scholarly journals A Facile Fabrication of Supported Ni/SiO2 Catalysts for Dry Reforming of Methane with Remarkably Enhanced Catalytic Performance

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 183 ◽  
Author(s):  
Yan Xu ◽  
Qiang Lin ◽  
Bing Liu ◽  
Feng Jiang ◽  
Yuebing Xu ◽  
...  
Keyword(s):  
Side Reaction ◽  
Combustion Method ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Molar Ratio ◽  
Excellent Activity ◽  
Facile Fabrication ◽  
Water Gas ◽  
Supported Ni

Ni catalysts supported on SiO2 are prepared via a facile combustion method. Both glycine fuel and ammonium nitrate combustion improver facilitate the formation of much smaller Ni nanoparticles, which give excellent activity and stability, as well as a syngas with a molar ratio of H2/CO of about 1:1 due to the minimal side reaction toward revserse water gas shift (RWGS) in CH4 dry reforming.

scholarly journals CO2 Reforming of Methane over LaNiO3 Perovskite Supported Catalysts: Influence of Silica Support

2019 ◽  
Vol 14 (3) ◽  
pp. 568 ◽  
Author(s):  
Djamila Sellam ◽  
Kahina Ikkour ◽  
Sadia Dekkar ◽  
Hassiba Messaoudi ◽  
Taous Belaid ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Catalyst Support ◽  
Combustion Method ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
High Catalytic Activity ◽  
Co2 Reforming ◽  
Auto Combustion ◽  
Temperature Programmed

The study presents the dry reforming of methane using natural Kaolin silica as catalyst support. The silica-supported LaNiO3 perovskite catalysts (20LaNiO3/SiO2 and 40LaNiO3/SiO2) and bulk LaNiO3 catalyst were synthesized by auto-combustion method. The resulting catalysts were characterized by X-ray diffraction (XRD), N2 adsorption - desorption isotherm measurement,  scanning electron microscopy (SEM) and temperature-programmed reduction (TPR). After reduction at 700 °C, they were used as catalysts for the reaction of dry reforming of methane into synthesis gas at atmospheric pressure at 800 °C. The reduced 40LaNiO3/SiO2 exhibited high catalytic activity. This result was attributed to the small Ni metallic particles obtained from the reduced perovskite highly dispersed on the support and the good reducibility. The increase of reduction temperature at 800 °C resulted in a further enhancement of the catalytic performance of 40LaNiO3/SiO2 catalyst. Copyright © 2019 BCREC Group. All rights reserved 

scholarly journals Pt-based Catalysts in the Dry Reforming of Methane: Effect of Support and Metal Precursor on the Catalytic Stability

2021 ◽  
Vol 65 (1) ◽  
Author(s):  
Daniel G. Araiza ◽  
Francisco González-Vigi ◽  
Antonio Gómez-Cortés ◽  
Jesús Arenas-Alatorre ◽  
Gabriela Díaz
Keyword(s):  
Supported Catalysts ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Molar Ratio ◽  
El Sistema ◽  
Catalytic Stability ◽  
Ceria Catalysts ◽  
The Stability ◽  
Effect Of Support

Abstract. Platinum catalysts (1.5 wt. %) supported over CeO2 and γ-Al2O3 were synthesized via wet impregnation using two different Pt precursors: H2PtCl6 and Pt(acac)2. Catalysts were tested in the dry reforming of methane (DRM) reaction at stoichiometric conditions (CH4/CO2 molar ratio of 1) with two approaches: as a function of temperature (400-800 °C) and as a function of time on-stream (800 °C / 24 h). Platinum supported over ceria catalysts showed better catalytic properties, especially in the stability tests, where deactivation was almost negligible. In contrast, alumina-supported catalysts stability was considerably lower due to the increased formation of carbon residues and the significant Pt particle sintering after reaction at 800 °C for 24 h. Through different characterization techniques (TEM, CO chemisorption), a strong Pt-Ceria interaction was evidenced, which helped in preventing Pt particle agglomeration under reaction conditions and promoted active interface sites. Both features are proposed to be responsible for the Pt/CeO2 catalysts better catalytic performance. The effect of the Pt precursor depends on the nature of the support. In ceria, Cl species benefited the generation of oxygen vacancies and surface ceria reducibility; both features are responsible for the Pt/CeO2 anti-coke properties, thus impacting positively in the catalytic performance of the Pt(-cl)/Ce sample. Conversely, in alumina, these Cl species triggered particle sintering and carbon deposition during the DRM reaction, affecting the Pt(-cl)/Al catalytic performance.                                                Resumen. Catalizadores de platino (1.5 % en peso) soportados sobre CeO2 y γ-Al2O3 fueron sintetizados mediante impregnación húmeda utilizando dos diferentes precursores de Pt: H2PtCl6 and Pt(acac)2. Los catalizadores fueron evaluados en la reacción de reformado seco de metano (DRM) en condiciones estequiométricas (razón molar de CH4/CO2 igual a 1) y con dos metodologías: en función de la temperatura de reacción (400-800 °C) y en función del tiempo de reacción (800 °C / 24 h). Los catalizadores de platino soportados sobre ceria mostraron las mejores propiedades catalíticas, especialmente en las pruebas de estabilidad, donde la desactivación fue muy baja. Por el contrario, la estabilidad catalítica de las muestras soportadas en alúmina fue considerablemente menor, debido tanto a la formación de residuos de carbón como al sinterizado de partículas de Pt. Por medio diferentes técnicas de caracterización (TEM, Quimisorción de CO), se evidenció una fuerte interacción Pt-Ceria, la cual ayudó a prevenir la aglomeración de partículas de Pt durante la reacción, además de promover la generación de sitios activos interfaciales. Ambas características se proponen como las responsables de las mejores propiedades catalíticas presentadas por los catalizadores Pt/CeO2. El efecto del precursor del Pt depende de la naturaleza del soporte. En ceria, las especies de cloro beneficiaron la generación de sitios vacantes de oxígeno así como la reducción superficial de la ceria; ambas características son responsables de las propiedades anti-coque en el sistema Pt/CeO2, por lo tanto, estas impactaron positivamente en el desempeño catalítico de la muestra Pt(-cl)/Ce. Por el contrario, en la alúmina, estas especies cloradas aparentemente promovieron el sinterizado de partículas y los depósitos de carbono durante la reacción, lo cual afectó el desempeño catalítico de la muestra Pt(-cl)/Al.

