Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Wang, Lina; Li, Zhong; Liu, Xin; Zhang, Pingping; Xie, Guangwen

doi:10.1016/j.ijhydene.2015.04.110

Cited by 42 publications

(12 citation statements)

References 54 publications

(62 reference statements)

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“…Comparison with the fresh sample (inset, left), indicates that surface is covered by a layer, which also shows lamellar shaped hexagonal precipitates. This layer (indicated by arrows) has similar aspect of that usually attributed to B-O compounds [7][8][9][10][11][12]15]. However, the formation of hexagonal, lamella-like precipitates was not reported before for this system.…”

Section: Low Sb Concentration Conditions In Cyclessupporting

confidence: 64%

“…It is clear that the catalyst surface is strongly modified upon contact with aqueous media, because in these conditions cobalt is unstable, and oxidizes to Co II (which can further react with OH -) according to Pourbaix diagram [21]. The catalyst after exposure to pure water has similar aspect to that usually attributed to the formation of the B-O layer [7][8][9][10][11][12]15].…”

Section: For a Better Comprehension Of The Interaction Between The Rementioning

confidence: 84%

“…In this direction, cobalt based materials have been intensively investigated because of their relative low cost and high activity [4][5][6]. According to literature there are many papers reporting the preparation of Co based catalysts with varying activity [4][5][6][7][8][9][10]. However, the major drawback of cobalt is that it deactivates upon use [5,[11][12].…”

Section: Introductionmentioning

confidence: 99%

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The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

Paladini

Arzac

Godinho

et al. 2017

Applied Catalysis B: Environmental

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Deactivation of a Co catalyst prepared as thin film by magnetron sputtering was studied for the sodium borohydride (SB) hydrolysis reaction under different conditions. Under high SB concentration in single run experiments, the formation of a B-O passivating layer was observed after 1.5 and 24 h use. This layer was not responsible for the catalyst deactivation. Instead, a peeling-off mechanism produced the loss of cobalt. This peeling-off mechanism was further studied in cycling experiments (14 cycles) under low SB concentrations. Ex-situ study of catalyst surface after use and solid reaction products (precipitates) was performed by X-Ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The presence of cobalt hydroxide and oxyhydroxide was detected as major components on the catalyst surface after use and as precipitates in the supernatant solutions after washing. Cobalt borate, cobalt carbonate and oxycarbonate *Revised Manuscript Click here to view linked References were also formed but in lesser amounts. These oxidized cobalt species were formed and further detached from the catalyst at the end of the reaction and/or during catalyst washing by decomposition of the unstable in-situ formed cobalt boride. Leaching of cobalt soluble species was negligible. Thin film mechanical detachment was also found but in a smaller extent. To study the influence of catalyst composition on deactivation processes, cycling experiments were performed with CoB and Co-C catalysts, also prepared as thin films. We found that the deactivation mechanism proposed by us for the pure Co catalyst also occurred for a different pure Co (prepared at higher pressure) and the CoB and Co-C samples in our experimental conditions.

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Section: Low Sb Concentration Conditions In Cyclessupporting

confidence: 64%

Section: For a Better Comprehension Of The Interaction Between The Rementioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

Paladini

Arzac

Godinho

et al. 2017

Applied Catalysis B: Environmental

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“…The peaks at around 777.9 and 793.1 eV are assigned to Co2p 3/2 and Co2p 1/2 of Co, respectively, those at around 780.8 and 796.8 eV to Co2p 3/2 and Co2p 1/2 of Co 2+ , respectively, and those around 785.3 and 802.6 eV to the shake-up satellite peaks of Co 2+ . 23,[25][26][27][28] The peaks at 852.4 and 869.8 eV are ascribed to Ni2p 3/2 and Ni2p 1/2 of Ni, 855.9 and 873.5 eV to Ni2p 3/2 and Ni2p 1/2 of Ni 2+ , and 861.2 and 879.6 eV to the shake-up satellite peaks of Ni 2+ . 17,[27][28][29][30] The peaks at 187.8 and 191.7 eV arise from B1s, the former is ascribed to B and the latter to B 3+ .…”

