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Altaf CT, Minkina VG, Shabunya SI, Colak TO, Sankir ND, Sankir M, Kalinin VI. Ruthenium and Platinum-Modified Titanium Dioxide Support for NaBH 4 Hydrolysis. ACS OMEGA 2023; 8:36100-36108. [PMID: 37810642 PMCID: PMC10552117 DOI: 10.1021/acsomega.3c04269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 09/12/2023] [Indexed: 10/10/2023]
Abstract
Highly stable platinum (Pt) and ruthenium (Ru)-based catalysts on titanium oxide (TiO2) nanoparticle support were prepared. The productivity of hydrogen generation from sodium borohydride (NaBH4) hydrolysis was observed to be as high as 95%. The activation energies for the hydrolysis reaction in the presence of Ru/TiO2 in aqueous and alkaline solutions were 62.00 and 64.65 kJ mol-1, respectively. On the other hand, the activation energy value of the hydrolysis reaction with the Pt/TiO2 catalyst decreased from 60.5 to 53.2 kJ mol-1, and the solution was changed from an aqueous to an alkaline medium. The experimental results have indicated that NaOH concentration (ranging from 0.5 to 2 M) affected the hydrogen generation rate (HGR) differently for both metals on the TiO2 support. Consequently, the HGR of the hydrolysis reaction in the presence of the Ru/TiO2 catalyst decreased with increasing NaOH concentration, whereas the Pt/TiO2 catalyst efficiency increased with increasing NaOH concentration.
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Affiliation(s)
- Cigdem Tuc Altaf
- Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
| | - Valentina G Minkina
- A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, P. Brovka, 15. Minsk 220072, Republic of Belarus
| | - Stanislav I Shabunya
- A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, P. Brovka, 15. Minsk 220072, Republic of Belarus
| | - Tuluhan O Colak
- Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
| | - Nurdan Demirci Sankir
- Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
- Department of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
| | - Mehmet Sankir
- Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
- Department of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey
| | - Vladimir I Kalinin
- A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, P. Brovka, 15. Minsk 220072, Republic of Belarus
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AKBAYRAK S, TONBUL Y, ÖZKAR S. Reducible tungsten(VI) oxide-supported ruthenium(0) nanoparticles: highly active catalyst for hydrolytic dehydrogenation of ammonia borane. Turk J Chem 2023; 47:1224-1238. [PMID: 38173757 PMCID: PMC10762867 DOI: 10.55730/1300-0527.3607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 10/31/2023] [Accepted: 09/28/2023] [Indexed: 01/05/2024] Open
Abstract
Reducible WO3 powder with a mean diameter of 100 nm is used as support to stabilize ruthenium(0) nanoparticles. Ruthenium(0) nanoparticles are obtained by NaBH4 reduction of ruthenium(III) precursor on the surface of WO3 support at room temperature. Ruthenium(0) nanoparticles are uniformly dispersed on the surface of tungsten(VI) oxide. The obtained Ru0/WO3 nanoparticles are found to be active catalysts in hydrolytic dehydrogenation of ammonia borane. The turnover frequency (TOF) values of the Ru0/WO3 nanocatalysts with the metal loading of 1.0%, 2.0%, and 3.0% wt. Ru are 122, 106, and 83 min-1, respectively, in releasing hydrogen gas from the hydrolysis of ammonia borane at 25.0 °C. As the Ru0/WO3 (1.0% wt. Ru) nanocatalyst with an average particle size of 2.6 nm provides the highest activity among them, it is extensively investigated. Although the Ru0/WO3 (1.0% wt. Ru) nanocatalyst is not magnetically separable, it has extremely high reusability in the hydrolysis reaction as it preserves 100% of initial catalytic activity even after the 5th run of hydrolysis. The high activity and reusability of Ru0/WO3 (1.0% wt. Ru) nanocatalyst are attributed to the favorable metal-support interaction between the ruthenium(0) nanoparticles and the reducible tungsten(VI) oxide. The high catalytic activity and high stability of Ru0/WO3 nanoparticles increase the catalytic efficiency of precious ruthenium in hydrolytic dehydrogenation of ammonia borane.
