The Experts below are selected from a list of 353307 Experts worldwide ranked by ideXlab platform
Yi Cheng - One of the best experts on this subject based on the ideXlab platform.
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bimetallic ni fe total Methanation catalyst for the production of substitute natural gas under high pressure
Fuel, 2013Co-Authors: Dayong Tian, Zhihong Liu, Huiliang Shi, Weixiong Pan, Yi ChengAbstract:Abstract The bimetallic Ni–Fe catalysts used in CO total-Methanation reaction were prepared by the impregnation method on γ-Al 2 O 3 support for the production of substitute natural gas (SNG). The catalysts were characterized by N 2 physisorption measurements, field-emission scanning electron microscopy (FE-SEM), and H 2 temperature-programmed reduction (H 2 -TPR). The Methanation performance under the industrial total-Methanation conditions (0.1–3.0 MPa, H 2 /CO = 3.0–3.1) was studied in detail using Ni–Fe/γ-Al 2 O 3 as a heterogeneous catalyst. The results showed that the addition of Fe to the catalyst can effectively improve the catalytic activity of Ni/γ-Al 2 O 3 , while the high activity of bimetallic Ni–Fe catalyst was attributed to the quality of Ni–Fe alloy in the catalyst in terms of the experimental results of H 2 -TPR. The sample with appropriate Ni/Fe molar ratio of about 3 exhibited the highest CO conversion (near 100% at 225–550 °C) and the highest CH 4 selectivity (over 99% at 300–450 °C) under the reaction pressure of 3.0 MPa. Furthermore, based on the systematic study of catalyst components, MgO in the catalyst can increase the reduction temperature of nickel oxide on the support. The silicon species as an impurity in the support play a negative role in the catalytic activity, especially for the CH 4 selectivity.
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total Methanation of syngas to synthetic natural gas over ni catalyst in a micro channel reactor
Fuel, 2012Co-Authors: Zhihong Liu, Bozhao Chu, Xuli Zhai, Yong Jin, Yi ChengAbstract:Abstract Methanation reaction from syngas to synthetic natural gas (SNG) has been successfully implemented over Ni catalyst in a micro-channel reactor with high conversion and selectivity in milliseconds contact time. A new method called improved thermal spray to manufacture the metal-ceramics complex substrate as catalyst support was presented. The substrate demonstrated dual functions, i.e., the superior heat conduction as metal and stable catalyst coating on it as ceramics (e.g., Al2O3). The experiments verified that the fall-off proportion of the catalyst can be neglected after the plates experienced Methanation reaction and strong vibration in ultrasonic cleaner. Meanwhile, the catalyst coatings on the walls of micro-channel reactor showed high activity and stability, having the excellent catalytic performance for Methanation reaction in micro-channel reactors and the reliability in long-term use as well. At the temperature of 550 °C and the pressure of 30 atm, CO conversion and CH4 selectivity can remain above 98% and 92%, respectively, at a high GHSV of 71,000 h−1, where the corresponding residence time is only about 50 ms. Extensive characterizations of these Ni catalyst plates were also made to get a better understanding of the catalytic performance. The results of XRD, SEM, TEM and TPR characterizations demonstrated that Ni catalysts prepared in this work did not show any sign of deactivation after being used in the micro-channel system. It is expected that the Methanation reactor technique based on the metal-ceramics complex substrate as the catalyst support in (micro-)channel reactors would open opportunities for the reliable engineering applications of either distributed or mass production of SNG from syngas.
Martin Agelin-chaab - One of the best experts on this subject based on the ideXlab platform.
