A green route for hydrogen production from alkaline thermal treatment (ATT) of biomass with carbon storage

Temperature-Programmed Alkaline Thermal Treatment of Lignocellulosic Biomass to Produce Fractionated Hydrogen with High Production Capacity

“…To obtain H 2 with a purity higher than 98%, the optimal temperature of the low-temperature ATT is 210 °C for cellulose and xylan and 235 °C for lignin. However, the lower temperatures are not conducive to the alkalinization reaction, , resulting in H 2 productions from low-temperature ATTs of cellulose, xylan, and lignin being only 58, 70, and 11% of the total H 2 productions correspond to the conventional ATT process. Nevertheless, according to the results in Figure a–c, the introduction of H 2 O (0.55 mmol·min –1 ) does not change the initial H 2 production temperature but significantly increases the H 2 production rate above 300 °C, suggesting that it is feasible to increase the H 2 production by introducing H 2 O into the ATT process above 300 °C, especially for cellulose and lignin.…”

“…To obtain H 2 with a purity higher than 98%, the optimal temperature of the lowtemperature ATT is 210 °C for cellulose and xylan and 235 °C for lignin. However, the lower temperatures are not conducive to the alkalinization reaction, 3,21 resulting in H 2 productions To obtain high-purity H 2 and improve H 2 production, TP-ATT is introduced with well-programmed temperature evolution during the process, as shown in Figure 1g−i. The results show that the formation rates of H 2 and CH 4 during the fast heating and second thermostatic processes are significantly increased, and the reaction time is further reduced for all three feedstocks.…”

“…Hydrogen (H 2 ) production from biomass is one of the sustainable approaches to alleviate the centralized dependence of various regions on fossil energy sources and to promote a low-carbon economy. , Alkali thermal treatment (ATT) of biomass is a slow pyrolysis process for H 2 production at medium temperatures proposed in recent years, usually carried out at atmospheric pressure and below 600 °C with a low and constant heating rate (2–10 °C·min –1 ). , Compared with fast pyrolysis, steam gasification, and supercritical gasification of biomass, − ATT technology exhibits high purity of H 2 production as well as obvious advantages in processing cost. In addition, the in situ carbon sequestration capability of alkali enables the preparation of carbon-negative H 2 , which has great potential for application in the energy and chemical industries.…”