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Featured researches published by Andrés Anca-Couce.


Journal of Agricultural and Food Chemistry | 2014

Surface Properties and Chemical Composition of Corncob and Miscanthus Biochars: Effects of Production Temperature and Method

Alice Budai; Liang Wang; Morten Grønli; Line Tau Strand; Michael Jerry Antal; Samuel Abiven; Alba Dieguez-Alonso; Andrés Anca-Couce; Daniel P. Rasse

Biochar properties vary, and characterization of biochars is necessary for assessing their potential to sequester carbon and improve soil functions. This study aimed at assessing key surface properties of agronomic relevance for products from slow pyrolysis at 250-800 °C, hydrothermal carbonization (HTC), and flash carbonization. The study further aimed at relating surface properties to current characterization indicators. The results suggest that biochar chemical composition can be inferred from volatile matter (VM) and is consistent for corncob and miscanthus feedstocks and for the three tested production methods. High surface area was reached within a narrow temperature range around 600 °C, whereas cation exchange capacity (CEC) peaked at lower temperatures. CEC and pH values of HTC chars differed from those of slow pyrolysis biochars. Neither CEC nor surface area correlated well with VM or atomic ratios. These results suggest that VM and atomic ratios H/C and O/C are good indicators of the degree of carbonization but poor predictors of the agronomic properties of biochar.


Gcb Bioenergy | 2018

Pyrogenic carbon capture and storage

Hans-Peter Schmidt; Andrés Anca-Couce; Nikolas Hagemann; Constanze Werner; Dieter Gerten; Wolfgang Lucht; Claudia Kammann

The growth of biomass is considered the most efficient method currently available to extract carbon dioxide from the atmosphere. However, biomass carbon is easily degraded by microorganisms releasing it in the form of greenhouse gases back to the atmosphere. If biomass is pyrolyzed, the organic carbon is converted into solid (biochar), liquid (bio‐oil), and gaseous (permanent pyrogas) carbonaceous products. During the last decade, biochar has been discussed as a promising option to improve soil fertility and sequester carbon, although the carbon efficiency of the thermal conversion of biomass into biochar is in the range of 30%–50% only. So far, the liquid and gaseous pyrolysis products were mainly considered for combustion, though they can equally be processed into recalcitrant forms suitable for carbon sequestration. In this review, we show that pyrolytic carbon capture and storage (PyCCS) can aspire for carbon sequestration efficiencies of >70%, which is shown to be an important threshold to allow PyCCS to become a relevant negative emission technology. Prolonged residence times of pyrogenic carbon can be generated (a) within the terrestrial biosphere including the agricultural use of biochar; (b) within advanced bio‐based materials as long as they are not oxidized (biochar, bio‐oil); and (c) within suitable geological deposits (bio‐oil and CO2 from permanent pyrogas oxidation). While pathway (c) would need major carbon taxes or similar governmental incentives to become a realistic option, pathways (a) and (b) create added economic value and could at least partly be implemented without other financial incentives. Pyrolysis technology is already well established, biochar sequestration and bio‐oil sequestration in soils, respectively biomaterials, do not present ecological hazards, and global scale‐up appears feasible within a time frame of 10–30 years. Thus, PyCCS could evolve into a decisive tool for global carbon governance, serving climate change mitigation and the sustainable development goals simultaneously.


Progress in Energy and Combustion Science | 2016

Reaction mechanisms and multi-scale modelling of lignocellulosic biomass pyrolysis

Andrés Anca-Couce


Combustion and Flame | 2012

Smouldering of pine wood: Kinetics and reaction heats

Andrés Anca-Couce; Nico Zobel; Anka Berger; Frank Behrendt


Energy Conversion and Management | 2014

Kinetic scheme of biomass pyrolysis considering secondary charring reactions

Andrés Anca-Couce; Ramin Mehrabian; Robert Scharler; Ingwald Obernberger


Fuel | 2016

Application of a detailed biomass pyrolysis kinetic scheme to hardwood and softwood torrefaction

Andrés Anca-Couce; Ingwald Obernberger


Fuel | 2013

Multi-scale modeling of fixed-bed thermo-chemical processes of biomass with the representative particle model: Application to pyrolysis

Andrés Anca-Couce; Nico Zobel; Hugo A. Jakobsen


Fuel | 2012

Numerical analysis of a biomass pyrolysis particle model: Solution method optimized for the coupling to reactor models

Andrés Anca-Couce; Nico Zobel


Biomass & Bioenergy | 2017

Pyrolysis of pellets made with biomass and glycerol: Kinetic analysis and evolved gas analysis

Pietro Bartocci; Andrés Anca-Couce; K Slopiecka; S Nefkens; Nikola Evic; Stefan Retschitzegger; Marco Barbanera; Cinzia Buratti; Franco Cotana; Gianni Bidini; Francesco Fantozzi


Journal of Analytical and Applied Pyrolysis | 2013

On-line tar characterization from pyrolysis of wood particles in a technical-scale fixed-bed reactor by applying Laser-Induced Fluorescence (LIF)

Alba Dieguez-Alonso; Andrés Anca-Couce; Nico Zobel

Collaboration


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Robert Scharler

Graz University of Technology

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Alba Dieguez-Alonso

Technical University of Berlin

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Frank Behrendt

Technical University of Berlin

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Ramin Mehrabian

Graz University of Technology

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Ali Shiehnejadhesar

Graz University of Technology

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Ingwald Obernberger

Graz University of Technology

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Christoph Hochenauer

Graz University of Technology

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Anka Berger

Bundesanstalt für Materialforschung und -prüfung

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