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Non-linear thermogravimetric mass spectrometry of carbon materials providing direct speciation separation of oxygen functional groups

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Schlögl,  Robert
Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Düngen, P., Schlögl, R., & Heumann, S. (2018). Non-linear thermogravimetric mass spectrometry of carbon materials providing direct speciation separation of oxygen functional groups. Carbon, 130, 614-622. doi:10.1016/j.carbon.2018.01.047.


Cite as: http://hdl.handle.net/21.11116/0000-0000-AE52-0
Abstract
Thermogravimetric mass spectrometry (TG-MS) is an established way to analyze oxygen containing surface functional groups of carbon materials. Thermal stabilities and structures of functional groups influence their decomposition temperatures and products (CO, CO2). In this work, a non-linear procedure with isothermal steps is presented enabling a separation of functional groups by different decomposition temperatures. Nitrosulfuric acid functionalized carbon materials like multi-walled carbon nanotubes (MWCNT) and graphite were used to design the temperature program. Comparative studies of linear and non-linear heating experiments in argon and hydrogen containing atmosphere were performed to state the benefits and limits of both methods. The distinct advantage of non-linear thermal analysis is demonstrated by an application-oriented experiment where only selected functional groups are consumed.