Hydrogen production by steam reforming of dimethyl ether over Pd-based catalytic monoliths

Ledesma, Cristian; Ozkan, Umit S.; Llorca, Jordi

doi:10.1016/j.apcatb.2010.11.011

Cited by 37 publications

(25 citation statements)

References 32 publications

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“…Most of these studies have been addressed towards the formulation of active, selective and stable catalysts and, for practical reasons, powdered catalysts have been generally used. As an additional step in catalyst implementation for real applications a few works have been carried out over catalytic cordierite honeycombs [21,41,42,[66][67][68][69][70][71][72] as well as microreactors and foams [27,[73][74][75][76][77][78]. Here we extend these studies towards process intensification in DME fuel reformers by using catalytic microstructures containing channels with smaller dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…CH 3 OCH 3 + (3-n) H 2 O + n/2 O 2 → (6-n) H 2 + 2 CO 2 (1) The catalytic reforming of DME at moderate temperature consists of two consecutive reactions; first, DME is hydrolyzed to methanol over an acid catalyst, and then methanol is subsequently transformed into a mixture of H 2 and CO x over a metal function with the participation of the water gas shift reaction (WGS). Acidity of the catalyst is supplied by the support, usually γ-Al 2 O 3 , ZrO 2 , WO 3 /ZrO 2 and zeolites such as ZSM-5 [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], but also tungstosilicoheteropolyacids, Ga 2 O 3 /TiO 2 and Mo 2 C [24][25][26], whereas the metal function is usually based on Cu (normally CuZn or Cu/CeO 2 ) [27][28][29][30][31][32][33][34][35][36][37][38][39] or Pd (Pd or PdZn) [40][41][42][43], although the use of other metals such as Ni, Pt, Rh, Ru and Au [44][45][46][47][48][49][50]…”

Section: Introductionmentioning

confidence: 99%

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Catalytic reforming of dimethyl ether in microchannels

et al. 2019

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The steam reforming and oxidative steam reforming of dimethyl ether (DME) were tested at 573-773 K over a CuZn/ZrO 2 catalyst in microreactors with three different types of channels: ceramic square channels with side lengths of 900 and 400 μm, and silicon microchannels of 2 μm of diameter. The channels were first coated with ZrOCl 2 (ceramic channels) or Zr(i-PrO) 4 (silicon microchannels) and calcined at 773 K for 2 h to obtain a homogeneous and well-adhered ZrO 2 layer, as determined by SEM, and then Cu and Zn (Cu:Zn = 1:1 M, 20 wt% total metal) were co-impregnated. Operation at highly reduced residence time (10 −3 s) while achieving hydrogen yields similar to those recorded over the ceramic channels was possible for the silicon microchannels due to the three orders of magnitude increased contact area. In addition, the amount of catalyst used for coating the silicon microchannels was two orders of magnitude lower with respect to the conventional ceramic channels. Outstanding specific hydrogen production rates of 0.9 L N of H 2 per min and cm 3 of reactor volume were achieved as well as stable operation for 80 h, which demonstrates the feasibility of using on-site, on-demand hydrogen generation from DME for portable fuel cell applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic reforming of dimethyl ether in microchannels

et al. 2019

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“…Finally, DME storage and transport infrastructures are the same as LPG or natural gas, making it cheaper to integrate than compared to hydrogen. On the other hand, from a technological point of view employing DME would solve the problems linked to the thermal management coming from high reforming temperature of ethanol (above 700ºC), since the DME reforming reaction occurs at much lower temperatures 17 .…”

Section: Introductionmentioning

confidence: 99%

A Pd/Al₂O₃-based micro-reformer unit fully integrated in silicon technology for H-rich gas production

