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- W2613462099 abstract "Abstract Chemical looping gasification (CLG) involves the use of an oxygen carrier (OC) which transfers oxygen from air to solid fuel to convert the fuel into synthesis gas, and the traditional gasifying agents such as oxygen-enriched air or high temperature steam are avoided. In order to improve the reactivity of OC with biomass char, facilitating biomass high-efficiency conversion, a compound Fe/Ni bimetallic oxide (NiFe2O4) was used as an OC in the present work. Effect of OC content and oxygen sources on char gasification were firstly investigated through a TG reactor. When the OC content in mixture sample attains 65 wt.%, the sample shows the maximum weight loss rate at relatively low temperature, indicating that it is very favorable for the redox reactions between OC and biomass char. The NiFe2O4 OC exhibits a good performance for char gasification, which is obvious higher than that of individual Fe2O3 OC and mechanically mixed Fe2O3 + NiO OC due to the Fe/Ni synergistic effect in unique spinel structure. According to the TGA experimental results, effect of the steam content and cyclic numbers on char gasification were investigated in a fixed bed reactor. Either too low steam content or too high steam content doesn't facilitate the char gasification. And suitable steam content of 56.33% is determined with maximum carbon conversion of 88.12% and synthesis gas yield of 2.58 L/g char. The reactivity of NiFe2O4 OC particles shows a downtrend within 20 cycles (∼64 h) due to the formation of Fe2O3 phase, which is derived from the iron element divorced from the Fe/Ni spinel structure. Secondly, the sintering of OC particles and ash deposit on the surface are also the reasons for the deactivation of NiFe2O4 OC. However, the carbon conversion and synthesis gas yield at the 20th cycle are still higher than those of the blank experiment. It indicates that the reactivity of NiFe2O4 OC can be maintained at a relatively long time and NiFe2O4 material can be used as a good OC candidate for char gasification in the long time running." @default.
- W2613462099 created "2017-05-19" @default.
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- W2613462099 date "2017-05-01" @default.
- W2613462099 modified "2023-10-17" @default.
- W2613462099 title "Reactivity investigation on chemical looping gasification of biomass char using nickel ferrite oxygen carrier" @default.
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- W2613462099 doi "https://doi.org/10.1016/j.ijhydene.2017.04.246" @default.
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