Measuring Adsorption Capacity of Supported Catalysts with a Novel Quasi‐Continuous Pulse Chemisorption Method,ChemCatChem

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Measuring Adsorption Capacity of Supported Catalysts with a Novel Quasi‐Continuous Pulse Chemisorption Method
ChemCatChem ( IF 3.8 ) Pub Date : 2020-07-10 , DOI: 10.1002/cctc.202000278
Jens Friedland ₁ , Bjarne Kreitz ₂ , Heiner Grimm ₂ , Thomas Turek ₂ , Robert Güttel ₁

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An improved pulse‐chemisorption technique is presented, which is proven to be independent of the strength of interaction between adsorptive and catalyst material. The methodology is based on the transient mass balance of the adsorptive, allowing for quantitative evaluation of the pulse‐signal obtained from the experiment. Two experimental strategies for determination of the adsorption capacity are introduced, with and without using an internal standard. The methodology is illustratively discussed based on simulation results and verified by chemisorption experiments of hydrogen and carbon dioxide on a supported nickel catalyst. In addition, temperature and dosing effects are examined and benchmarked with volumetric measurements of the adsorption capacity. The proposed mathematical evaluation method of the measured data can be applied directly to experiments performed in standard equipment for pulse‐chemisorption or in modified catalyst test rigs to measure adsorption capacity before and after reaction experiments. The technique shows potential for determination of sorption kinetics and combination with operando spectroscopy.

中文翻译：

新型连续脉冲化学吸附法测量负载型催化剂的吸附能力

提出了一种改进的脉冲化学吸附技术，该技术被证明与吸附材料和催化剂材料之间的相互作用强度无关。该方法基于吸附剂的瞬态质量平衡，可以对从实验中获得的脉冲信号进行定量评估。介绍了使用或不使用内标物测定吸附容量的两种实验策略。基于模拟结果对方法进行了说明性讨论，并通过负载型镍催化剂上的氢气和二氧化碳的化学吸附实验进行了验证。此外，还通过吸附容量的体积测量来检查温度和计量效果并确定基准。所提出的测量数据的数学评估方法可直接应用于在脉冲化学吸附标准设备中进行的实验，或在改进的催化剂测试装置中进行反应实验前后的吸附能力测量。该技术显示出测定吸附动力学的潜力，并与操作光谱法结合使用。

更新日期：2020-09-05

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