scholarly journals Performance Analysis of TiO2-Modified Co/MgAl2O4 Catalyst for Dry Reforming of Methane in a Fixed Bed Reactor for Syngas (H2, CO) Production

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3347
Author(s):  
Arslan Mazhar ◽  
Asif Hussain Khoja ◽  
Abul Kalam Azad ◽  
Faisal Mushtaq ◽  
Salman Raza Naqvi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Fixed Bed Reactor ◽  
Dry Reforming Of Methane ◽  
Catalyst Stability ◽  
Feed Ratio ◽  
Catalyst Loading ◽  
Impregnation Method

Co/TiO2–MgAl2O4 was investigated in a fixed bed reactor for the dry reforming of methane (DRM) process. Co/TiO2–MgAl2O4 was prepared by modified co-precipitation, followed by the hydrothermal method. The active metal Co was loaded via the wetness impregnation method. The prepared catalyst was characterized by XRD, SEM, TGA, and FTIR. The performance of Co/TiO2–MgAl2O4 for the DRM process was investigated in a reactor with a temperature of 750 °C, a feed ratio (CO2/CH4) of 1, a catalyst loading of 0.5 g, and a feed flow rate of 20 mL min−1. The effect of support interaction with metal and the composite were studied for catalytic activity, the composite showing significantly improved results. Moreover, among the tested Co loadings, 5 wt% Co over the TiO2–MgAl2O4 composite shows the best catalytic performance. The 5%Co/TiO2–MgAl2O4 improved the CH4 and CO2 conversion by up to 70% and 80%, respectively, while the selectivity of H2 and CO improved to 43% and 46.5%, respectively. The achieved H2/CO ratio of 0.9 was due to the excess amount of CO produced because of the higher conversion rate of CO2 and the surface carbon reaction with oxygen species. Furthermore, in a time on stream (TOS) test, the catalyst exhibited 75 h of stability with significant catalytic activity. Catalyst potential lies in catalyst stability and performance results, thus encouraging the further investigation and use of the catalyst for the long-run DRM process.

scholarly journals Novel Nickel- and Magnesium-Modified Cenospheres as Catalysts for Dry Reforming of Methane at Moderate Temperatures

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1066 ◽  
Author(s):  
Bogdan Samojeden ◽  
Marta Kamienowska ◽  
Armando Izquierdo Colorado ◽  
Maria Elena Galvez ◽  
Ilona Kolebuk ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Temperature Programmed Desorption ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Temperature Programmed Reduction ◽  
Fly Ashes ◽  
Coal Fly Ashes ◽  
Temperature Programmed ◽  
Mg Content

Cenospheres from coal fly ashes were used as support in the preparation of Ni–Mg catalysts for dry reforming of methane. These materials were characterized by means of XRD, H2-temperature-programmed reduction (H2-TPR), CO2-temperature-programmed desorption (CO2-TPD), and low-temperature nitrogen sorption techniques. The cenosphere-supported catalysts showed relatively high activity and good stability in the dry reforming of methane (DRM) at 700 °C. The catalytic performance of modified cenospheres was found to depend on both Ni and Mg content. The highest activity at 750 °C and 1 atm was observed for the catalyst containing 30 wt % Mg and 10, 20, and 30 wt % Ni, yielding to CO2 and CH4 conversions of around 95%.

scholarly journals Preparation, Characterization, and Activity of Pd/PSS-Modified Membranes in the Low Temperature Dry Reforming of Methane with and without Addition of Extra Steam

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 518
Author(s):  
Cecilia Mateos-Pedrero ◽  
Miguel A. Soria ◽  
Antonio Guerrero-Ruíz ◽  
Inmaculada Rodríguez-Ramos
Keyword(s):  
Low Temperature ◽  
Flow Reactor ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Porous Stainless Steel ◽  
Pd Membrane ◽  
Continuous Flow Reactor ◽  
Oxidation In Air ◽  
H2 Yield ◽  
Water Gas

The external surface of a commercial porous stainless steel (PSS) was modified by either oxidation in air at varying temperatures (600, 700, and 800 °C) or coating with different oxides (SiO2, Al2O3, and ZrO2). Among them, PSS-ZrO2 appears as the most suitable carrier for the synthesis of the Pd membrane. A composite Pd membrane supported on the PSS-ZrO2 substrate was prepared by the electroless plating deposition method. Supported Ru catalysts were first evaluated for the low-temperature methane dry reforming (DRM) reaction in a continuous flow reactor (CR). Ru/ZrO2-La2O3 catalyst was found to be active and stable, so it was used in a membrane reactor (MR), which enhances the methane conversions above the equilibrium values. The influence of adding H2O to the feed of DRM was investigated over a Ru/ZrO2-La2O3 catalyst in the MR. Activity results are compared with those measured in a CR. The addition of H2O into the feed favors other reactions such as Water-Gas Shift (RWGS) and Steam Reforming (SR), which occur together with DRM, resulting in a dramatic decrease of CO2 conversion and CO production, but a marked increase of H2 yield.

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