Selective conversion of coconut oil to fatty alcohols in methanol over a hydrothermally prepared Cu/SiO<sub>2</sub> catalyst without extraneous hydrogen

Wu, Liubi; Li, Lulu; Li, Bolong; Zhao, Chen

doi:10.1039/c7cc01126a

Cited by 51 publications

(25 citation statements)

References 22 publications

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“…The three calcined Cu/SiO 2 samples all showed strong peaks at bindinge nergies (BE) of 935.4 and 942.9 eV,a ssigned to Cu 2p 3/2 and 2p!3d satellite (*) Cu 2+ + (Figure 5a). [22] The peaks at ak inetic energy (KE)o f916.5 eV for calcined Cu/SiO 2 -DPU and Cu/SiO 2 -IM in the Cu LMM spectra (Figure 5b)were also attributedt oCu 2+ + ,inline with the results obtained by using Cu XPS. Meanwhile, the left-shifted peak of calcined Cu/SiO 2 -DPA( BE = 915.8 eV) compared to BE = 916.5 eV was probablyb ecause of the presence of copper www.chemcatchem.org (Cu 2+ + )p hyllosilicate,b yc ontrast the main specieso nC u/SiO 2 -IM andC u/SiO 2 -DPU were CuO nanoparticles.…”

Section: Characterizationo Ft He Three Cu/sio 2 Samplessupporting

confidence: 80%

“…Cu X‐ray photoelectron spectroscopy (XPS) and Cu LMM analysis were performed to elucidate the chemical states of Cu (Figure and Table S2). The three calcined Cu/SiO 2 samples all showed strong peaks at binding energies (BE) of 935.4 and 942.9 eV, assigned to Cu 2p 3/2 and 2p→3d satellite (*) Cu 2+ (Figure a) . The peaks at a kinetic energy (KE) of 916.5 eV for calcined Cu/SiO 2 ‐DPU and Cu/SiO 2 ‐IM in the Cu LMM spectra (Figure b) were also attributed to Cu 2+ , in line with the results obtained by using Cu XPS.…”

Section: Resultsmentioning

confidence: 99%

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Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites

Zhao

2018

ChemCatChem

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Hydrogen is an important sustainable resource, and here we report a catalytic route for the direct production of hydrogen (with a purity of 95 %) and dimethoxylmethane (DMM) from supercritical methanol over a Cu/SiO2 catalyst prepared by deposition–precipitation with ammonia (DPA) at 240°C in a one‐pot process. The procedure starts with methanol dehydrogenation to hydrogen and formaldehyde at the interface of the Cu2O⋅SiO2–Cu0 particle mixture, and subsequently, the formaldehyde intermediate condenses with substantial methanol to form DMM in the liquid phase. The Cu0, CuO, and chrysocolla species are inactive for hydrogen generation from methanol, and the intrinsic active species for methanol decomposition is the Cu2O⋅SiO2–Cu0 nanoparticle interface, which is produced from the hydrogen reduction of Cu2Si2O5(OH)2 or from the methanol reduction of Cu−O−Si moieties. A correlation between the structure and activity on reduced Cu/SiO2 (DPA) suggested that only Cu0 was not active, but the combined Cu0 and Cu+ sites with interfaces on SiO2 with an optimal Cu+/Cu0 ratio of 1.56 were highly active for methanol dehydrogenation and subsequent condensation steps. The developed new catalytic system offers a facile and atom‐economical way to generate pure hydrogen (almost CO free) from liquid methanol that can be used in fuel cell and hydrogen‐involved biomass reactions.

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Section: Characterizationo Ft He Three Cu/sio 2 Samplessupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites

Zhao

2018

ChemCatChem

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“…Heterogeneous Cu catalysts have been mainly applied in C—O bond derived reactions, such as methanol synthesis from CO/CO 2 hydrogenation, [ 165‐169 ] (reverse) water‐gas shift reactions (WGS) [ 170‐171 ] and ester hydrogeantion, [ 172‐173 ] due to their moderate capability for activation of C—O bond and H 2 .…”

Section: Particle Size Effect In Metal Catalysismentioning

confidence: 99%

A Review on Particle Size Effect in Metal‐Catalyzed Heterogeneous Reactions

Wang

2020

Chin. J. Chem.

