In situ X-ray investigations on AgIn/SiO2 hydrogenation catalysts

Haaß, Frank; Bron, Michael; Fueß, H.; Claus, Peter

doi:10.1016/j.apcata.2006.10.031

Cited by 21 publications

(18 citation statements)

References 25 publications

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“…Monometallic Ag catalysts have been investigated for the hydrogenation of crotonaldehyde, 137,138,327 acrolein, 200,328,329 and cinnamaldehyde 241,330 in reactor studies (Fig. 18b).…”

Section: Ag and Ag Alloysmentioning

confidence: 99%

Guidelines to Achieving High Selectivity for the Hydrogenation of α,β-Unsaturated Aldehydes with Bimetallic and Dilute Alloy Catalysts: A Review

et al. 2020

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Selective hydrogenation of α,ß-unsaturated aldehydes to unsaturated alcohols is a challenging class of reactions, yielding valuable intermediates for the production of pharmaceuticals, perfumes, and flavorings. On monometallic heterogeneous catalysts, the formation of the unsaturated alcohols is thermodynamically disfavored over the saturated aldehydes. Hence, new catalysts are required to achieve the desired selectivity. Herein, the literature of three major research areas in catalysis is integrated as a step toward establishing the guidelines for enhancing the selectivity: reactor studies of complex catalyst materials at operating temperature and pressure; surface science studies of crystalline surfaces in ultrahigh vacuum; and first-principles modeling using density functional theory calculations. Aggregate analysis shows that bimetallic and dilute alloy catalysts significantly enhance the selectivity to the unsaturated alcohols compared to monometallic catalysts. This comprehensive review focuses primarily on the role of different metal surfaces as well as the factors that promote the adsorption of the unsaturated aldehyde via its C=O bond, most notably by electronic modification of the surface and formation of the electrophilic sites. Furthermore, challenges, gaps, and opportunities are identified to advance the rational design of efficient catalysts for this class of reactions, including the need for systematic studies of catalytic processes, theoretical modeling of complex materials, and model studies under ambient pressure and temperature.

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“…Monometallic Ag catalysts have been investigated for the hydrogenation of crotonaldehyde, 137,138,327 acrolein, 200,328,329 and cinnamaldehyde 241,330 in reactor studies (Fig. 18b).…”

Section: Ag and Ag Alloysmentioning

confidence: 99%

Guidelines to Achieving High Selectivity for the Hydrogenation of α,β-Unsaturated Aldehydes with Bimetallic and Dilute Alloy Catalysts: A Review

et al. 2020

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“…However, in situ EXAFS studies performed recently for the first time under industrially relevant hydrogenation conditions with acrolein − H 2 as feed showed a fingerprint at the Ag Kedge EXAFS, which can be explained by partial oxygen coverage of the catalyst surface [114]. However, in situ EXAFS studies performed recently for the first time under industrially relevant hydrogenation conditions with acrolein − H 2 as feed showed a fingerprint at the Ag Kedge EXAFS, which can be explained by partial oxygen coverage of the catalyst surface [114].…”

Section: Influence Of a Second Metal On Selectivitymentioning

confidence: 99%

Regioselective Hydrogenations

Claus¹,

Önal²

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Generalities in Regioselectivity with Heterogeneous Catalysts Definitions General Factors Determining Selectivity Reaction Engineering and Selectivity Selective Hydrogenation of α, β‐Unsaturated Aldehydes Physicochemical Basics and Reaction Mechanism Metal Specificity and Structure Sensitivity Influence of Support Materials, Zeolites and Surface Modifiers Influence of a Second Metal on Selectivity Regioselective Hydrogenation in the Presence of Green Solvents Kinetic Modeling Selective Hydrogenation of Polyenes Selective Hydrogenation of Ketones Selective Hydrogenation of Polycyclic Aromatics and Derivatives Selective Hydrogenation of Nitroaromatics

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“…6 ] solution (Reanal, Hungary) in a ratio of 1 cm 3 g -1 to ensure incipient wetness. Prior to impregnation, the supports were dried overnight at 450°C, then the aqueous Pt-salt solution containing Pt in the required amount was added to the support.…”

Section: Methodsmentioning

confidence: 99%

“…From the 1960s extensive investigations resulted in many widely utilized catalytic applications. As long as the effect of tin as a second metal, for example, on the catalytic properties of Pt/Al 2 O 3 has been reported in numerous studies [3], the promoting effect of the neighboring indium received much less attention [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Acetic acid hydroconversion over mono- and bimetallic indium doped catalysts supported on alumina and silicas of various textures

et al. 2014

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Consecutive hydroconversion of acetic acid (AA) to ethanol was compared over monometallic and novel bimetallic (containing In as guest metal) catalysts on alumina and silica supports (inter alia highly ordered SBA-15) of different porosity and pore structure. The transformation was studied in a fixed bed, flow-through reactor in the temperature range of 220-380°C using hydrogen flow at 21 bar total pressure. AA hydroconversion activity of Cu and Pt catalysts and the yield of selectively produced alcohol were increased drastically by applying SBA-15 as highly ordered, mesoporous silica support instead of alumina. The most active nickel catalysts do not allow the selective addition of hydrogen to carbon-oxygen bonds independently of supports producing mainly CH 4 ; however, indium doping can completely eliminate the hydrodecarbonylation activity as found in earlier studies. The textural properties of studied silica supports of various textures such as SBA-15, CAB-O-SIL, and Grace Sylobead have a profound impact on the catalytic performance of Ni and Ni 2 In particles.

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In situ X-ray investigations on AgIn/SiO2 hydrogenation catalysts

Cited by 21 publications

References 25 publications

Guidelines to Achieving High Selectivity for the Hydrogenation of α,β-Unsaturated Aldehydes with Bimetallic and Dilute Alloy Catalysts: A Review

Guidelines to Achieving High Selectivity for the Hydrogenation of α,β-Unsaturated Aldehydes with Bimetallic and Dilute Alloy Catalysts: A Review

Regioselective Hydrogenations

Acetic acid hydroconversion over mono- and bimetallic indium doped catalysts supported on alumina and silicas of various textures

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