Energy Technology

Cover image for Vol. 1 Issue 4

April 2013

Volume 1, Issue 4

Pages 197–287

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. You have free access to this content
      Cover Picture: Mechanisms of Solid Fuel Conversion by Chemical-Looping Combustion (CLC) using Manganese Ore: Catalytic Gasification by Potassium Compounds (Energy Technol. 4/2013) (page 197)

      Martin Keller, Dr. Henrik Leion and Dr. Tobias Mattisson

      Article first published online: 18 APR 2013 | DOI: 10.1002/ente.201390006

      Thumbnail image of graphical abstract

      Chemical Looping Combustion—The Role of Potassium: The cover picture illustrates the chemical looping combustion (CLC) process using Brazilian manganese ore, for which particles containing K/Al/Si-rich inclusions were demonstrated to have great potential for the catalytic combustion of solid fuels. The mechanism of this effective solid-fuel conversion was found to rely upon the catalysis of the steam–carbon reaction by potassium as described in the Full Paper by Martin Keller and colleagues at Chalmers University of Technology on page 273. CLC is a process in which a carbonaceous fuel is combusted by using a solid oxygen carrier, and it offers the prospect of cost-efficient CO2 capture in combustion processes. (Photo credit: Denvie Balidoy)

  2. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. Graphical Abstract: Energy Technol. 4/2013 (pages 199–202)

      Article first published online: 18 APR 2013 | DOI: 10.1002/ente.201390007

  3. Forum Section

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. Forum Section (pages 206–208)

      Article first published online: 18 APR 2013 | DOI: 10.1002/ente.201305002

  4. Communications

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. Mesoporous Nitrogen-Doped Carbon-LiSICON Glass Ceramics as High Performance Cathodes in Solid-State Lithium–Oxygen Batteries (pages 209–211)

      Dr. Padmakar Kichambare and Dr. Stanley Rodrigues

      Article first published online: 18 MAR 2013 | DOI: 10.1002/ente.201200028

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      Power trip! A new composite cathode for lithium–oxygen batteries is developed by using a highly mesoporous nitrogen-doped carbon blend and 20 wt % lithium aluminum germanium phosphate. This composite exhibits excellent electrochemical activity for oxygen reduction. The lithium–oxygen cell performance is an order of magnitude higher than that of cells with cathodes fabricated by using only carbon.

    2. All-Solution-Processed Tandem Solar Cells (pages 212–216)

      Prof. Dr. Abd. Rashid bin Mohd Yusoff, Hyeong Pil Kim and Prof. Dr. Jin Jang

      Article first published online: 9 APR 2013 | DOI: 10.1002/ente.201300012

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      The F Factor: An all-solution-processed polymer tandem solar cell is fabricated that is highly efficient and demonstrates long-term stability. The open circuit voltage (Voc) of the tandem cell, which contains two cells that are connected in series, is close to the ideal situation, that is, it is almost equal to the summation of the individual Voc values of the top and bottom cells.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. Proposed Process and Design Considerations for Air Separation and CO2 Purification in a 100 MWe Oxy–Coal Power-Generation System (pages 217–225)

      Dr. Hookyung Lee, Dr. Sangmin Choi, Dr. Heungman Mun and Dr. Sangil Seo

      Article first published online: 18 MAR 2013 | DOI: 10.1002/ente.201200017

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      Airing it out: Air-separation and CO2-purification conditions differ in the general application of oxy–coal combustion-based power generation. Feasible processes and design considerations are proposed to take into account the operational stability of the overall plant. The installation and management of the system and methods to reduce power consumption in the processes are discussed.

    2. Single-Stage Biodiesel Production from Used Soybean Oil by using a Sulfuric-Acid Catalyst (pages 226–232)

      G. R. Moradi, E. Arjmandzadeh and R. Ghanei

      Article first published online: 27 MAR 2013 | DOI: 10.1002/ente.201200034

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      Optimizing biodiesel production: The esterification (stage I) and transesterification (stage II) of used soybean oil is performed in one stage by using sulfuric acid as the catalyst for both stages. By using response surface methodology, the optimum conditions are are found and a simple, second-order rate equation with is shown to accurately describe the reaction kinetics.

    3. Control Structure Design for CO2-Absorption Processes with Large Operating Ranges (pages 233–244)

      Marc-Oliver Schach, Rüdiger Schneider, Henning Schramm and Prof. Jens-Uwe Repke

      Article first published online: 10 APR 2013 | DOI: 10.1002/ente.201200057

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      Control issues: For the operation of plant-scale CO2-absorption processes, control structures are needed which allow for a flexible process and economical CO2 separation over a large range of operating conditions. In this work plantwide control structures are systematically designed using a self-optimizing control procedure. The control structures enable an economical separation at every operating point.

    4. Improving Purity and Process Volume During Direct Electrolytic Reduction of Solid SiO2 in Molten CaCl2 for the Production of Solar-Grade Silicon (pages 245–252)

      Dr. Kouji Yasuda, Prof. Toshiyuki Nohira, Dr. Katsutoshi Kobayashi , Naoya Kani, Dr. Tetsuya Tsuda  and Prof. Rika Hagiwara

      Article first published online: 9 APR 2013 | DOI: 10.1002/ente.201300001

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      Purity is a virtue: The direct electrolytic reduction of SiO2 is studied for the production of solar-grade silicon (SOG-Si) by using molten CaCl2 salt. The concentrations of most metal impurities are significantly decreased below their target concentrations by using a quartz vessel and new types of SiO2-contacting electrodes.

    5. Gasification of Low-Grade Coal in a Dual Fluidized-Bed Steam Gasifier (pages 253–264)

      Stefan Kern, Dr. Christoph Pfeifer and Prof. Dr. Hermann Hofbauer

      Article first published online: 5 APR 2013 | DOI: 10.1002/ente.201300009

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      High-ash fuel to gas: The gasification of bituminous coal is performed in a dual fluidized-bed (DFB) steam gasifier at a fuel power of 90 kWth. Our tests prove the suitability of the DFB system for cheap low-grade coals that are often delivered with a wide range of particle sizes and ash loads. The DFB steam-gasification process is distinguished by the flexibility of the use of the product gas generated in the process.

    6. Fully Organic Nanocomposites with High Thermoelectric Power Factors by using a Dual-Stabilizer Preparation (pages 265–272)

      Gregory P. Moriarty, Kenneth Briggs, Bart Stevens, Prof. Dr. Choongho Yu and Prof. Dr. Jaime C. Grunlan

      Article first published online: 5 APR 2013 | DOI: 10.1002/ente.201300018

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      Organic matters: The thermopower and electrical conductivity of segregated-network polymer composites are simultaneously increased by using a combination of intrinsically conducting and semiconducting stabilizers for carbon nanotubes. These improved properties are directly linked to improved thermoelectric efficiency.

    7. Mechanisms of Solid Fuel Conversion by Chemical-Looping Combustion (CLC) using Manganese Ore: Catalytic Gasification by Potassium Compounds (pages 273–282)

      Martin Keller, Dr. Henrik Leion and Dr. Tobias Mattisson

      Article first published online: 20 MAR 2013 | DOI: 10.1002/ente.201200052

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      Throwing combustion for a loop: This work explores the enhanced fuel conversion observed using manganese ore as an oxygen carrier in chemical-looping combustion. It is experimentally demonstrated that potassium introduced to the reactor system by the oxygen carrier is transferred to the fuel particles, which results in an increased rate of char conversion.

    8. Transparent Graphene Electrodes for Highly Efficient III–V Multijunction Concentrator Solar Cells (pages 283–286)

      Jieun Chang, Myoung-Gyun Suh, Dr. Jinseong Heo, Dr. Dongho Kim, Joosung Kim, Sang-Moon Lee, Dr. Hyun-Jong Chung and Yungi Kim

      Article first published online: 5 APR 2013 | DOI: 10.1002/ente.201200039

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      Making contact: Transparent graphene electrodes in concentrator solar cells lead to a reduction in the resistive power loss at high irradiance levels. The efficiency increases by 13.8 % owing to the decrease in the series resistance, and the reduced series resistance allows the cells to operate at higher concentration ratios and leads to the higher performance and lower cost of the cells.

  6. Book Review

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Forum Section
    5. Communications
    6. Full Papers
    7. Book Review
    1. Second Generation of Biofuels and Biomass. Roland A. Jansen (page 287)

      Prof. Dr. Mark Mba Wright

      Article first published online: 18 APR 2013 | DOI: 10.1002/ente.201305003

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      Wiley-VCH, Weinheim 2013. 253 pp., € 69.90—ISBN 978-3-537-33290-8

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