Improving hydrogen-rich gas production from biomass catalytic steam gasification over metal-doping porous biochar
Ge Kong, Quan Liu, Guanya Ji, Haoyang Jia, Tianqi Cao, Xuesong Zhang, Lujia Han
Abstract
Biomass to green H 2 is a new route to produce sustainable energy. This study aimed to boost H 2 -enriched gas production via gasification-catalytic steam reforming (GCSR) process of wheat straw (WS) over Ni, Fe, or Zn-doped carbon materials (MDCMs). Initially, steam injection rate (1 g/min) and residence time (15 min) was optimized based on the tradeoff between energy consumption and H 2 -rich gas generation. The largest gas yield (90.77 mmol/g) and the lowest H 2 production efficiency ( ƞ : 7.89 g CO 2 /g H 2 ) were observed for WS-derived biochar. Clearly, it was found MDCMs were favorable for reducing CO 2 production due to the strengthened CO 2 reforming reactions catalyzed by metal active sites. A higher ƞ (6.72 g CO 2 /g H 2 ) was achieved for Ni-doping biochar (Ni/C). Importantly, Ni/C showed the ultrahigh carbon conversion efficiency (99.47%) and great tar elimination performance. Overall, GCSR process over MDCMs is a newly promising way to valorize biomass into H 2 -rich gas.