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Size of metal nanoparticles (NPs) plays decisive roles in metal-catalyzed heterogeneous reactions, due to the drastic variation of the geometric and electronic properties of metal NPs with size. Along with the development of controlled catalyst synthesis, tremendous efforts have been devoted to understanding the nature of the particle size effect. In particular, identification of the individual roles of size-dependent geometric and electronic effects on metal-catalyzed reactions is essential, but remains challenging since they are tightly hybridized together with particle size variation. In this review, we first discuss the fundamentals of the size-dependent geometric and electronic properties of metal NPs and their crucial roles in catalysis in general. Then we summarize the previous representative studies of the particle size effect, metal-by-metal, in heterogeneous catalysis. We highlighted the extension of particle size effect to ultrafine cluster and single-atom catalysts, the new frontiers in heterogeneous catalysis. In the followings, we further introduce the recent advances in disentangling the size-dependent geometric and electronic effects and unveiling their individual contributions to catalysis. Finally, we discuss the challenges and perspectives of investigations on the size effect in metal catalysis for the future studies. Mr. Hengwei Wang (left) received his B.Sc. degree from School of Chemistry and Materials Science, University of Science and Technology of China (USTC) in 2015. Then he Joined Professor Junling Lu's research group at USTC to pursue his doctorate in Physical Chemistry. His research focuses on atomically-precise design and synthesis of metal nanocatalysts for heterogeneous catalysis and unravelling their structure-reactivity relations at atomic scale. Prof. Junling Lu (right) received his Ph.D. degree from Institute of Physics, Chinese Academy of Sciences under the supervision of Prof. Hong-Jun Gao in 2007. During his Ph.D. studies, he visited Prof. Hans-Joachim Freund's group at Chemical Physics Department, Fritz-Haber-Institute, Max Planck Society as an exchange student in 2004-2006. After graduation, he spent three years in Prof. Peter C Stair's group at Northwestern University and then about two and a half years in Dr. Jeffrey W. Elam's group at Argonne National Laboratory as a Postdoc. In March 2013, he joined USTC as a Professor. His current research interest is atomically-precise design of a new generation of advanced catalysts through a combined wet-chemistry and atomic layer deposition (ALD) approach.

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“…Except for metal sulfides and noble metal catalysts, the sulfur-free non-noble metal catalysts are promising in heterogeneous catalysis. It is found that non-noble metals (e.g., Ni, Co, Cu) are active in deoxygenation of fatty acids and natural oil to hydrocarbons [47,134,135]. Santillan-Jimenez et al investigated the continuous catalytic hydrogenation of model compound and algal lipids to fuel-like hydrocarbons using Ni-Al layered double hydroxide [136].…”

Section: Catalytic Hydroprocessing Of Extracted Algal Oilmentioning

confidence: 99%

Catalytic Thermochemical Conversion of Algae and Upgrading of Algal Oil for the Production of High-Grade Liquid Fuel: A Review

Zhou

2020

Catalysts

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The depletion of fossil fuel has drawn growing attention towards the utilization of renewable biomass for sustainable energy production. Technologies for the production of algae derived biofuel has attracted wide attention in recent years. Direct thermochemical conversion of algae obtained biocrude oil with poor fuel quality due to the complex composition of algae. Thus, catalysts are required in such process to remove the heteroatoms such as oxygen, nitrogen, and sulfur. This article reviews the recent advances in catalytic systems for the direct catalytic conversion of algae, as well as catalytic upgrading of algae-derived oil or biocrude into liquid fuels with high quality. Heterogeneous catalysts with high activity in deoxygenation and denitrogenation are preferable for the conversion of algae oil to high-grade liquid fuel. The paper summarized the influence of reaction parameters and reaction routes for the catalytic conversion process of algae from critical literature. The development of new catalysts, conversion conditions, and efficiency indicators (yields and selectivity) from different literature are presented and compared. The future prospect and challenges in general utilization of algae are also proposed.

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Selective conversion of coconut oil to fatty alcohols in methanol over a hydrothermally prepared Cu/SiO₂ catalyst without extraneous hydrogen

Cited by 51 publications

References 22 publications

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites

A Review on Particle Size Effect in Metal‐Catalyzed Heterogeneous Reactions

Catalytic Thermochemical Conversion of Algae and Upgrading of Algal Oil for the Production of High-Grade Liquid Fuel: A Review

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Selective conversion of coconut oil to fatty alcohols in methanol over a hydrothermally prepared Cu/SiO2 catalyst without extraneous hydrogen

Cited by 51 publications

References 22 publications

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu+/Cu0 Sites

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu+/Cu0 Sites

A Review on Particle Size Effect in Metal‐Catalyzed Heterogeneous Reactions

Catalytic Thermochemical Conversion of Algae and Upgrading of Algal Oil for the Production of High-Grade Liquid Fuel: A Review

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Selective conversion of coconut oil to fatty alcohols in methanol over a hydrothermally prepared Cu/SiO₂ catalyst without extraneous hydrogen

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites

Direct Synthesis of Hydrogen and Dimethoxylmethane from Methanol on Copper/Silica Catalysts with Optimal Cu⁺/Cu⁰ Sites