Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

Akbari-Emadabadi, S.; Rahimpour, Mohammad Reza; Hafizi, Ali; Keshavarz, Peyman

doi:10.3390/catal7090270

Cited by 18 publications

(4 citation statements)

References 49 publications

(75 reference statements)

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“…As depicted in Figure 5a, the methane conversion increases with the rise of temperature, reflecting the endothermic nature of steam methane reforming process. Therefore, high temperature is favorable for increasing the methane conversion [58,59]. The yttrium free oxygen carrier (20Ni/SBA-16) showed the lowest methane conversion in all the temperature range studied.…”

Section: Effect Of Yttrium Weight Percentage and Temperature On The Cmentioning

confidence: 95%

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

et al. 2017

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Abstract:In this work, the modification of Ni/SBA-16 oxygen carrier (OC) with yttrium promoter is investigated. The yttrium promoted Ni-based oxygen carrier was synthesized via co-impregnation method and applied in chemical looping steam methane reforming (CL-SMR) process, which is used for the production of clean energy carrier. The reaction temperature (500-750 • C), Y loading (2.5-7.4 wt. %), steam/carbon molar ratio (1-5), Ni loading (10-30 wt. %) and life time of OCs over 16 cycles at 650 • C were studied to investigate and optimize the structure of OC and process temperature with maximizing average methane conversion and hydrogen production yield. The synthesized OCs were characterized by multiples techniques. The results of X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) of reacted OCs showed that the presence of Y particles on the surface of OCs reduces the coke formation. The smaller NiO species were found for the yttrium promoted OC and therefore the distribution of Ni particles was improved. The reduction-oxidation (redox) results revealed that 25Ni-2.5Y/SBA-16 OC has the highest catalytic activity of about 99.83% average CH 4 conversion and 85.34% H 2 production yield at reduction temperature of 650 • C with the steam to carbon molar ratio of 2.

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Section: Effect Of Yttrium Weight Percentage and Temperature On The Cmentioning

confidence: 95%

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

et al. 2017

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“…Therefore, the high operating temperature is beneficial to increase catalyst performance in this process. [43,69] However, the difference between these catalysts' performance becomes lesser at higher temperatures. As per Figure 10, by increasing nickel loading from 10 to 20 wt.%, both average CH 4 conversion and average H 2 yield increase in all temperatures as a result of more available active sites in the reaction media, while further rise in Ni-loading up to 25 wt.% caused a negative impact on catalysts performance owing to the Ni active sites agglomeration as well as nickel metal-based catalysts surface area reduction.…”

Section: Co 2 -Tpd Analysismentioning

confidence: 99%

Synthesis and utilization of mesoporous alumina as a supporting material of Ce‐promoted Ni‐based catalysts in the methane reforming process

et al. 2023

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Due to the large applications of hydrogen as a feedstock of chemical industries and as an energy carrier, its production on large scales with low costs has attracted researchers. Steam reforming of methane (SRM) is the most common process for producing H2‐rich syngas over Ni/Al2O3 catalysts, which suffer from coke deposition and Ni particles agglomeration. For overcoming these issues, we have synthesized mesoporous alumina (MA) as a supporting material of Ni particles, structure, and activity, which were compared with the bulk alumina (BA) supported catalysts in the SRM process for the first time. Besides, cerium as an appropriate promoter for lowering deposited coke was added to all prepared catalysts. The reaction temperature (600–700°C), Ni loading (10–25 wt.%), and Ce loading (1–5 wt.%) were the parameters that were optimized for maximizing H2 yield and CH4 conversion. Prepared samples were characterized by various techniques before and/or after reaction. The results of TEM and XRD depicted the formation of nanocrystalline and mesoporous structure for Ni‐MA catalysts compare to Ni‐BA samples. The observations indicated that 20Ni‐3Ce/MA had the highest catalytic performance, achieving a CH4 conversion of 91.0% and H2 yield of 92.8% at 700°C.

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“…Two oxide composite materials are adressed by Karuppiah et al [6] and Akbari-Emadabadi et al [7]. In the former, the dry reforming performance of propane over alumina-supported NiO-CeO 2 is assessed.…”

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confidence: 99%

Reforming 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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Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

Cited by 18 publications

References 49 publications

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

Synthesis and utilization of mesoporous alumina as a supporting material of Ce‐promoted Ni‐based catalysts in the methane reforming process

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