2. The results also demonstrated that the higher steam/char mass ratio (8.4) carried out excessive heat based on computational fluid dynamics simulation. In addition, in comparison to the gasification reaction with CaMn0.6Fe0.4O3 at the optimum condition, the yield of CO is higher by the gasification reaction without CaMn0.6Fe0.4O3. CaMn0.6Fe0.4O3 easily selects catalysis to CO than H2.

Hydrogen‐rich syngas production from chemical looping steam reforming of bio‐oil model compound: Effect of bimetal on LaNi 0.8 M 0.2 O 3 (M = Fe, Co, Cu, and Mn)

“…They are denoted as LN, LNFe, LNCo, LNMn, and LNCu, respectively. The process of preparation was described as follow . The required amount of La (NO 3 ) 3 ·6H 2 O, Ni (NO 3 ) 2 ·6H 2 O, Cu (NO 3 ) 2 ·3H 2 O, Fe (NO 3 ) 3 ·9H 2 O, Co (NO 3 ) 2 ·6H 2 O, and Mn (NO 3 ) 2 ·4H 2 O were weighed at a desired stoichiometric ratio, respectively.…”

Mini Review of Catalytic Reactive Flash Volatilization of Biomass for Hydrogen-Rich Syngas Production

“…Effect of the steam/carbon input ratio on the H 2 /CO ratio of product gas. Gasification temperatures of (blue ■) <700 °C, (dark blue ▲) 700–799 °C, (black ●) 800–900 °C, and (red ◆) >900 °C (metaplot based on the data taken from refs , , , , , , , and − ).…”

Study on the reaction performance of Ce‐doped NiFe 2 O 4 oxygen carriers in the process of chemical looping hydrogen production

“…The CLH system consists of three reactors: fuel reactor, steam reactor, and air reactor. Hydrogen is produced mainly in the steam reactor 12‐15 …”