CoO-Co2P composite nanosheets as highly active catalysts for sodium borohydride hydrolysis to generate hydrogen

2020 ◽  
Vol 13 (06) ◽  
pp. 2051025
Author(s):  
Hongyan Liu ◽  
Qianyu Shi ◽  
Yumei Yang ◽  
Ya-Na Yu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Sodium Hypophosphite ◽  
X Ray Diffraction ◽  
Water Displacement ◽  
X Ray ◽  
Highly Active ◽  
Naoh Solution ◽  
Adsorption Desorption ◽  
Hydrolysis Of

In this paper, CoO[Formula: see text]Co2P composite nanocatalysts as highly active catalysts were successfully prepared for catalytic hydrolysis of sodium borohydride (NaBH[Formula: see text] to generate hydrogen. For catalyst preparation, pre-synthesized Co(OH)2 nanosheets were uniformly mixed with sodium hypophosphite (NaH2PO[Formula: see text] and then treated through vapor-phase phosphorization process. For characterization, field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), N2 adsorption–desorption measurement and X-ray photoelectric spectroscopy (XPS) were carried out, and traditional water-displacement method was performed to measure the hydrogen generation rate (HGR). It was found that component and catalytic activity of the composites were greatly affected by the ratio of Co(OH)2 to NaH2PO2. When the ratio was 2:1, the obtained catalyst composed of CoO and Co2P presented the highest HGR up to 3.94[Formula: see text]L min[Formula: see text] g[Formula: see text] using a 2[Formula: see text]wt.% NaBH[Formula: see text][Formula: see text]wt.% NaOH solution at [Formula: see text]C, and the apparent activation energy was detected as low as 27.4[Formula: see text]kJ mol[Formula: see text]. Additionally, the optimum CoO[Formula: see text]Co2P catalyst still retains 60% of the initial activity after recycling four times.

Electrodeposited Co–Zn on Ni foam as efficient catalysts for hydrogen generation from hydrolysis of sodium borohydride

2017 ◽  
Vol 10 (05) ◽  
pp. 1750065 ◽  
Author(s):  
Lei Wei ◽  
Maixia Ma ◽  
Yanhong Lu ◽  
Suling Zhang ◽  
Jing Gao ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Hydrogen Generation ◽  
Energy Dispersive Spectrometer ◽  
X Ray Diffraction ◽  
Water Displacement ◽  
Ni Foam ◽  
X Ray ◽  
Naoh Solution

For hydrogen generation based on the sodium borohydride hydrolysis, the development and application of efficient catalysts are of key importance. In this work, Co and Co–Zn catalysts were prepared on Ni foam by electrodeposition process. Field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed for materials characterization, and catalyst performance was measured by typical water-displacement method. Experimental results indicate that the doping of zinc affects the morphology and microstructure of catalyst and promotes the effective catalytic area, leading to higher hydrogen generation rate (HGR) by comparing with Co/Ni. Furthermore, HGR can be further improved by treating the Co–Zn/Ni with NaOH solution because the partial dissolving of zinc results in the increase of cobalt active sites. Using a 10[Formula: see text]wt.% NaBH4 and 5[Formula: see text]wt.% NaOH solution, the HGR was as high as 455[Formula: see text]mL min[Formula: see text] g[Formula: see text] at 25[Formula: see text]C, and the apparent activation energy was measured to be 50.2[Formula: see text]kJ mol[Formula: see text]. Cyclic performance of the NaOH-treated Co–Zn/Ni was investigated as well.

3D porous Ni–Zn catalyst for catalytic hydrolysis of sodium borohydride and ammonia borane

2019 ◽  
Vol 13 (01) ◽  
pp. 1950093 ◽  
Author(s):  
Lei Wei ◽  
Qian Liu ◽  
Shuang Liu ◽  
Xinrong Liu
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Nickel Foam ◽  
Ammonia Borane ◽  
Pure Hydrogen ◽  
Catalytic Hydrolysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Highly Active ◽  
Hydrolysis Of

As promising hydrogen carriers, sodium borohydride (SB) and ammonia borane (AB) can controllably release pure hydrogen by means of catalytic hydrolysis at mild condition. In this work, we introduced a novel and facile method for transformation of commercial nickel foam (NF) to highly active 3D porous Ni–Zn catalyst. The method consisted of three steps including electroplating zinc on NF, alloying treatment and chemical etching. Catalyst microstructure and component were characterized by field-emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Hydrogen generation measurement indicates that the prepared Ni–Zn catalyst is highly efficient for catalytic hydrolysis of SB and AB to generate hydrogen. Moreover, recycling performance of the catalyst was also investigated.

scholarly journals Ru Nanoparticles Supported on MIL-101 by Double Solvents Method as High-Performance Catalysts for Catalytic Hydrolysis of Ammonia Borane

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Tong Liu ◽  
Qingtao Wang ◽  
Bingzheng Yan ◽  
Mei Zhao ◽  
Wenbo Li ◽  
...  
Keyword(s):  
High Performance ◽  
Hydrogen Generation ◽  
Catalytic Hydrolysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ru Nanoparticles ◽  
Amine Boranes ◽  
Adsorption Desorption ◽  
Hydrolysis Of ◽  
Catalytic Test

Highly dispersed crystalline Ru nanoparticles (NPs) were successfully immobilized inside the pores of MIL-101 by a double solvents method (DSM). HRTEM clearly demonstrated the uniform distribution of the ultrafine Ru NPs throughout the interior cavities of MIL-101. The synthesized Ru@MIL-101 catalyst was also characterized by X-ray diffraction (XRD), N2adsorption desorption, and ICP-AES. The catalytic test indicated that the Ru NPs supported MIL-101 material exhibited exceedingly high activity and excellent durability for hydrogen generation from the catalytic hydrolysis of amine boranes.

Hydrogen Generation from Hydrolysis of Sodium Borohydride Using Nanosized NiB Amorphous Alloy Catalysts

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050081
Author(s):  
Hongjing Yuan ◽  
Weitao Huo ◽  
Yongchao Hao ◽  
Yanna Wang ◽  
Weiye Qiao ◽  
...  
Keyword(s):  
Particle Size ◽  
Amorphous Alloy ◽  
Sodium Borohydride ◽  
Photoelectron Spectroscopy ◽  
Hydrogen Generation ◽  
Chemical Reduction ◽  
Catalytic Performance ◽  
X Ray ◽  
Transmission Electron ◽  
Hydrolysis Of

Generation of hydrogen by sodium borohydride solution had attracted lots of attention. A serial of nanosized NiB catalysts were prepared using the chemical reduction method through introducing AlCl3 into the preparation. Catalytic performance of NiB catalysts were investigated in the hydrolysis of alkaline NaBH4 solution. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption, Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results showed that NiB catalysts possessed amorphous alloy structure, and the particle size could be adjusted by the AlCl3 amount. Catalytic performance showed that NiB catalyst with smaller particle size had much higher activity. The NiB catalyst also displayed high stability, the catalytic activity could retain about 84% of its initial value after four cycles.

Various Rate Law Orders Through Hydrolysis of Sodium Borohydride Over Co-M-Zr-B (M= Cr, Mo and W) Nano Catalyst

2017 ◽  
Vol 6 (2) ◽  
pp. 45-61
Author(s):  
Mohammad Hassan Loghmani
Keyword(s):  
Sodium Borohydride ◽  
Hydrogen Generation ◽  
Oxide Phase ◽  
Amorphous Structure ◽  
Group Vi ◽  
Rate Law ◽  
Highly Active ◽  
Nano Catalyst ◽  
Xrd Patterns ◽  
Hydrolysis Of

This article describes a Group (VI) modified Co-Zr-B amorphous nano alloys were prepared in situ ultrasound-assisted reduction by sodium borohydride in an aqueous solution. Co-Cr-Zr-B, Co-Mo-Zr-B and Co-W-Zr-B powders were characterized by XRD, FESEM, BET and ICP techniques. No distinct peak could be observed in XRD patterns of the obtained catalysts indicating that all samples possessed amorphous structure. Indeed, it was not seen any metal oxide phase. Obtained powders are highly active catalysts for hydrogen generation from the hydrolysis of sodium borohydride. The reported work also includes the full experimental details for the collection of a wealth of kinetic data to determine the activation energy and effects of the catalyst dosage, amount of NaBH4, and temperature on the rate of the catalytic hydrolysis of sodium borohydride. Rate law orders of all catalysts were calculated from an Arrhenius plot of each catalyst.

