Promotional Effect of Gold on the WGS Activity of Alumina-Supported Copper-Manganese Mixed Oxides

Tabakova, T.; Ivanov, Ivan B.; Karakirova, Yordanka; Karashanova, Daniela; Venezia, Anna Maria; Petrova, P.; Avdeev, G.; Kolentsova, Elitsa N.; Ivanov, K.

doi:10.3390/catal8110563

Cited by 12 publications

(4 citation statements)

References 34 publications

(20 reference statements)

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“…The high activity of this catalyst system makes it capable of practical usages, primarily due to economic viability as it consists of 80% alumina [118]. Sagata et al investigated the effect of aluminum oxide and the pore size of the support on the catalytic activity during the low-temperature WGS reaction over Cu catalyst [119]. They concluded that by decreasing the mesopore size of Cu/Al 2 O 3 , the catalytic activity increased only when the steam/carbon (S/C) ratio was 2.2, whereas the catalytic activity increased in the S/C ratio of 4.6 by increasing the mesopore size [119].…”

Section: Type Of Metal Oxide Supportmentioning

confidence: 99%

“…Sagata et al investigated the effect of aluminum oxide and the pore size of the support on the catalytic activity during the low-temperature WGS reaction over Cu catalyst [119]. They concluded that by decreasing the mesopore size of Cu/Al 2 O 3 , the catalytic activity increased only when the steam/carbon (S/C) ratio was 2.2, whereas the catalytic activity increased in the S/C ratio of 4.6 by increasing the mesopore size [119]. One of the important considerations in an industrial sulfur tolerant WGS process is that the reaction conditions, not only catalysts, dictate many of the outcomes such as improvements in production capacity, decreasing production costs, and change in the catalytic activity [120,121].…”

Section: Type Of Metal Oxide Supportmentioning

confidence: 99%

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A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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The water-gas shift reaction (WGSR) is an intermediate reaction in hydrocarbon reforming processes, considered one of the most important reactions for hydrogen production. Here, water and carbon monoxide molecules react to generate hydrogen and carbon dioxide. From the thermodynamics aspect, pressure does not have an impact, whereas low-temperature conditions are suitable for high hydrogen selectivity because of the exothermic nature of the WGSR reaction. The performance of this reaction can be greatly enhanced in the presence of suitable catalysts. The WGSR has been widely studied due do the industrial significance resulting in a good volume of open literature on reactor design and catalyst development. A number of review articles are also available on the fundamental aspects of the reaction, including thermodynamic analysis, reaction condition optimization, catalyst design, and deactivation studies. Over the past few decades, there has been an exceptional development of the catalyst characterization techniques such as near-ambient x-ray photoelectron spectroscopy (NA-XPS) and in situ transmission electron microscopy (in situ TEM), providing atomic level information in presence of gases at elevated temperatures. These tools have been crucial in providing nanoscale structural details and the dynamic changes during reaction conditions, which were not available before. The present review is an attempt to gather the recent progress, particularly in the past decade, on the catalysts for lowtemperature WGSR and their structural properties, leading to new insights that can be used in the future for effective catalyst design. For the ease of reading, the article is divided into subsections based on metals (noble and transition metal), oxide supports, and carbon-based supports. It also aims at providing a brief overview of the reaction conditions by including a table of catalysts with synthesis methods, reaction conditions, and key observations for a quick reference. Based on our study of literature on noble metal catalysts, atomic Pt substituted Mn 3 O 4 shows almost full CO conversion at 260°C itself with zero methane formation. In the case of transition metals group, the inclusion of Cu in catalytic system seems to influence the CO conversion significantly, and in some cases, with CO conversion improvement by 65% at 280°C. Moreover, mesoporous ceria as a catalyst support shows great potential with reports of full CO conversion at a low temperature of 175°C.

