Influence of catalysts on the pyrolysis of lignites

Seitz, Mathias; Heschel, Wolfgang; Nägler, Thomas; Nowak, Sascha; Zimmermann, Jens; Stam‐Creutz, Timo; Frank, Willy; Appelt, Jörn; Bieling, S.; Meyer, Bernd

doi:10.1016/j.fuel.2014.05.042

Cited by 27 publications

(16 citation statements)

References 18 publications

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“…Different ranking coals with different chemical compositions and physical properties result in different ways in usage. [29][30][31][32] Bituminous coals with a carbon content of around 75-90 wt% are primarily used in coking process for the production of metallurgical coke. 3, low-rank coals, such as brown coal, non-caking coal and long flame coal is rich in volatiles and contains high-valued chemical structures that generally are converted by pyrolysis upgrading technology to obtain coal-tar oil, char and fuel gas products.…”

Section: Energy Use and Co 2 Emission In Current Coal Chemical Enginementioning

confidence: 99%

Carbon cycle in advanced coal chemical engineering

Xie

2015

Chem. Soc. Rev.

157

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This review summarizes how the carbon cycle occurs and how to reduce CO2 emissions in highly efficient carbon utilization from the most abundant carbon source, coal. Nowadays, more and more attention has been paid to CO2 emissions and its myriad of sources. Much research has been undertaken on fossil energy and renewable energy and current existing problems, challenges and opportunities in controlling and reducing CO2 emission with technologies of CO2 capture, utilization, and storage. The coal chemical industry is a crucial area in the (CO2 value chain) Carbon Cycle. The realization of clean and effective conversion of coal resources, improving the utilization and efficiency of resources, whilst reducing CO2 emissions is a key area for further development and investigation by the coal chemical industry. Under a weak carbon mitigation policy, the value and price of products from coal conversion are suggested in the carbon cycle.

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Section: Energy Use and Co 2 Emission In Current Coal Chemical Enginementioning

confidence: 99%

Carbon cycle in advanced coal chemical engineering

Xie

2015

Chem. Soc. Rev.

157

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“…The interaction between the coal structure and the catalyst in the pyrolysis process is vital for the development of new catalytic pyrolysis technology and the design of high efficiency catalyst. Many researchers have tried to obtain the catalytic mechanism with various apparatus [10,11]. Nonetheless, no defined interpretation has been established because of the complex composition of coal, as well as the multiple reactions in the pyrolysis process.…”

Section: Introductionmentioning

confidence: 99%

Study on the Catalytic Pyrolysis Mechanism of Lignite by Using Extracts as Model Compounds

et al. 2019

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Understanding the catalytic pyrolysis mechanism of lignite is of great significance for obtaining a high yield of the target products or designing high-efficiency catalysts, which are generally derived by using simple model compounds, while the ordinary model compounds cannot represent the real atmosphere of lignite pyrolysis owing to the simple structures and single reactions. Based on the coal two-phase model, the extractable compounds are the important compositions of coal, which can reflect the partial characteristics of raw coal while obtaining a high extraction yield. Hence, a better understanding of the interaction between the coal structure and catalyst can be inferred by using a mobile phase in coal as model compounds instead of conventional simple compounds. In this work, tetrahydrofuran extracts of lignite were chosen as model compounds to study the catalytic pyrolysis mechanism with separate addition of Fe(NO3)3 and FeCl3 by using a thermogravimetric combined with mass spectrometry. It was found that about 77.88% of the extracts were vaporized before 700 °C, and the residual yield was 22.12%. With the separate addition of 5 wt % of Fe(NO3)3 and FeCl3, the conversion of the extracts increased to 84.38% and 89.66%. Meanwhile, the final temperature decreased to 650 and 550 °C, respectively. The addition of Fe(NO3)3 and FeCl3 promoted the breakage of aliphatic chains at approximately 150 °C, leading to the generation of CH4 and H2 in the temperature range 100–200 °C, which were nearly invisible for that without catalyst. The addition of iron-based catalysts allowed more CO2 formation at approximately 200 °C since they enabled efficient promotion of the cleavage of carboxyl functionals at lower temperatures. The enlarged peak of H2O and CH4 at approximately 500 °C means that iron-based catalysts are significant for the cleavage of methoxy groups in the catalytic respect. Aromatic side chains facilitated cracking at approximately 500 °C, leading to more light aliphatics and aromatics generation in this temperature range.

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“…B. mehr als verdreifacht werden. Durch die katalytische Spaltung entstehen damit anstelle von Teer vermehrt Propen, Butene, Aromaten und Pyrolysekoks , . Gelingt es ein Modell für diesen Prozess zu entwickeln, so können die Betriebsparameter rohstoffspezifisch auf eine optimale Zielproduktausbeute abgestimmt werden.…”

Section: Introductionunclassified

“…Gelingt es ein Modell für diesen Prozess zu entwickeln, so können die Betriebsparameter rohstoffspezifisch auf eine optimale Zielproduktausbeute abgestimmt werden. Als Modellvorstellung wurde bereits ein Schema postuliert, das auf der beobachteten Notwendigkeit eines erneuerten Katalysatorkontakts mit dem Feststoff beruht . Es müssen alle wesentlichen Einflussgrößen berücksichtigt werden, um ein aussagekräftiges Modell zu entwickeln.…”

Section: Introductionunclassified

“…B. mehr als verdreifacht werden. Durch die katalytische Spaltung entstehen damit anstelle von Teer vermehrt Propen, Butene, Aromaten und Pyrolysekoks [9,10] Stofftransporteffekte wurden in dieser Arbeit zunächst nicht berücksichtigt, so dass es sich um ein effektivkinetisches Modell handelt. Untersuchungen zeigen jedoch, dass die in der Kohle enthaltenen Kohlenwasserstoffe mit über 28 Kohlenstoffatomen kaum in die Porenstruktur der verwendeten Katalysatoren eindringen können.…”

Section: Introductionunclassified

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Prediction of Product Yields for Different Reactor Types in Catalytic Pyrolysis

Engelhardt

Stam‐Creutz

Hahn

et al. 2018

Chemie Ingenieur Technik

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Für den Wandel hin zu einer postfossilen Gesellschaft werden rohstoffvariable Verfahren wie die katalytische Pyrolyse von festen Kohlenwasserstoffen benötigt. Zur Vorhersage der Produktausbeute aus unterschiedlichen Einsatzstoffen wurden Modellansätze entwickelt, die Rohstoffqualität, Katalysatoreigenschaften und Prozessbedingungen berücksichtigen. Eine gute Beschreibung für die stoffliche Nutzung von Braunkohle ist mit wenigen Einflussgrößen und signifikanten Modellparametern möglich. Perspektivisch sollen solche Modelle auf die Spaltung polyolefinischer Rezyklate und fettreiche Biomassen übertragen werden.

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Influence of catalysts on the pyrolysis of lignites

Cited by 27 publications

References 18 publications

Carbon cycle in advanced coal chemical engineering

Carbon cycle in advanced coal chemical engineering

Study on the Catalytic Pyrolysis Mechanism of Lignite by Using Extracts as Model Compounds

Prediction of Product Yields for Different Reactor Types in Catalytic Pyrolysis

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