Superior activity of Pd nanoparticles confined in carbon nanotubes for hydrogen production from formic acid decomposition at ambient temperature

Ding, Tianyi; Zhao, Zhigang; Ran, Maofei; Yang, Yao‐Yue

doi:10.1016/j.jcis.2018.12.017

Cited by 52 publications

(18 citation statements)

References 59 publications

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“…Metal doped CNTs have also shown promising results in the hydrodeoxygenation of anisole [30], Aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid [31], and transformation of furfural to cyclopentanone, as well as in-situ hydrogen generation via decomposition of bio-acids [32]. Ding et al [33] reported the decomposition of FA into CO 2 and H 2 over Pd/CNTs at room temperature with a high turnover frequency (TOF) of 1135 h − 1 . Nabid and co-workers [34] synthesized Ag core Pd shell nanoparticles supported on CNTs without any additives and achieved FA dehydrogenation with an overall activation energy of 28.28 KJ mol − 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Due to the different basicity and acidity, each of the various doping types of N in CNTs promotes different catalytic reactions [44,45]. Although experimental data suggest that functionalised CNTs are promising catalysts for in-situ hydrogen generation from the decomposition of bio-acids [33][34][35], the literature on the reaction mechanism is very limited. Particularly, the interactions between each functional component of the CNTs catalyst composite have rarely been explored.…”

Section: Introductionmentioning

confidence: 99%

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The mechanism of hydrogen donation by bio-acids over metal supported on nitrogen-doped carbon nanotubes

Zhang

Osatiashtiani

et al. 2021

Molecular Catalysis

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Biomass-derived carboxylic acids (e.g. acetic acid AcOH and formic acid FA) are a green and low-cost hydrogen source to replace hazardous H 2 gas in in-situ hydrogenation processes. To date, bio-acids dehydrogenation has been mainly conducted using noble metal catalysts which would negatively impact the process economy, thus development of efficient non-noble metal catalysts for this purpose is highly desirable. In this study, the performance of transition metals supported on nitrogen doped carbon nanotubes was thoroughly evaluated by computational modelling based on Density Functional Theory (DFT). Results revealed that, out of the 10 selected transition metal candidates, molybdenum (Mo) was most active for binding AcOH and a combination of Mo and nitrogen doping significantly enhanced binding to the carboxylic acid molecules compared to pristine carbon nanotubes (CNTs). The newly designed Mo/N-CNT catalysts considerably facilitated the bio-acids decomposition compared to the non-catalytic scenarios by lowering energy barriers. FA distinctly outperformed AcOH in hydrogen donation over Mo/N-CNT catalysts, through its spontaneous cleavage leading to facile hydrogen donation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The mechanism of hydrogen donation by bio-acids over metal supported on nitrogen-doped carbon nanotubes

Zhang

Osatiashtiani

et al. 2021

Molecular Catalysis

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“…In order to solve the above problems, various strategies have been attempted to stabilize Pd NPs including confinement of them in solids, polymers or ligands [15][16][17][18]. For example, carbon materials, including graphene [19], carbon nanotubes [20] and carbon fibers [21], have been used to load Pd NPs, and these carbon-loaded Pd NPs exhibit high catalytic turnover frequency (TOF) values of 1068-2520 h −1 . Porous nanomaterials such as molecular sieves and metal-organic frameworks have also been used to anchor Pd NPs, and the Pd NPs confined within their nanopores exhibit excellent chemoselectivity of 99% at 353 K [22].…”

Section: Introductionmentioning

confidence: 99%

Recyclable nanocellulose-confined palladium nanoparticles with enhanced room-temperature catalytic activity and chemoselectivity

et al. 2020

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We describe the synthesis of even-dispersed palladium nanoparticles (Pd NPs) confined within a cellulose nanofiber (CNF) matrix for developing a high-performance and recyclable catalyst. The CNF matrix was composed of CNF-assembled mesoporous nanosheets and appeared as soft and hydrophilic foam. Ultrafine Pd NPs (~6 nm) with highloading (9.6 wt%) were in situ grown on these mesoporous nanosheets, and their dense spatial distributions were likely to generate nano-confinement catalytic effects on the reactants. Consequently, the CNF-confined Pd NPs (CNF-Pd) exhibited an enhanced room-temperature catalytic activity on the model reaction of 4-nitrophenol hydrogenation with a highest rate constant of 8.8×10 −3 s −1 and turnover frequency of 2640 h −1 . The CNF-Pd catalyst possessed good chemical stability and recyclability in aqueous media which could be reused for at least six cycles without losing activity. Moreover, chemoselective reduction of 3-nitrostyrene was achieved with high yield (80%-98%) of 3-aminostyrene in alcohol/water cosolvent. Overall, this work demonstrates a positive nanoconfinement effect of CNFs for developing stable and recyclable metal NP catalysts.

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“…Moreover, it was found that the catalyst support played an effective role towards overall distribution of the metal nanoparticles . A number of studies have reported the influence of the active carbon support on GOR for multimetallic Pd‐based nanoparticles. Various carbon based supports like carbon black, furnace black, acetylene black, and activated carbon, single and multi‐walled carbon nanotubes have been reported for the noble metal catalysts .…”

Section: Introductionmentioning

confidence: 99%

Pd/CNT Catalysts for Glycerol Electro‐oxidation: Effect of Pd Loading on Production of Valuable Chemical Products

et al. 2020

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Glycerol (C3H8O3), a waste product of biodiesel, is considered as a suitable substrate for electro‐oxidation process to generate high value‐added products. A suitable active catalyst could improve the yield of desirable organic compounds from electro‐oxidation of glycerol. In this work, palladium nanoparticles supported over activated multi‐walled carbon nanotubes (MWCNTs) with varying loadings of 5 %–40 % were prepared using chemical reduction method and used to study their potential for electro‐oxidation of glycerol to produce various high value‐added products. The catalysts were characterized by different physicochemical methods, such as X‐ray diffraction (XRD), N2 adsorption‐desorption, and Transmission electron microscopy (TEM), whereas the electro‐oxidation activity of the catalysts was analysed using cyclic voltammetry (CV) and chronoamperometry (CA), and the products were identified by high performance liquid chromatography (HPLC). The electrochemical surface area (SESA) and mass activity (MA) were increased from 176.98 m2 g−1 to 282.29 m2 g−1 and 12.22 mA mg−1 to 49.53 mA mg−1 by increasing the Pd‐loading from 5 % to 20 %, respectively. While the further increase to 40 % Pd loading, the SESA and MA values decreased to 231.45 m2 g−1 and 47.63 mA mg−1respectively. The results found that the optimum 20 % Pd‐loading showed the excellent electrochemical properties due to uniform distribution of Pd‐metal particles over MWCNTs. High performance liquid chromatography (HPLC) showed the tartronic acid, glyceric acid and glyceraldehyde as dominant products. Mechanism of the reaction has also been proposed based on product distribution.

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Superior activity of Pd nanoparticles confined in carbon nanotubes for hydrogen production from formic acid decomposition at ambient temperature

Cited by 52 publications

References 59 publications

The mechanism of hydrogen donation by bio-acids over metal supported on nitrogen-doped carbon nanotubes

The mechanism of hydrogen donation by bio-acids over metal supported on nitrogen-doped carbon nanotubes

Recyclable nanocellulose-confined palladium nanoparticles with enhanced room-temperature catalytic activity and chemoselectivity

Pd/CNT Catalysts for Glycerol Electro‐oxidation: Effect of Pd Loading on Production of Valuable Chemical Products

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