Biomass pyrolysis oils for hydrogen production using chemical looping reforming
Biomass pyrolysis oils for hydrogen production using chemical looping reforming
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DOI：
10.1016/j.ijhydene.2011.05.083
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发表时间：
2012
影响因子：
7.2
通讯作者：
A. Lea-Langton;R. M. Zin;V. Dupont;M. Twigg
中科院分区：
文献类型：
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作者：
A. Lea-Langton;R. M. Zin;V. Dupont;M. Twigg
本研究认为，使用高含氧和挥发性热解油生物质废物作为可持续的液体燃料转化为富氢合成气，使用化学链重整过程中的填充床的可行性。以Ni/Al_2O_3催化剂为氧传递材料，研究了松油和棕榈空果串油（EFB）的氧传递性能。在600 °C和常压下考察了水蒸气与碳的摩尔比（S/C）和重时空速对燃料和水蒸气转化率、H2产率以及H和C产物分布的影响。在向下燃料进料配置和使用H2减少的催化剂的情况下，在S/C比分别为2.3和2.6（基于无水油）时，松油和EFB油的最大平均燃料转化率分别为97%和89%。这产生了H2的产率效率约为60%的松油和80%的EFB油，尽管平衡的限制，并与很少的CH 4副产品。两种油在不同的S/C下表现出非常相似的输出。在短的循环次数，即从油还原催化剂开始，燃料转化率略有下降，但蒸汽转化率是恒定的，导致H2产率缓慢下降。尽管它们的氧含量水平高，但热解油显示在重复循环时保持接近90%的氧化催化剂还原，但还原速率随着循环而降低。
This study considers the feasibility of using highly oxygenated and volatile pyrolysis oils from biomass wastes as sustainable liquid fuels for conversion to a hydrogen-rich syngas using the chemical looping reforming process in a packed bed. Pine oil and palm empty fruit bunches oil- ‘EFB’- were investigated with a Ni/Al2O3catalyst doubling as oxygen transfer material (OTM). The effect of molar steam to carbon ratio (S/C) and weight hourly space velocity were investigated at 600 °C and atmospheric pressure on the fuel and steam conversion, the H2yield and the H- and C-products distribution. With a downward fuel feed configuration and using a H2-reduced catalyst, maximum averaged fuel conversions of ∼97% for pine oil and 89% for EFB oil were achieved at S/C ratios of 2.3 and 2.6 respectively (on a water-free oil basis). This produced H2with a yield efficiency of approximately 60% for pine oil and 80% for EFB oil notwithstanding equilibrium limitations, and with little CH4by-product. Both oils exhibited very similar outputs with varying S/C. Upon a short number of cycles, i.e. starting from an oil-reduced catalyst, the fuel conversion dropped slightly but the steam conversion was constant, resulting in a slow decrease in H2yield. Despite their high level of oxygen content, the pyrolysis oils were shown to maintain close to 90% reduction of the oxidised catalyst upon repeated cycles, but the rate of reduction decreased with cycling.