Production of Renewable Hydrogen from Glycerol Steam Reforming over Bimetallic Ni-(Cu,Co,Cr) Catalysts Supported on SBA-15 Silica

Carrero, A.; Calles, J.A.; García-Moreno, Lourdes; Vizcaíno, A.J.

doi:10.3390/catal7020055

Cited by 70 publications

(52 citation statements)

References 42 publications

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“…In fact, the well-dispersed noble metals nanoparticles were easily reduced below 130 • C while the Pt and/or Rh nanoparticles strongly interacting with Ni and/or with CeO 2 -SiO 2 support were reduced in the temperature range of 150-300 • C [36,40]. On the other hand, for all the prepared catalysts, the reduction band observed at high temperature can be deconvoluted into two hydrogen consumption peaks, which indicates that NiO particles differently interacted with the support: free NiO particles can be reduced earlier than NiO strongly bonded on CeO 2 -SiO 2 support [41].…”

Section: Textural/structural Properties and H 2 -Tpr Measurementsmentioning

confidence: 91%

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Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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Abstract:In this work, a series of CeO 2 -SiO 2 (30 wt % of ceria)-based catalysts was prepared by the wetness impregnation method and tested for ESR (ethanol steam reforming) at 450-500 • C, atmospheric pressure and a water/ethanol ratio increasing from 4 to 6 (the ethanol concentration being fixed to 10 vol %); after every test, coke gasification measurements were performed at the same water partial pressure, and the temperature of the test and the gasified carbon was measured from the areas under the CO and CO 2 profiles. Finally, oxidation measurements under a 5% O 2 /N 2 stream made it possible to calculate the total carbon deposited. In an attempt to improve the coke resistance of a Pt-Ni/CeO 2 -SiO 2 catalyst, the effect of support basification by alkali addition (K and Cs), as well as Pt substitution by Rh was investigated. The novel catalysts, especially those containing Rh, displayed a lowering in the carbon formation rate; however, a faster reduction of ethanol conversion with time-on-stream and lessened hydrogen selectivities were recorded. In addition, no significant gain in terms of coke gasification rates was observed. The most active catalyst (Pt-Ni/CeO 2 -SiO 2 ) was also tested under different operative conditions, in order to study the effect of temperature and water/ethanol ratio on carbon formation and gasification. The increase in the water content resulted in an enhanced reactor-plugging time due to reduced carbonaceous deposits formation; however, no effect of steam concentration on the carbon gasification rate were recorded. On the other hand, the increase in temperature from 450-500 • C lowered the coke selectivity by almost one order of magnitude improving, at the same time, the contribution of the gasification reactions.

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Section: Textural/structural Properties and H 2 -Tpr Measurementsmentioning

confidence: 91%

“…NiO particles differently interacted with the support: free NiO particles can be reduced earlier than NiO strongly bonded on CeO2-SiO2 support [41]. Rh-containing samples displayed the lowest temperature for consumption peaks, due to the improved catalyst reducibility upon Rh addition [42].…”

Section: Textural/structural Properties and H 2 -Tpr Measurementsmentioning

confidence: 99%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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“…Lot of articles has been published recently on this topic [6][7][8][9][10]. Among various hydrogen production techniques direct thermo-catalytic decomposition of methane to produce pure hydrogen gas has shown most promising results [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of catalytic bed position on hydrogen production by methane decomposition

Sikander¹,

Sufian²,

KuShaari³

et al. 2018

J. MECH. ENG. SCI.

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CO x free hydrogen can be produced by thermal decomposition of methane. Such process is carried out in a fixed bed catalytic reactor. Where heterogeneous catalytic reaction occur when methane come in contact with catalyst bed at a temperature range of 650-900ºC. In this work effect of different catalyst bed positions are investigated on the overall methane conversion to hydrogen. Experimental studies are carried out to in a Fixed Bed Reactor at 700 o C, by placing a catalyst bed of same porosity µ=0.2 at 25%, 50%, 75% column height, and at top of reactor. It is found that same catalyst has shown different results when placed at different heights in reactor column. Highest methane conversion of 85% is found when catalyst bed is placed at 25% column height from bottom. It is found that for endothermic reactions like methane decomposition catalyst bed position has its significance due to its effects on process thermal conditions and on bed expansion by carbon deposition.