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A critical review of synthetic natural gas production techniques and technologies
Journal of Natural Gas Science and Engineering, 2020Co-Authors: Andre Bolt, Ibrahim Dincer, Martin Agelin-chaabAbstract:Abstract This paper provides a critical review of renewable and non-renewable synthetic natural gas production processes, technologies, and catalysts used to enhance the Methanation processes. By completing this review, researchers have successfully provided a road-map for synthetic natural gas production research, as well as describing the current landscape for synthetic natural gas production, particularly within Canada and the United States. In addition, the tropose recycle energy efficient Methanation process proved to be highly beneficial due to the fact that this process was considered to be energy-efficient, economically viable, and was capable of producing a yield of up to 98%. Furthermore, nickel was considered to be a highly favourable choice as a catalyst to facilitate the Methanation process, given its high activity and selectivity ranking and low cost. Moreover, the fixed-bed reactor systems were determined to be a common choice for synthetic natural gas production due to their simple and effective design. However, honeycomb reactors and microchannel reactors were considered more favourable in regards to catalysts exposure within the rectors.
Zhihong Liu - One of the best experts on this subject based on the ideXlab platform.
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bimetallic ni fe total Methanation catalyst for the production of substitute natural gas under high pressure
Fuel, 2013Co-Authors: Dayong Tian, Zhihong Liu, Huiliang Shi, Weixiong Pan, Yi ChengAbstract:Abstract The bimetallic Ni–Fe catalysts used in CO total-Methanation reaction were prepared by the impregnation method on γ-Al 2 O 3 support for the production of substitute natural gas (SNG). The catalysts were characterized by N 2 physisorption measurements, field-emission scanning electron microscopy (FE-SEM), and H 2 temperature-programmed reduction (H 2 -TPR). The Methanation performance under the industrial total-Methanation conditions (0.1–3.0 MPa, H 2 /CO = 3.0–3.1) was studied in detail using Ni–Fe/γ-Al 2 O 3 as a heterogeneous catalyst. The results showed that the addition of Fe to the catalyst can effectively improve the catalytic activity of Ni/γ-Al 2 O 3 , while the high activity of bimetallic Ni–Fe catalyst was attributed to the quality of Ni–Fe alloy in the catalyst in terms of the experimental results of H 2 -TPR. The sample with appropriate Ni/Fe molar ratio of about 3 exhibited the highest CO conversion (near 100% at 225–550 °C) and the highest CH 4 selectivity (over 99% at 300–450 °C) under the reaction pressure of 3.0 MPa. Furthermore, based on the systematic study of catalyst components, MgO in the catalyst can increase the reduction temperature of nickel oxide on the support. The silicon species as an impurity in the support play a negative role in the catalytic activity, especially for the CH 4 selectivity.
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total Methanation of syngas to synthetic natural gas over ni catalyst in a micro channel reactor
Fuel, 2012Co-Authors: Zhihong Liu, Bozhao Chu, Xuli Zhai, Yong Jin, Yi ChengAbstract:Abstract Methanation reaction from syngas to synthetic natural gas (SNG) has been successfully implemented over Ni catalyst in a micro-channel reactor with high conversion and selectivity in milliseconds contact time. A new method called improved thermal spray to manufacture the metal-ceramics complex substrate as catalyst support was presented. The substrate demonstrated dual functions, i.e., the superior heat conduction as metal and stable catalyst coating on it as ceramics (e.g., Al2O3). The experiments verified that the fall-off proportion of the catalyst can be neglected after the plates experienced Methanation reaction and strong vibration in ultrasonic cleaner. Meanwhile, the catalyst coatings on the walls of micro-channel reactor showed high activity and stability, having the excellent catalytic performance for Methanation reaction in micro-channel reactors and the reliability in long-term use as well. At the temperature of 550 °C and the pressure of 30 atm, CO conversion and CH4 selectivity can remain above 98% and 92%, respectively, at a high GHSV of 71,000 h−1, where the corresponding residence time is only about 50 ms. Extensive characterizations of these Ni catalyst plates were also made to get a better understanding of the catalytic performance. The results of XRD, SEM, TEM and TPR characterizations demonstrated that Ni catalysts prepared in this work did not show any sign of deactivation after being used in the micro-channel system. It is expected that the Methanation reactor technique based on the metal-ceramics complex substrate as the catalyst support in (micro-)channel reactors would open opportunities for the reliable engineering applications of either distributed or mass production of SNG from syngas.
Ziyi Zhong - One of the best experts on this subject based on the ideXlab platform.
