Microchannel Autothermal Reforming of Methane to Synthesis Gas

Karakaya, Mustafa; Önsan, Z. İlsen; Avcı, Ahmet K.

doi:10.1007/s11244-013-0107-1

Cited by 13 publications

(8 citation statements)

References 37 publications

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“…First, a FeCrAlY sheet of 2 × 10 –3 m (height) × 1 × 10 –1 m (width) × 1 × 10 –1 m (depth) (Goodfellow Cambridge Limited) is cut into 2 × 10 –3 m (height) × 5 × 10 –3 m (width) × 2 × 10 –2 m (depth) plates by using wire electro discharge machining technique. The prepared plates are then calcined in a muffle furnace at 900 °C for 2 h to generate a native Al 2 O 3 layer which is reported to enhance adhesion and improve the coating quality. ,, In order to prepare the catalyst coatings, the previously calcined 3-μm δ-Al 2 O 3 supported catalyst powders are mixed with deionized water at a water-to-powder weight ratio of 5–8:1. The resulting slurries are blade-coated carefully onto the 5 × 10 –3 m × 2 × 10 –2 m plates and are dried at 120 °C overnight.…”

Section: Methodsmentioning

confidence: 99%

“…The operation of microchannel reactors using cocurrent and countercurrent flow was compared, and the latter one was shown to be advantageous in terms of methane conversion and CO selectivity. Karakaya et al tested methane OSR in a microchannel reactor composed of Pt- and Rh-based catalysts that were coated on the opposite walls of the channel and compared the performance of this configuration with a bimetallic Pt–Rh coated microchannel. The results showed that the latter improved methane conversion up to 20% and CO selectivity up to 33%.…”

Section: Introductionmentioning

confidence: 99%

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Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Sen

Avcı

2013

Ind. Eng. Chem. Res.

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Oxidative steam reforming (OSR) of methane is investigated under exhaust gas reforming conditions in a wallcoated catalytic microchannel reactor. The process is run over different combinations of Pt-and Rh-based catalysts, namely 0.2% (by weightIn each combination, coated catalysts are locked on the opposite walls of a rectangular microchannel to face each other. Parametric study is conducted in order to observe the effects of feed compositions (molar steam-to-carbon (H 2 O/C) and oxygen-to-carbon (O 2 /C) ratios) and temperature on methane conversion and on product distribution. The results show that methane conversion is enhanced with the increase in temperature and in the amounts of O 2 and H 2 O in the feed stream. When the temperature is raised from 600 to 700 °C, methane conversion is found to improve by ca. 25% in all catalyst configurations. Increasing H 2 O/C and O 2 /C ratios improved methane conversion at most by 7% and by 23%, respectively. H 2 production also increased with temperature, with the highest increase of 5% is observed over the 2%Rh/Al 2 O 3 −2%Rh/Al 2 O 3 combination. Higher O 2 /C ratios improved the extent of methane total oxidation but decreased H 2 production. The catalyst combination involving 2% Rh/Al 2 O 3 coated oppositely onto the inner walls of the microchannel is found to exhibit the best performance in terms of methane conversion and H 2 and CO amounts in the product stream. A 10% increase in methane conversion is observed either by changing the Pt content from 0.2% to 2% or by replacing 2%Pt with 2%Rh. The results show that Rh is superior to Pt in terms of oxidation and steam reforming activities.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Sen

Avcı

2013

Ind. Eng. Chem. Res.

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“…The inert substrates have various shapes such as tubes, [1][2][3] plates, [4][5][6] honeycombs, [7][8][9] and foams, [5,[10][11][12] among others. In addition, the coating methods used to deposit thin films on substrates, such as washcoating, [8,13,14] sol-gel deposition, [2,15,16] electrophoretic deposition, [17,18] chemical vapour deposition (CVD), [5,19,20] powder plasma spraying, [21][22][23] and physical vapour deposition (PVD), [24][25][26] among others, are diverse. The most used coating materials are metallic oxides like Al 2 O 3 , Al 2 O 3 modified with La 2 O 3 or CeO 2 , ZnO, TiO 2 , CuO, SiO 2 , ZrO 2 , and other materials.…”

