Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

Dai, Xiaoping; Cheng, Jie; Li, Zhanzhao; Liu, Mengzhao; Ma, Yangde; Zhang, Xin

doi:10.1016/j.ces.2016.07.011

Cited by 62 publications

(20 citation statements)

References 55 publications

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“…LaMnO 3 ). [45][46][47][48] In terms of ethane ODH, Elbadawi and coworkers recently described the reduction kinetics of supported vanadium oxide under a cyclic scheme. [49] However, the reduction kinetics of bulk mixed oxides in CL-ODH of ethane has not been investigated to date.…”

Section: Author Manuscriptmentioning

confidence: 99%

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

et al. 2019

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Section: Author Manuscriptmentioning

confidence: 99%

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

et al. 2019

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“…This is because during the first reduction step, apart from producing oxygen vacancies in the solid oxygen carrier, a phase change is generally not involved. Different models have been used to describe the conversion profiles of such noncatalytic gas-solid thermochemical reactions [32][33][34][35][36][37]. The mechanism of solid-state reduction kinetics of CeO 2 -Fe 2 O 3 systems was found to vary depending on the amount of Fe 2 O 3 [28].…”

Section: Introductionmentioning

confidence: 99%

Solid-State Redox Kinetics of CeO2 in Two-Step Solar CH4 Partial Oxidation and Thermochemical CO2 Conversion

Nair

Abanades

2021

Catalysts

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The CeO2/CeO2−δ redox system occupies a unique position as an oxygen carrier in chemical looping processes for producing solar fuels, using concentrated solar energy. The two-step thermochemical ceria-based cycle for the production of synthesis gas from methane and solar energy, followed by CO2 splitting, was considered in this work. This topic concerns one of the emerging and most promising processes for the recycling and valorization of anthropogenic greenhouse gas emissions. The development of redox-active catalysts with enhanced efficiency for solar thermochemical fuel production and CO2 conversion is a highly demanding and challenging topic. The determination of redox reaction kinetics is crucial for process design and optimization. In this study, the solid-state redox kinetics of CeO2 in the two-step process with CH4 as the reducing agent and CO2 as the oxidizing agent was investigated in an original prototype solar thermogravimetric reactor equipped with a parabolic dish solar concentrator. In particular, the ceria reduction and re-oxidation reactions were carried out under isothermal conditions. Several solid-state kinetic models based on reaction order, nucleation, shrinking core, and diffusion were utilized for deducing the reaction mechanisms. It was observed that both ceria reduction with CH4 and re-oxidation with CO2 were best represented by a 2D nucleation and nuclei growth model under the applied conditions. The kinetic models exhibiting the best agreement with the experimental reaction data were used to estimate the kinetic parameters. The values of apparent activation energies (~80 kJ·mol−1 for reduction and ~10 kJ·mol−1 for re-oxidation) and pre-exponential factors (~2–9 s−1 for reduction and ~123–253 s−1 for re-oxidation) were obtained from the Arrhenius plots.

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“…It also shows good oxygen transfer ability ascribing to the nonstoichiometric oxygen existed in the bulk which can host a large number of oxygen vacancies for oxygen diffusion at reacted temperatures. Dai et al demonstrated the feasibility of perovskite LaFeO 3 for methane partial oxidation to produce syngas. He et al studied the effects of Sr substitution in La 1 − x Sr x FeO 3 for the production of syngas by methane and demonstrated the positive effects of Sr substitution for the generating of oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the relationship between electronic properties and reactivity of 3DOM LaFe _{1 −
x} Co _x O ₃ for methane reforming to produce syngas

Zhao

Chen

et al. 2019

Int J Energy Res

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Summary Chemical looping steam methane reforming (CL‐SMR) provides a promising pathway to reform methane and to jointly generate high‐quality syngas and hydrogen. The key issue is the designing of oxygen carriers (OCs) with high reactivity, good selectivity, and excellent recyclability. The high temperature required for chemical looping reaction also presents challenges in terms of producing stable and anticarbon deposition OCs. Here, we report a three‐dimensional ordered macroporous (3DOM) Co‐Fe doping perovskites as OCs for CL‐SMR, in which the active perovskite phases are equipped with well‐ordered wall skeleton in three dimensions. Multiple of characterization techniques such as H2‐TPR, XRD, SEM, and XPS were used to characterize the physicochemical properties of OCs. Combining with the tests on fixed‐bed reactor, we demonstrated that the 3DOM structures are beneficial to reduce the mass diffusion resistance and to supply more active sites for fuel conversion. The synergetic effects of metal Fe‐Co promote the reactivity by increasing the reaction rate and reducing the reaction temperature. These experiment results are further explored by using the first‐principle calculations. Differences in the atomic charges and electronic densities show that there are more negative oxygen ions in the doping cells. The substitution of Co increased the transition intensity of Co3d‐O2p orbit, and more electrons were excited near Fermi level. These deeper predictions insight into the synergistic mechanism will provide meaningful information for the selecting and designing of oxygen carriers in subsequent study.

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Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

Cited by 62 publications

References 55 publications

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

Solid-State Redox Kinetics of CeO2 in Two-Step Solar CH4 Partial Oxidation and Thermochemical CO2 Conversion

Investigation of the relationship between electronic properties and reactivity of 3DOM LaFe _{1 −
x} Co _x O ₃ for methane reforming to produce syngas

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Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

Cited by 62 publications

References 55 publications

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

Reduction Kinetics of Perovskite Oxides for Selective Hydrogen Combustion in the Context of Olefin Production

Solid-State Redox Kinetics of CeO2 in Two-Step Solar CH4 Partial Oxidation and Thermochemical CO2 Conversion

Investigation of the relationship between electronic properties and reactivity of 3DOM LaFe 1 − x Co x O 3 for methane reforming to produce syngas

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Investigation of the relationship between electronic properties and reactivity of 3DOM LaFe _{1 −
x} Co _x O ₃ for methane reforming to produce syngas