Im Jahre 2050 sollen 80 Prozent des Stroms in Deutschland aus erneuerbaren Energiequellen stammen. Wobei hier Sonne, Wind und Biomasse als die wichtigsten Energielieferanten gelten. Doch sie stehen nicht gleichmäßig zur Verfügung. Denn an wind- und sonnenreichen Tagen fällt mehr Strom an, als in die Netze eingespeist werden kann. Diese fluktuierende Verfügbarkeit ist im Rahmen der Energiewende eine der größten Herausforderungen. Doch lässt sich die Überproduktion aus Windkraft- und Photovoltaikanlagen in Energieträgern wie Wasserstoff oder Kohlenwasserstoffen chemisch speichern. So könnte die elektrische Energie zu einem späteren Zeitpunkt wieder zur Verfügung stehen. Für die Umwandlung der Energieträger in Speichermoleküle wie Methan, Kohlenwasserstoffe oder Alkohole sind Katalysatoren, elektrochemische Zellen und Reaktoren notwendig. Diese müssten in dynamischen Reaktionsbedingungen eingesetzt werden. Wie sich der Einfluss wechselhafter Gegebenheiten von außen – eben durch das Schwanken von Windstärke und Sonneneinstrahlung – auf die katalytischen Reaktionssysteme auswirkt, wurde bislang kaum betrachtet. Denn die chemischen Reaktoren wurden bis jetzt meist stationär betrieben.
„Man weiß jedoch, dass sich die Struktur fester Katalysatoren und damit ihre katalytische Wirkung mit den Reaktionsbedingungen stark ändern kann. Dies ist wissenschaftlich hochspannend“, erklärt Professor Jan-Dierk Grunwaldt von den Instituten für Technische Chemie und Polymerchemie (ITCP) sowie für Katalyseforschung und -technologie (IKFT) des KIT.
RENOMMIERTE FORSCHUNGSEINRICHTUNGEN AUS GANZ DEUTSCHLAND
Mit dem Namen „Schwerpunktprogramm 2080 – Katalysatoren und Reaktoren unter dynamischen Betriebsbedingungen für die Energiespeicherung und -wandlung (SPP 2080, DynaKat)“ ist im Februar 2019 das deutschlandweite, interdisziplinäre Forschungsprogramm der Deutschen Forschungsgemeinschaft (DFG) gestartet. Die DFG fördert das auf insgesamt sechs Jahre angelegte Schwerpunktprogramm DynaKat zunächst für drei Jahre mit 8,5 Millionen Euro.
Die Koordination obliegt als projektstärkstem Partner dem Karlsruher Institut für Technologie (KIT). Zudem sind zahlreiche weitere renommierte Forschungseinrichtungen in ganz Deutschland beteiligt. Darunter das Forschungszentrum Jülich, die TU München und mehrere Max-Planck-Institute wie das Berliner Fritz-Haber-Institut. Insgesamt zwölf große Forschungskonsortien untersuchen in interdisziplinären Verbünden grundlegende und methodische Herausforderungen des dynamischen Betriebs. Die überregionalen Forschungsprojekte untergliedern sich wiederum in 34 Teilprojekte.
DYNAMISCHE BEDINGUNGEN GRUNDLEGEND VERSTEHEN UND VERBESSERN
Die rasante Entwicklung bei spektroskopischen Methoden und im Bereich der Modellierung kombiniert mit neuen Ansätzen im Material- und Reaktordesign bieten für die Forschung exzellente Voraussetzungen. Neuere Untersuchungen belegen zudem, dass sich die Struktur fester Katalysatoren – und damit auch die katalytische Wirkung mit den Reaktionsbedingungen -, stark ändern kann. Dabei besteht zum einen das Potenzial, durch dynamischen Betrieb die Ausbeute der erwünschten Reaktionsprodukte zu erhöhen und Katalysatoren in Ruhephasen zu reaktivieren. Zum anderen müssen die nanostrukturierten Katalysatoren stabilisiert werden. Für eine effiziente Nutzbarmachung dynamischer Reaktionsbedingungen bedarf es daher eines grundlegenden Verständnisses aller beteiligten Prozesse – von der atomaren Skala des Katalysators bis hin zu dreidimensionalen Konzentrations- und Temperaturverteilungen im technischen Reaktor.
„Wir wollen Veränderungen des Materials der Katalysatoren unter dynamischen Bedingungen grundlegend verstehen und verbessern“, beschreibt Dr. Erisa Saraçi, wissenschaftliche Mitarbeiterin am IKFT das Projekt. Dafür werden alle beteiligten Prozesse untersucht, von den Vorgängen auf der atomaren Ebene des Katalysators bis zur räumlichen Verteilung der Stoffkonzentrationen und Temperaturen auf Reaktorebene. Für ein grundlegendes Verständnis der Prozesse und um neue Ansätze im Material- und Reaktordesign zu entwickeln, kommen klassische etablierte Experimente ebenso zum Einsatz wie neueste spektroskopische Methoden und Möglichkeiten der Modellierung.
Der zu erwartende Erkenntnisgewinn soll künftig den effizienten Betrieb katalytischer Systeme unter dynamischen Bedingungen ermöglichen. Das grundlegende Verständnis hierfür wird am Beispiel von Reaktionen zur Energiespeicherung und -wandlung erarbeitet und schafft die Basis für zukünftige technische Anwendungen.

Charakteristisch für alle untersuchten Systeme ist, dass die Dynamik systematisch im Zeitbereich zwischen Sekunden und Tagen von außen aufgeprägt wird. Entweder weil die aufgeprägte Dynamik nur mit großem Aufwand vermieden werden kann (z. B. schwankendes Angebot an elektrischer Energie), oder weil durch den dynamischen Betrieb begründete Vorteile für die Raum-Zeit-Ausbeuten oder Selektivitäten der katalytischen Reaktionen erwartet werden.
OFFEN FÜR NACHWUCHSWISSENSCHAFTLER UND WEITERE FORSCHUNGEN
Die Ergebnisse sind aber auch interessant für andere Bereiche wie Abgaskatalyse, Selektivoxidationen, Brennstoffzellen, Batterien oder Photokatalyse. Diese Anwendungen sind jedoch ebenso wie rein physikalisch-chemische Studien nicht Gegenstand des Forschungsprojekts. Denn das interdisziplinäre Forschungsvorhaben ist in der Technischen Chemie bzw. der Chemischen Reaktionstechnik lokalisiert und explizit offen für weitere Gebiete der Chemie, Physik oder Materialwissenschaften, die zur Thematik beitragen.
Das Einbeziehen des wissenschaftlichen Nachwuchses spielt im DFG-Schwerpunktprogramm DynaKat ebenfalls eine wichtige Rolle. So steht interessierten Studierenden und Promovierenden ein Blockkurs am KIT zum Thema „Technologien und Ressourcen für Erneuerbare Energien: Von Wind und Solar zu Chemischen Energieträgern“ offen.
„In der Forschung kommt man ohne Netzwerke und Teamarbeit nicht voran, da die einzelnen Teildisziplinen sehr komplex sind“, so Sebastian Weber, Doktorand am IKFT/ITCP. Gerade für den wissenschaftlichen Nachwuchs seien der Austausch und das Zusammenbringen unterschiedlicher Expertisen wertvoll, betonen Saraçi und Weber. „Es geht darum, Kompetenzen zu bündeln und das Themengebiet deutschlandweit voranzutreiben, um darin international führend zu werden“, so Programmkoordinator Grunwaldt.
Bild oben: Energie aus erneuerbaren Quellen speichern – das ist eine der Herausforderungen der Energiewende. ©Pascal Armbruster, KIT
Dieser Artikel erschien am 1.3.2019 in der Innovation Origins.
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