Bianchini

Alayo

Soler

et al. 2019

J. Phys.: Conf. Ser.

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This work reports the design, manufacturing and catalytic activity characterization of a micro-reformer for hydrogen-rich gas generation integrated in portable-solid oxide fuel cells (μ-SOFCs). The reformer has been designed as a silicon micro monolithic substrate compatible with the mainstream microelectronics fabrication technologies ensuring a costeffective high reproducibility and reliability. Design and geometry of the system have been optimized comparing with the previous design, consisting in an array of more than 7x10 3 vertical through-silicon micro channels perfectly aligned (50 μm diameter) and a 5 W integrated serpentine heater consisting of three stacked metallic layers (TiW, W and Au) for perfect adhesion and passivation. Traditional fuels for SOFCs, such as ethanol or methanol, have been replaced by dimethyl ether (DME) and the chosen catalyst for DME conversion consists of Pd nanoparticles grafted on an alumina active support. The micro-channels have been coated by atomic layer deposition (ALD) with amorphous Al 2 O 3 and the influence of rapid thermal processing (RTP) on such film has been studied. A customized ceramic 3Dprinted holder has been designed to measure the specific hydrogen production rates, DME conversion and selectivity profiles of such catalyst at different temperatures.

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“…This is because of the presence of the metal that strongly promotes methanol transformation reactions. [42] Methanol is only detected at the lowest temperature tested, 673 K. At this temperature, the only products of the reaction besides methanol are H 2 , CO, and CH 4 , which are likely produced by the decomposition of methanol and DME and/or CO methanation. At a higher temperature, 723-823 K, methanol is no longer detected and CO2 is present in the reaction products, which implies that the reforming of methanol takes place : CH 3 OH+H 2 OÐ3 H 2 +CO.…”

Section: Dme Steam Reformingmentioning

confidence: 99%

“…, Al2O3, ZrO2, zeolites, and WO3) is needed to convert DME into methanol, whereas the steam re-forming of methanol usually employs either a Cu- or Pd-based [42] catalytic system. In recent years, several studies have been reported with regard to the architecture of the sup-port [43][44][45][46][47][48][49][50][51][52][53][54] and the use of Mo2C.…”

Section: Introductionmentioning

confidence: 99%

Improved Stability of Pd/Al₂O₃ Prepared from Palladium Nanoparticles Protected with Carbosilane Dendrons in the Dimethyl Ether Steam Reforming Reaction

et al. 2015

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The dimethyl ether steam reforming reaction to generate hydrogen was tested over 1 wt % Pd/Al 2 O 3 catalysts prepared from different precursors. The conventional catalyst prepared by incipient wetness impregnation from palladium nitrate underwent strong deactivation under reforming conditions at 823 K because of metal sintering and carbon deposition. The same occurred over the catalyst prepared from preformed Pd nanoparticles protected with dodecanethiol. In contrast, cata-lysts prepared from Pd nanoparticles protected with carbosi-lane dendrons showed enhanced stability and good per-formance for the production of hydrogen. This was because of the formation of SiO2 at the PdAl2O3 interface that acted as a pinning center and prevented Pd migration under the reac-tion conditions as well as the accumulation of carbon.

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Hydrogen production by steam reforming of dimethyl ether over Pd-based catalytic monoliths

Cited by 37 publications

References 32 publications

Catalytic reforming of dimethyl ether in microchannels

Catalytic reforming of dimethyl ether in microchannels

A Pd/Al₂O₃-based micro-reformer unit fully integrated in silicon technology for H-rich gas production

Improved Stability of Pd/Al₂O₃ Prepared from Palladium Nanoparticles Protected with Carbosilane Dendrons in the Dimethyl Ether Steam Reforming Reaction

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Hydrogen production by steam reforming of dimethyl ether over Pd-based catalytic monoliths

Cited by 37 publications

References 32 publications

Catalytic reforming of dimethyl ether in microchannels

Catalytic reforming of dimethyl ether in microchannels

A Pd/Al2O3-based micro-reformer unit fully integrated in silicon technology for H-rich gas production

Improved Stability of Pd/Al2O3 Prepared from Palladium Nanoparticles Protected with Carbosilane Dendrons in the Dimethyl Ether Steam Reforming Reaction

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Product

Resources

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A Pd/Al₂O₃-based micro-reformer unit fully integrated in silicon technology for H-rich gas production

Improved Stability of Pd/Al₂O₃ Prepared from Palladium Nanoparticles Protected with Carbosilane Dendrons in the Dimethyl Ether Steam Reforming Reaction