当前位置: X-MOL 学术Renew. Sust. Energ. Rev. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Sustainable gasification biochar as a high efficiency adsorbent for CO2 capture: A facile method to designer biochar fabrication
Renewable and Sustainable Energy Reviews ( IF 15.9 ) Pub Date : 2020-02-27 , DOI: 10.1016/j.rser.2020.109785
Pavani Dulanja Dissanayake , Seung Wan Choi , Avanthi Deshani Igalavithana , Xiao Yang , Daniel C.W. Tsang , Chi-Hwa Wang , Harn Wei Kua , Ki Bong Lee , Yong Sik Ok

Biochars can be a potential means of CO2 capture if designed with hierarchical structures and suitable surface properties. Objective of this research was to assess the effectiveness of KOH activation and a combination of KOH and CO2 activation for enhancing the CO2 adsorption capacity of gasification biochar. Biochars were produced with either 100% wood chips (W) or a mixture of 70% wood chips and 30% chicken manure (WCM) through gasification, and then activated using either 1 M KOH (sample label appended with “K”) or 1 M KOH and 500 mL CO2 min−1 at 850 °C (sample label appended with “KC”). The pristine and activated biochars were evaluated in terms of physicochemical properties, CO2 adsorption capacity at 25 °C, adsorption kinetics, and regeneration ability. The WCMK biochar exhibited the highest CO2 adsorption capacity (2.92 mol/kg) with highest surface area (1408 m2/g), micropore area (690.18 m2/g), and micropore volume (0.36 cm3/g). WKC and WK showed comparable CO2 adsorptions, both of which were lower than that of WCMK. Both WCMK and WKC showed considerable selectivity for CO2 over N2, fast adsorption and excellent regeneration abilities over 10 consecutive adsorption-desorption cycles. Activation of biochar, either with KOH or KOH + CO2, enhanced its CO2 adsorption capacity due to an increase in surface area and microporosity, irrespective of the feedstock type. However, hydrophobicity, and aromaticity of biochar and presence of hetero atoms (N and S) also positively influenced CO2 adsorption capacity of biochar. Both KOH and KOH + CO2 activation will be promising options for enhancing CO2 adsorption capacity of pristine biochar irrespective of the feedstock type.



中文翻译:

可持续的气化生物炭作为一种高效的CO 2捕集吸附剂:设计生物炭的简便方法

如果设计成分层结构和合适的表面特性,生物炭可能是捕获CO 2的潜在手段。这项研究的目的是评估KOH活化以及结合KOH和CO 2活化对增强气化生物炭的CO 2吸附能力的有效性。生物炭是通过气化用100%木屑(W)或70%木屑和30%鸡粪(WCM)的混合物生产的,然后用1 M KOH(样品标签附加“ K”)或1激活 在850°C下使用M KOH和500 mL CO 2 min -1(样品标签附加“ KC”)。根据理化性质,CO 2对原始和活化的生物炭进行了评估在25°C下的吸附容量,吸附动力学和再生能力。WCMK生物炭表现出最高的CO 2吸附容量(2.92 mol / kg),最高的表面积(1408 m 2 / g),微孔面积(690.18 m 2 / g)和微孔体积(0.36 cm 3 / g)。WKC和WK显示出可比的CO 2吸附,两者均低于WCMK。WCMK和WKC在连续10次连续的吸附-解吸循环中均表现出对N 2而言对CO 2的选择性,快速吸附和出色的再生能力。用KOH或KOH + CO 2活化生物炭可提高其CO 2由于表面积和微孔率的增加而引起的吸附能力,与原料类型无关。但是,生物炭的疏水性和芳香性以及杂原子(N和S)的存在也对生物炭的CO 2吸附能力产生了积极影响。无论原料类型如何,KOH和KOH + CO 2活化都将是提高原始生物炭对CO 2吸附能力的有前途的选择。

更新日期:2020-02-27
down
wechat
bug