Coke Resistance of Sr-Hydroxyapatite Supported Co Catalyst for Ethanol Steam Reforming

Ogo, Shuhei; Maeda, Shun; Sekine, Yasushi

doi:10.1246/cl.170072

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…Noble metal catalysts, on the other hand, are more expensive and diminish the financial benefit. Non-noble and economical metal-based catalysts with high activity are thus targeted …”

Section: Introductionmentioning

confidence: 99%

“…Non-noble and economical metal-based catalysts with high activity are thus targeted. 21 As the stoichiometry shows, the production of methane (reaction 4) and catalyst poisoning via carbon deposition (reactions 8 and 9) are considerable problems. 22 To circumvent them, two approaches have been suggested: integrating a second element and using alternate catalytic supports.…”

Section: ■ Introductionmentioning

confidence: 99%

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Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

Ranjekar

Yadav

2023

Ind. Eng. Chem. Res.

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A multipurpose catalyst made of nickel and cobalt supported on silicate-based material modified by Ca and Mg was developed and used in sorption-enhanced steam reforming of (bio)-ethanol (SESRE). In SESRE, steam reforming and CO2 conversion to carbonates occur together to yield clean hydrogen. The catalyst was designed using silica sourced from rice hull ash (RHA) by oxidation and, subsequently, Ni and Co were loaded by the wet-impregnation technique. Three catalysts, namely, Ni/Ca-Mg silicate, Co/Ca-Mg silicate, and Ni-Co/Ca-Mg silicate, were synthesized with different metal loadings (5–15% w/w), among which 10 %Ni-10% Co/Ca-Mg silicate was the most active and selective. Various characterization techniques were used to determine the physico-chemical properties of 10% NI-10% Co/Ca-Mg silicate. CO2-sorption capacity and adsorption breakthrough time were measured. An adsorption capacity of 7.4 mol CO2/kg sorbent and a breakthrough time of 58 min at T = 723 K were observed with hydrogen production at 88 mol %. The catalyst was evaluated and optimized using such parameters as temperature, S/C ratio, and space velocity. The catalyst was tested for its robustness and found to be stable for 10 cycles. 10% Ni-10% Co/Ca-Mg yielded the best hydrogen output under the optimized operating conditions.

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“…Noble metal catalysts, on the other hand, are more expensive and diminish the financial benefit. Non-noble and economical metal-based catalysts with high activity are thus targeted …”

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

Ranjekar

Yadav

2023

Ind. Eng. Chem. Res.

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“…steam reforming [102], dry reforming [18,30,[103][104][105] etc. Despite being thus of prime interest to answer the challenges or many societal issues, going from organic syntheses [14,32,60,106], to environmental reactions (for depollution [6, 10, 12, 52, 57, 58, 84-86, 101, 107] or valorization of bio-sourced molecules [35,56,[93][94][95][108][109][110][111]) and reactions for energy [27,34,36,65,89,107,112] etc.…”

Section: Introductionmentioning

confidence: 99%

Structure and Surface Study of Hydroxyapatite‐Based Materials

Costentin

Drouet

Salles

et al. 2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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In addition to designing catalytic materials ever more active and selective, the emergence of new classes of greener catalysts remains very challenging. The apatite family system with hydroxyapatite (HA) structure appears as a good candidate for catalysis due to its ecocompatibility properties, its sorption ability toward organic molecules, and its tunable composition resulting into modulation of its surface properties. Depending on their mode of preparation, these inexpensive and environment-friendly apatitic calcium phosphates exhibit properties of relevance to catalysis, such as large surface area and various morphologies.However, most studies focused so far on the catalytic performance of these compounds, while the study of structure-reactivity relationships required for rationalized optimization remains rather limited. This chapter aims at providing tools to help understand the catalytic behavior of apatite compounds, giving details about their structure, surface properties, and reactivity; this will include both stoichiometric and nonstoichiometric compounds, sometimes biomimetic and potentially substituted. A special attention is dedicated to recent advances in the characterization of their structural properties (bulk and surface/interphase) that have a strong impact on their reactivity, through both experimental and computational approaches to study the mechanisms occurring in the structure or at the crystals surface, as well as thermodynamic and dynamical properties. Remaining characterization challenges for apatite-based catalysts will also be discussed. 1.an influence on the charges carried by the cation and on the related strength of the Ca-O interaction [127], which results in different adsorption properties with guest molecules. To go further, quantum calculations coupled with NMR (Nuclear Magnetic Resonance) resultsshowed the impact of the presence of OHions on the migration of Ca 2+ as well as the rotation of PO4 3groups [128]. In the hydroxyapatite structure, phosphate ions PO4 3are the largest components of the structure. As such, they provide a primary backbone via 3D compact-like piling, generating interstitial sites for the other ions of the structure. Metal cations such as Ca 2+ occupy two types of crystallographic sites, denoted Ca1 (4 sites per unit formula) and Ca2 (6 sites per unit formula), see Figure 2. Ca1 sites are localized along the trigonal axis with the coordinates (1/4, 3/4, 1/2) and (3/4, 1/4, 1/2), forming linear columns along the c-axis. Ca2 sites in contrast form equilateral triangles at z = 1/4 and z = 3/4 on the sixfold screw (senary) 63 axes. Adjacent Ca1 and Ca2 sites are linked through shared oxygen atoms from PO4 tetrahedra. Ca1 sites generate (distorted) polyhedra where the metal ion is in ninefold coordination, while in Ca2 sites it is in sevenfold coordination.The Ca2 triangles contribute to delimit so-called "apatitic channels" where ions such as OHare axially located (Figure 3) [116,120]. In calcium hydroxyapatite, the Ca2 triangular sites correspond to the narrow...

