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Dissertations / Theses on the topic 'Ni/Al2O3 catalyst'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Natesakhawat, Sittichai. "Investigation of active sites and reaction networks in catalytic hydrogen production steam reforming of lower alkanes and the water-gas shift reaction /." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1110209339.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xiv, 194 p.; also includes graphics Includes bibliographical references (p. 178-188). Available online via OhioLINK's ETD Center

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2

Brillouet, Soizic. "Désoxygénation de composés modèles représentatifs de ceux présents dans les biohuiles sur catalyseurs sulfurés." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2320/document.

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L'utilisation de biohuiles comme carburants provenant de la transformation de différents types de biomasse (lignocellulosique, huile végétale, algue,...) est une alternative intéressante aux produits pétroliers développée depuis quelques années par l'Union Européenne. Cependant, le taux d'oxygène de ces biohuiles doit être fortement réduit avant leur introduction dans le pool carburant.Afin de modéliser ces huiles, différents composés oxygénés modèles ont été utilisés (acide décanoïque, décanal, phénol) seuls ou en mélange. Leur désoxygénation a été étudiée à 340 °C et sous 4 MPa, à la fois su

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3

Champon, Isabelle. "Compréhension et modélisation des mécanismes de désactivation d’un catalyseur de méthanation de CO2 au sein d’un réacteur-échangeur milli-structuré à lit fixe." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF045.

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Le Power-to-SNG est un procédé permettant de stocker le surplus d’énergie électrique renouvelable sous forme de SNG (Substitute Natural Gas) via la réaction de méthanation de CO2, catalysée par un catalyseur solide. Dans le but d’une injection directe du SNG dans le réseau de gaz, il est nécessaire d’obtenir des taux de conversion élevés. Néanmoins, au cours du temps, le catalyseur se désactive et il est alors possible que le gaz produit ne respecte plus les spécifications d’injection dans le réseau de gaz. Dans ces travaux, une méthodologie est mise en place pour comprendre les principaux méc

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4

Matos, Thaisa Moreira de. "Catalisadores de Ni suportados em Al2O3 modificados com V, Nb e Zn aplicados na reforma à vapor do ácido butírico para produção de H2." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-22052017-081023/.

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O hidrogênio é visto como um importante combustível alternativo aos combustíveis convencionais, como a gasolina e o óleo diesel, devido a sua alta eficiência energética e não geração de poluentes. Porém, a maior parte do hidrogênio produzido é proveniente de fontes não renováveis, como o gás natural e o petróleo. Novas tecnologias para a geração de hidrogênio vem sendo estudadas e dentre elas se destaca a reação de reforma a vapor de compostos ox

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5

Abreu, Amanda Jordão de. "Efeito da adição de CeO2 no catalisador Ni/Al2O3 aplicado durante as reações de reforma a vapor e com dióxido de carbono do metano." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-18042008-152035/.

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Na atualidade, a reforma do metano é de grande interesse industrial para o aproveitamento deste gás na produção de hidrogênio e de gás de síntese. Entre as reações de reforma do metano, destacam-se as reações de reforma a vapor e a reação com dióxido de carbono.O catalisador comumente utilizado nos processos re reforma do metano é Ni/Al2O3. Porém durante este processo, ocorre uma indesejada formação de depósitos de espécies carbonáceas na superfície deste catalisador, os quais levam a sua destruição mecânica e conseqüentemente sua desativação. Por isso, uma das propriedades mais importantes d

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6

Faustino, Patrícia Brígida. "Catalisadores derivados de óxidos do tipo perovskita LaMO3, LaMFeO3 e LaMO3/γ-Al2O3 (M = Co, Ni ou Fe) aplicados à reforma a vapor de etanol." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/3962.

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Made available in DSpace on 2016-06-02T19:55:42Z (GMT). No. of bitstreams: 1 6404.pdf: 6288273 bytes, checksum: f141c2e0ebc71d3e9e5003320f139929 (MD5) Previous issue date: 2014-07-30<br>Financiadora de Estudos e Projetos<br>The hydrogen production has been extensively studied as a clean and powerful energy source, indicating that in the future hydrogen will became a key component for the global energy production, since burning fossil fuels, used nowadays, emits disturbing amounts of gases that cause the greenhouse effect and the global warming, which urgently needs to be reduced. Thus, hydro

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7

Karam, Leila. "New routes of preparation of active and stable mesoporous Ni-alumina based catalysts for methane dry reforming and CO2 methanation." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS163.pdf.

