Fluidizable reforming catalyst development for conditioning biomass-derived syngas
Fluidizable reforming catalyst development for conditioning biomass-derived syngas
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DOI：
10.1016/j.apcata.2006.11.005
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发表时间：
2007-02
影响因子：
5.5
通讯作者：
K. Magrini-Bair;S. Czernik;R. French;Y. Parent;E. Chornet;D. Dayton;C. Feik;R. Bain
中科院分区：
文献类型：
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作者：
K. Magrini-Bair;S. Czernik;R. French;Y. Parent;E. Chornet;D. Dayton;C. Feik;R. Bain
采用多级催化剂开发方法对生物质气化合成气的可流化焦油重整催化剂进行了评价和优化。先前的研究表明，催化剂流化可以有效地将生物质热解油及其馏分转化为合成气，因为流化优化了催化剂颗粒与原料之间的接触，同时减少了焦炭的形成。像热解油这样的生物质衍生焦油也是复杂的，主要是芳香族原料，需要流化来提高转化效率。由于工业重整催化剂是为固定床操作设计的，而不是为流化处理设计的，因此需要开发耐磨损的支撑和催化剂。我们在流态化蒸汽重整条件下鉴定并测试了颗粒氧化铝的耐磨性，并从最强的载体制备了镍基催化剂。在微活性测试系统（MATS）上测试了这些催化剂的性能，该系统使用1g催化剂，具有高通量，并测量了氧化，还原和模拟焦油化合物蒸汽重整。接下来，在实验室规模的流化床反应器中，使用250g催化剂，使用更现实的流动条件和输入流，对MATS筛选中有希望的候选物进行评估。然后在实验室流化床中制备了一批60公斤的最佳催化剂，并在中试反应器中对生物质合成气调节进行了评估。用扫描电子、能量色散x射线和电感耦合等离子体光谱对新催化剂和旧催化剂进行了表征。通过多阶段测试，在100-400μm大小的90% α -氧化铝颗粒上，镍、镁和钾的催化剂活性最高，耐磨损。
A multi-stage catalyst development approach is used to evaluate and optimize fluidizable tar reforming catalysts for conditioning syngas from biomass gasification. Previous work showed that catalyst fluidization is required to efficiently reform biomass-derived pyrolysis oil and its fractions to syngas as fluidization optimizes contact between catalyst particles and feedstocks while reducing coke formation. Biomass-derived tars like pyrolysis oils are also complex, largely aromatic feedstocks that require fluidization to improve reforming efficiency. Because industrial reforming catalysts are designed for fixed-bed operations and not for fluidized processing, attrition resistant supports and catalysts required development. We identified and tested particulate aluminas for attrition resistance under fluidized steam reforming conditions and prepared nickel-based catalysts from the strongest supports. The performance of these catalysts was tested in a microactivity test system (MATS), which used 1g catalyst quantities, had high throughput, and measured oxidation, reduction and model tar compound steam reforming. Promising candidates from MATS screening were next evaluated in a laboratory-scale fluidized bed reactor with 250g of catalyst using more realistic flow conditions and input streams. A 60kg batch of the best catalyst identified in the laboratory fluid bed was then prepared and evaluated for biomass-derived syngas conditioning in a pilot-scale reformer. Fresh and used catalysts were characterized with scanning electron, energy dispersive X-ray, and inductively coupled plasma spectroscopies. The most active and attrition resistant catalyst identified through multi-stage testing contains nickel, magnesium and potassium on 90% alpha alumina particles of 100–400μm size.