Use of a micro-porous membrane multi-tubular fixed-bed reactor for tri-reforming of methane to syngas: CO2, H2O or O2 side-feeding

Alipour-Dehkordi, Afshar; Khademi, Mohammad Hasan

doi:10.1016/j.ijhydene.2019.10.097

Cited by 32 publications

(7 citation statements)

References 37 publications

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“…Moreover, they reported that the membrane configuration feed led to higher CO 2 conversion than the conventional tubular reactor when syngas was destined to direct dimethyl ether (DME) synthesis (H 2 /CO ∼ 1.2); on the other hand, when syngas to FT was wanted (H 2 /CO ∼ 2), CO 2 conversions obtained with the tubular reactors were higher than those observed with the membrane covered tubular reactors. 24 A previous work of our group 26 The influence of temperature on the TRM reaction was explored by Majewski and Wood, 14 who observed that the conversions of the reactants increased as the temperature was increased from 550 to 750 °C, since the endothermic SRM and DRM reactions were favored. The reverse water−gas shift reaction (Scheme 5), which is thermodynamically favored at high temperatures, could also be observed, and led to a higher concentration of CO and consumption of part of the H 2 , which implied that the H 2 /CO ratio decreased at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Optimization studies were performed by Alipour-Dehkordi and Khademi , using a multitubular reactor covered with a permeable ceramic microporous membrane in which oxygen, carbon dioxide, or water flowed through these membranes along the length of the tubular reactor. According to these researchers, such feeding configuration minimizes the formation of hot spots inside the reactor because it allows greater energy distribution, which improves process safety that is still a limiting issue to employ TRM in large-scale industrial processes.…”

Section: Introductionmentioning

confidence: 99%

“…According to these researchers, such feeding configuration minimizes the formation of hot spots inside the reactor because it allows greater energy distribution, which improves process safety that is still a limiting issue to employ TRM in large-scale industrial processes. Moreover, they reported that the membrane configuration feed led to higher CO 2 conversion than the conventional tubular reactor when syngas was destined to direct dimethyl ether (DME) synthesis (H 2 /CO ∼ 1.2); on the other hand, when syngas to FT was wanted (H 2 /CO ∼ 2), CO 2 conversions obtained with the tubular reactors were higher than those observed with the membrane covered tubular reactors …”

Section: Introductionmentioning

confidence: 99%

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Adjusting Process Variables in Methane Tri-reforming to Achieve Suitable Syngas Quality and Low Coke Deposition

Lino

Assaf

2020

Energy Fuels

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Tri-reforming of methane (TRM) combines steam reforming, dry reforming, and partial oxidation of CH 4 in a single reactor. The H 2 /CO product ratio usually ranges from 1.5 to 2.5, which makes the TRM process highly versatile, since the synthesis gas quality can be altered by simply changing the feed composition, hence permitting a wide range of applications. A H 2 /CO ratio of 2 is usually desired to produce liquid fuels such as methanol and dimethyl ether (DME). In this work, operational studies of the influence of the gas hourly space velocity (GHSV) and the feed composition were carried out, with the aim of obtaining an H 2 /CO ratio suitable for downstream processes, as well as to achieve satisfactory CO 2 conversion, which is vital for CCSU (CO 2 capture, storage, and utilization) strategies. The catalyst used for these studies was nickel supported on MgAl 2 O 4 spinels promoted with CeZrO 2 (Ce/Zr molar ratio = 4). Reaction tests were performed changing the O 2 /CO 2 and H 2 O/CO 2 molar ratios in the reactor feed, keeping the GHSV constant at 2.95 mol•g cat −1•h −1 . Each test was run for 5 h at 750 °C and atmospheric pressure. The increase of the O 2 /CO 2 molar ratio from 0 to 1.5 in the feed reduced the amount of coke by about 30-fold, while increasing the H 2 O/CO 2 molar ratio from 0 to 1.4 led to only an 8-fold decrease of carbon deposition, which showed that increasing the supply of oxygen was more effective for reducing the carbon deposition, compared to increasing the amount of water steam. The feed composition CH 4 / CO 2 /H 2 O/O 2 /N 2 = 3:1.5:1.4:0.25:1 (O 2 /CO 2 = 0.17) could be considered the most stable operational condition among those studied in this work, producing syngas with H 2 /CO ∼ 1.7 and significant CH 4 and CO 2 conversions (77 and 60%, respectively).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adjusting Process Variables in Methane Tri-reforming to Achieve Suitable Syngas Quality and Low Coke Deposition

