Bio-tar extra-produced from biomass pyrolysis is prone to pose a threat to environment and human health.A novel N-doped porous electrode from bio-tar was produced under dual-activation of urea and KOH in this study.On...Bio-tar extra-produced from biomass pyrolysis is prone to pose a threat to environment and human health.A novel N-doped porous electrode from bio-tar was produced under dual-activation of urea and KOH in this study.Onepot dual-activation played significant roles in N-functional group and micro-mesoporous structure,which resulted in the carbon material with the highest of nitrogen content(4.08%)and the special surface area(1298.26 m^(2)·g^(−1)).Specifically,the potential mechanisms of pore formation and N-doping in the one-pot dual-activation strategy were also proposed as a consequence,the one-pot dual-activated carbon material displayed excellent electrochemical performance with the highest capacitance of 309.5 F·g^(−1) at 0.5 A·g^(−1),and the unipolar specific capacitance remained with cyclic characteristics of 80.1%after 10,000 cycles in two-electrode symmetric system.Furthermore,the one-pot dual-activation strategy could create a profit of$1.64-$2.38 per kilogram of bio-tar processed without considering the initial investment and labor costs,which provides new perspectives for the utilization of waste bio-tar.展开更多
为开拓低阶粉煤资源的高效分质利用途径,以长焰煤粉煤和生物质为主要原料,制备了生物质热解型煤,采用热重分析和固定床热解试验研究了其热解特性,并与原料粉煤进行了对比。结果表明：型煤相比原煤更易于发生热分解反应,其最大热失重速...为开拓低阶粉煤资源的高效分质利用途径,以长焰煤粉煤和生物质为主要原料,制备了生物质热解型煤,采用热重分析和固定床热解试验研究了其热解特性,并与原料粉煤进行了对比。结果表明：型煤相比原煤更易于发生热分解反应,其最大热失重速率峰温相比原煤减小;在失重率小于60%（热解温度低于503℃）时,型煤热解活化能高于原煤,失重率高于60%时,其活化能低于原煤;型煤和原煤的热解活化能主要分布在200-300、150-250 k J/mol;型煤在较低温度下热解对焦油具有较高的选择性,在高温下热解更有利于生成气体产物;型煤热解气体产物组成及其随热解温度的变化规律与原煤基本一致,但型煤热解气体中CO2的含量较原煤高0.5倍左右。展开更多
基金National Natural Science Foundation of China(52376220)National Key R&D Program of China(2022YFD2002102).
文摘Bio-tar extra-produced from biomass pyrolysis is prone to pose a threat to environment and human health.A novel N-doped porous electrode from bio-tar was produced under dual-activation of urea and KOH in this study.Onepot dual-activation played significant roles in N-functional group and micro-mesoporous structure,which resulted in the carbon material with the highest of nitrogen content(4.08%)and the special surface area(1298.26 m^(2)·g^(−1)).Specifically,the potential mechanisms of pore formation and N-doping in the one-pot dual-activation strategy were also proposed as a consequence,the one-pot dual-activated carbon material displayed excellent electrochemical performance with the highest capacitance of 309.5 F·g^(−1) at 0.5 A·g^(−1),and the unipolar specific capacitance remained with cyclic characteristics of 80.1%after 10,000 cycles in two-electrode symmetric system.Furthermore,the one-pot dual-activation strategy could create a profit of$1.64-$2.38 per kilogram of bio-tar processed without considering the initial investment and labor costs,which provides new perspectives for the utilization of waste bio-tar.
文摘为开拓低阶粉煤资源的高效分质利用途径,以长焰煤粉煤和生物质为主要原料,制备了生物质热解型煤,采用热重分析和固定床热解试验研究了其热解特性,并与原料粉煤进行了对比。结果表明：型煤相比原煤更易于发生热分解反应,其最大热失重速率峰温相比原煤减小;在失重率小于60%（热解温度低于503℃）时,型煤热解活化能高于原煤,失重率高于60%时,其活化能低于原煤;型煤和原煤的热解活化能主要分布在200-300、150-250 k J/mol;型煤在较低温度下热解对焦油具有较高的选择性,在高温下热解更有利于生成气体产物;型煤热解气体产物组成及其随热解温度的变化规律与原煤基本一致,但型煤热解气体中CO2的含量较原煤高0.5倍左右。
文摘以坡缕石为载体用共沉淀法制备了Ni-Fe/坡缕石催化剂,考察了不同煅烧温度、反应温度、水碳摩尔比条件下该催化剂对杏核热解焦油水蒸气重整制富氢气体的性能,采用扫描电镜、比表面积分析以及X射线衍射仪,对Ni-Fe/坡缕石催化剂进行了结构表征,并与其他3种生物质气化催化剂(石英砂,白云石,商业镍基催化剂Z409)进行了对比.结果表明,Ni-Fe/坡缕石催化剂具有良好的低温活性和抗积碳能力,在500℃、质量空速为0.62 h-1和水碳摩尔比为4.3的条件下,碳转化率达到了92.1%,在连续5 h的实验中未发现失活现象,而相同条件下Z409催化剂的活性寿命仅为90 min.
