Olaf Klepel

Brandenburg University of Technology Cottbus-Senftenberg

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Arnd Garsuch

BASF (Germany)

B. Hunger

Berlin Heart (Germany)

Stephan Utgenannt

Brandenburg University of Technology Cottbus-Senftenberg

Marcel Erlitz

Brandenburg University of Technology Cottbus-Senftenberg

Michael Taubert

Brandenburg University of Technology Cottbus-Senftenberg

Piotr Kuśtrowski

Jagiellonian University

Nina Danneberg

Brandenburg University of Technology Cottbus-Senftenberg

Harvey Arellano-Garćıa

Brandenburg University of Technology Cottbus-Senftenberg

Kerstin Böhme

Leipzig University

Christine E. A. Kirschhock

KU Leuven

Cooperative Institutions

Leipzig University

Brandenburg University of Technology Cottbus-Senftenberg

Centre National de la Recherche Scientifique

Dalhousie University

TU Dresden

St Petersburg University

Institute of Chemical Technology

Martin Luther University Halle-Wittenberg

Frankfurt University of Applied Sciences

University of Stuttgart

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A new route to syngas-combined conversion of carbon dioxide and ethane on zeolites

Studies in surface science and catalysis (1997)

F. Roessner Olaf Klepel Anke Hagen

Aromatization

Carbon fibers

10.1016/s0167-2991(97)80384-9

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Citations (6)

Carbon Replicas of Porous Concrete Obtained by Chemical Vapor Deposition—Some Aspects of the Synthesis Mechanism

Materials Sciences and Applications (2017)

Olaf Klepel Nina Danneberg Matthias Suckow Marcel Erlitz

In this contribution, the template assisted synthesis of porous carbons by chemical vapor deposition in porous concrete templates has been described for the first time. Porous concrete made templates can be obtained in almost any geometrical shape and are therefore attractive templates to prepare porous carbon monoliths. The carbon deposition process in porous concrete follows a three-stage-course consisting in an initial period, a period of fast carbon deposition and a period of slow carbon deposition. The carbon growth within the template pores occurs obviously plug-like from the inner to the outer sphere. Any continuous covering of the template pore walls by carbon could not be observed. In difference to porous concrete, the carbon deposition in silica gel is strongly accompanied by mass transfer limitations. For porous concrete, such strong effect has not been observed obviously due to its hierarchical pore system. The template materials have been loaded with carbon by chemical vapor deposition in a flow reactor. The process of the template pore filling has been characterized by the time dependence of the template mass gain. The materials have been characterized by means of X-ray tomography and nitrogen adsorption at 77 K, respectively.

Carbon fibers

Template

Deposition

Pervious concrete

Template method pattern

10.4236/msa.2017.88043

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Citations (2)

Adsorption of pyrrole derivatives in alkali metal cation-exchanged faujasites: comparative studies by surface vibrational techniques, X-ray diffraction and temperature-programmed desorption augmented with theoretical studies Part I. Pyrrole as probe molecule

Physical Chemistry Chemical Physics (1999)

H. Förster H. Fueß Ekkehard Geidel B. Hunger H. Jobic

The nature and strength of interaction of pyrrole adsorbed in alkali metal cation-exchanged faujasites have been investigated by the combined use of different surface vibrational techniques, X-ray diffraction and temperature-programmed desorption accompanied by theoretical studies. The results obtained depend on the kind of cation, the degree of ion exchange and the Si/Al ratio of the zeolites, indicating that the effective strength of interaction depends on both the Lewis acidic properties of the extraframework cations and the Lewis basic properties of the lattice oxygen atoms. It was found that pyrrole is adsorbed due to these two different kinds of interactions which occur parallel and influence each other: pyrrole is bound via the NH group to the lattice oxygen atoms by hydrogen bonding and, simultaneously, via the aromatic system to the cations, yielding strong host–guest interactions. The experimentally obtained results were verified by quantum mechanical calculations and force field simulations.

Pyrrole

Thermal desorption spectroscopy

10.1039/a807296e

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Citations (46)

Templated Ru/Se/C electrocatalysts for oxygen reduction

Electrochimica Acta (2008)

Arnd Garsuch Xavier Michaud G. Wagner Olaf Klepel J. R. Dahn

Physisorption

Rotating disk electrode

Rotating ring-disk electrode

10.1016/j.electacta.2008.09.018

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Citations (28)

Are Ni/ and Ni5Fe1/biochar catalysts suitable for synthetic natural gas production? A comparison with γ-Al2O3 supported catalysts

Green Energy & Environment (2021)

Miriam González‐Castaño Carlos Morales Juan Carlos Navarro de Miguel Jens-H. Boelte Olaf Klepel

Among challenges implicit in the transition to the post–fossil fuel energetic model, the finite amount of resources available for the technological implementation of CO2 revalorizing processes arises as a central issue. The development of fully renewable catalytic systems with easier metal recovery strategies would promote the viability and sustainability of synthetic natural gas production circular routes. Taking Ni and NiFe catalysts supported over γ-Al2O3 oxide as reference materials, this work evaluates the potentiality of Ni and NiFe supported biochar catalysts for CO2 methanation. The development of competitive biochar catalysts was found dependent on the creation of basic sites on the catalyst surface. Displaying lower Turn Over Frequencies than Ni/Al catalyst, the absence of basic sites achieved over Ni/C catalyst was related to the depleted catalyst performances. For NiFe catalysts, analogous Ni5Fe1 alloys were constituted over both alumina and biochar supports. The highest specific activity of the catalyst series, exhibited by the NiFe/C catalyst, was related to the development of surface basic sites along with weaker NiFe–C interactions, which resulted in increased Ni0:NiO surface populations under reaction conditions. In summary, the present work establishes biochar supports as a competitive material to consider within the future low-carbon energetic panorama.

Methanation

Non-blocking I/O

Substitute natural gas

Carbon fibers

10.1016/j.gee.2021.05.007

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Citations (12)

Partially embedded highly dispersed Pt nanoparticles in mesoporous carbon with enhanced leaching stability

Carbon (2010)

Kerstin Scholz Jan Scholz A. James McQuillan G. Wagner Olaf Klepel

Platinum nanoparticles

Carbon fibers

10.1016/j.carbon.2010.01.021

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Citations (23)

Poröses Kohlenstoffmaterial zur Immobilisierung von Lipase – Vergleichende Messungen mit Methacryl‐Beads

Chemie Ingenieur Technik (2016)

Susann Barig Stephan Utgenannt A. Heine Christina Reichardt Olaf Klepel

10.1002/cite.201650198

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Citations (1)

Template assisted synthesis of porous carbons revisited – Where does the porosity come from?

Microporous and Mesoporous Materials (2015)

Olaf Klepel Marcel Erlitz Arnd Garsuch Kerstin Scholz M. Suckow

10.1016/j.micromeso.2015.11.047

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Citations (7)

Porous Carbon Monoliths Made from Cellulose and Starch

C – Journal of Carbon Research (2020)

Olaf Klepel Nina Danneberg

Porous carbon monoliths can be used as key components in a variety of applications, such as energy storage, adsorption and catalysis. The preparation of porous carbon monoliths suffers from several limitations, e.g., time-consuming synthesis steps, the use of hazardous chemicals, limited porosity or mechanical stability. This paper describes the investigation of a simple synthesis route to produce porous carbon monoliths from sustainable carbon precursors. Mixtures from different kinds of cellulose and starch, respectively, have been used as the carbon precursor. Fundamental features of porous monoliths, i.e., the porosity and the mechanic stability, respectively, have been investigated in dependence on the composition of the precursor mixtures. First attempts to explain the observed behavior have already been made.

Carbon fibers

Monolith

10.3390/c6020032

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Citations (4)

Oxidation of Sulfurous Acid on Carbon Catalysts as a Test Reaction Revisited: Potential and Limitations

Chemical Engineering & Technology (2018)

Olaf Klepel F. F. Lange Stephan Utgenannt

Abstract Some decades ago, the oxidation of sulfurous acid in aqueous solution was described as a probe reaction to characterize carbon‐based catalysts in redox reactions. Since then, the importance of porous carbon materials in the redox catalysis increased enormously because of the new challenges in developing energy‐saving alternatives to industrial catalyst systems or catalysts for energy conversion applications. Therefore, there is an growing interest in rapid and reliable tools to characterize such catalysts. However, the use of oxidation of sulfurous acid as a test reaction fell appearently into oblivion. The aim of the present article is to evaluate its potential and limitations and to suggest improvements.

Carbon fibers

10.1002/ceat.201800227

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Citations (2)