ZIF-67 derived cobalt-based catalysts for hydrogen generation from the hydrolysis of alkaline sodium borohydride solution

2019 ◽  
Vol 12 (04) ◽  
pp. 1950050 ◽  
Author(s):  
Lei Wei ◽  
Hongyan Liu ◽  
Qian Wang ◽  
Wenjuan Li ◽  
Lufeng Peng
Keyword(s):  
Catalytic Activity ◽  
Sodium Borohydride ◽  
Pyrolysis Temperature ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Displacement Method ◽  
Water Displacement ◽  
Catalyst Composition ◽  
And Performance ◽  
Hydrolysis Of

Cobalt-based catalysts are highly efficient and low-cost for sodium borohydride (NaBH[Formula: see text] hydrolysis to generate hydrogen. Co3O4 and carbon-supported metal Co (i.e., Co/C) catalysts were prepared by means of ZIF-67 pyrolysis. Effects of pyrolysis temperature and atmosphere on catalyst composition and performance were mainly investigated. For material analyses, a series of characterizations were carried out including FE-SEM, TEM, XRD, BET, TGA and ICP-AES. Conventional water-displacement method was employed to evaluate the catalyst performance toward NaBH4 hydrolysis. Experimental results indicated that catalytic activity of the Co3O4 was much higher than that of Co/C, and the reasons were discussed in detail.

Hydrogen generation from the hydrolysis of sodium borohydride using TiO2 supported Ru nanocatalysts prepared by photocatalytic reduction

2018 ◽  
Vol 11 (04) ◽  
pp. 1850079 ◽  
Author(s):  
Lei Wei ◽  
Maixia Ma ◽  
Dongsheng Wang ◽  
Qian Wang ◽  
Yanhong Lu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Hydrogen Generation ◽  
Average Particle Size ◽  
Photocatalytic Reduction ◽  
Average Particle ◽  
Hydrogen Energy ◽  
Water Displacement ◽  
Naoh Solution ◽  
Hydrolysis Of

The worldwide application of hydrogen energy greatly promotes the development of NaBH4 hydrolysis for hydrogen production, particularly the study of hydrolysis catalysts. In this work, an anatase TiO2-supported ruthenium nanocatalysts (i.e., Ru/TiO2) was facilely prepared by photocatalytic reduction without the use of any chemical reducing reagents. The Ru catalysts had an average particle size of approximately 2.2[Formula: see text]nm and were uniformly distributed. The Ru/TiO2 was characterized by HRTEM, EDS, XRD, XPS and ICP-AES, respectively, and evaluated by classical water-displacement method. Using a 5[Formula: see text]wt.% NaBH[Formula: see text][Formula: see text]wt.% NaOH solution, hydrogen generation (HG) rate was as high as 38.6[Formula: see text]L[Formula: see text]min[Formula: see text][Formula: see text]g[Formula: see text] at 30∘C, and apparent activation energy was calculated to be 55.9[Formula: see text]kJ[Formula: see text]mol[Formula: see text]. Compared with similar Ru-based catalysts reported in literature, the Ru/TiO2 prepared in this work shows higher catalytic activity and lower apparent activation energy. After recycling for five times, the HG rate remained to be 91.7% of the initial level.

Identification of acid-insoluble filter-plugging compounds and optimal acid-washing procedures for tubular backpulse pressure filters

TAPPI Journal ◽  
2011 ◽  
Vol 10 (1) ◽  
pp. 17-23
Author(s):  
KEVIN TAYLOR ◽  
RICH ADDERLY ◽  
GAVIN BAXTER
Keyword(s):  
Calcium Sulfate ◽  
Membrane Filter ◽  
Sulfamic Acid ◽  
Xrd Analysis ◽  
Metal Sulfides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gypsum Formation ◽  
Acid Washing ◽  
Hydrolysis Of

Over time, performance of tubular backpulse pressure filters in kraft mills deteriorates, even with regular acid washing. Unscheduled filter replacement due to filter plugging results in significant costs and may result in mill downtime. We identified acid-insoluble filter-plugging materials by scanning electron microscope/energy-dispersion X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis in both polypropylene and Gore-Tex™ membrane filter socks. The major filter-plugging components were calcium sulfate (gypsum), calcium phosphate (hydroxylapatite), aluminosilicate clays, metal sulfides, and carbon. We carried out detailed sample analysis of both the standard acid-washing procedure and a modified procedure. Filter plugging by gypsum and metal sulfides appeared to occur because of the acid-washing procedure. Gypsum formation on the filter resulted from significant hydrolysis of sulfamic acid solution at temperatures greater than 130°F. Modification of the acid-washing procedure greatly reduced the amount of gypsum and addition of a surfactant to the acid reduced wash time and mobilized some of the carbon from the filter. With surfactant, acid washing was 95% complete after 40 min.

