Synthesis and catalytic properties of porous Nb–Mo oxide solid acid

Tagusagawa, Caio; Takagaki, Atsushi; Iguchi, Akihiro; Takanabe, Kazuhiro; Kondo, Junko N.; Ebitani, Kohki; Tatsumi, Takashi; Domen, Kazunari

doi:10.1016/j.cattod.2010.10.049

Cited by 17 publications

(20 citation statements)

References 30 publications

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“…S1 †). [41][42][43][44][45][46][47] Based on the abovementioned results, we assume that the substrate like cellulose-derived glucose and sorbitol could be intercalated into the layered compounds, but isosorbide as the substrate could not be effectively intercalated. FT-IR and NH 3 -TPD of the layered compounds are given in the ESI (Fig.…”

Section: The Effect Of Layered Compound Linbmoomentioning

confidence: 98%

“…The yield of C1-C4 alkanes was decreased to 6.9% and the yield of desired hexanes was increased to 23.3% (entry 2). [41][42][43][44][45][46][47] Interestingly, using LiNbMoO 6 as the co-catalyst, higher yields of hexanes were observed (entries [14][15][16]. In the acidic media, it was easy to yield isosorbide by dehydration from sorbitol, which was formed in the hydrolysis hydrodeoxygenation of cellulose.…”

Section: Conversion Of Cellulosementioning

confidence: 99%

“…The morphologies of layered compounds were characterized by scanning electron microscope (SEM), in which the layered structures of the compounds were clearly observed. [41][42][43][44][45][46][47] In the current study, XRD experiments were also performed to analyse the layered materials aer ltrating and drying in air at 353 K (Fig. S10 and S11 †).…”

Section: The Effect Of Layered Compound Linbmoomentioning

confidence: 99%

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High yield of renewable hexanes by direct hydrolysis–hydrodeoxygenation of cellulose in an aqueous phase catalytic system

et al. 2015

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In aqueous phosphoric acid, cellulose was efficiently converted into hexanes using a Ru/C catalyst combined with layered compounds or silica-alumina materials. In this process, the direct production of hexanes from cellulose can be improved by suppressing the formation of isosorbide, which makes it difficult to yield hexanes by further hydrodeoxygenation. As the co-catalyst, layered compounds showed a significant inhibition effect on the formation of isosorbide from sorbitol due to the steric restrictions of sorbitol dehydration within the interlayers of layered compounds. Typically, layered LiNbMoO 6 played a great role in promoting the production of hexanes directly from cellulose and a promising yield (72% carbon mol) of hexanes was obtained. In addition, the protonic acid, H 3 PO 4 , offered efficient catalysis for the hydrolysis of cellulose and the dehydration of the sorbitol hydroxyl moiety.Scheme 1 Direct catalytic conversion of cellulose into hexanes over Ru/C combined with LiNbMoO 6 in aqueous phosphoric acid. Scheme 2The efficient conversion of cellulose to hexanes over LiNbMoO 6 and Ru/C in aqueous phosphoric acid.This journal is

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Section: The Effect Of Layered Compound Linbmoomentioning

confidence: 98%

Section: Conversion Of Cellulosementioning

confidence: 99%

Section: The Effect Of Layered Compound Linbmoomentioning

confidence: 99%

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High yield of renewable hexanes by direct hydrolysis–hydrodeoxygenation of cellulose in an aqueous phase catalytic system

et al. 2015

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“…The acid strength increased with W addition for mesoporous Nb x W 10−x and Ta x W 10−x oxides, and mesoporous Nb 3 W 7 and Ta 3 W 7 oxides exhibited the highest catalytic activity. In addition, synthesis of porous Nb x Mo 10−x oxides has been attempted [63]. Amorphous, mesoporous structures were observed in samples with x from 10 to 0, with samples with Mo concentrations of x = 3-8 forming large pores by interparticle voids.…”

