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bimetal Nickel catalysts

双金属镍催化剂

基本信息

批准号：
275496690
负责人：
Privatdozent Dr.-Ing. Martin Seipenbusch
金额：
--
依托单位：
ParteQ GmbH
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/275496690?language=en
关键词：
bimetal Nickel catalysts

项目摘要

Bimetal nanoparticles have moved into the focus of science in recent years to a large part due to their interesting catalytic properties. For many economically important processes the alloying of a second metal offers the possibility to optimize activity, selectivity and long term stability.In this context, the aim of the proposed project is the testing of the hypothesis of a two-parameter optimum of alloy composition and particle size for the catalytic activity and deactivation resistance for Ni-Cu and Ni-Fe.Methanation of carbon monoxide was selected as representative test reaction, which plays an important role in a number of technical processes, such as Fischer-Tropsch- synthesis or upstream of ammonia-synthesis to protect the iron catalyst from deactivation by CO. As alloying elements Fe and Cu were selected, due to promising results in earlier studies. To reach the project goal the investigation of the initial activity and the deactivation behavior of Ni-Cu and Ni-Fe catalysts with highly defined composition and particle size are necessary. For the investigation of the catalytic properties and the deactivation behavior a number of factors of influence need to be taken into account. These are alloy composition, particle size, reaction temperature, reaction time, and gas phase composition. All three target figures, catalytic activity for the desired reaction, the kinetics of coke formation and sintering behavior, are expected to depend on these factors of influence to some extent. A reduction of the experimental matrix is therefore necessary to reduce the number of required experiment. Based on preceding work the gas phase composition of educt gases for the catalytic reaction will therefore be kept constant. The initial activity of the catalysts shall be characterized in dependence on the the Copper- and Iron-concentration in Nickel-based alloyed catalyst particles. The influence of particle size will be observed separately by investigating particles of a set composition but variable particle size. This will be accomplished by the possibility of manipulating the particle size in the spark discharge process and can further be improved by classification in the gasborne state yielding close to monodisperse particles. The loss of catalytic activity with increasing reaction time will be investigated separately for the two dominating mechanisms, particle growth and coking, which is enabled by aerosol processes. Again the parameters composition and particle size will be investigated separately in their influence on the mechanisms.

近年来，双金属纳米粒子在很大程度上由于其有趣的催化特性而成为科学的焦点。对于许多经济上重要的工艺，第二种金属的合金化提供了优化活性、选择性和长期稳定性的可能性。在这种情况下，该项目的目的是测试合金成分和颗粒尺寸的双参数最佳假设，以提高 Ni-Cu 和 Ni-Fe 的催化活性和抗失活性。选择一氧化碳甲烷化作为代表性测试反应，它发挥着重要作用在许多技术过程中，例如费托合成或氨合成上游，以保护铁催化剂免遭 CO 失活。由于早期研究的良好结果，选择 Fe 和 Cu 作为合金元素。为了实现该项目目标，有必要研究具有高度确定的成分和粒径的 Ni-Cu 和 Ni-Fe 催化剂的初始活性和失活行为。为了研究催化性能和失活行为，需要考虑许多影响因素。这些是合金成分、颗粒尺寸、反应温度、反应时间和气相成分。所有三个目标数据，即所需反应的催化活性、焦炭形成的动力学和烧结行为，预计在某种程度上取决于这些影响因素。因此，有必要减少实验矩阵以减少所需实验的数量。基于先前的工作，用于催化反应的离析气体的气相组成将因此保持恒定。催化剂的初始活性应根据镍基合金催化剂颗粒中铜和铁的浓度来表征。通过研究固定组成但不同粒径的颗粒，可以单独观察粒径的影响。这将通过在火花放电过程中操纵颗粒尺寸的可能性来实现，并且可以通过在气载状态下分类产生接近单分散的颗粒来进一步改进。随着反应时间的增加，催化活性的损失将分别针对两种主要机制进行研究：颗粒生长和焦化，这是由气溶胶过程实现的。再次，将分别研究参数组成和颗粒尺寸对机制的影响。