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“…The role of intermetallic compound and alloy formation in enhancing the performance of metal catalysts in reforming reactions are subsequently addressed by Carrero et al [8] and Köpfle et al [9]. Glycerol steam reforming and the associated hydrogen production are studied by the former on a variety of bimetallic Ni-M/silica (M = Co, Cu, Cr) catalysts.…”

mentioning

confidence: 99%

“…Glycerol steam reforming and the associated hydrogen production are studied by the former on a variety of bimetallic Ni-M/silica (M = Co, Cu, Cr) catalysts. Cr addition is shown to be most promising in terms of glycerol conversion, reduction of coke formation and hydrogen formation, which is ascribed to enhanced metal-support interaction [8]. In situ decomposition of a Cu 51 Zr 14 intermetallic compound during methanol steam reforming is shown to enhance the CO 2 selectivity by in situ activation and corrosion of both catalyst bulk and surface to form dispersed Cu particles in synergistic contact with tetragonal ZrO 2 .…”

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confidence: 99%

Reforming Catalysts

Penner

2017

Catalysts

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Steam and dry reforming of hydrocarbons (e.g., methane, ethane or propane), alcohols (e.g., methanol, ethanol or glycerol) or bio-compounds is one of the most promising and effective routes to enhanced hydrogen production and for the production of synthesis gas likewise. For steam reforming, the most crucial step of this reaction is efficient water activation, which is a necessary prerequisite for both a high CO 2 selectivity and a high associated hydrogen yield. The reactions have been studied on a variety of different catalytic surfaces, encompassing oxides, supported metal-oxide systems or (supported) intermetallic compounds. The controllable steering of product selectivity is thereby an obvious key criterion for technical usage. For methanol steam reforming, the key targets-apart from pronounced CO 2 selectivity-are, thus, a maximum hydrogen yield and a low CO content in the reformate to realize the efficient on-board production of clean hydrogen in, e.g., automotive applications. Given the structural and chemical complexity and diversity of the materials used, the question about the common elementary reaction steps of the steam reforming reaction is imperative. For structurally more complex materials, such as the recently put-forward oxide-supported Pd-based intermetallic phases, a bifunctional synergism is usually assumed, where the participating catalytic entities (or the in situ created interface) synergistically act in the catalytic reaction. In this special issue, we show the complexity of the interplay between the synthesis and performance of novel materials in a variety of technologically important reforming reactions. To do the complexity justice, the materials discussed particularly reflect the importance of accurate synthesis procedures to prospective catalytic materials.Two review reports by Debek et al.[1] and Du et al.[2] deal with the reforming properties of hydrotalcite-derived materials in methane dry reforming and methane and ethanol steam reforming, respectively. The effects of catalyst preparation and regeneration, thermal treatment processes, composite design, catalyst deactivation and the addition of dopants are addressed in both reviews for Ni-based hydrotalcite materials.The role of metal-oxide and oxide-oxide composite materials as well as intermetallic and alloy catalysts in reforming of hydrocarbons, alcohols and bio-compounds (acetone, furfural and glucose) forms the core of the eight regular articles that are part of this special issue. Ethanol steam reforming over Sc 2 O 3 -doped Co-ZnO catalysts is adressed by Liang et al. Sc 2 O 3 doping is shown to enhance catalytic performance, exceeding that of Sc 2 O 3 -free Co-ZnO considerably [3]. The improved catalytic activity is ascribed to an increased electronic interaction between Co and ZnO, leading to elevating the reduction temperature of Co oxides, increasing the disperison of ionic Co species and improved sintering behavior of active Co species. Cheng et al. focus on the role of auto-reduced Ni-Al 2 O 3 catalysts in steam refo...

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Production of Renewable Hydrogen from Glycerol Steam Reforming over Bimetallic Ni-(Cu,Co,Cr) Catalysts Supported on SBA-15 Silica

Cited by 70 publications

References 42 publications

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Effects of catalytic bed position on hydrogen production by methane decomposition

Reforming Catalysts

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