Hydrodeoxygenation of benzyl alcohol on transition-metal-containing mixed oxides catalysts derived from layered double hydroxide precursors

Rizescu, Claudiu Eduard; Sun, Chao; Popescu, Ionel; Urdă, Adriana; Costa, Patrick Da; Marcu, Ioan–Cezar

doi:10.1016/j.cattod.2020.04.055

Cited by 13 publications

(5 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the IUPAC classification, all of the MMO samples exhibited type IV isotherms with H3 hysteresis loops indicating the presence of mesopores, a result that is confirmed by pore size distribution (Marimuthu et al, 2018;Rizescu et al, 2020). The hysteresis loops indicate that slit-like pores are formed by the collapse of the layers calcination treatment (Figure 5).…”

Section: Resultsmentioning

confidence: 73%

“…The precursors, LDH materials, were synthesized by the direct coprecipitation method to incorporate the metal ions. The atomic percentages of Cu, Zn, or Ni incorporated were 15%, replacing the Mg load in the material (Bálsamo et al, 2017;Bálsamo et al, 2020;Rizescu et al, 2020). The 15% level was chosen for the second divalent metal in the structure after the 15%, 20%, and 25% levels were evaluated.…”

Section: Catalysts Synthesismentioning

confidence: 99%

See 1 more Smart Citation

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

et al. 2022

View full text Add to dashboard Cite

The glycerol generated as a by-product in the production of biodiesel could be used as a renewable raw material to economically promote the production process. The catalytic conversion of glycerol to a product with higher added value, such as glycerol carbonate, has attracted great interest in the chemical, pharmaceutical, and lithium battery industries, among others, due to its low toxicity, hydration capacity, and biodegradability. Layered-double hydroxide (LDH) materials, the precursors of the catalysts, were synthesized by a direct coprecipitation method to incorporate a third metal ion in addition to magnesium and aluminum ions. This method is the easiest regularly applied technique to design these low cost anionic nanoclay. The atomic percentage of Cu, Zn, or Ni incorporated was 15% of the Mg load in the material. The synthesis atomic ratio, (M2++Mg2+)/Al3+ had a constant value of 3, where M represents the transition metal incorporated. LDHs produced the corresponding mixed metal oxides by thermal decomposition. These materials have excellent properties for reactions catalyzed by the basic sites, high surface area, homogeneous cation dispersion, and thermal stability. The physicochemical material properties were characterized by XRD, N2 sorption, MP-AES, TPD-CO2, SEM, and XPS. The mixed oxides were evaluated in the catalytic conversion of glycerol to glycerol carbonate. The addition of Cu, Ni, or Zn to the matrix of Mg and Al produced changes in its physicochemical properties and mostly in the catalytic activity. X-ray diffractograms of LDHs showed the typical characteristic structure of layers even with metallic ions of Cu, Ni, or Zn incorporated, because their ionic radii are similar to that of the Mg ion, 0.69, 0.73, and 0.74 Å, respectively. The obtained mixed oxides showed a high catalytic activity towards the conversion of glycerol to glycerol carbonate under mild reaction conditions, a 1:2 ratio of glycerol:ethylene carbonate and solvent free. Relative yields higher than 80% were obtained, attributable to an adequate distribution of basicity and textural parameters. The catalysts were used in successive reaction cycles without significant loss of activity.

show abstract

Section: Resultsmentioning

confidence: 73%

Section: Catalysts Synthesismentioning

confidence: 99%

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

et al. 2022

View full text Add to dashboard Cite

show abstract

“…4 Nevertheless, challenges persist in the form of diminished activity and catalyst deactivation, attributed to carbon deposition and Fe-oxidation in the presence of water. 13 Many different Fe-based catalysts have been studied for the HDO reaction: supported on alumina, 14,15 silica, [16][17][18] ceria, 19,20 zirconia, 21 magnesium aluminate, 22 and carbon matrices; 16,23,24 in the form of carbides, 25,26 phosphides, 27 and sulfides; 28 as part of bimetallic structures 29,30 or graphene composites. 31 However, few HDO studies were dedicated to pure iron/iron oxide phases as bulk catalysts.…”

Section: Introductionmentioning

confidence: 99%

Exploring Iron Oxide Catalysts for Acetone Hydrodeoxygenation: Making use of Earth-Abundant Resources

Nunes,

Strapasson,

Báfero

et al. 2024

Preprint

View full text Add to dashboard Cite

The catalytic performance of γ-Fe2O3 nanopowder was investigated in the acetone hydrodeoxygenation (HDO) reaction, an essential catalytic reaction in biomass valorization. Sequential reduction/oxidation thermal pre-treatments of the γ-Fe2O3 nanopowder induced significant structural and electronic modifications that directly impacted its catalytic performance. The co-existence of Fe3+/Fe2+/Fe0 sites led to different reaction pathways (C-C coupling, hydrogenolysis, hydrogenation, and (hydro)deoxygenation) that formed a wide range of products. The correlation of the catalytic and structural data provided a better understanding of C-O, C-C, and C-H bond activation under the HDO reactional stream in the presence of metallic and oxidized phases of iron. This study demonstrates the tunability of FeOx catalysts in the acetone HDO reaction to favor different reaction pathways and the formation of products. It highlights that tailoring active sites is crucial for developing selective and optimized catalysts for the HDO reaction.

show abstract

“…It has been used in the drilling process for several thousand wells in Chinese oil and gas fields, such as the Shengli Oilfield and the Dagang Oilfield. It has achieved impressive results [ 8 , 9 , 10 ]. In 1942, Feitknecht [ 11 ] stated that the structures of these compounds had double layers: a regular triakis octahedral layer containing divalent cations in another regular dioctahedral layer containing trivalent cations.…”

Section: Introductionmentioning

confidence: 99%

Multi-Mixed Metal Hydroxide as a Strong Stratigraphic Nanoclay Inhibitor in Solid-Free Drilling Fluid

Zhang

Wang

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Solid-free drilling fluid has more advantages as a new type of drilling fluid compared with traditional drilling fluid, such as improving drilling efficiency, protecting oil and not having clay particles clog the oil and gas layer. In this study, Zn/Cu/Fe-doped magnesium–aluminum hydroxide (Mg-Al MMH) was prepared using the co-precipitation method and evaluated in solid-free drilling fluid. The inhibition mechanism of synthesized hydroxide was analyzed by X-ray diffraction, laser particle-size analysis and thermogravimetric analysis. The samples were directly used as drilling fluid base muds for performance evaluation. The results showed that the linear expansion rate of 4% M6-Fe was only 12.32% at room temperature within 2 h, that the linear expansion rate was 20.28% at 90 °C and that the anti-swelling rate was 81.16% at room temperature, indicating that it has a strong inhibition ability at both room temperature and at high temperatures. Meanwhile, the possibility of multi-mixed metal hydroxide as a drilling fluid base mud is discussed in this study. We found that 4% M6-Fe exhibited low viscosity, a high YP/PV ratio and high temperature resistance, and its apparent viscosity retention rate reached 100% rolled at 200 °C for 16 h, with a YP/PV ratio of 2.33.

show abstract

Hydrodeoxygenation of benzyl alcohol on transition-metal-containing mixed oxides catalysts derived from layered double hydroxide precursors

Cited by 13 publications

References 47 publications

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

Exploring Iron Oxide Catalysts for Acetone Hydrodeoxygenation: Making use of Earth-Abundant Resources

Multi-Mixed Metal Hydroxide as a Strong Stratigraphic Nanoclay Inhibitor in Solid-Free Drilling Fluid

Contact Info

Product

Resources

About