Section: Introductionmentioning

confidence: 99%

“…These materials were applied in rapid reactions at high temperatures to avoid both the formation of residual compounds derived from the reaction of the products and the formation of hot spots on the catalyst that change the structure of the metallic phase. The inert substrates have various shapes such as tubes, [1][2][3] plates, [4][5][6] honeycombs, [7][8][9] and foams, [5,[10][11][12] among others. In addition, the coating methods used to deposit thin films on substrates, such as washcoating, [8,13,14] sol-gel deposition, [2,15,16] electrophoretic deposition, [17,18] chemical vapour deposition (CVD), [5,19,20] powder plasma spraying, [21][22][23] and physical vapour deposition (PVD), [24][25][26] among others, are diverse.…”

Section: Introductionmentioning

confidence: 99%

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

2022

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In order to determine the catalytic stability, PtSn structured catalysts supported on thin films of MgAl 2 O 4 or ZnAl 2 O 4 deposited on α-Al 2 O 3 spheres were studied through five reaction-regeneration cycles in the n-butane dehydrogenation. Bimetallic catalysts show good catalytic stability along the five reaction-regeneration cycles. Among the different synthesized catalysts, the PtSn/Sp-Zn-CN catalyst showed the best catalytic behaviour, showing very good values of yields to butenes and excellent catalytic stability along the cycles, even better than the one of a structured commercial catalyst used industrially for the dehydrogenation of paraffins. The characterization results by temperature-programmed reduction and X-ray photoelectron spectroscopy showed some modifications in the metallic phase of the catalysts after the cycles, mainly in the Sn/Pt surface ratios and in segregation effects in some catalysts. However, the transmission electron microscopy (TEM) results are conclusive in the sense that, after the cycles, the bimetallic catalysts maintained a very high proportion of particles with sizes between 1-2 nm, and therefore, preserved a high metallic dispersion. K E Y W O R D S catalytic stability, MgAl 2 O 4 , n-butane dehydrogenation, PtSn structured catalysts, ZnAl 2 O 4

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“…Bulk metals [8,9] and oxides [10,11], as well as supported on various types of carriers [12], are used as catalysts for the carbon dioxide conversion of methane. However, in recent years, new types of highly active catalysts made in the combustion process have appeared.…”

Section: Introductionmentioning

confidence: 99%

Biogas Reforming over Al-Co Catalyst Prepared by Solution Combustion Synthesis Method

et al. 2021

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The results of carbon dioxide reforming of CH4 (model biogas) on catalysts prepared by solution combustion synthesis (SCS) and impregnation of moisture capacity methods are presented. Investigation of the activity of catalysts synthesized from initial mixtures of Co(NO3)2-Al(NO3)3-urea of different compositions was carried out for the production of synthesis-gas, and SCS and traditional incipient wetness impregnation catalyst preparation methods were compared. The methane conversion reached 100%, and the conversion of CO2 increased to 86.2%, while the yield of H2 and CO was 99.2% and 85.4%, respectively, at 900 °C. It was found that CoAl2O4 spinel formation was due to substitution of Al3+ with Co2+ cations. Consequently, CoAl2O4 lattice parameters increased, since the ionic radius of Al3+ (0.51Å) less than Cο2+ (0.72 Å). Advantages of SCS catalysts in comparison with catalysts prepared by the traditional incipient wetness impregnation method in dry reforming of methane were shown. The aim of this work is to develop a new catalyst for the conversion of model biogas into synthesis gas, which will contribute to the organization of a new environmentally friendly, energy-saving production in the future.

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Microchannel Autothermal Reforming of Methane to Synthesis Gas

Cited by 13 publications

References 37 publications

Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

Biogas Reforming over Al-Co Catalyst Prepared by Solution Combustion Synthesis Method

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Microchannel Autothermal Reforming of Methane to Synthesis Gas

Cited by 13 publications

References 37 publications

Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Exhaust Gas Reforming of Methane in a Catalytic Microchannel Reactor

Stability studies of PtSn structured catalysts supported on thin layers of MAl2O4 (M: Mg, or Zn) for paraffins dehydrogenation reactions

Biogas Reforming over Al-Co Catalyst Prepared by Solution Combustion Synthesis Method

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Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions