Evolution of the pore structure-transport relationship during catalyst reduction and sintering studied by integrated multi-scale porosimetry and multi-modal imaging
Evolution of the pore structure-transport relationship during catalyst reduction and sintering studied by integrated multi-scale porosimetry and multi-modal imaging
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DOI：
10.1016/j.ces.2023.118880
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发表时间：
2023-05
影响因子：
4.7
通讯作者：
Suleiman Mousa;V. Novák;R. Fletcher;G. Kelly;Mónica García;N. Macleod;C. Parmenter;S. Rigby
中科院分区：
文献类型：
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作者：
Suleiman Mousa;V. Novák;R. Fletcher;G. Kelly;Mónica García;N. Macleod;C. Parmenter;S. Rigby
催化剂颗粒的制造参数对最终产品的性能有重要影响。片状颗粒是复杂的分层结构，在后续处理过程中在不同级别上以不同方式演变。多尺度孔隙度测量和多模式成像结合在一起可以涵盖所有涉及的长度尺度，因此，可以全面描述催化剂还原和烧结过程中不断演变的颗粒结构。随机孔键网络模型突出了决定传质的关键颗粒结构特征，从而预测了还原和老化催化剂对空隙的可控修饰对传质的影响。还原和烧结产生的特殊大气孔率是导致传质过程与其孔体积分数不成比例的关键。X射线层析成像和渗流模型相结合的结果表明，还原和烧结导致了(与新鲜状态相比)初始球团制造参数的变化，该参数控制着辊压成球过程中的传质过程。
Catalyst pellet fabrication parameters significantly impact final product performance. Tabletted pellets are complex, hierarchical structures that evolve differently over various levels during subsequent processing. Multi-scale porosimetry and multi-modal imaging can, together, encompass all length-scales involved, and, therefore, fully characterise the evolving pellet structure during catalyst reduction and sintering. A random pore-bond network model has highlighted the key pellet structural features determining mass transport, and, thence, was predictive of the impact on mass transfer of controlled modifications to the void space for reduced and aged catalysts. Particular macroporosity, newly induced by reduction and sintering, was critical to mass transport out of proportion to its pore volume fraction. Combined X-ray tomography imaging and percolation modelling showed that reduction and sintering leads to a change (compared to the fresh state) in the initial pellet fabrication parameter that controls mass transport in pellets formed with roll-compacted feed.