Impact of Potassium and Phosphorus in Biomass on the Properties of Fast Pyrolysis Bio-oil
Impact of Potassium and Phosphorus in Biomass on the Properties of Fast Pyrolysis Bio-oil
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DOI：
10.1021/acs.energyfuels.6b01044
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发表时间：
2016-10-01
期刊：
影响因子：
5.3
通讯作者：
Bridgwater, Anthony V.
中科院分区：
文献类型：
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作者：
Banks, Scott W.;Nowakowski, Daniel J.;Bridgwater, Anthony V.
本研究探讨了从碱金属浸渍的生物质（山毛榉木）生产的快速热解生物油。浸渍的目的是研究作为钾或磷的结果的热解蒸气的催化裂化。人们认识到，生物质中的钾和磷可对热转化过程产生重大影响。当生物质在碱金属阳离子的存在下热解时，热解液体的催化裂化在气相中发生，减少了产生的有机液体并增加了水、炭和气体的产率，导致生物油具有较低的热值和增加的相分离机会。山毛榉木材浸渍钾或磷（K浸渍和P浸渍，分别）在0.10-2.00重量%的范围内。采用热解-气相色谱-质谱联用（Py-GC-MS）分析了热解过程中的热解产物，采用热重分析（TGA）分析了热解产物中的残炭和挥发分的分布。钾和磷都被认为是催化生物质的热解分解并改变产物的产率。3-糠醛和左旋葡萄糖酮成为更占主导地位的产品后P浸渍，在热解过程中的重排和脱水路线。钾对纤维素和半纤维素分解具有显著影响，不仅对左旋葡聚糖的形成，而且对其他物质如2（SH）-呋喃酮或羟甲基-环戊烯衍生物的形成。快速热解处理也已使用实验室规模的连续进料鼓泡流化床反应器进行，其标称容量为1 kg h（-1），反应温度为525 ℃。在稳定性评估测试期间，观察到生物油的粘度随着增加而增加。两种添加剂的浸渍百分比。这是因为生物油在储存时由于无机含量而发生聚合。大部分无机物集中在炭中，但少量无机物夹带在热解蒸气中，因此最终进入生物油中。
This study investigates fast pyrolysis bio-oils produced from alkali-metal-impregnated biomass (beech wood). The impregnation aim is to study the catalytic cracking of the pyrolysis vapors as a result, of potassium or phosphorus. It is recognized that potassium and phosphorus in biomass can have a major impact on the thermal conversion processes. When biomass is pyrolyzed in the presence of alkali metal cations, catalytic cracking of the pyrolysis liquids occurs in the vapor phase, reducing the organic liquids produced and increasing yields of water, char, and gas, resulting in a bio-oil that has a lower calorific value and an increased chance of phase separation. Beech wood was impregnated with potassium or phosphorus (K impregnation and P impregnation, respectively) in the range of 0.10-2.00 wt %. Analytical pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) was used to examine the pyrolysis products during thermal degradation, and thermogravimetric analysis (TGA) was used to examine the distribution of char and volatiles. Both potassium and phosphorus are seen to catalyze the pyrolytic decomposition of biomass and modify the yields of products. 3-Furaldehyde and levoglucosenone become more dominant products upon P impregnation, pointing to rearrangement and dehydration routes during the pyrolysis process. Potassium has a significant influence on cellulose and hemicellulose decomposition, not just on the formation of levoglucosan but also other species, such as 2(SH)-furanone or hydroxymethyl-cyclopentene derivatives. Fast pyrolysis processing has also been undertaken using a laboratory-scale continuously fed bubbling fluidized-bed reactor with a nominal capacity of 1 kg h(-1) at the reaction temperature of 525 degrees C. An increase in the viscosity of the bio-oil during the stability assessment tests was observed with an increasing. percentage of impregnation for both additives. This is because bio-oil undergoes polymerization while placed in storage as a result of the inorganic content. The majority of inorganics are concentrated in the char, but small amounts are entrained in the pyrolysis vapors and, therefore, end up in the bio-oil.