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Egg-shell membrane reactors for nitrite hydrogenation: Manipulating kinetics and selectivity
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-10-27 , DOI: 10.1016/j.apcatb.2017.10.058
Roger Brunet Espinosa , Damon Rafieian , Rolf Sybren Postma , Rob G.H. Lammertink , Leon Lefferts

A method to fabricate catalytic membrane contactor reactors with a Pd-egg-shell distribution has been developed on α-alumina tubes, allowing excellent control over the distribution of the active phase through the wall of the alumina tube. The performance of these catalytic membrane reactors has been assessed for nitrite hydrogenation. We have shown that manipulation of the thickness of the zone containing active phase induces different diffusion lengths for nitrite and hydrogen, strongly influencing activity and selectivity. Thick active layers have proved to be more selective to nitrogen, the desired product for purification of drinking water. Surprisingly, a thick layer with active phase also induced a negative apparent order in hydrogen, which is tentatively assigned to the fact that the ratio of concentrations of reactants, hydrogen and nitrite, varies extremely in the active zone.



中文翻译:

用于亚硝酸盐加氢的蛋壳膜反应器:操纵动力学和选择性

已经开发了一种在α-氧化铝管上制造具有Pd-蛋壳分布的催化膜接触器反应器的方法,从而可以很好地控制通过氧化铝管壁的活性相的分布。这些催化膜反应器的性能已针对亚硝酸盐氢化进行了评估。我们已经表明,操纵包含活性相的区域的厚度会引起亚硝酸盐和氢的不同扩散长度,从而强烈影响活性和选择性。事实证明,较厚的活性层对氮气具有更高的选择性,而氮气是净化饮用水的理想产品。出乎意料的是,具有活性相的厚层还会在氢中引起负的表观顺序,这暂时归因于以下事实:反应物的浓度比,

更新日期:2017-10-27
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