Nano-sized Ni/(CaO) x -(Al 2 O 3 ) y catalysts for steam pre-reforming of ethane and propane in natural gas: The role of CaO/Al 2 O 3 ratio to enhance conversion efficiency and resistance to coke formation

Keshavarz, Ahmad Reza; Soleimani, Mansooreh

doi:10.1016/j.jngse.2017.05.019

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…El consumo de hidrógeno es mayor para los OM CaCe, y por ende, la reducibilidad calculada en comparación con los OM MgCe, incluso, dicho consumo es superior al esperado estequiométricamente según el contenido de especies reducibles para estos óxidos. El sobreconsumo de H2 se debe a la existencia de CaCO3 el cual se puede descomponer durante el tratamiento térmico reductivo [153,163]. No obstante, también se debe considerar que los óxidos OM CaCe pueden tener alta dispersión del NiO causada aparentemente por la presencia del CaO en la estructura del OM, lo que permite que las especies de Ni 2+ se encuentren altamente dispersas y con una mayor disposición para ser reducidas a Ni 0 [159,163].…”

Section: Temperatura Programada De Reducción (Tpr-h2)unclassified

“…El sobreconsumo de H2 se debe a la existencia de CaCO3 el cual se puede descomponer durante el tratamiento térmico reductivo [153,163]. No obstante, también se debe considerar que los óxidos OM CaCe pueden tener alta dispersión del NiO causada aparentemente por la presencia del CaO en la estructura del OM, lo que permite que las especies de Ni 2+ se encuentren altamente dispersas y con una mayor disposición para ser reducidas a Ni 0 [159,163]. De igual manera, se debe tener en cuenta que las especies de NiO en la serie OM CaCe se reducen a menor temperatura, por ende, son más fácilmente reducibles.…”

Section: Temperatura Programada De Reducción (Tpr-h2)unclassified

“…El incremento en la actividad de los OM a baja temperaturas es atribuido al carácter básico aportada por el Ca el Mg, intensificando la quimisorición del CO2 por medio de la disminución de la energía de activación sobre la superficie de los OM, lo que a su vez eleva la conversión del CO2 [134,163,183]. Bajo estas condiciones de reacción la diferencia más notable entre los OM es la temperatura a la cual se alcanzó el máximo de conversión que para el caso de lo OM CaCe fue 400°C y 300 °C para los OM MgCe, por otra parte, es difícil adjudicar algún efecto del CeO2 sobre la actividad catalítica de los OM debido a que no se pueden diferenciar las curvas de reacción de una misma serie de OM.…”

Section: Evaluación Catalíticaunclassified

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Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Ahmad

Younis

Shawabkeh

et al. 2017

Catalysis Communications

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Los resultados de la actividad catalítica muestran que los todos los OM presentan una mayor conversión de CO2 a bajas temperatura en comparación con el sólido de referencia de Ni/γAl2O3 y una selectividad del 100% a la formación de CH4 bajo las condiciones de WHSV= 60000 mLg -1 h -1 , el incremento de la velocidad espacial genera una fuerte disminución en la conversión de CO2 y un aumento en la selectividad a CO, sin embargo, se aprecia una conversión mayor a medida que el contenido del promotor es mayor. Los ensayos de estabilidad indican que lo OM MgCe son estable y no presentan formación de depósitos de coque, en contraste, a los OM CaCe se forman depósitos de carbono, pero en menor medida en el OM con promotor.

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Section: Temperatura Programada De Reducción (Tpr-h2)unclassified

Section: Evaluación Catalíticaunclassified

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Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Ahmad

Younis

Shawabkeh

et al. 2017

Catalysis Communications

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“…Figure 6b shows that the conversions of CH 4 and CO 2 of Ni-Ca-4 catalyst are 52.0 and 96.7%, respectively, and that the H 2 /CO value of synthesis gas is closer to 1, so the comprehensive performance of Ni-Ca-4 catalyst is better than the others. 25,26 Combined with the catalyst characterization, excellent performance of Ni-Ca-4 Figure 7 discusses the effect of the auxiliaries on catalyst performance. Relevant reports showed that the active component Ni in the supported catalyst unmodified by the promoter would be subjected to serious sintering.…”

Section: Edx-mapping Analysismentioning

confidence: 78%

Effect of Ca Promoter on the Structure, Performance, and Carbon Deposition of Ni-Al₂O₃ Catalyst for CO₂-CH₄ Reforming