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“…Foram reportados que a formação de espécies de acetato adsorvidos a partir do acetaldeído são eficazes na promoção preferencial da reforma a vapor de acetaldeído, Reação (13) e na supressão da decomposição do acetaldeído em CH 4 , Reação (12) [99]- [101]. A metanação de CO, Reação (19) ou CO 2 , Reação (20) com H 2 é uma reação indesejada que consome hidrogênio, relatada em pesquisas anteriores em que a reação ocorre apenas superficialmente em catalisadores à base de Co [99][100] [102].…”

Section: Reforma a Vapor Do Etanolunclassified

Desenvolvimento de célula a combustível de óxido sólido de temperatura intermediária a etanol direto com camada catalítica à base de céria

Tabuti

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Gostaria de agradecer ao meu orientador Prof. Dr. Fabio Coral Fonseca por todo seu apoio, conselhos e tempo despedido que foram fundamentais para condução e conclusão deste trabalho. Gostaria de agradecer à Prof. Dra. Dolores Ribeiro Ricci Lazar e ao Prof. Dr. Daniel Zanetti di Florio que me acompanharam e deram importantes contribuições para o desenvolvimento deste trabalho. Gostaria de agradecer ao Prof. Dr. José Fernando Queiruga Rey e ao Prof. Dr. Leandro da Conceição que deram importantes contribuições para a finalização deste trabalho. Gostaria de agradecer ao IPEN -Instituto de Pesquisas Energéticas e Nucleares e aos seus funcionários cujas instalações permitiram a realização dos experimentos e testes empreendidos. Também gostaria de expressar minha consideração e apreço pelo apoio e incentivo aos meus colegas de trabalho e estudantes do CECCO -Centro de Células a Combustível. E aos meus pais, esposa e família minha gostaria de expressar minha profunda gratidão. vi RESUMO Desenvolvimento de célula a combustível de óxido sólido de temperatura intermediária a etanol direto com camada catalítica à base de céria.As células a combustível de óxidos sólidos (SOFC) apresentam diversas vantagens com relação a dispositivos tradicionais geradores de energia, inclusive se comparadas a outros tipos de célula a combustível. Entre as principais características das SOFC destacam-se: elevada eficiência de conversão, descentralização da produção de energia, possibilidade de uso de combustíveis diversos como gás natural e etanolque são estratégicos para Brasil -e a baixa emissão de poluentes. Entretanto, existem várias barreiras a serem superadas para a difusão dessa tecnologia. Entre elas, a alta temperatura de operação da célula -que resulta em vários problemas para montagem e operação de um sistema de potência elevando o custo do sistema -e a desativação da célula devido à deposição de carbono na superfície do anodo de níquel quando a célula é alimentada com hidrocarbonetos. Muitas pesquisas têm buscado superar estes problemas garantindo a estabilidade da SOFC. A estratégia escolhida para se tentar solucionar esse problema é a utilização de componentes anódicos ativos para reforma catalítica do combustível, associado a um processo de reforma interna do combustível, fornecendo H 2 e CO, passíveis de oxidação eletroquímica .Desta maneira, este trabalho de doutoramento aborda estes dois aspectos: (I) baixar a temperatura de operação da célula para temperaturas intermediárias, ou seja, de 850 °C para 600 °C e (II) utilização direta do etanol como combustível pelo processo de reforma interna. São apresentados os resultados de testes de células operando com etanol direto em alta temperatura e resultados de células suportadas no anodo com camadas catalíticas -sem a presença de metais preciososoperando com etanol direto em temperaturas intermediárias. São descritos os procedimentos para fabricação da célula suportada no eletrólito e para preparação e aplicação das suspensões utilizadas nas diferentes camadas da célula. Também são...

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Coke Resistance of Sr-Hydroxyapatite Supported Co Catalyst for Ethanol Steam Reforming

Cited by 17 publications

References 24 publications

Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

Structure and Surface Study of Hydroxyapatite‐Based Materials

Desenvolvimento de célula a combustível de óxido sólido de temperatura intermediária a etanol direto com camada catalítica à base de céria

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