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Le reformage à sec du méthane (DRM) est un processus qui convertit simultanément CH4 et CO2 en un mélange gazeux de H2 et de CO appelé syngas. Les catalyseurs à base de Ni sont particulièrement prometteurs mais ils ne sont pas stables en raison du frittage du Ni et du dépôt de coke. Dans cette thèse, nous avons développé deux voies de synthèse de catalyseurs mésoporeux à base de Ni-Al2O3 dans lesquels Ni est stabilisé dans l'oxyde, ce qui donne une activité et une stabilité élevées en DRM. Des techniques physicochimiques complémentaires ont été appliquées pour identifier les propriétés des mat

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8

Melo, Jarbas Almeida de. "Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8981.

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Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-10-15T15:41:01Z No. of bitstreams: 2 Dissertação - Jarbas Almeida de Melo - 2018.pdf: 7287109 bytes, checksum: 8e33ba1a3ef2d679e03ecdb4e368b53c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-10-16T10:13:44Z (GMT) No. of bitstreams: 2 Dissertação - Jarbas Almeida de Melo - 2018.pdf: 7287109 bytes, checksum: 8e33ba1a3ef2d679e03ecdb4e368b53c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Mad

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Mattos, Junior Arthur Romualdo J. de Mello. "Estudo do efeito da concentração do niquel e da natureza do suporte de "gama"-alumina, sobre as propriedades do catalisador de NI/"gama"-AL2O3, na reação de hidrogenação do 2-etil-2-hexenal em fase liquida." reponame:Repositório Institucional da UFSC, 1994. http://repositorio.ufsc.br/xmlui/handle/123456789/76036.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Fisicas e Matematicas<br>Made available in DSpace on 2012-10-16T06:46:12Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T19:04:13Z : No. of bitstreams: 1 97853.pdf: 2173820 bytes, checksum: 06f817054ade2c6775d367f7a47f4476 (MD5)<br>Catalisadores de Ni/-alumina foram preparados, caracterizados por DRX, DRS, RIP e testados na reação de hidrogenação do 2-etil-hexenal em fase líquida. A reação foi executada em um reator semi-batelada de leito de lama, a pressão atmosférica. O objetivo do trabalho foi de o

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10

Wu, Yi-Wei, та 吳義偉. "Plasma modification of the Ni/γ-Al2O3 catalyst with Dielectric Barrier Discharges". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08060376540596692786.

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碩士<br>國立中央大學<br>環境工程研究所<br>97<br>The plasma modification of the catalyst is a novel way to improve performance of catalyst. Such prepared catalyst presents a higher catalytic activity and an enhanced stability over the catalyst prepared without plasma treatment. This study aims to evaluate the characteristics of Ni/Al2O3 catalyst for steam reforming of ethanol to syngas via a DBD by different flowing gases and with different processes. DBD reactor is made of the quartz tube with the inner diameter of 10.6 mm. A stainless steel rod with the diameter of 0.1 mm is used as the inner electrode and

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11

Wang, Pei-Lun, and 王培倫. "Synthesis of Carbon Nanofibers with Specific Microstructures by a Ni/Al2O3 Composite Catalyst." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/10591902911446511381.

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博士<br>大同大學<br>材料工程學系(所)<br>93<br>Carbon nanofibers (CNFs) were synthesized by a chemical vapor deposition method with a Ni/Al2O3 composite catalyst. CNFs with specific structures, including the herringbone, short internal cavities, extended internal cavities and bamboo-like structure, can be synthesized at different synthetic temperatures. The gas feed can modify the synthetic temperature. The maximum growth temperature for CNFs with a CH4/N2 feed is 873 K and with a CH4/H2 feed is 973 K. The cause of formation of CNFs with internal cavities is considered to be the quasi-liquid state of cataly

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12

Pei-Lun, Wang, and 王培倫. "Synthesis of Carbon Nanofibers with Specific Microstructures by a Ni/Al2O3 Composite Catalyst." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/10721643541112799327.

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博士<br>大同大學<br>材料工程研究所<br>93<br>Carbon nanofibers (CNFs) were synthesized by a chemical vapor deposition method with a Ni/Al2O3 composite catalyst. CNFs with specific structures, including the herringbone, short internal cavities, extended internal cavities and bamboo-like structure, can be synthesized at different synthetic temperatures. The gas feed can modify the synthetic temperature. The maximum growth temperature for CNFs with a CH4/N2 feed is 873 K and with a CH4/H2 feed is 973 K. The cause of formation of CNFs with internal cavities is considered to be the quasi-liquid state of catalyst

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13

Chen, Chia-Ying, and 陳佳瑩. "The study of Ni/SiO2@Al2O3 core-shell catalyst for hydrogen production from simulated waste plastics gasification syngas." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5087052%22.&searchmode=basic.

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碩士<br>國立中興大學<br>環境工程學系所<br>107<br>Due to the depletion of energy, the development of renewable energy has been received high attention. The management of the huge amount of plastic waste is also a critical environmental issue. Recycling of plastics through thermal treatments not only can treat plastic waste but also can generate renewable energy and valuable products. In this study, the core-shell catalyst was applied to catalytic gasification of simulated syngas derived from plastic wastes simulated plastic gasification syngas. The Ni/SiO2 particles were prepared by the polyol method, and the

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14

Φούσκας, Αγάπιος. "Μελέτη τροποποιημένων με βόριο καταλυτών Νi/Al2O3 για την αναμόρφωση του μεθανίου με διοξείδιο του άνθρακα". Thesis, 2011. http://hdl.handle.net/10889/4965.

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Κατά τις τελευταίες δεκαετίες παρατηρείται συνεχής αύξηση της έντασης του φαινομένου του θερμοκηπίου γεγονός που προκαλεί σημαντικές συνέπειες στο περιβάλλον και στη ζωή μας γενικότερα. Συνεπώς, είναι απαραίτητη η μείωση της ανθρωπογενούς εκπομπής των αερίων που συμβάλλουν στην αύξηση του φαινομένου αυτού. Η εκμετάλλευση και χρήση των δύο πιο σημαντικών θερμοκηπικών αερίων, του μεθανίου και του διοξειδίου του άνθρακα, μπορεί να επιτευχθεί με την αναμόρφωση του CH4 με CO2 ή αλλιώς ξηρή αναμόρφωση του μεθανίου (Dry Reforming of Methane-DRM). Με τη διεργασία DRM τα δύο συγκεκριμένα αέρια μετατρέπ

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15

Chin, Si-Yi, та 秦羲儀. "Preparation, Characterization and Catalytic Reactions of Ni/ γ-Al2O3 Catalysts". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/01853983964894280775.

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碩士<br>東海大學<br>化學系<br>95<br>A series of Ni/ γ-Al2O3 catalysts with Ni loading 5 wt%, 10 wt%, 15 wt% and 20 wt% were prepared by impregnation and were utilized to catalyze the hydrogenation of cinnamaldehyde and the dehydrogenation of ethylbenzene. The catalyst structure, surface area, pore diameter, acidity, reducibility, metal dispersion and particle size were determined by using XRD, N2 adsorption-desorption, TPD, TPR, CO-chemisorption, FE-SEM and TEM. Both the catalytic acid amount and metal dispersion decrease with the metal content, but the surface area and the pore diameter exhibit small

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16

Pan, Shih Meng, and 潘士盟. "Comparisons of the Product Gases from the Rice Husk Steam Reforming Reactions over ZnO/Al2O3, Ni/Al2O3 or CuO/Al2O3 Catalysts." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/4r2c8r.

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碩士<br>長庚大學<br>化工與材料工程研究所<br>96<br>Agriculture waste rice husk from Changhua area was used as the biomass to undertake steam reforming reaction at 350-800℃ in a packed bed reactor with 46mm in internal diameter, 550 mm in length and 2.5 mm in wall thickness. 13 wt.%ZnO/Al2O3, 13 wt.% Ni/Al2O3, or 13 wt.% CuO/Al2O3 was used as the catalysts in the packed bed reactor. The effects of the catalyst loading, reaction temperature, steam-to-carbon (S/C) molar ratio on the produced syngas compositions were studied. The experimental results showed that the reaction temperature obviously affected the comp

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17

Cjuang, Jiun-Yuan, and 莊峻源. "EFFECT OF COBALT PROMOTER ON CHARACTERISTIC OF AMORPHOUS Ni-B/r-Al2O3 CATALYSTS." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/19413322620128162558.

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碩士<br>大同工學院<br>化學工程研究所<br>87<br>The high performance amorphous Ni-Co-B/r-Al2O3 catalysts with high activity, high selectivity and high thermal stability were prepared by chemical reduction-impregnation method, and cobalt introduced as pormoter. The samples were prepared by r-Al2O3 supported in various molar ratios of nickel nitrate to cobalt nitrate which were added into aqueous solution of potassium borohydride. The physical and chemical properties of catalysts were analyzed by using ICP, DSC, BET, TPR SEM, TEM and XRD. The catalytic activities of the prepared catalysts were measured through

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18

Huang, Huai-Te, and 黃懷德. "Study of reverse water gas shift reaction over Ni/Al2O3 and atomic-layer-epitaxy Cu catalysts." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/36899160678450309183.

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碩士<br>長庚大學<br>化工與材料工程研究所<br>94<br>The goal of this thesis is anticipated to develop some high performance catalysts for recycle of carbon dioxide and chemical conversion of CO2 to CO by means of catalytic reaction. This study contains: (1) the reverse water gas shift (RWGS) reaction on Ni/Al2O3 with and without；(2) the new Cu catalysts prepared by atomic layer epitaxy (ALE) technique applied in CO2 conversion to CO. One can see that CO and CH4 are the major products during RWGS reaction on Ni/Al2O3 and K-Ni/Al2O3 catalysts. The catalystic activity of Ni catalysts will slightly decrease with in

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