Wang

et al. 2020

ACS Omega

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Ni-Al2O3 catalyst with different Ca abundance for CO2-CH4 reforming was prepared by the solution combustion method. By some mature characterization methods, such as XRD, H2-TPR, EDX mapping, TEM, TPH and TG-DTG technologies, and the reforming experiment, the effect of Ca content on the structure, reforming performance, and carbon deposition of Ni-Al2O3 catalyst was investigated. Results showed that the grain size of active component Ni on the 4 wt % Ca-modified catalyst (Ni-Ca-4) was small (13.67 nm), presenting good dispersion, and that Ni and Ca elements were well distributed on the support, which was more conducive to the CO2-CH4 reforming. Evaluation results showed that activity of Ni-Ca-4 was higher than the others, with CH4 and CO2 conversions of 52.0 and 96.7%, respectively, and H2/CO ratio close to unit. Carbon deposition proposed that the amount of carbon deposited on the surface of Ni-Ca-4 was lower (18%), and the type of carbon was attributed to amorphous carbon, indicating that 4 wt % Ca-promoted catalyst presented better anticarbon deposition performance.

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“…Numerous studies exist in literature and each one delves into a specific area of analysis. Experimental studies that deal with C1-C2 [10][11][12], C3-C4 [9,13], and higher hydrocarbons [14][15][16][17] have already postulated that modeling studies are necessary in order to properly comprehend the system dynamics that involve the interaction of several subsystems. As these subsystems operate continuously and sequentially, such modeling studies can serve as the basis for an advanced control and scaled-up design that will ensure an economically feasible H 2 production.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Control of a Coupled Reforming/Combustor System for the Production of H2 via Hydrocarbon-Based Fuels

et al. 2020

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The present work aims to provide insights into the dynamic operation of a coupled reformer/combustion unit that can utilize a variety of saturated hydrocarbons (HCs) with 1–4 C atoms towards H2 production (along with CO2). Within this concept, a preselected HC-based feedstock enters a steam reforming reactor for the production of H2 via a series of catalytic reactions, whereas a sequential postprocessing unit (water gas shift reactor) is then utilized to increase H2 purity and minimize CO. The core unit of the overall system is the combustor that is coupled with the reformer reactor and continuously provides heat (a) for sustaining the prevailing endothermic reforming reactions and (b) for the process feed streams. The dynamic model as it is initially developed, consists of ordinary differential equations that capture the main physicochemical phenomena taking place at each subsystem (energy and mass balances) and is compared against available thermodynamic data (temperature and concentration). Further on, a distributed control scheme based on PID (Proportional–Integral–Derivative) controllers (each one tuned via Ziegler–Nichols/Z-N methodology) is applied and a set of case studies is formulated. The aim of the control scheme is to maintain the selected process-controlled variables within their predefined set-points, despite the emergence of sudden disturbances. It was revealed that the accurately tuned controllers lead to (a) a quick start-up operation, (b) minimum overshoot (especially regarding the sensitive reactor temperature), (c) zero offset from the desired operating set-points, and (d) quick settling during disturbance emergence.

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Nano-sized Ni/(CaO) x -(Al 2 O 3 ) y catalysts for steam pre-reforming of ethane and propane in natural gas: The role of CaO/Al 2 O 3 ratio to enhance conversion efficiency and resistance to coke formation

Cited by 11 publications

References 26 publications

Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Effect of Ca Promoter on the Structure, Performance, and Carbon Deposition of Ni-Al₂O₃ Catalyst for CO₂-CH₄ Reforming

Dynamic Modeling and Control of a Coupled Reforming/Combustor System for the Production of H2 via Hydrocarbon-Based Fuels

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Nano-sized Ni/(CaO) x -(Al 2 O 3 ) y catalysts for steam pre-reforming of ethane and propane in natural gas: The role of CaO/Al 2 O 3 ratio to enhance conversion efficiency and resistance to coke formation

Cited by 11 publications

References 26 publications

Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under atmospheric pressure

Effect of Ca Promoter on the Structure, Performance, and Carbon Deposition of Ni-Al2O3 Catalyst for CO2-CH4 Reforming

Dynamic Modeling and Control of a Coupled Reforming/Combustor System for the Production of H2 via Hydrocarbon-Based Fuels

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Effect of Ca Promoter on the Structure, Performance, and Carbon Deposition of Ni-Al₂O₃ Catalyst for CO₂-CH₄ Reforming