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Section: Type Of Metal Oxide Supportmentioning

confidence: 99%

Section: Type Of Metal Oxide Supportmentioning

confidence: 99%

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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“…Favorable properties of transition metal oxides and gold nanoparticles have been combined to prepare gold-based catalysts using alumina-supported Cu–Mn mixed oxides (Tabakova et al, 2018). Sample characterization by several techniques [X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR)] before and after WGS tests evidenced that the beneficial effect of gold promotion was related to CO activation and enhanced CuO reducibility.…”

Section: Recent Achievements In the Field Of Gold-catalyzed Wgs Reactionmentioning

confidence: 99%

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Tabakova

2019

Front. Chem.

Self Cite

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Over the past three decades, supported gold nanoparticles have demonstrated outstanding properties and continue to attract the interest of the scientific community. Several books and comprehensive reviews as well as numerous papers cover a variety of fundamental and applied aspects specific to gold-based catalyst synthesis, characterization by different techniques, relationship among catalyst support features, electronic and structural properties of gold particles, and catalytic activity, reaction mechanism, and theoretical modeling. Among the Au-catalyzed reactions targeting environmental protection and sustainable energy applications, particular attention is paid to pure hydrogen production. The increasing demands for high-purity hydrogen for fuel cell systems caused a renewed interest in the water–gas shift reaction. This well-known industrial process provides an attractive way for hydrogen generation and additional increase of its concentration in the gas mixtures obtained by processes utilizing coal, petroleum, or biomass resources. An effective step for further elimination of CO traces from the reformate stream after water–gas shift unit is the preferential CO oxidation. Developing highly active, stable, and selective catalysts for these two reactions is of primary importance for efficient upgrading of hydrogen purity in fuel cell applications. This review aims to extend the existing knowledge and understanding of the properties of gold-based catalysts for H 2 clean-up reactions. In particular, new approaches and strategies for design of high-performing and cost-effective formulations are addressed. Emphasis is placed on efforts to explore appropriate and economically viable supports with complex composition prepared by various synthesis procedures. Relevance of ceria application as a support for new-generation WGS catalysts is pointed out. The role of the nature of support in catalyst behavior and specifically the existence of an active gold–support interface is highlighted. Long-term stability and tolerance toward start-up/shutdown cycling are discussed. Very recent advances in catalyst design are described focusing on structured catalysts and microchannel reactors. The latest mechanistic aspects of the water–gas shift reaction and preferential CO oxidation over gold-based catalysts from density functional theory calculations are noted because of their essential role in discovering novel highly efficient catalysts.

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“…Non-Hg organometallic catalysts, especially Au-based catalysts [3,4], have emerged with excellent catalytic performances. In recent years, great efforts have been put on exploring the high activity as well as the preparation methods for Au-based catalysts [5][6][7][8][9]. For instance, a 100% benzene conversion was achieved for the Au-based catalyst [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Novel Magnetically Retrievable Nanocomposite with Au Nanocatalysts for Hydration Reaction

Dai

et al. 2019

Catalysts

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Developing efficient catalysts with good recyclability is of great importance for its practical applications. In this study, a novel magnetically retrievable nanocomposite (Au-SiO2@Fe3O4-RGO) was synthesized for catalyzing hydration reaction. Active Au nanoparticles are deposited on core-shell SiO2@Fe3O4, which are further supported by a two-dimensional reduced graphene oxide (RGO) platform. The prepared Au-SiO2@Fe3O4-RGO was proven to be efficient as well as recyclable. An excellent catalytic performance, with 97% yield towards the hydration of phenylacetylene, was achieved for the catalyst in dioxane. Remarkably, the catalyst can be readily recycled through magnetic separation and achieved superior catalyst recovery and stability after seven cycles without any metal leaching. This work provides a strategy to fabricate recyclable and durable catalysts for industrial applications.

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Promotional Effect of Gold on the WGS Activity of Alumina-Supported Copper-Manganese Mixed Oxides

Cited by 12 publications

References 34 publications

A review of recent advances in water-gas shift catalysis for hydrogen production

A review of recent advances in water-gas shift catalysis for hydrogen production

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Synthesis of a Novel Magnetically Retrievable Nanocomposite with Au Nanocatalysts for Hydration Reaction

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