Catalytic combustion of methane, methanol, and ethanol in microscale combustors with Pt/ZSM-5 packed beds

Deng, Chen; Yang, Weijuan; Zhou, Junhu; Liu, Zikun; Wang, Yang; Cen, Kefa

doi:10.1016/j.fuel.2015.02.018

Cited by 33 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent experimental investigations include the study of methane conversion over Pt-based catalysts with alumina, 28 ceria and zirconia supports 29 and a comparison of methane, methanol and ethanol reforming over Pt/ZSM-5 at various stoichiometries. 30 The effect of oxygen coverage on methane activation was investigated by Weng et al 10 using Pt and palladium (Pd) catalysts. The amount of previous work on methane oxidation over Pt suggests that the system is well-suited for the current study of the accuracy of methods for the generation of heterogeneous reactions mechanisms.…”

Section: Data Set Selectionmentioning

confidence: 99%

“…The studies include the validation of the CH 4 /O 2 /Pt mechanisms of Deutschmann et al and Zerkle et al, while Mantzaras et al studied the ignition behavior of fuel lean mixtures using parabolic and elliptical calculation methods and compared with experimental data. Recent experimental investigations include the study of methane conversion over Pt-based catalysts with alumina, ceria and zirconia supports and a comparison of methane, methanol and ethanol reforming over Pt/ZSM-5 at various stoichiometries . The effect of oxygen coverage on methane activation was investigated by Weng et al using Pt and palladium (Pd) catalysts.…”

Section: Data Set Selectionmentioning

confidence: 99%

See 1 more Smart Citation

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Kraus

Lindstedt

2017

J. Phys. Chem. C

View full text Add to dashboard Cite

A systematic approach for the development of heterogeneous mechanisms is applied and evaluated for the catalytic partial oxidation of methane over platinum (Pt) and rhodium (Rh). The derived mechanisms are self-consistent and based on a reaction class-based framework comprising variational transition state theory (VTST) and two-dimensional collision theory for the calculation of pre-exponential factors with barrier heights obtained using the unity bond index-quadratic exponential potential (UBI-QEP) method. The surface chemistry is combined with a detailed chemistry for the gas phase and the accuracy of the approach is evaluated over Pt for a wide range of stoichiometries (0.3 ≤ φ ≤ 4.0), pressures (2 ≤ P (bar) ≤ 16) and residence times. It is shown that the derived mechanism can reproduce experimental data with an accuracy comparable to the prevalent collision theory approach and without the reliance on experimental data for sticking coefficients. The derived mechanism for Rh shows encouraging agreement for a similar set of conditions and the robustness of the approach is further evaluated by incorporating partial updates via more accurate DFT determined barrier heights. Substantial differences are noted for some channels (e.g. where reaction progress is strongly influenced by early transition states) though the impact on the overall agreement with experimental data is moderate for the current systems. Remaining discrepancies are explored using sensitivity analyses to establish key parameters. The study suggests that the overall framework is well-suited for the efficient generation of heterogeneous reaction mechanisms, that it can serve to identify key parameters where high accuracy ab initio methods are required and that it permits the inclusion of such updates as part of a gradual refinement process.

show abstract

Section: Data Set Selectionmentioning

confidence: 99%

Section: Data Set Selectionmentioning

confidence: 99%

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Kraus

Lindstedt

2017

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…In the past, several supported and unsupported solid catalysts have been extensively investigated. Pt [7,8] Rh [9,10] and Pd [11][12][13][14] are the best known transition metals to have been widely studied for the reaction. Among these three metals supported on γ-Al 2 O 3 under fuel-rich conditions, the order of the catalytic activity for the metals has been ranked as: Pd > Rh > Pt [15].…”

Section: Introductionmentioning

confidence: 99%

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

et al. 2019

View full text Add to dashboard Cite

Catalyst screening of γ-Al2O3-supported, single-metal and bimetallic catalysts revealed several bimetallic catalysts with activities for partial combustion of methane greater than a benchmark Pt/γ-Al2O3 catalyst. A cost analysis of those catalysts identified that the (2 wt%Cr + 3 wt% Ru)/γ-Al2O3 catalyst, denoted as 2Cr3Ru/Al2O3, was about 17.6 times cheaper than the benchmark catalyst and achieved a methane conversion of 10.50% or 1.6 times higher than the benchmark catalyst based on identical catalyst weights. In addition, various catalyst characterization techniques were performed to determine the physicochemical properties of the catalysts, revealing that the particle size of RuO2 became smaller and the binding energy of Ru 3d also shifted toward a lower energy. Moreover, the operating conditions (reactor temperature and O2/CH4 ratio), stability, and reusability of the 2Cr3Ru/Al2O3 catalyst were investigated. The stability test of the catalyst over 24 h was very good, without any signs of coke deposition. The reusability of the catalyst for five cycles (6 h for each cycle) was noticeably excellent.

show abstract

“…The use of an efficient heterogeneous catalyst can significantly reduce the light-off temperature and minimize the pollutant emission. The methane combustion at a low temperature is a promising technology for converting methane to carbon dioxide and water, which is very beneficial from the view of environmental protection and energy saving. , Generally, precious metals (Pd, Pt, Rh, and Au) supported on various metal oxides, − transition metal oxides (Mn, Co, Fe, Cr, and Cu), − spinels (AB 2 O 4 ), − perovskites (ABO 3 ), , and hexaaluminates (AB x Al 12– x O 19 ) , have been considered for methane combustion. Among the precious metals studied for lean methane catalytic combustion, Pd shows excellent activity and thermal stability, which has received significant consideration in recent years.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts

Akbari

Alavi

Rezaei

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The various morphologies (wire, rod, tube, and flower) of the MnO x nanocrystalline catalysts were prepared using the hydrothermal and solution methods, and the prepared samples were evaluated for catalytic combustion of methane. The results revealed that the wire-like MnO2 catalyst showed an excellent performance in the methane combustion reaction. The light-off temperature related to 90% of the CH4 conversion was about 400 °C for the wire-like sample, which was higher than those obtained in other catalysts with different morphologies. The influence of the different synthesis factors including the hydrothermal temperature, pH value, aging time, and calcination temperature on the textural properties and activity of the catalysts was investigated. The obtained results confirmed that varying the preparation factors had a considerable effect on the structure and activity of the catalysts. The sample synthesized under the specific conditions (T hydro. = 240 °C, pH = 3, aging time = 24 h, and T cal. = 400 °C) displayed the highest efficiency in the methane catalytic combustion process. Furthermore, the effect of various operating parameters including the gas hourly space velocity, feed (O2/CH4) ratio, pretreatment condition, type of solvents, and catalytic stability in the existence of CO2 and steam was studied on the catalytic performance. The results revealed that the catalyst stability of the optimal MnO2 sample reduced to some extent with the concurrent concentration of CO2 and water vapor in the reactant feed stream. In the presence of CO2 or/and H2O, the initial CH4 activity at 350 °C was below 20%. However, the long-term stability showed high stability under the dry feed at 450 °C for 50 h.

show abstract

Catalytic combustion of methane, methanol, and ethanol in microscale combustors with Pt/ZSM-5 packed beds

Cited by 33 publications

References 40 publications

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts

Contact Info

Product

Resources

About

Catalytic combustion of methane, methanol, and ethanol in microscale combustors with Pt/ZSM-5 packed beds

Cited by 33 publications

References 40 publications

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Microkinetic Mechanisms for Partial Oxidation of Methane over Platinum and Rhodium

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO2 Nanowire Catalysts

Contact Info

Product

Resources

About

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts