Exergy analysis of the demonstration plant for co-production of hydrogen and benzene from biogas

Shudo, Yukoh; Ohkubo, Takashi; Hideshima, Yoshiaki; Akiyama, Tomohiro

doi:10.1016/j.ijhydene.2008.06.043

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…The process performance metrics (Fig. 4C) for different extraction rates (60-80%) are compared with (i) a plant based on a conventional MDA reactor, implementing downstream gas fractioning using polymeric membranes (FBR-PolyM) (20); and (ii) a plant based on a CMR employing Pd-membranes (Pd-CMR) (4). Carbon efficiency is superior for our CMR system, improving steeply with increasing extraction rates.…”

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confidence: 99%

Direct conversion of methane to aromatics in a catalytic co-ionic membrane reactor

Morejudo

Zanón

Escolástico

et al. 2016

Science

376

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Non-oxidative methane dehydroaromatization (MDA:6CH 4 ↔ C 6 H 6 + 9H 2 ) using shapeselective Mo/zeolite catalysts is a technology to exploit stranded natural gas reserves by direct conversion into transportable liquids. The reaction, however, faces two major issues: the onepass conversion/yield is limited by thermodynamics, and the catalyst deactivates fast due to the kinetically-favored formation of coke. Here we show that integration of an electrochemical BaZrO 3 -based membrane exhibiting both proton and oxide ion conductivity into an MDA reactor enables high aromatic yields and outstanding catalyst stability. These effects originate from the simultaneous extraction of hydrogen and distributed injection of oxide ions along the reactor length. Further, we demonstrate that the electrochemical co-ionic membrane reactor enables high carbon efficiencies (up to 80%) significantly improving the techno-economic process viability, and sets the ground for its commercial deployment. One Sentence Summary:The integration of a co-ionic membrane in a MDA reactor remarkably enhances aromatics yield and catalyst lifetime. Main text:

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mentioning

confidence: 99%

Direct conversion of methane to aromatics in a catalytic co-ionic membrane reactor

Morejudo

Zanón

Escolástico

et al. 2016

Science

376

242

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“…In addition to the deposited carbon, the CVI ore mainly contained prereduced iron ore, Fe3O4 as a result of indirect reduction in the CVI unit. Based on the Gibb's free energy, the oxidation of Fe3O4 into Fe2O3 would occur spontaneously in the sinter plant through reaction (12).…”

Section: Application Of Sinter Plantmentioning

confidence: 99%

“…...... (12) Using the large supply of O2 from the input air, this reaction occurred completely without any CO2 generation. The reaction heat of this reaction could act as additional energy for the combustion and agglomeration processes in the sinter plant.…”

Section: Application Of Sinter Plantmentioning

confidence: 99%

“…Exergy analysis based on the second law of thermodynamics may be the best method to assess the energy efficiency of the proposed method and to compare it with existing systems. 11,12) Therefore, an exergy analysis was performed using the developed process system diagram to evaluate the advantages of the proposed method over conventional methods. The sinter plant is the second biggest contributor of CO2 emissions after the blast furnace in the ironmaking process because of the utilization of coke breeze and coke oven gas (COG) as energy sources.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Low Grade Iron Ore (FeOOH) and Biomass Through Integrated Pyrolysis-tar Decomposition (CVI process) in Ironmaking Industry: Exergy Analysis and its Application

et al. 2015

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Effective utilization of low grade iron ore (FeOOH) and biomass represents a promising method to reduce the dependency on fossil fuels and decrease raw material costs in the ironmaking industry. A process system diagram was made and a comparison of exergy losses in conventional methods was conducted to evaluate the proposed system, integrated pyrolysis-tar decomposition over a porous ore through Chemical Vapor Infiltration (CVI) process. As the main product, the CVI ore was employed for energy storage based on carbon deposition and pre-reduced ore, Fe3O4 as a product of proposed system that consisted of three units: pyrolysis, CVI, and dehydration-separation. The exergy of CVI ore increased significantly owing to exergy recovery through tar decomposition. In the basis of 3.86%wt carbon deposition (experimental value) and producing of 1 000 kg metallic Fe, the exergy loss of the proposed system was found to decrease by about 17.6% compared to that in conventional systems by the recovery of both chemical and thermal tar exergy. The exergy loss decreased drastically to 37.0% when the expected carbon deposition was attained (10%wt). The CVI ore offered great chance to replace the coke breeze as a heat source in sinter plant. With regard to experimental value, the sinter plant could be operated without using additional coke breeze when the CVI ore content was 70% to total input ore. The total enthalpy of CVI ore consisted of the oxidation of deposited carbon and Fe3O4 in the ratio of 60.2% and 39.8%, respectively. Based on these results, the proposed system proffered effective biomass and low grade ore utilization as well as led to decrease in CO2 emissions by the ironmaking industry.

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“…Previous assessments of biogas systems concerning exergy can be classified into three groups. First is the traditional exergy model, which mainly focuses on the tradable resources in social economy [19,[26][27][28][29][30]. In these calculations, exergy of a resource mainly consists of the resource's physical and chemical exergy, and its magnitude depends on the temperature, pressure and chemical composition of both the resource and the ambient.…”

Section: Introductionmentioning

confidence: 99%

Renewability and sustainability of biogas system: Cosmic exergy based assessment for a case in China

Chen

Yang

et al. 2015

Renewable and Sustainable Energy Reviews

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Exergy analysis of the demonstration plant for co-production of hydrogen and benzene from biogas

Cited by 14 publications

References 9 publications

Direct conversion of methane to aromatics in a catalytic co-ionic membrane reactor

Direct conversion of methane to aromatics in a catalytic co-ionic membrane reactor

Utilization of Low Grade Iron Ore (FeOOH) and Biomass Through Integrated Pyrolysis-tar Decomposition (CVI process) in Ironmaking Industry: Exergy Analysis and its Application

Renewability and sustainability of biogas system: Cosmic exergy based assessment for a case in China

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