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recent advances in Methanation catalysts for the production of synthetic natural gas
RSC Advances, 2015Co-Authors: Jiajian Gao, Qing Liu, Bin Liu, Ziyi ZhongAbstract:Methanation of coal-or biomass-derived carbon oxides for production of synthetic natural gas (SNG) is gaining considerable interest due to energy issues and the opportunity of reducing greenhouse gases by carbon dioxide conversion. The key component of the Methanation process is the catalyst design. Ideally, the catalyst should show high activity at low temperatures (200-300 degrees C) and high stability at high temperatures (600-700 degrees C). In the past decades, various Methanation catalysts have been investigated, among which transition metals including Ni, Fe, Co, Ru, Mo, etc. dispersed on metal oxide supports such as Al2O3, SiO2, TiO2, ZrO2, CeO2 etc. have received great attention due to their relatively high catalytic activity and selectivity. Furthermore, over the past few years, great efforts have been made both in Methanation catalysts development and reaction mechanism investigation. Here we provide a comprehensive review to these most advancements, covering the reaction thermodynamics, mechanism and kinetics, the effects of catalyst active components, supports, promoters and preparation methods, hoping to outline the pathways for the future Methanation catalysts design and development for SNG production.
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enhanced catalytic performances of ni al2o3 catalyst via addition of v2o3 for co Methanation
Applied Catalysis A-general, 2014Co-Authors: Qing Liu, Youjun Liu, Ziyi ZhongAbstract:Highly active and coking resistant Ni-V2O3/Al2O3 catalysts were prepared by co-impregnation method for CO and CO2 Methanation. The influence of vanadium oxide addition on catalyst structure, distribution and reducibility of Ni species, morphology and surface characteristics, was investigated in detail. Compared to the catalyst without vanadium, the Ni-V2O3/Al2O3 catalysts showed significant improvement in the activity, thermal stability, and resistance to coke formation in CO Methanation. In addition, these catalysts also showed high activities for CO2 Methanation at both atmospheric and 2.0 MPa pressures. It was found that Ni3V2O8 was formed during the calcination of the Ni-V2O3/Al2O3 catalysts, which led to the formation of smaller Ni particle sizes (ca. 3.0 nm) as compared to the case without vanadium oxide addition. The higher catalytic activity over the Ni-V2O3/Al2O3 catalysts for CO Methanation was mainly due to the larger H-2 uptake, the higher Ni dispersion as well as the smaller metallic Ni nanoparticles. The oxidation-reduction cycle of V2O3 could increase the oxygen vacancies, which enhanced the dissociation of CO2 by-product and generated surface oxygen intermediates, thus preventing carbon deposition on the Ni particles in CO Methanation. (C) 2014 Elsevier B.V. All rights reserved.
Chakib Bouallou - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen production from natural gas: Auto-Thermal Reforming and CO 2 capture
Chemical Engineering Transactions, 2014Co-Authors: De Castro Joao, Bouallou Chakib, Joao Castro, Rodrigo Rivera-tinoco, Rivera-tinoco Rodrigo, Chakib BouallouAbstract:We study the hydrogen production by the Auto-Thermal Reforming (ATR) process coupled with a CO 2 capture using an MonoEthanolAmine (MEA) aqueous solution and the Methanation process as means of hydrogen purification technique. Under several fixed assumptions on operating conditions, we found that the large-scale production of 99mol% pure hydrogen can be reached and depends strongly on the operating temperature at the ATR and the CO 2 removed in the capture step. High purity hydrogen streams derive from a high carbon capture in the absorption column that avoids further parasitic Methanation reactions.
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Parametric study of an efficient renewable power-to-substitute-natural-gas process including high-temperature steam electrolysis
International Journal of Hydrogen Energy, 2014Co-Authors: Myriam De Saint Jean, Pierre Baurens, Chakib BouallouAbstract:Power-to-Substitute Natural Gas processes are investigated to offer solutions for renewable energy storing or transportation. In the present study, an original Power-to-SNG process combining high-temperature steam electrolysis and CO2 Methanation is implemented and simulated. A reference process is firstly defined, including a specific modelling approach of the electrolysis and a Methanation modelling including a kinetic law. The process also integrates a unit to clean the gas from residual CO2, H2 and H2O for gas network injection. Having set all the units, simulations are performed with ProsimPlus 3™ software for a reference case where the electrolyser and the Methanation reactors are designed. The reference case allows to produce 67.5 Nm3/h of SNG with an electrical energy consumption of 14.4 kW h/Nm3. The produced SNG satisfies specifications required for network injection. From this reference process, two sensitivity analyses on electrolysis and Methanation working points and on external parameters and constraints are considered. As a main result, we observe that the reference case maximises both process efficiency and SNG production when compared with other studied cases.
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Study of the efficiency of a ht power-to-gas process
Chemical Engineering Transactions, 2014Co-Authors: Myriam De Saint Jean, Pierre Baurens, Chakib BouallouAbstract:Power-to-Gas processes are investigated since they offer solutions for renewable energy storing and transportation. In the present study, an original Power-to-Substitute Natural Gas (SNG) process combining high-temperature steam electrolysis and CO2 Methanation is designed and simulated. A specific modelling approach of the electrolysis based on experimental measurements is used, and a Methanation modelling involving a kinetic law is also introduced. Both of these modelling are then integrated into the whole process simulation as well as a unit for residual CO2, H2 and H2O gas cleaning. Having set all the process units, simulation is performed for a reference case where the electrolyser and the Methanation reactors are designed. This case allows to produce 2.7 Nm3SNG/h/m2SOEC with an electrical-to-HHV fuel efficiency equalling 74.5 %, whereas current low-electrolysis processes show an HHV efficiency near 60 %. The produced SNG meets the specifications required for network injection. A sensitivity analysis has been made around the working point conditions of the electrolyser and the Methanation units. From this study, we observed that no parameter set allows to have higher values of both process efficiency and SNG production than in the reference case..
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Methanation catalytic reactor
Comptes Rendus Chimie, 2014Co-Authors: Hana� Er-rbib, Chakib BouallouAbstract:Storing renewable electricity in a natural gas grid is a new approach for seasonal storage. Using the existing natural gas infrastructure, a chemical energy source (methane) is stored efficiently, distributed and made available for use as required. Thus, the main step in the storage process is CO Methanation. Modelling of an isothermal Methanation catalytic reactor based on a kinetic scheme was carried out with Aspen plus™software in a temperature range between 520 and 600 K and a H2/CO molar ratio of 3, in the presence of CO2and steam. The model was validated by comparing simulation results with experimental ones. The maximum relative error is 10.87%. The effects of temperature, pressure and CO2addition in feed gas (syngas) on CO conversion and the outlet gas composition were carefully investigated.
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Modeling and simulation of CO Methanation process for renewable electricity storage
Energy, 2014Co-Authors: Hana� Er-rbib, Chakib BouallouAbstract:In this paper, a new approach of converting renewable electricity into methane via syngas (a mixture of CO and H2) and CO Methanation is presented. Surplus of electricity is used to electrolyze H2O and CO2 to H2 and CO by using a SOEC (Solid Oxide Electrolysis Cell). Syngas produced is then converted into methane. When high consumption peaks appear, methane is used to produce electricity. The main conversion step in this process is CO Methanation. A modeling of catalytic fixed bed Methanation reactor and a design of Methanation unit composed of multistage adiabatic reactors are carried out using Aspen plus™ software. The model was validated by comparing the simulated results of gas composition (CH4, CO, CO2 and H2) with industrial data. In addition, the effects of recycle ratio on adiabatic reactor stages, outlet temperature, and H2 and CO conversions are carefully investigated. It is found that for storing 10MW of renewable electricity, Methanation unit is composed of three adiabatic reactors with recycle loop and intermediate cooling at 553K and 1.5MPa. The Methanation unit generates 3778.6kg/h of steam at 523.2K and 1MPa (13.67MW).
