Selective hydrogenation of fatty acids to alcohols over highly dispersed ReO /TiO2 catalyst

Rozmysłowicz, Bartosz; Кирилин, А. Д.; Aho, Atte; Manyar, Haresh; Hardacre, Christopher; Wärnå, Johan; Salmi, Tapio; Murzin, Dmitry Yu.

doi:10.1016/j.jcat.2015.01.003

Cited by 85 publications

(66 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The selectivity of propanoic acid conversion towards 1‐propanol decreased in favor of propanal as conversion was lowered. This influence of conversion on selectivity is plotted in Figure and is consistent with a two‐step alcohol formation reaction proceeding through an aldehyde intermediate, which has been reported previously . Under differential conditions, the influence of temperature on the rate of reaction was measured and is summarized in Figure (b).…”

Section: Resultssupporting

confidence: 87%

“…Prior work found that carboxylic acid reduction is catalyzed by Pt/TiO 2 at the Pt‐TiO 2 interface, wherein Pt was believed to supply H to active sites on the TiO 2 surface in a bifunctional surface reaction mechanism . More recent studies of carboxylic acid reduction catalyzed by Re and Pd‐promoted Re (which are much more active than the Pt/TiO 2 system) have struggled to demonstrate that the cooperation of metal and metal oxide sites is still required to produce a catalytically active site . Studies suggest that “intimate contact” between Pd and Re must be achieved to produce an active catalyst, but as Re is often reduced to a mixture of oxidized and metallic species under reaction conditions, the active state of the Re is obscured.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

et al. 2019

View full text Add to dashboard Cite

Silica‐, titania‐, and zirconia‐supported tungsten oxide catalysts were synthesized by wetness impregnation techniques. When promoted with Pd, these materials catalyzed the reduction of propanoic acid to 1‐propanol at 433 K with a selectivity of up to 92 % (13.5 % conversion) in atmospheric pressure of H2. Over Pd‐promoted WOx/TiO2, the observed orders of reaction were 0.2 in H2 and 0.7 in propanoic acid, and the apparent activation energy was 54 kJ mol−1. In situ X‐ray absorption spectroscopy of Pd‐promoted WOx/SiO2 revealed a slight reduction of the W from +6 to an average oxidation state of about +5 during H2 treatment above 473 K. In situ infrared spectroscopy indicated the catalyst surface was covered mostly by propanoate species during reaction. For comparison, supported phosphotungstic acid was also evaluated as a catalyst under identical conditions, but the resulting high acidity of the catalyst was deleterious to alcohol selectivity.

show abstract

Section: Resultssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Many previous attempts on the reduction of the reaction pressures (down to 20 bar H2) have been achieved with high conversion and selectivities by replacing Cu or Cr with noble metals such as Ru, Rh, Re, Pd, or Pt [4]. For example, the hydrogenation of carboxylic acids to alcohols using a Pt/TiO2 catalyst as reported recently by Hardacre et al at only 130 °C, 20 bar H2 and gave over 80 % conversion (with 90 % selectivity) after 12 h [5].…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Dodecanoic Acid to Dodecane-1-ol Catalyzed by Supported Bimetallic Ni-Sn Alloy

Rodiansono

Pratama

Astuti

et al. 2018

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

Selective hydrogenation of dodecanoic acid over supported bimetallic Ni-Sn alloy catalysts into dodecane-1-ol is demonstrated. Bimetallic nickel-tin supported on titanium oxide (Ni-Sn(1.5)/TiO2) and gamma-alumina (Ni-Sn(1.5)/-Al2O3); 1.5 = Ni/Sn molar ratio) were synthesized via hydrothermal method in a sealed-Teflon autoclave reactor at 150 o C for 24 h, then followed by reducing with hydrogen gas at 400 o C for 1.5 h. The synthesized catalysts were characterized by means of XRD, IC-AES, N2-adsorption (BET method), H2-chemisorption, and NH3-TPD. Bimetallic Ni-Sn(1.5)/TiO2 catalyst was found to be effective for hydrogenation of dodecanoic acid (>99 % conversion) to dodecane-1-ol (93% yield) at 160 o C, 30 bar H2, and 20 h and the highest dodecane-1-ol (97 % yield) was obtained at initial pressure of H2, 50 bar. An increase of reaction temperature slightly enhanced the degree of hydrodeoxygenation of dodecanoic acid to produce dodecane over both Ni-Sn(1.5)/TiO2 and Ni-Sn(1.5)/-Al2O3 catalysts.