Investigation of the products of carbothermal reduction of yttrium oxide by the hydrolysis method

1984 ◽  
Vol 49 (4) ◽  
pp. 936-943 ◽  
Author(s):  
Bohumil Hájek ◽  
Pavel Karen ◽  
Vlastimil Brožek
Keyword(s):  
Yttrium Oxide ◽  
Carbothermal Reduction ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrolysis Method ◽  
Sample Decomposition ◽  
Products Of Reaction ◽  
Hydrolysis Of ◽  
Lower Carbon

For the investigation of the products of reaction of yttrium oxide with carbon mixed in various proportions, the chemical and X-ray diffraction methods of analysis were combined with the gas chromatographic analysis of the mixture of hydrocarbons and hydrogen formed on the sample decomposition with water. The carboreduction of Y2O3 was examined at relatively low temperatures, convenient for obtaining the reaction intermediates in higher yields. At 1 600 °C and pressures of 10-3 Pa the reduction of a mixture of Y2O3 with carbon in a stoichiometric ratio of 1 : 7 yields YC2 in equilibrium with 20% of Y2OC phase. At lower carbon contents (down to the Y2O3 : C ratio of 1 : 2) tha fraction of the Y2OC phase increases up to approximately 30%. In addition to Y2O3, the reaction mixture contains also Y2C, Y2OC and a phase giving propyne on hydrolysis. The presence of traces of C3 hydrocarbons and small amounts of methane in the product of hydrolysis of the carbide sample prepared by the carbothermal reduction of the oxide can be explained in terms of the occurrence of the Y15C19 phase, probably substituted in part by oxygen, and of the Y2OC phase. The results are compared with those obtained previously for the Sc2O3 + C system.

scholarly journals Metal(II) Coordination Polymers from Tetracarboxylate Linkers: Synthesis, Structures, and Catalytic Cyanosilylation of Benzaldehydes

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 204
Author(s):  
Yu Li ◽  
Chumin Liang ◽  
Xunzhong Zou ◽  
Jinzhong Gu ◽  
Marina V. Kirillova ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Polycarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trimethylsilyl Cyanide ◽  
Effect Of Solvent ◽  
Highly Active ◽  
Solvent Type ◽  
Metal Organic ◽  
Chloride Salts

Three 2D coordination polymers, [Cu2(µ4-dpa)(bipy)2(H2O)]n∙6nH2O (1), [Mn2(µ6-dpa)(bipy)2]n (2), and [Zn2(µ4-dpa)(bipy)2(H2O)2]n·2nH2O (3), were prepared by a hydrothermal method using metal(II) chloride salts, 3-(2′,4′-dicarboxylphenoxy)phthalic acid (H4dpa) as a linker, as well as 2,2′-bipyridine (bipy) as a crystallization mediator. Compounds 1–3 were obtained as crystalline solids and fully characterized. The structures of 1–3 were established by single-crystal X-ray diffraction, revealing 2D metal-organic networks of sql, 3,6L66, and hcb topological types. Thermal stability and catalytic behavior of 1–3 were also studied. In particular, zinc(II) coordination polymer 3 functions as a highly active and recoverable heterogeneous catalyst in the mild cyanosilylation of benzaldehydes with trimethylsilyl cyanide to give cyanohydrin derivatives. The influence of various parameters was investigated, including a time of reaction, a loading of catalyst and its recycling, an effect of solvent type, and a substrate scope. As a result, up to 93% product yields were attained in a catalyst recoverable and reusable system when exploring 4-nitrobenzaldehyde as a model substrate. This study contributes to widening the types of multifunctional polycarboxylic acid linkers for the design of novel coordination polymers with notable applications in heterogeneous catalysis.

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