Lino

Assaf

2020

Energy Fuels

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“…These methods include methane reforming using steam, carbon dioxide, and oxygen. Recently, research focus is shifting to the advanced form of reforming such as tri-reforming of methane, chemical looping reforming, and photocatalytic reforming [23][24][25][26][27][28]. Amongst the thermochemical processes, the steam methane reforming is the most established and presently being employed for a large proportion of global hydrogen production [17,29,30].…”

Section: Natural Gas Conversion Technologiesmentioning

confidence: 99%

An Overview of Economic Analysis and Environmental Impacts of Natural Gas Conversion Technologies

et al. 2020

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This study presents an overview of the economic analysis and environmental impact of natural gas conversion technologies. Published articles related to economic analysis and environmental impact of natural gas conversion technologies were reviewed and discussed. The economic analysis revealed that the capital and the operating expenditure of each of the conversion process is strongly dependent on the sophistication of the technical designs. The emerging technologies are yet to be economically viable compared to the well-established steam reforming process. However, appropriate design modifications could significantly reduce the operating expenditure and enhance the economic feasibility of the process. The environmental analysis revealed that emerging technologies such as carbon dioxide (CO2) reforming and the thermal decomposition of natural gas offer advantages of lower CO2 emissions and total environmental impact compared to the well-established steam reforming process. Appropriate design modifications such as steam reforming with carbon capture, storage and utilization, the use of an optimized catalyst in thermal decomposition, and the use of solar concentrators for heating instead of fossil fuel were found to significantly reduced the CO2 emissions of the processes. There was a dearth of literature on the economic analysis and environmental impact of photocatalytic and biochemical conversion processes, which calls for increased research attention that could facilitate a comparative analysis with the thermochemical processes.

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“…The retentate side is that in which the reactions take place, and the permeate side is that into which H 2 penetrates. The CH 4 conversion and H 2 yield are increased in the membrane reactor owing to hydrogen permeation from the retentate side to the permeate side through a hydrogen permselective membrane [24,[26][27][28][29]. Some studies have reported on the effect of membranes on CH 4 reforming [18,23,25,30].…”

Section: Introductionmentioning

confidence: 99%

Development of a Trireforming Fluidized‐Bed Reactor with a Hydrogen Permselective Membrane

Osat

Shojaati

2022

Chem Eng & Technol

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Three models were developed for a conventional fluidized‐bed reactor and a cocurrent and a countercurrent membrane fluidized‐bed reactor for methane trireforming. Firstly, the effects of the operating parameters on the reactor performance were assessed. Then, a single‐objective optimization was established. Finally, a membrane was added to the reactor to improve the reactor performance. The simulated results illustrate that the reaction rates are highest near the reactor entrance due to the high volume fraction of the dispersed phase and the existence of a hot zone. Moreover, the optimization process indicates that the maximum H2 yield in the conventional fluidized‐bed reactor is obtained when the inlet temperature, inlet flow rate, and H2O/CH4 ratio, are 804 °C, 3.6 × 105 L h−1, and 2.5, respectively.

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Use of a micro-porous membrane multi-tubular fixed-bed reactor for tri-reforming of methane to syngas: CO2, H2O or O2 side-feeding

Cited by 32 publications

References 37 publications

Adjusting Process Variables in Methane Tri-reforming to Achieve Suitable Syngas Quality and Low Coke Deposition

Adjusting Process Variables in Methane Tri-reforming to Achieve Suitable Syngas Quality and Low Coke Deposition

An Overview of Economic Analysis and Environmental Impacts of Natural Gas Conversion Technologies

Development of a Trireforming Fluidized‐Bed Reactor with a Hydrogen Permselective Membrane

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