Steam methane reforming over structured reactors under concentrated solar irradiation

Çalışan, Atalay; Ogulgonen, C. Guvenc; Yılmaz, A.; Üner, Deniz; Kıncal, Serkan

doi:10.1016/j.ijhydene.2019.04.033

Cited by 19 publications

(7 citation statements)

References 65 publications

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“…Kincal et al [78] studied the possibility of performing the steam methane reforming reaction over Ni/mullite and Pd/CeO 2 /mullite catalysts by using the solar energy as power source. In particular, a parabolic mirror with a 70 cm was used; so, delivering concentrated solar flux onto a focal area of about 3 cm in diameter.…”

Section: Microstructured Catalytic Reactorsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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Hydrogen is an important raw material in chemical industries, and the steam reforming of light hydrocarbons (such as methane) is the most used process for its production. In this process, the use of a catalyst is mandatory and, if compared to precious metal-based catalysts, Ni-based catalysts assure an acceptable high activity and a lower cost. The aim of a distributed hydrogen production, for example, through an on-site type hydrogen station, is only reachable if a novel reforming system is developed, with some unique properties that are not present in the large-scale reforming system. These properties include, among the others, (i) daily startup and shutdown (DSS) operation ability, (ii) rapid response to load fluctuation, (iii) compactness of device, and (iv) excellent thermal exchange. In this sense, the catalyst has an important role. There is vast amount of information in the literature regarding the performance of catalysts in methane steam reforming. In this short review, an overview on the most recent advances in Ni based catalysts for methane steam reforming is given, also regarding the use of innovative structured catalysts.

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Section: Microstructured Catalytic Reactorsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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“…The mathematical model of heat balance is described by two equations. The equation number (8) express the heat needed to take place the reaction, while equation number (9) shows the heat which must be brought from the outside, taking into consideration that the steam methane reforming reaction is an endothermic reaction. Kinetic model of steam methane reforming process…”

Section: Mathematical Model Of Heat Balancementioning

confidence: 99%

Untitled

2019

Studia UBB Chemia

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This article presents the mathematical model of mass balance, the mathematical model at equilibrium for steam methane reforming process and the analysis of the equilibrium model for different operating conditions (T, P, Xfeed). The optimal operating conditions were established based on the analysis of the equilibrium model. It was also developed the mathematical model of heat balance, while the optimal size of catalyst granules was determined. The optimal working conditions were set by the equilibrium process' analysis, the reactor feed ratio, H2O:CH4, 3:1, the temperature in the range of 780-1140 K and the pressure of about 30 atm.

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“…Although there are many ways to produce hydrogen gas, 90% of production uses non-renewable raw materials, with natural gas being the primary raw material [9][10][11]. It is estimated that the natural gas steam reform, due to its high concentration of methane, exceeds 500,000 kg H2/day [9,12]. Steam reform consists of a highly reactive endothermic reaction of natural gas with steam.…”

Section: Introductionmentioning

confidence: 99%

“…However, increasing the temperature and the steam amount require higher costs in reactor operation and steam production, respectively. Therefore, a ratio of around 2.5-5.5 steam/methane is commonly used in refineries [9,12,13].…”

Section: Introductionmentioning

confidence: 99%

Energy Self-Sufficiency Conditions of Ethanol Autothermal Reforming: a Simulation Study

Brito

Maraes

Santos

et al. 2021

Braz. arch. biol. technol.

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Natural gas steam reforming is commonly used for hydrogen production. However, research has shown that ethanol autothermal reforming can produce cleaner hydrogen gas efficiently. Despite this, there is a lack of studies on the energy self-sufficiency conditions of the ethanol autothermal reform. In this paper, we use simulations and the Response Surface Methodology (RSM) for the multivariate analysis of the energy self-sufficiency conditions in this process. First, we constructed and validated an industrial flowchart. After that, RSM allowed us to assess the process variables effects. The process variables studied were temperature (0 to 1000 ºC), pressure (20 to 30 bar), steam/ethanol ratio (2 to 5 mol/mol) and O2/ethanol ratio (0 to 1.5 mol/mol). We observe that the temperature and steam/ethanol ratio increase have a positive effect on hydrogen production. On the contrary, the O2/ethanol ratio increase has a negative effect, and the pressure increase is not statistically significant on hydrogen production. Therefore, the pressure was used at its minimum level (20 bar) while the temperature and the steam/ethanol ratio at its maximum levels (1000 ºC and 5 mol/mol). We also evaluated the energy consumption for the Autothermal Reactor (ATR). The reactor consumed 477.92 kJ/mol ethanol to produce 5.12 mol H2/mol ethanol when we use 1000 ºC, 20 bar, steam/ethanol 5 mol/mol, and O2/ethanol 0 mol/mol. ATR's energy self-sufficiency is achieved by using 1000 ºC, 20 bar, steam/ethanol 5 mol/mol, and O2/ethanol 0.86 mol/mol. In these conditions, 3.95 mol H2/mol ethanol is produced with 0 kJ/mol ethanol. HIGHLIGHTS• Pressure is not statistically significant for ethanol autothermal reforming.• Temperature and steam/ethanol ratio have a positive effect on hydrogen production.• Autothermal Reactor can achieve energy self-sufficiency.2 Brito, M.L.; et al.

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Steam methane reforming over structured reactors under concentrated solar irradiation

Cited by 19 publications

References 65 publications

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

Untitled

Energy Self-Sufficiency Conditions of Ethanol Autothermal Reforming: a Simulation Study

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