Conversion of glycerol over 10%Ni/γ-Al2O3 catalyst

Miranda, B.C.; Chimentão, R.J.; Santos, João Batista Oliveira dos; Gispert-Guirado, Francesc; Llorca, Jordi; Medina, Francisco; Bonillo, F. López; Sueiras, J.E.

doi:10.1016/j.apcatb.2013.09.026

Cited by 101 publications

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“…This fact suggests that the dehydration of glycerol may strongly contribute with the carbon deposition on the catalyst surface [55]. From our previous work [22], the conversion of hydroxyacetone with the Ni/y-Al 2 O 3 catalyst was about 16% and the major product was lactic acid with selectivity of 61%. Differently of Cu/y-Al 2 O 3 , selectivity of 14% to CH 4 was observed on Ni/y-Al 2 O 3 during hydroxyacetone reaction indicating the C C bond breaking on Ni in our previous work [22].…”

Section: Tablementioning

confidence: 99%

“…It can be seen that the selectivity to CH 4 is practically 100% on Ni, NiCu81, and NiCu41 catalysts. Our previous work [22] revealed that the increase in the total number of exposed Ni atoms and the degree of reduction of the NiO species increases the selectivity to CH 4 affecting the catalytic stability. Further increase in Cu content causes a decrease in the selectivity to CH 4 .…”

Section: Hydrogenolysis Of Glycerolmentioning

confidence: 99%

“…From our previous work [22], the conversion of hydroxyacetone with the Ni/y-Al 2 O 3 catalyst was about 16% and the major product was lactic acid with selectivity of 61%. Differently of Cu/y-Al 2 O 3 , selectivity of 14% to CH 4 was observed on Ni/y-Al 2 O 3 during hydroxyacetone reaction indicating the C C bond breaking on Ni in our previous work [22]. During catalytic conversion of pyruvaldehyde on Cu/y-Al 2 O 3 hydroxyacetone, lactic acid, lactide, pyruvic acid and acetic acid were the major products with selectivity of 28.9%, 17.8%, 28.9%, 17.9% and 6.41%, respectively (column 6, Table 5).…”

Section: Tablementioning

confidence: 99%

“…Details of experiment can be obtained in our previous work [22]. An aqueous solution of glycerol (3 v/v%) was pumped by a syringe pump with flow of 3.5 mL/h and injected into the reactive gas.…”

Section: Conversion Of Glycerolmentioning

confidence: 99%

“…Recently, we have studied the conversion of glycerol in gas phase at 573 K and atmospheric pressure over Ni based catalyst [22]. We proposed a general reaction pathway for glycerol conversion.…”

Section: Introductionmentioning

confidence: 99%

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Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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The catalytic transformation of glycerol to value-added compounds was investigated over bimetallic Ni-Cu/y-Al2 O3 catalysts with Ni/Cu atomic ratios of 8/1, 4/1, 2/1, 1/1, 1/2, 1/4, and 1/8. XPS analysis revealed that the surface composition of the catalyst exhibited progressive enrichment of Cu as its content in the catalyst increased. H2 -chemisorption indicated that the total number of exposed Ni atoms decreased as the Cu content increased. As a result, deep hydrogenolysis to produce CH4 was inhibited by the addition of Cu to the Ni catalyst, yielding higher selectivity toward the dehydration products of glycerol such as hydroxyacetone.FTIR spectra of adsorbed CO reveal that Cu asserts both geometric and electronic effects on the adsorption properties of Ni. The geometrical effect is visualized by the progressive disappearance of the bridge-bound adsorbed CO on metallic Ni by the incorporation of Cu. This suggests that the deep hydrogenolysis of glycerol to CH4 formation requires an ensemble of adjacent active Ni atoms. The electronic effect of Cu on Ni is indicated by the red shift of the IR peak of adsorbed CO as the Cu content increases. The electronic interaction between Cu and Ni species was also substantiated by XANES results. HTREM revealed metal particles very well distributed on the support with particle size of 1.5 to 5 nm. The Ni-Cu samples were not a total intermetallic alloys..

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Section: Tablementioning

confidence: 99%

Section: Hydrogenolysis Of Glycerolmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Conversion Of Glycerolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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Biodiesel ‐Derived Raw Glycerol to Value‐Added Products: Catalytic Conversion Approach

Julkapli

Dabdawb

Mansouri

2017

Handbook of Composites From Renewable Materials

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Influence of Catalyst Reduction Temperature on Autogenous Glycerol Hydrogenolysis over NiAl Catalyst

2022

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Autogenous glycerol hydrogenolysis to 1,2-propanediol by aqueous phase reforming (APR) was investigated over supported nickel catalysts. Effect of reduction temperature on physico-chemical properties of catalysts played a significant role in tuning conversion and product selectivities. The formation of nickel aluminate (NiAl 2 O 4 ) spinel phase during catalyst reduction led to rearrangement of Ni species to obtain small and stable Ni particles. The catalyst activation temperature alters the extent of reduction of multivalent Ni species (Ni 0 , Ni + 2/ + 3 ) which facilitated glycerol dehydration and hydrogenation while suppressing CÀ C cleavage and thus avoiding undesirable side products. Additionally, presence of moderate BrØnsted/Lewis acid ratio of the catalyst promoted higher 1,2-PDO selectivity. In-situ glycerol hydrogenolysis involves glycerol dehydration to acetol with simultaneous reforming to H 2 and CO 2 and this hydrogen converts acetol to 1,2-PDO.

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Conversion of glycerol over 10%Ni/γ-Al2O3 catalyst

Cited by 101 publications

References 59 publications

Influence of copper on nickel-based catalysts in the conversion of glycerol

Influence of copper on nickel-based catalysts in the conversion of glycerol

Biodiesel ‐Derived Raw Glycerol to Value‐Added Products: Catalytic Conversion Approach

Influence of Catalyst Reduction Temperature on Autogenous Glycerol Hydrogenolysis over NiAl Catalyst

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