Section: Resultsmentioning

confidence: 98%

“…23,[25][26][27][28] The peaks at 852.4 and 869.8 eV are ascribed to Ni2p 3/2 and Ni2p 1/2 of Ni, 855.9 and 873.5 eV to Ni2p 3/2 and Ni2p 1/2 of Ni 2+ , and 861.2 and 879.6 eV to the shake-up satellite peaks of Ni 2+ . 17,[27][28][29][30] The peaks at 187.8 and 191.7 eV arise from B1s, the former is ascribed to B and the latter to B 3+ . 17,20 The peak at 129.3 eV is attributed to P with Co and Ni, whereas the peak at around 133.1 eV to the oxidized P. 19,27,29 These results indicated that Co, Ni, P, and B in the catalysts are both in atomic states and oxidation states.…”

Section: Resultsmentioning

confidence: 98%

Co‐Ni‐P‐B catalyzed hydroformylation of long linear α olefins

Guo

Fan

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: As indirect liquefaction of coal has been carried out in megaton scale, extension of the Fischer-Tropsch synthesis products has received renewed interest. Hydroformylation provides a way for the transformation of alkenes to aldehydes. Homogeneous rhodium complex catalysts are efficacious but expensive and not easy to recover and reuse. Heterogeneous catalysts are desired to enable their easy separation. Amorphous four-component non-precious metal catalysts were prepared using facile reduction and their activity toward hydroformylation of long linear ⊍ olefins was investigated.RESULTS: Obtained Co-Ni-P-B presented uniform nanoparticles that were well-dispersed Co with more electrons, attributing to isolation and electron transfer among the four components. The Co, Ni, P, and B were in both atomic states and oxidation states. The Co in Co-Ni-P-B was shown to be electron-enriched with enhanced catalytic activity. Co-Ni-P-B displayed good catalytic activity for hydroformylation of linear C 6 , C 8 , C 10 , or C 12 ⊍ olefins, and the highest activity for 1-octene. The conversion of 1-octene and the selectivity of C 9 aldehydes reached 99.62% and 96.30%, respectively. The ratio of nonanal to isononanal was 1.44. The selectivity for isomeric products was 3.70%. There existed an appropriate four-component ratio for hydroformylation of 1-octene owing to synergistic effects among the Co, Ni, P, and B. Co-Ni-P-B exhibited good reusability.CONCLUSION: Amorphous four-component Co-Ni-P-B prepared by facile reduction showed good catalytic performance toward hydroformylation of long linear C 6 , C 8 , C 10 , or C 12 ⊍ olefins due to synergistic effects among the Co, Ni, P, and B.

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Superior Monodisperse CNT‐Supported CoPd (CoPd@CNT) Nanoparticles for Selective Reduction of Nitro Compounds to Primary Amines with NaBH₄ in Aqueous Medium

et al. 2016

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Superior carbon nanotube furnished CoPd (CoPd@CNT) nanoparticles (NPs) were reproducibly and easily produced by sonochemical double solvent reduction method in a mild condition and the size of the CoPd NPs was found as 3.63 nm. The prepared novel catalyst were characterized by transmission electron microscopy (TEM), the high resolution electron micrograph (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The sum of their results showed the formation of highly crystalline, monodisperse and colloidally stable CoPd@CNT. The catalytic performance of these novel NPs were investigated for the first time for highly selective reduction to -NO 2 unlike -CN groups, in which they were found to be exceptional reusable, isolable, stable and highly efficient heterogeneous catalyst. All prepared products were obtained with perfect yield by using CoPd@CNT as a heterogeneous catalyst and NaBH 4 as a hydrogen source. Our synthesis process provides a facile and eco-friendly route to CoPd@CNT, allowing further investigation of current catalysts for many other chemical reactions.

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Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Cited by 42 publications

References 54 publications

The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

Co‐Ni‐P‐B catalyzed hydroformylation of long linear α olefins

Superior Monodisperse CNT‐Supported CoPd (CoPd@CNT) Nanoparticles for Selective Reduction of Nitro Compounds to Primary Amines with NaBH₄ in Aqueous Medium

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Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Cited by 42 publications

References 54 publications

The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

The role of cobalt hydroxide in deactivation of thin film Co-based catalysts for sodium borohydride hydrolysis

Co‐Ni‐P‐B catalyzed hydroformylation of long linear α olefins

Superior Monodisperse CNT‐Supported CoPd (CoPd@CNT) Nanoparticles for Selective Reduction of Nitro Compounds to Primary Amines with NaBH4 in Aqueous Medium

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Product

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Superior Monodisperse CNT‐Supported CoPd (CoPd@CNT) Nanoparticles for Selective Reduction of Nitro Compounds to Primary Amines with NaBH₄ in Aqueous Medium