Physical and chemical studies of tungsten carbide catalysts: effects of Ni promotion and sulphonated carbon

Rodella, Cristiane B.; Barrett, Dean H.; Moya, Silvia F.; Figueroa, Santiago; Pimenta, Marcos de Mattos; Curvelo, A. A. S.; Silva, Victor Teixeira da

doi:10.1039/c5ra03252k

Cited by 59 publications

(30 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[9][10][11] For instance, recent research has uncovered the hidden potentialo fn anostructured WC as ah ydrodeoxygenation catalyst [12] and as as upport for Ni particles in biorefinery. [13] This research showedt hat it is possible to convert cellulosei nto ethylene glycol in 29 %y ield using tungsten carbide catalysts at 245 8Ca nd 60 bar of hydrogen in ab atch reactor. Interestingly,t he yield could be increased to 61 %u sing a2%N i-doped tungsten carbide.…”

Section: Introductionmentioning

confidence: 95%

“…Recently, however, interest in WC as a catalyst has returned since the need for sustainable catalysts as alternatives for traditional precious‐metal‐based systems has increased . For instance, recent research has uncovered the hidden potential of nanostructured WC as a hydrodeoxygenation catalyst and as a support for Ni particles in biorefinery . This research showed that it is possible to convert cellulose into ethylene glycol in 29 % yield using tungsten carbide catalysts at 245 °C and 60 bar of hydrogen in a batch reactor.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogenation Properties of Nanostructured Tungsten Carbide Catalysts in a Continuous‐Flow Reactor

Braun

Esposito

2016

ChemCatChem

View full text Add to dashboard Cite

Tungsten monocarbide (WC) obtained via urea glass route showed a high activity as well as chemoselectivity for the continuous flow reduction of a variety of nitro groups under milder conditions, compared to previous reports. The favorable effect of the nanostructure was shown by comparison to other commercial WC species. Moreover, WC functioned as an efficient support for nickel nanoparticles, expanding its range of applicability and leading to a bimetallic Ni@WC composite characterized by high activity for the hydrogenation of cardanol, a phenolic lipid obtained from cashew nutshells

show abstract

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Hydrogenation Properties of Nanostructured Tungsten Carbide Catalysts in a Continuous‐Flow Reactor

Braun

Esposito

2016

ChemCatChem

View full text Add to dashboard Cite

show abstract

“…In the spectrum the characteristic peaks are assigned as: 284 eV (C1 s) for carbon, at 169.0 eV for sulphur (S2p) from sulfonic acid group (not thiol), at 399.7 eV for nitrogen (N1 s) and at 531.5 eV for oxygen (O1 s). The closer scrutiny of XPS analysis further revealed two peak at 169.9 eV Figure b and 226.1 eV Figure c for S 2p and S 2 s, respectively . Thus, this XPS analysis revealed the presence of –SO 3 H functionality in our sulfonated crosslinked polymer HCC‐ML‐SO 3 H. The acid strength of HCC‐ML‐SO 3 H was calculated from the acidimetric titration result.…”

Section: Resultsmentioning

confidence: 64%

Organic Solid Acid Catalyst for Efficient Conversion of Furfuryl Alcohol to Biofuels

et al. 2016

View full text Add to dashboard Cite

We report the synthesis of a highly active microporous sulphonated monolithic catalyst (HCC‐ML‐SO3H) through the Friedel–Crafts alkylation reaction between carbazole and α,α′‐dibromo‐p‐xylene in the presence of a Lewis acid catalyst FeCl3 under refluxing conditions, followed by sulphonation reaction (chlorosulfonic acid treatment under controlled reaction conditions). This sulphonated solid acid catalyst can catalyze the ring opening of furanoid moiety of furfuryl alcohol (FA) and subsequent esterification with various alcohols in one‐pot to produce levulinate esters, which are potential biofuels. Here the porous organic polymer bearing reactive SO3H groups (HCC‐ML‐SO3H) acts as a very reactive solid acid catalyst. Due to large surface area and extensive cross‐linking this porous polymer is very attractive material for the synthesis of levulinate esters from FA under metal free conditions. The catalyst has been characterized by N2 sorption, HR‐TEM, 13C solid state CP MAS NMR, XPS and FT‐IR. The catalyst can be reused for four consecutive reaction cycles without appreciable loss of activity.

show abstract

“…Nevertheless, the Mo 2 C_PM sample presented the lowest CO uptake and catalytic activity ( Table 1) that can be explained considering the covering of the surface by the adventitious carbon formed through the Boudouard reaction during the carbothermal synthesis. In fact, there are reports in the literature [14,34] showing that the synthesis of carbides by the carbothermal route renders materials covered by a thin layer of carbon as seen by HRTEM. In line with these reported results, it can be assumed that the low CO chemisorption value obtained for sample Mo 2 C_PM is due to the carbon coverage of the particles.…”

Section: Catalytic Evaluationmentioning

confidence: 95%

Synthesis of Nanostructured Molybdenum Carbide as Catalyst for the Hydrogenation of Levulinic Acid to γ-Valerolactone

2015

Self Cite

View full text Add to dashboard Cite

The effect of the morphology and size of unsupported molybdenum carbide (b-Mo 2 C) was investigated in the selective hydrogenation of levulinic acid to cvalerolactone (GVL) in aqueous phase. Nanostructured bMo 2 C was synthetized by two different approaches: (i) using multiwalled carbon nanotubes (CNT) as both hard template and source of carbon and; (ii) using 1D nanostructured a-MoO 3 as precursor. Depending on the type of synthesis used, the morphology of the resulting b-Mo 2 C was different. Well-oriented b-Mo 2 C nanoparticles with a fibril morphology were formed when CNTs were used as hard template and source of carbon at 700°C for 6 h under inert environment, while well-defined b-Mo 2 C 1D nanostructures were formed after carburization of the nano-sized a-MoO 3 precursor at 650°C/2 h under 20 % (v/v) CH 4 /H 2 atmosphere. The catalytic performance of the materials was investigated at 30 bar H 2 and 180°C in a batch reactor and compared with a Mo 2 C synthesized by temperatureprogrammed carburization of commercial MoO 3 . The bMo 2 C 1D nanostructures presented a relatively higher activity than the others probably as a result of more exposed active sites, confirmed by the higher CO chemisorption uptake. All of the catalysts were highly selective to GVL ([85 %). Deep hydrogenation products such as 1,4 pentanediol and methyltetrahydrofuran were observed in minor amounts, underlining the hydrogenation potential of molybdenum carbide based materials.

show abstract

Physical and chemical studies of tungsten carbide catalysts: effects of Ni promotion and sulphonated carbon

Abstract: Ni promoted tungsten carbides have been shown to be an effective catalyst for cellulose conversion reaction.

Cited by 59 publications

References 45 publications

Hydrogenation Properties of Nanostructured Tungsten Carbide Catalysts in a Continuous‐Flow Reactor

Hydrogenation Properties of Nanostructured Tungsten Carbide Catalysts in a Continuous‐Flow Reactor

Organic Solid Acid Catalyst for Efficient Conversion of Furfuryl Alcohol to Biofuels

Synthesis of Nanostructured Molybdenum Carbide as Catalyst for the Hydrogenation of Levulinic Acid to γ-Valerolactone

Contact Info

Product

Resources

About