Microwave synthesis of delaminated acid saponites using quaternary ammonium salt or polymer as template. Study of pH influence

Gebretsadik, Fiseha B.; Mance, Deni; Baldus, Marc; Salagre, Pilar; Cesteros, Yolanda

doi:10.1016/j.clay.2015.05.004

Cited by 19 publications

(32 citation statements)

References 37 publications

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“…The N 2 ‐physisorption analysis results of the catalyst precursors are presented in Table . The specific BET areas of all the catalysts precursors were lower than that of the support (600 m 2 g −1 ), which indicates that some of the pore volume was occupied by metal oxide particles. If we compare the BET areas of the unmodified catalyst precursor with the modified ones, they were lower for the V‐, Mo‐, and W‐modified catalyst precursors.…”

Section: Resultsmentioning

confidence: 99%

“…Mesoporous saponite in the H + form (MS; surface acidity, 1.02 mEq.

_{normalH^{+}}

g − ) synthesized as reported previously was used as a support for catalyst preparation. MS was stable until 1035 K (temperature of clay dehydroxylation), which was determined by using TGA .…”

Section: Methodsmentioning

confidence: 99%

“…Mesoporous saponite in the H + form (MS; surface acidity, 1.02 mEq.

_{normalH^{+}}

g − ) synthesized as reported previously was used as a support for catalyst preparation. MS was stable until 1035 K (temperature of clay dehydroxylation), which was determined by using TGA . Ni‐Cu/MS catalysts with 20, 30, and 40 wt % total metal loading and a Ni/Cu ratio of 6:1 were prepared by the impregnation of 1 g of the support with a calculated volume of 0.5 m Ni‐Cu in ethanol solution that contained appropriate amounts of Ni(NO 3 ) 2 and Cu(NO 3 ) 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Each sample was heated under a N 2 flow (80 cm 3 min −1 ) from 303 to 1173 K at a rate of 5 K min −1 . The total acidity was equivalent to the amount of CHA desorbed in the temperature range of 523–923 K in which the sample without CHA treatment did not show any significant mass loss …”

Section: Methodsmentioning

confidence: 99%

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Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

et al. 2017

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Ni and Cu mono‐ and bimetallic catalysts modified with various types of acid oxides MOx (M=Mo, V, W, and Re) were tested for the hydrogenolysis of glycidol as an alternative route to the hydrogenolysis of glycerol to obtain 1,3‐propanediol (1,3‐PrD). Characterization results revealed that the presence of modifiers affected the dispersion and reducibility of the NiO particles and the strength and amount of acid sites. Among the modifiers tested, Re led to the highest activity, a high propanediols selectivity, and the highest 1,3‐PrD/1,2‐propanediol (1,2‐PrD) ratio. The Ni‐Cu/Re ratio was optimized to improve the catalytic activity. The best catalytic result, with a 46 % 1,3‐PrD yield and a 1,3‐PrD/1,2‐PrD ratio of 1.24, was obtained if the monometallic Ni catalyst at 40 wt % loading and modified with 7 wt % Re was used at 393 K and 5 MPa H2 pressure after 4 h of reaction. The overall 1,3‐PrD yield starting from glycerol and assuming a two‐step synthesis (glycerol→glycidol→1,3‐PrD) and a yield of 78 % for the first step would be 36 %. This 1,3‐PD yield is the highest for a reaction catalyzed by a non‐noble metal and is comparable to the direct hydrogenolysis of glycerol using noble metal catalysts at a longer time and a high H2 pressure.

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Section: Resultsmentioning

confidence: 99%

“…Mesoporous saponite in the H + form (MS; surface acidity, 1.02 mEq.

_{normalH^{+}}

g − ) synthesized as reported previously was used as a support for catalyst preparation. MS was stable until 1035 K (temperature of clay dehydroxylation), which was determined by using TGA .…”

Section: Methodsmentioning

confidence: 99%

“…Mesoporous saponite in the H + form (MS; surface acidity, 1.02 mEq.

_{normalH^{+}}

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

et al. 2017

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“…2,20,21 Four saponites were prepared at pH 13, two of them using surfactant (As) and microwaves (Mw) during the aging treatment, and the other two aged by conventional thermal treatment (C) and without surfactant. 2,20,21 Four saponites were prepared at pH 13, two of them using surfactant (As) and microwaves (Mw) during the aging treatment, and the other two aged by conventional thermal treatment (C) and without surfactant.…”

Section: Synthesis Of the Supportsmentioning

confidence: 99%

Potential of Cu–saponite catalysts for soot combustion

Gebretsadik

Cesteros

Salagre

et al. 2016

Catal. Sci. Technol.

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H-and Na-saponite supports have been prepared by several synthesis approaches. 5% Cu/saponite catalysts have been prepared and tested for soot combustion in a NO x + O 2 + N 2 gas flow and with soot and catalyst mixed in loose contact mode. XRD, FT-IR, N 2 adsorption and TEM characterization results revealed that the use of either surfactant or microwaves during the synthesis led to delamination of the saponite support, yielding high surface area and small crystallite size materials. The degree of delamination affected further copper oxide dispersion and soot combustion capacity of the Cu/saponite catalysts. All Cu/saponite catalysts were active for soot combustion, and the NO 2 -assisted mechanism seemed to prevail. The best activity was achieved with copper oxide supported on a Na-saponite prepared at pH 13 and with surfactant. This best activity was attributed to the efficient copper oxide dispersion on the high surface area delaminated saponite (603 m 2 g −1 ) and to the presence of Na. Copper oxide reduction in H 2 -TPR experiments occurred at lower temperature for the Na-containing catalysts than for the H-containing counterparts, and all Cu/Na-saponite catalysts were more active for soot combustion than the corresponding Cu/H-saponite catalysts.Catal. Sci. Technol. This journal is

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Exfoliation of zinc-layered hydroxide by luminescent conjugate polyelectrolyte: synthesis and photophysical aspects

Quites

Germino

Azevedo

et al. 2017

J Sol-Gel Sci Technol

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Microwave synthesis of delaminated acid saponites using quaternary ammonium salt or polymer as template. Study of pH influence

Cited by 19 publications

References 37 publications

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

Potential of Cu–saponite catalysts for soot combustion

Exfoliation of zinc-layered hydroxide by luminescent conjugate polyelectrolyte: synthesis and photophysical aspects

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Microwave synthesis of delaminated acid saponites using quaternary ammonium salt or polymer as template. Study of pH influence

Cited by 19 publications

References 37 publications

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MOx‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MOx‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

Potential of Cu–saponite catalysts for soot combustion

Exfoliation of zinc-layered hydroxide by luminescent conjugate polyelectrolyte: synthesis and photophysical aspects

Contact Info

Product

Resources

About

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite

Hydrogenolysis of Glycidol as an Alternative Route to Obtain 1,3‐Propanediol Selectively Using MO_x‐Modified Nickel‐Copper Catalysts Supported on Acid Mesoporous Saponite