Structured Raney Nickel Catalysts for Liquid‐Phase Hydrogenation

Wolf, Aurel; Turek, Thomas; Mleczko, Lesław

doi:10.1002/ceat.201600111

Cited by 13 publications

(13 citation statements)

References 29 publications

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“…Besides RANEY s nickel is used in a large number of industrial processes mainly focused on hydrogenation. 149,150 Furthermore, particularly remarkable is the recent development of nickel based homogeneous or organo-nickel chemistry. 151 p-Aminophenol is an important intermediate in the preparation of several analgesic and antipyretic drugs.…”

Section: (H) Nickel (Ni)-mofmsmentioning

confidence: 99%

Metal organic frameworks as precursors for the manufacture of advanced catalytic materials

Oar‐Arteta

Wezendonk

Sun

et al. 2017

Mater. Chem. Front.

281

175

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Section: (H) Nickel (Ni)-mofmsmentioning

confidence: 99%

Metal organic frameworks as precursors for the manufacture of advanced catalytic materials

Oar‐Arteta

Wezendonk

Sun

et al. 2017

Mater. Chem. Front.

281

175

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“…However, the use of structured or cellular Raney‐type alloys is not very common to date. Only simple geometries such as diffusion‐coated wire meshes or plasma spray‐coated monolith structures have been achieved so far …”

Section: Introductionmentioning

confidence: 99%

“…[2] One way to overcome the limited heat transfer capacity of classical fixed bed reactors is to use a catalyst support with solid connections of significant cross-section in the form of an open cellular metal foam [3] or simple monolithic structures. [4,5] Significant effort has been put into the understanding of the wall heat transfer coefficient [6,7] optimizing the thermal design of such structures. Because reproducing stochastic foams is only possible to a fairly limited degree, [8,9] current efforts are mainly undertaken to develop metallic periodic open cell structures (POCS) for chemical reactors fabricated via the selective electron beam melting process (SEBM).…”

Section: Introductionmentioning

confidence: 99%

“…Only simple geometries such as diffusion-coated wire meshes or plasma spray-coated monolith structures have been achieved so far. [4,5,19] In our previous work, we demonstrated that Cu-Al Raney-type alloys, which are additively processable, can form catalytically active materials for the methanol synthesis when leached with NaOH solutions after fabrication. [20] Based on our previously achieved knowledge about the processing of copper-based high aluminum alloys, [21] we will demonstrate in this contribution the successful preparation of an additively manufactured, Cu-70Al alloy-based, periodic open cellular structure (POCS) that is catalytically active in methanol synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Periodic Open Cellular Raney‐Copper Catalysts Fabricated via Selective Electron Beam Melting

Wolf

et al. 2020

Adv Eng Mater

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Herein, the possibility of generating Raney‐Copper catalysts with high geometric complexity is demonstrated. For this, periodic open cellular structures (POCS) composed of a highly brittle Al–Cu alloy containing 29.4 at% copper are fabricated by selective electron beam melting (SEBM) for application in chemical reaction engineering. After selective leaching of aluminum in an NaOH solution, the POCS show a core–shell structure with a nanoporous copper surface layer and a solid core. The fabrication and dealloying processes as well as the microstructure are studied. Moreover, the SEBM‐processed Raney‐type copper catalysts show a high catalytic activity in methanol synthesis.

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“…3) Sorbitol. Annual production of sorbitol is estimated to be 700,000 tonnes by hydrogenation of glucose over Raney nickel catalyst [204,205]. However, leaching of nickel is a common problem in the catalytic system.…”

Section: )5-hydroxymethylfurfural (Hmf) Hmf Has Been Examined Extenmentioning

confidence: 99%

Biomass conversion and upgrading over carbon catalyst

Chen¹

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Biomass conversion and upgrading are promising solutions for energy shortage and environment problems. Located in Southeast Asia, Singapore is surrounded by abundant biomass resource in its neighboring countries. However, most of the biomass feedstock is underutilization. Cellulose, which represents the most abundant biomass resource, has been examined over noble metal supported carbon catalyst as an example of biomass conversion. As a Johnson Matthey (JM) supported program, we examined cellulose hydrogenation over Pt/AC produced from JM by the trial-and-error method. After tuning the reaction conditions, a sorbitol yield up to 25% is obtained. We also proposed a novel and effective catalyst optimization method which can further improve the sorbitol yield to 50% by further reducing the Pt/AC in ethylene glycol. This catalytic performance improvement is attributed to the effect of particle size according to XRD and TEM results. CV scans of the Pt/AC indicate that the decline of platinum's oxidation and reduction activity after EG treatment may suppress the side reactions during cellulose hydrogenation, hence improve sorbitol yield. Ruthenium has been proved as an ideal catalyst in biomass conversion, especially for cellulose hydrogenation. However, studies of such reactions are extremely time-consuming due to the numerous side reactions and the complexity of interactions among reaction parameters. In this work, we introduced multivariate analysis method for the study of cellulose hydrogenation. The effect of temperature, hydrogen pressure, catalyst amount and ruthenium loading were comprehensively explored based on a response surface design III (RSD). Among all the 26 hydrogenation reactions, the highest sorbitol yield of 71.9% was obtained. The reaction data was then used to produce a regression model which shows strong statistical significance and high accuracy. Though this model, we evaluated the effectiveness of all the reaction parameters. It was found that ruthenium loading and temperature were the two main driving forces for sorbitol yield. High sorbitol yield could only be obtained while ruthenium loading and temperature were well tuned. The synergistic effects among reaction parameters were well presented with the help of contour plots and surface plots generated from the model. Lastly, a prediction formula according to the reaction data was constructed to predict the sorbitol yield under other reaction conditions. Sorbitol, which is the main product of cellulose hydrogenation, has been examined over sulfonated carbon catalysts as an example of biomass upgrading. The sulfonated carbon catalysts show high catalytic activity towards the synthesis of isosorbide from sorbitol, with a yield up to 60% with negligible performance loss for five consecutive runs. The sulfuric groups are identified as the main active sites for sorbitol dehydration. The physical and chemical properties of the catalysts are evaluated by advanced and extensive characterization techniques, such as XRD, TEM, SEM, BET, FTIR, EA, EDAX, TG...

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Structured Raney Nickel Catalysts for Liquid‐Phase Hydrogenation

Cited by 13 publications

References 29 publications

Metal organic frameworks as precursors for the manufacture of advanced catalytic materials

Metal organic frameworks as precursors for the manufacture of advanced catalytic materials

Periodic Open Cellular Raney‐Copper Catalysts Fabricated via Selective Electron Beam Melting

Biomass conversion and upgrading over carbon catalyst

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