Energetic, exergetic and environmental life cycle assessment analyses as tools for optimization of hydrogen production by autothermal reforming of bioethanol

Khila, Zouhour; Baccar, Ines; Jemel, Intidhar; Houas, Ammar; Hajjaji, Noureddine

doi:10.1016/j.ijhydene.2016.07.225

Cited by 23 publications

(7 citation statements)

References 70 publications

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“…In addition to the basic scheme, a comparison was made with some processes published in the scientific literature. The FU was changed to 1 kg of hydrogen produced in the plant with 99.9 vol% purity by steam reforming (Figure 6), in agreement with other reforming studies using other raw materials for hydrogen production (Hajjaji et al, 2016(Hajjaji et al, , 2013Khila et al, 2016;Susmozas et al, 2016Susmozas et al, , 2015Susmozas et al, , 2013, thus allowing the comparison of does not consider the operation of the SOFC Battery, consequently the output stream of the system is led to a purification system: First, the WGS process removes carbon monoxide and produces a small amount of additional hydrogen. Additionally, in a COPROX reactor the remaining CO can be further reduced to CO2 in the presence of oxygen.…”

Section: Comparative Analysissupporting

confidence: 60%

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Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

Cortes

Feijoo

Chica

et al. 2019

Industrial Crops and Products

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Nowadays, there is an increasing demand for energy in the world. With an energy system still based on fossil fuels, a paradigm shifts towards clean energy production based on available renewable resources is necessary. Hydrogen is a high-quality energy carrier that can be used with great efficiency and is expected to acquire a great importance in the next generation of fuels. This study aims to analyze the potential environmental impacts associated with the steam reforming of alcoholic waste from distilleries to produce clean electricity by using the Life Cycle Assessment methodology. The main findings from this study reported that the global environmental profile is better than other alternatives more common as sanitary landfill or incineration. In terms of some impact categories as Abiotic and Ozone Depletion, Acidification and Eutrophication, steam reforming of alcoholic waste performed better profiles than other processes that produce hydrogen from diverse feedstocks.

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Section: Comparative Analysissupporting

confidence: 60%

“…SBR-H2: Steam reforming of bioethanol, including bioethanol production (Hajjaji et al, 2016). BAR-H2: Autothermal reforming of bioethanol (Khila et al, 2016).…”

Section: Comparative Analysismentioning

confidence: 99%

Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

Cortes

Feijoo

Chica

et al. 2019

Industrial Crops and Products

View full text Add to dashboard Cite

show abstract

“…Starting from these findings, Khila et al [27,28] extended the analysis giving up the solid carbon species representing the catalyst coking (which is indeed minimized for steam-to-ethanol ratios higher than 4 and reforming temperatures above 500 °C, but developing full process flow diagrams with separated WGS and methanation sections for the three options (pure SR, POX, and ATR) and With these configurations and the typical operating condition specified below, the overall material balances obtained are as follows (Table 2, [26]). These results are obtained on the basis of the thermodynamic 'atom equilibrium', only, and are therefore useful to find the maximum hydrogen yield or to represent reactors with an excess catalyst hold-up.…”

Section: T (°C)mentioning

confidence: 97%

“…Starting from these findings, Khila et al [27,28] extended the analysis giving up the solid carbon species representing the catalyst coking (which is indeed minimized for steam-to-ethanol ratios higher than 4 and reforming temperatures above 500 • C, but developing full process flow diagrams with separated WGS and methanation sections for the three options (pure SR, POX, and ATR) and analyzing the exergy inputs and outputs (see the cited reference for the details of this thermodynamic potential). Their results are synthetically reported in Table 3.…”

Section: T (°C)mentioning

confidence: 97%

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

et al. 2017

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Abstract:Process simulation represents an important tool for plant design and optimization, either applied to well established or to newly developed processes. Suitable thermodynamic packages should be selected in order to properly describe the behavior of reactors and unit operations and to precisely define phase equilibria. Moreover, a detailed and representative kinetic scheme should be available to predict correctly the dependence of the process on its main variables. This review points out some models and methods for kinetic analysis specifically applied to the simulation of catalytic processes, as a basis for process design and optimization. Attention is paid also to microkinetic modelling and to the methods based on first principles, to elucidate mechanisms and independently calculate thermodynamic and kinetic parameters. Different case studies support the discussion. At first, we have selected two basic examples from the industrial chemistry practice, e.g., ammonia and methanol synthesis, which may be described through a relatively simple reaction pathway and the relative available kinetic scheme. Then, a more complex reaction network is deeply discussed to define the conversion of bioethanol into syngas/hydrogen or into building blocks, such as ethylene. In this case, lumped kinetic schemes completely fail the description of process behavior. Thus, in this case, more detailed-e.g., microkinetic-schemes should be available to implement into the simulator. However, the correct definition of all the kinetic data when complex microkinetic mechanisms are used, often leads to unreliable, highly correlated parameters. In such cases, greater effort to independently estimate some relevant kinetic/thermodynamic data through Density Functional Theory (DFT)/ab initio methods may be helpful to improve process description.

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“…Therefore, from the perspective of this impact category, the recovery of the hydrogen from waste gas streams resulted in a completely preferable option when compared to alternative production processes, most of them with AP values above 10 g SO 2 eq. [60,61].…”

Section: Life-cycle Impact Assessment Based On Hydrogen Productionmentioning

confidence: 99%

Hydrogen Recovery from Waste Gas Streams to Feed (High-Temperature PEM) Fuel Cells: Environmental Performance under a Life-Cycle Thinking Approach

et al. 2020

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Fossil fuels are being progressively substituted by a cleaner and more environmentally friendly form of energy, where hydrogen fuel cells stand out. However, the implementation of a competitive hydrogen economy still presents several challenges related to economic costs, required infrastructures, and environmental performance. In this context, the objective of this work is to determine the environmental performance of the recovery of hydrogen from industrial waste gas streams to feed high-temperature proton exchange membrane fuel cells for stationary applications. The life-cycle assessment (LCA) analyzed alternative scenarios with different process configurations, considering as functional unit 1 kg of hydrogen produced, 1 kWh of energy obtained, and 1 kg of inlet flow. The results make the recovery of hydrogen from waste streams environmentally preferable over alternative processes like methane reforming or coal gasification. The production of the fuel cell device resulted in high contributions in the abiotic depletion potential and acidification potential, mainly due to the presence of platinum metal in the anode and cathode. The design and operation conditions that defined a more favorable scenario are the availability of a pressurized waste gas stream, the use of photovoltaic electricity, and the implementation of an energy recovery system for the residual methane stream.

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Energetic, exergetic and environmental life cycle assessment analyses as tools for optimization of hydrogen production by autothermal reforming of bioethanol

Cited by 23 publications

References 70 publications

Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

Environmental implications of biohydrogen based energy production from steam reforming of alcoholic waste

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

Hydrogen Recovery from Waste Gas Streams to Feed (High-Temperature PEM) Fuel Cells: Environmental Performance under a Life-Cycle Thinking Approach

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