Section: New Catalytic Systemsmentioning

confidence: 99%

Mechanistic Studies of Solid Acids and Base‐Catalyzed Clean Technologies

Takagaki

Nishimura

Ebitani

2013

Heterogeneous Catalysts for Clean Technology

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IntroductionThe importance of solid acid and base catalysts in clean technologies has been recognized for a long time, and many books and reviews have been published since the text by Tanabe [1]. Tanabe et al.[2] revised their book in 1989, reviewing the definition and classification of solid acids and bases, determination of acidic and basic properties, and catalysis for isomerization, acylation, hydration of alkenes, methanol conversion, dehydration, dehydrogenation, esterification, hydrolysis, hydrocraking (hydrogenolysis), and oxidation reactions. The development of solid acid catalysts has been surveyed in several reviews [3][4][5][6][7][8][9][10]. Catalysis by solid bases and the mechanism of base-catalyzed reactions such as isomerization of alkenes and alkynes, aldol addition and aldol condensation, Henry reaction (nitro-aldol reaction), Knoevenagel condensation, Michael addition, the Tishchenko reaction, alkylation reactions, and addition reactions such as addition of amines to epoxides, transfer hydrogenation (Meerwein-Ponndorf-Verley (MPV) reaction), esterification and transesterification, and liquid-phase oxidations including Baeyer-Villiger oxidation and alkene epoxidation have been recently emphasized by Ono and Hattori [11], encompassing many splendid reviews and papers [12][13][14][15][16][17][18][19][20].The first part of this chapter is intended to survey recent literature on new catalytic materials because the development of new types of metal oxides and layered-and carbon-based materials with different morphologies opens up novel acid-base catalysis that enables new type of clean reaction technologies. Mechanistic considerations of acid-and base-catalyzed reactions should result in new clean catalytic processes for Green and Sustainable Chemistry, for example, transformations of biorenewable feedstock into value-added chemicals and fuels [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The latter part of this chapter, therefore, focuses on biomass conversion using solid acid and base catalysts, which covers recent developments on acid-base, one-pot reaction systems for carbon-carbon bond formations, and biomass conversion including synthesis of furfurals from sugars, biodiesel production, and glycerol utilization.

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“…This is because of the hydrolysis of the robust crystalline structure of the cellulose still a challenge. [5] There are many examples reported in several reviews [1a,1b,6] on cellulose hydrolysis to obtain glucose with different acid catalysts such as mineral acids, [7] heteropolyacids, [8] ionic liquids, [9] supercritical water, [10] zeolites with metal particles, [11] metal oxides, [12] or sulfonated carbons, [13] as well as enzymes. [14] Nevertheless, product yields are often limited and there are several practical inconveniences.…”

Section: Introductionmentioning

confidence: 99%

Transformation of Cellulose into Nonionic Surfactants Using a One‐Pot Catalytic Process

et al. 2016

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Alkyl glucosides surfactants have been synthesized by a cascade process which involves the methanolysis of cellulose into methyl glucosides followed by the transacetalization with n-octanol. The first step was carried out using methanol as solvent and acid catalysts (such as inorganic acids, heteropolyacids, ion-exchange resins or modified carbon materials). Subsequently long chain alkyl glucosides can be obtained in a second step by transacetalization which involves the reaction of methyl glucosides with a fatty alcohol using the same acid catalyst. The overall process was performed under mild conditions. Amorphous sulfonated carbon catalyst achieved the best results for the complete conversion of cellulose in methanol at 200 ο C with yields higher than 80 % of methyl α,β-glucopyranosides. Moreover, this material containing -SO 3 H groups is optimal to perform the second step obtaining octyl and decyl glucosides in yields higher than 73 % at 120 ο C. In addition, catalyst reusability has been tested showing that sulfonated carbon catalyst (C-SO 3 H) can be reused with only a slightly decrease of its activity after four consecutive cycles.

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Synthesis and catalytic properties of porous Nb–Mo oxide solid acid

Cited by 17 publications

References 30 publications

High yield of renewable hexanes by direct hydrolysis–hydrodeoxygenation of cellulose in an aqueous phase catalytic system

High yield of renewable hexanes by direct hydrolysis–hydrodeoxygenation of cellulose in an aqueous phase catalytic system

Mechanistic Studies of Solid Acids and Base‐Catalyzed Clean Technologies

Transformation of Cellulose into Nonionic Surfactants Using a One‐Pot Catalytic Process

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