Low temperature dry reforming of methane over Pt–Ni–Mg/ceria–zirconia catalysts

Elsayed, Nada H.; Roberts, Nathan; Joseph, Babu; Kuhn, John N.

doi:10.1016/j.apcatb.2015.05.021

Cited by 124 publications

(83 citation statements)

References 56 publications

(84 reference statements)

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“…Moreover, remarkable conversions of methane and CO2 were observed only above 500 °C [13]. Some studies claimed the catalysts to be active in DRM at very low temperature (400 °C [51] or 450 °C [50]). However, in those studies more beneficial conditions for high catalytic activity compared to this study were applied (lower WHSV, higher content of active sites, or usage of noble metals).…”

Section: Catalyst Performance In the Drm Reactionmentioning

confidence: 99%

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Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5 wt %) supported on Mg-Al mixed oxide. The aim was to minimize carbon deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation. The solids were characterized using N 2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al 2 O 3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550-800 • C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 • C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.

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Section: Catalyst Performance In the Drm Reactionmentioning

confidence: 99%

“…It should be noted that DRM requires high temperatures to convert the reactants to syngas. According to the literature, the reaction starts at 350 °C, referred to by the thermodynamic calculations [49,50]. Moreover, remarkable conversions of methane and CO2 were observed only above 500 °C [13].…”

Section: Catalyst Performance In the Drm Reactionmentioning

confidence: 99%

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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“…An attempt to fit the XANES spectra of the samples as linear combination of reference spectra was unsuccessful, which is not uncommon for non-stoichiometric iron oxides. Hence, to establish the oxidation state of iron in the samples, the approach of Wilke has been applied [50]. In this method, the position of the pre-edge features is determined for the reference compounds and plotted as a function of a formal oxidation state (or oxidation state measured independently, e.g., by Mössbauer spectroscopy, as demonstrated by Wilke et al [50]) and fitting is used to obtain the chemical state for the unknown material.…”

Section: X-ray Absorption Near Edge Structure (Xanes) Spectra Comparementioning

confidence: 99%

“…Hence, to establish the oxidation state of iron in the samples, the approach of Wilke has been applied [50]. In this method, the position of the pre-edge features is determined for the reference compounds and plotted as a function of a formal oxidation state (or oxidation state measured independently, e.g., by Mössbauer spectroscopy, as demonstrated by Wilke et al [50]) and fitting is used to obtain the chemical state for the unknown material. Figure 16 shows the position of the pre-edge peaks for all materials plotted as a function of Fe 3+ /Fe total.…”

Section: X-ray Absorption Near Edge Structure (Xanes) Spectra Comparementioning

confidence: 99%

Commemorative Issue in Honor of Professor Emeritus Calvin H. Bartholomew in Anticipation of His 75th Birthday

2019

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Sir Isaac Newton said that if he had seen further than others, it was because he was standing on the shoulders of giants. Within the field of heterogeneous catalysts, Calvin H. Bartholomew, Professor Emeritus of Chemical Engineering at Brigham Young University (BYU), is one of those giants. As a few selected highlights from his career, Dr. Bartholomew has authored several definitive reviews on catalyst deactivation, with special emphasis on sulfur poisoning, carbon deposition, and sintering, for which he championed the use of generalized power law expressions (GPLE) to model the deactivation. GPLE's contain a limiting, steady-state value of activity that is more accurate compared tothan the more common assumption of a simple power law expression, which takes the final activity of the catalyst as zero. He has been active in both cobalt and iron based Fischer-Tropsch catalyst research. More recently, he developed the slit pore model to characterize the pore size distribution of mesoporous catalytic support materials, that which is more accurate than conventional models. Finally, as a major contribution to the field, he published a leading handbook and textbook, Fundamentals of Industrial Catalytic Processes, with his long-time collaborator, Dr. Robert Farrauto. This compilation highlights and complements many of Professor Bartholomew's contributions to the field. The nine chapters comprising the book were written by former students, collaborators, colleagues, and respected peers. Keyvanloo et al.'s study on Fischer-Tropsch catalysis (Chapter 1) honors Professor Bartholomew's extensive contributions to this area. Hallac et al.'s spectroscopic study on iron-based water gas shift catalysts (Chapter 2) hearkens back to Professor Bartholomew's graduate work with iron. Ha et al.'s contribution on nickel catalysts for (dry) methane reforming and carbon deactivation (Chapter 3) go back relate to Dr. Bartholomew's early work on both nickel and methane reforming. Türks et al.'s work on carbon dioxide methanation on nickel catalysts (Chapter 4) builds on these major themes. Martinelli et al.'s study (Chapter 5) continues the steam reforming theme, but with methanol as the reactant on platinum catalysts supported on sodium-modified yttrium stabilized zirconia. The contribution by Xiang et al. (Chapter 6), whose corresponding author is Dr. Bartholomew's friend, Bob Farrauto, echoes some of his earliest work on environmental catalysts. Tu et al.'s contribution on palladium catalysts supported on titania for hydrogen peroxide production (Chapter 7) also touches onrelates to themes of this metal and support in Dr. Bartholomew's research. Finally, Seeburg et al.'s paper on methane combustion catalyst stability (Chapter 8) and Ruelas-Leyva and Fuentes work on chiral catalyst deactivation (Chapter 9) fit with Dr. Bartholomew's consistent theme of catalyst deactivation. In summary, this book covers much of the breadth and points to the depth of Professor Bartholomew's illustrious career. Dr. Bartholomew has taught and mentored student...

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“…[13][14][15][16][17][18][19] Also, deposition of carbon over the catalyst, one of the main causes of deactivation, is extremely depending on the nickel particle properties and the interaction with the support. [20][21][22][23][24][25] In this sense, the use of mesoporous supports has been proposed as good alternative for the improvement of catalytic performance. 26,27 Typically presenting a very high surface area and a variable size of the porosity, 28 these kind of materials could also play a role controlling the size of the metallic particles.…”

Section: Introductionmentioning

confidence: 99%

Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

2017

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A series of four Ni catalysts supported on SBA-15 and on a high SiO surface area have been prepared by modified impregnation (ImU) and deposition-precipitation (DP) methods. The catalysts have been extensively characterized, including in situ XAS (bulk sensitive) and XPS (surface sensitive) techniques, and their catalytic activities evaluated in the dry reforming reaction of methane (DRM). The combined use of XPS and XAS has allowed us to determine the location of nickel particles on each catalyst after reduction at high temperature (750 °C). Both Ni/SiO-DP and Ni/SBA-15-DP catalysts yield well-dispersed and homogeneous metallic phases mainly located in the mesoporosity of both supports. On the contrary, the Ni/SiO-ImU and Ni/SBA-15-ImU catalysts present a bimodal distribution of the reduced nickel phase, with nickel metallic particles located out and into the mesoporous structure of SiO or the SBA-15 channels. The Ni/SBA-15-DP catalyst was found the most stable and performing system, with a very low level of carbon deposition, about an order of magnitude lower than the equivalent ImU catalyst. This outstanding performance comes from the confinement of small and homogeneous nickel particles in the mesoporous channels of SBA-15, which, in strong interaction with the support, are resistant to sintering and coke deposition during the demanding reaction conditions of DRM.

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Low temperature dry reforming of methane over Pt–Ni–Mg/ceria–zirconia catalysts

Cited by 124 publications

References 56 publications

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Commemorative Issue in Honor of Professor Emeritus Calvin H. Bartholomew in Anticipation of His 75th Birthday

Nickel Particles Selectively Confined in the Mesoporous Channels of SBA-15 Yielding a Very Stable Catalyst for DRM Reaction

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