Enhanced hydrogen production by the catalytic alkaline thermal gasification of cellulose with Ni/Fe dual-functional CaO based catalysts. (21st September 2021)

• Record Type: Journal Article
• Authors: Zeng, Xi; Fang, Mengxiang; Lv, Tong; Tian, Jianglei; Xia, Zhixiang; Cen, Jianmeng; Wang, Qinhui
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 65(2021)
• Page Start: 32783
• Page End: 32799
• Publication Date: 2021-09-21
• Subjects: Biomass -- Hydrogen production -- Alkaline thermal gasification -- Catalytic reforming -- Ni/Fe dual-functional CaO based Catalysts -- CO2 capture; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.07.142
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A two-stage system involving alkaline thermal gasification of cellulose with Ca(OH)2 sorbent and catalytic reforming with Ni/Fe dual-functional CaO based catalysts is proposed and applied to enhance H2 production and in-situ CO2 capture. The results show that the H2 concentration is maximized at a considerably lower temperature (500 °C) than commercialized biomass gasification processes, reducing energy consumption. Sol-gel method is deemed better than impregnation method for its lower cost and higher-concentration H2 production. Among the prepared catalysts, sol-NiCa catalyst exhibits the best performance in CO2 absorption, resistance to carbon deposition, and cyclic stability, creating maximum H2 concentration (79.22 vol%), H2 yield (27.36 mmol g −1 cellulose), and H2 conversion (57.61%). Introduction of Ni rather than Fe on the CaO based catalyst promotes steam methane reforming at moderate temperature range of 400–600 °C, generating low contents of CH4 (5.38 vol%), CO2 (4.82 vol%), and CO (10.58 vol%). Graphical abstract: Image 1 Highlights: A two-stage system involving alkaline thermal gasification and catalytic reforming. Sol-gel shows higher-concentration H2 production and lower cost than impregnation. Introduction of Ni rather than Fe on CaO catalysts promotes SMR at 400–600 °C. Sol-NiCa catalyst exhibits good carbon deposition resistance and cyclic stability. Maximum H2 concentration (79.22 vol%) is achieved at moderate temperature of 500 °C.