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Application of Parallel Difference Tests to Resolve the Axial Activation–Deactivation Profile of Copper–Zinc Oxide Catalyst During Hydrogenation of Methyl Acetate
Topics in Catalysis ( IF 3.6 ) Pub Date : 2021-08-18 , DOI: 10.1007/s11244-021-01488-z
John Birtill 1 , Jon Deeley 2 , Craig Bailey 3
Affiliation  

The deactivation of a copper–zinc oxide catalyst has been studied in a set of parallel tests which covered a range of space-times with equal flow and variable catalyst quantity, from 1/8th bed to full bed. The activation–deactivation trends over time in different segments of the full catalyst bed have been determined by two alternative parallel difference methods. The relative trends in segmental activity over time were followed by (a) using a pre-determined reaction model, and (b) by referencing the axial conversion profile against the initial profile. The trends estimated by both methods were in broad agreement. The results show that the front segment of the catalyst bed experienced a more rapid process of deactivation than the rest of the catalyst bed. This process is consistent with the known susceptibility of this type of catalyst to deactivation by chlorine and sulfur impurities in the feedstock. The main part of the catalyst bed appeared to undergo a process of activation during the first 150 h, followed by a slow process of deactivation which was more rapid during periods at increased temperature. The slow deactivation is most likely associated with sintering of copper particles. The conversion parallel difference method provides a convenient and rapid tool for segmental analysis of parallel life tests, and is well-suited to resolving the impact of a poison front within a catalyst bed.



中文翻译:

应用平行差分试验解决乙酸甲酯加氢过程中铜-锌氧化物催化剂的轴向活化-失活曲线

已经在一组平行试验中研究了铜-锌氧化物催化剂的失活,这些试验涵盖了从 1/8 床到满床的具有相同流量和可变催化剂量的一系列时空。全催化剂床的不同部分随时间的活化-失活趋势已通过两种替代的平行差异方法确定。分段活性随时间的相对趋势随后是 (a) 使用预先确定的反应模型,和 (b) 通过参考轴向转化曲线与初始曲线。两种方法估计的趋势基本一致。结果表明,催化剂床的前段比催化剂床的其余部分经历了更快的失活​​过程。该过程与已知的此类催化剂对原料中氯和硫杂质的失活敏感性一致。在最初的 150 小时内,催化剂床的主要部分似乎经历了一个活化过程,随后是一个缓慢的失活过程,在温度升高期间更快。缓慢失活很可能与铜颗粒的烧结有关。换算平行差分法为平行寿命试验的分段分析提供了方便快捷的工具,非常适合解决催化剂床内毒物前沿的影响。随后是缓慢的失活过程,在温度升高期间会更快。缓慢失活很可能与铜颗粒的烧结有关。换算平行差分法为平行寿命试验的分段分析提供了方便快捷的工具,非常适合解决催化剂床内毒物前沿的影响。随后是缓慢的失活过程,在温度升高期间会更快。缓慢失活很可能与铜颗粒的烧结有关。换算平行差分法为平行寿命试验的分段分析提供了方便快捷的工具,非常适合解决催化剂床内毒物前沿的影响。

更新日期:2021-08-19
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