Ultrasmall Ru nanoparticles supported on chitin nanofibers for hydrogen production from NaBH4 hydrolysis

Zhang, Jiapeng; Lin, Fanzhen; Yang, Lijing; He, Zhaoyi; Huang, Xuejun; Zhang, Dingwei; Dong, Hua

doi:10.1016/j.cclet.2019.11.042

Cited by 54 publications

(14 citation statements)

References 51 publications

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“…The small nanoparticles can provide more surface atoms, thereby enhancing catalytic activity. [51] The TEM images and metal particle size distributions of the mono-and bimetallic carbon-supported catalysts are shown in Figure 3. As shown in Figure 3c, the average particle size of RuÀ Ni was 14.1 nm, which is larger than that of monometallic Ru/MEC with an average size of 7.2 nm.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

Tian

Zhu

et al. 2021

ChemSusChem

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The thermal degradation and conversion of waste polyethylene (PE) using a two-step process including hydrothermal oxidation (HO) and aqueous phase reforming (APR) were investigated. The objective of this study was to achieve efficient disposal of waste PE and generate H 2 in a mild and green way. The effects of various HO conditions on both HO and APR processes were studied. A high H 2 O 2 concentration caused overoxidation of PE resulting in more CO 2 . Decreasing the H 2 O 2 concentration weakened the overoxidation. The process using diluted H 2 O 2 exhibited the highest selectivity for acetic acid among the produced carboxylic acids. When the HO temperature exceeded 200°C, there was an increase in the CO 2 yield during the HO process and a decrease in the H 2 yield during the APR process. In addition, the effects of various monometallic and bimetallic catalysts on the reforming of the aqueous phase from the HO of PE were discussed. The highest H 2 mole fraction (51.52 %) in gaseous products from the APR process was obtained with Ru/ mesoporous carbon. Nevertheless, RuÀ Ni exhibited a higher stability than the monometallic Ru catalyst.

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Section: Resultsmentioning

confidence: 99%

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

Tian

Zhu

et al. 2021

ChemSusChem

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“…Second, the aforementioned stoichiometry implies an effective gravimetric hydrogen capacity of 4.8 wt% for the couple NaBH 4 ‐CH 3 OH, and this is a clearly promising capacity. In addition, the HGR was calculated to be 331 mL(H 2 ) min −1 (without catalyst), which is one of the best performance for an uncatalyzed solvolysis reaction involving a hydride and a protonic solvent; some examples are shown in Table 1 21,22,30,64‐74 …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the HGR was calculated to be 331 mL(H 2 ) min −1 (without catalyst), which is one of the best performance for an uncatalyzed solvolysis reaction involving a hydride and a protonic solvent; some examples are shown in Table 1. 21,22,30,[64][65][66][67][68][69][70][71][72][73][74] The as-formed NaB(OCH 3 ) 4 can be readily hydrolyzed into NaB(OH) 4 , and 4 equiv CH 3 OH are generated. The cycle is then neutral in CH 3 OH.…”

Section: Toward a Neutral Cycle With Nabhmentioning

confidence: 99%

Closing the hydrogen cycle with the couple sodium borohydride‐methanol, via the formation of sodium tetramethoxyborate and sodium metaborate

et al. 2020

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Methanolysis of sodium borohydride (NaBH 4) is one of the methods efficient enough to release, on demand, the hydrogen stored in the hydride as well as in 4 equiv of methanol (CH 3 OH). It is generally reported that, in methanolysis, sodium tetramethoxyborate (NaB(OCH 3) 4) forms as single component of the spent fuel. It is, however, necessary to clearly investigate some critical aspects related to it. We first focused on the methanolysis reaction where NaBH 4 was reacted with 2, 4, 8, 16, or 32 equiv of CH 3 OH. With 2 equiv of CH 3 OH, the conversion of NaBH 4 is not complete. With 4 to 32 equiv of CH 3 OH, NaBH 4 is totally methanolized (conversion of 100%). The best conditions are those involving 4 equiv of CH 3 OH as they offer the highest effective gravimetric hydrogen storage capacity with 4.8 wt%, an attractive H 2 generation rate with 331 mL(H 2) min −1-a performance achieved without any catalyst-and the formation of NaB(OCH 3) 4 as single product as identified by X-ray diffraction, Fourier transform infrared spectroscopy, and nuclear magnetic resonance. We then focused on the transformation of this product NaB(OCH 3) 4 into sodium metaborate (NaBO 2), via the formation of sodium tetrahydroxyborate (NaB (OH) 4). NaB(OCH 3) 4 is easily transformed in water, by hydrolysis, at 80 C and for 90 minutes, into NaB(OH) 4 and 4 equiv of CH 3 OH. In doing so, the cycle with CH 3 OH is closed. Subsequently, NaB(OH) 4 is recovered and converted into NaBO 2 under heating at 500 C. This reaction liberates 4 equiv of H 2 O, which allows to close the cycle with water. Based on these achievements, we have finally proposed a triangular recycling scheme aiming at closing the cycle with the protic reactants of the aforementioned reactions. This scheme may be used as base for implementing a closed cycle with the couple NaBH 4-CH 3 OH.

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“…In order to accelerate the reaction kinetics of hydrolysis NaBH 4 , a variety of catalysts such as Co [ 5 , 6 , 7 , 8 ], Ni [ 9 , 10 , 11 ], Rh [ 12 ], Pd [ 13 ], Ru [ 14 , 15 ], and Pt [ 16 , 17 ] have been comprehensively studied. Although Pt-based catalysts are one of the most active catalysts, the scarce storage and expensive price are the main obstacles to their large-scale application.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Pt-Ni Nanoparticles Confined in Porous Titanium Oxide Cage for Hydrogen Generation from NaBH4 Hydrolysis

Kang

Sun

et al. 2022

Nanomaterials

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Sodium borohydride (NaBH4), with a high theoretical hydrogen content (10.8 wt%) and safe characteristics, has been widely employed to produce hydrogen based on hydrolysis reactions. In this work, a porous titanium oxide cage (PTOC) has been synthesized by a one-step hydrothermal method using NH2-MIL-125 as the template and L-alanine as the coordination agent. Due to the evenly distributed PtNi alloy particles with more catalytically active sites, and the synergistic effect between the PTOC and PtNi alloy particles, the PtNi/PTOC catalyst presents a high hydrogen generation rate (10,164.3 mL∙min−1∙g−1) and low activation energy (28.7 kJ∙mol−1). Furthermore, the robust porous structure of PTOC effectively suppresses the agglomeration issue; thus, the PtNi/PTOC catalyst retains 87.8% of the initial catalytic activity after eight cycles. These results indicate that the PtNi/PTOC catalyst has broad applications for the hydrolysis of borohydride.

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Ultrasmall Ru nanoparticles supported on chitin nanofibers for hydrogen production from NaBH4 hydrolysis

Cited by 54 publications

References 51 publications

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

Catalytic Reforming of the Aqueous Phase Derived from Diluted Hydrogen Peroxide Oxidation of Waste Polyethylene for Hydrogen Production

Closing the hydrogen cycle with the couple sodium borohydride‐methanol, via the formation of sodium tetramethoxyborate and sodium metaborate

Bimetallic Pt-Ni Nanoparticles Confined in Porous Titanium Oxide Cage for Hydrogen Generation from NaBH4 Hydrolysis

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