Overcoming the Engineering Constraints for Scaling-Up the State-of-the-Art Catalyst for Tail-Gas N2O Decomposition,Industrial & Engineering Chemistry Research

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Overcoming the Engineering Constraints for Scaling-Up the State-of-the-Art Catalyst for Tail-Gas N2O Decomposition
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acs.iecr.7b04584
Ignacio Melián-Cabrera _{1,

2} , Silvia Espinosa ₃ , Cristina Mentruit ₃ , Blaine Murray _{1,

2} , Lorena Falco ₁ , Joseph Socci ₁ , Freek Kapteijn ₃ , Jacob A. Moulijn ₃

Affiliation

An efficient process is reported for preparing a state-of-the-art Fe-ferrierite catalyst for N₂O decomposition under industrial tail-gas conditions. In the synthesis procedure, we evaluate the very demanding constraints for scale-up; i.e. large reactor volumes are typically needed, and long processing times and considerable amounts of wastewater are generated. The proposed synthesis minimizes the amount of water used, and therefore, the amount of produced wastewater is minimal; in this approach there is no liquid residual water stream that would need intensive processing. This has remarkable benefits in terms of process design, since the volume of equipment is reduced and the energy-intensive filtration is eliminated. This route exemplifies the concept of process intensification, with the ambition to re-engineer an existing process to make the industrial catalyst manufacture more sustainable. The so-obtained catalyst is active, selective, and very stable under tail-gas conditions containing H₂O, NO, and O₂, together with N₂O, keeping a high conversion during 70 h time on stream at 700 K, with a decay of 0.01%/h, while the standard reference catalyst decays at 0.06%/h; hence, it deactivates 6 times more slowly, with ∼5% absolute points of higher conversion. The excellent catalytic performance is preliminarily ascribed to the differential speciation.

中文翻译：

克服扩大尾气N ₂ O分解的最先进催化剂的工程约束

据报道，一种有效的方法可以制备用于N ₂的最先进的铁镁碱沸石催化剂。在工业尾气条件下发生O分解。在综合程序中，我们评估了放大的非常苛刻的约束条件；也就是说，通常需要较大的反应器体积，并且会产生较长的处理时间和大量废水。拟议的合成方法可最大程度地减少用水量，因此产生的废水量也很少。在这种方法中，不存在需要大量处理的液态残留水流。这在工艺设计方面具有显着的优势，因为减少了设备的体积并消除了能耗大的过滤。这条路线体现了过程强化的概念，并雄心勃勃地对现有过程进行重新设计，以使工业催化剂的生产更具可持续性。如此获得的催化剂是活性的，选择性的，₂ O，NO和O ₂以及N ₂ O与700 K一起在70 h的运行时间内保持高转化率，衰减量为0.01％/ h，而标准参考催化剂的衰减量为0.06％/ h。因此，它的失活速度要慢6倍，转化率约为5％的绝对点。优异的催化性能初步归因于不同的物种。

更新日期：2018-01-16

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