show abstract

“…The Re on TiO 2 catalyst itself has attracted attention for selective oxidation of methanol to methylal 48,49 and selective hydrogenation of steric acid to octadecanol. 31 In both cases, it is believed that rhenium oxide is responsible for the active sites. Thus, it is valuable to investigate the nature of Re interaction with the TiO 2 support and understand how interactions with the TiO 2 support could affect oxidation states.…”

Section: ■ Introductionmentioning

confidence: 99%

Understanding the Growth, Chemical Activity, and Cluster–Support Interactions for Pt–Re Bimetallic Clusters on TiO₂(110)

et al. 2016

View full text Add to dashboard Cite

The growth and chemical activity of Re, Pt, and Pt−Re bimetallic clusters supported on TiO 2 (110) have been studied. Pure Re clusters interact strongly with the titania support, resulting in the reduction of the titania surface, and the Re clusters also appear to be partially covered by TiO x at Re coverages as high as 13 ML. Bimetallic clusters can be grown from sequential deposition of Pt and Re in either order at high metal coverages (3.7 ML), where the number of initial nucleation sites is large; in contrast, at lower coverages (0.24 ML), pure Re clusters coexist with Pt−Re clusters for Re deposited on Pt due to the higher nucleation density of Re compared with Pt. The surface composition of the high coverage Pt on Re clusters is ∼100% Pt, but the Re on Pt clusters contain both Pt and Re at the surface after diffusion of some fraction of Re atoms in the bulk. The lower surface free energy of Pt compared to Re makes it thermodynamically favorable for Pt to remain at the surface when Pt is deposited on Re, whereas Re atoms deposited on the Pt clusters will diffuse into the clusters. Isotopic labeling experiments that incorporate 18 O into the titania lattice demonstrate that lattice oxygen participates in both CO oxidation on the Pt on Re bimetallic clusters and recombination of carbon and oxygen to form CO on the Re-containing clusters.

show abstract

Selective hydrogenation of fatty acids to alcohols over highly dispersed ReO /TiO2 catalyst

Cited by 85 publications

References 16 publications

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

Selective Hydrogenation of Dodecanoic Acid to Dodecane-1-ol Catalyzed by Supported Bimetallic Ni-Sn Alloy

Understanding the Growth, Chemical Activity, and Cluster–Support Interactions for Pt–Re Bimetallic Clusters on TiO₂(110)

Contact Info

Product

Resources

About

Selective hydrogenation of fatty acids to alcohols over highly dispersed ReO /TiO2 catalyst

Cited by 85 publications

References 16 publications

Reduction of Propanoic Acid over Pd‐Promoted Supported WOx Catalysts

Reduction of Propanoic Acid over Pd‐Promoted Supported WOx Catalysts

Selective Hydrogenation of Dodecanoic Acid to Dodecane-1-ol Catalyzed by Supported Bimetallic Ni-Sn Alloy

Understanding the Growth, Chemical Activity, and Cluster–Support Interactions for Pt–Re Bimetallic Clusters on TiO2(110)

Contact Info

Product

Resources

About

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

Reduction of Propanoic Acid over Pd‐Promoted Supported WO_x Catalysts

Understanding the Growth, Chemical Activity, and Cluster–Support Interactions for Pt–Re Bimetallic Clusters on TiO₂(110)