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Affiliation(s)
- Serdar AKBAYRAK
- Department of Basic Sciences, Faculty of Engineering, Necmettin Erbakan University, Konya,
Turkiye
| | - Yalçın TONBUL
- Ziya Gökalp Faculty of Education, Dicle University, Diyarbakır,
Turkiye
| | - Saim ÖZKAR
- Department of Chemistry, Middle East Technical University, Ankara,
Turkiye
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Synthesis of High Crystallinity 1.13 nm Tobermorite and Xonotlite from Natural Rocks, Their Properties and Application for Heat-Resistant Products. MATERIALS 2022; 15:ma15103474. [PMID: 35629502 PMCID: PMC9145455 DOI: 10.3390/ma15103474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/06/2022] [Accepted: 05/10/2022] [Indexed: 02/05/2023]
Abstract
The main measure to reduce energy losses is the usage of insulating materials. When the temperature exceeds 500 °C, silicate and ceramic products are most commonly used. In this work, high-crystallinity 1.13 nm tobermorite and xonotlite were hydrothermally synthesized from lime and Ca−Si sedimentary rock, opoka. By XRD, DSC, TG and dilatometry methods, it has been shown that 1.13 nm tobermorite becomes the predominant compound in stirred suspensions at 200 °C after 4 h of synthesis in the mixture with a molar ratio CaO/SiO2 = 0.83. It is suitable for the production of insulating products with good physical−mechanical properties (average density < 200 kg·m−1, compressive strength ~0.9 MPa) but has a limited operating temperature (up to 700 °C). Sufficiently pure xonotlite should be used to obtain materials with a higher operating temperature. Even small amounts of semi-amorphous C−S−H(I) significantly increase its linear shrinkage during firing. It has also been observed that an increase in the strength values of the samples correlated well with the increase in the size of xonotlite crystallites. The optimal technological parameters are as follows: molar ratio of mixture CaO/SiO2 = 1.2; water/solid ratio W/S = 20.0; duration of hydrothermal synthesis at 220 °C—8 h, duration of autoclaving at 220 °C—4 h. The average density of the samples was ~180 kg·m−1, the operating temperature was at least 1000 °C, and the compressive strengths exceeded 1.5 MPa.
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Efficient Hydrogen Generation with Co3O4@TiO2-g-C3N4 Composite Catalyst via Catalytic NaBH4 Hydrolysis. Catal Letters 2021. [DOI: 10.1007/s10562-021-03848-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Siauciunas R, Smalakys G, Dambrauskas T. Porosity of Calcium Silicate Hydrates Synthesized from Natural Rocks. MATERIALS 2021; 14:ma14195592. [PMID: 34639988 PMCID: PMC8509785 DOI: 10.3390/ma14195592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 11/25/2022]
Abstract
In this work, the suitability of natural raw materials with various modifications of SiO2—granite sawing waste (quartz) and opoka (a mixture of cristobalite, tridymite, quartz, and an amorphous part)—for the 1.13 nm tobermorite and xonotlite synthesis is examined, and their specific surface area, pore diameter and volume, and the predominant pores are determined. Hydrothermal syntheses were carried out at 200 °C for 12 and 72 h from mixtures with a molar ratio of CaO/SiO2 = 1.0. X-ray diffraction analysis, simultaneous thermal analysis, and scanning electronic microscopy were used, which showed that in the lime–calcined opoka mixture the formation of crystalline calcium silicate hydrates takes place much faster than in the lime–granite sawing waste mixture. The high reactivity of amorphous SiO2 results in the rapid formation of 1.13 nm tobermorite and xonotlite (12 h). According to Brunauer, Emmet and Taller (BET) analysis data, this product features a specific surface area of ~68 m2/g, a total pore volume of 245 × 10−3 cm3/g, and has dominating 1–2.5 nm and 5–20 nm diameter pores. This porosity of the material should provide good thermal insulation properties of the products made from it as no air convection occurs in the fine pores.
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Akbayrak S, Özkar S. Magnetically Isolable Pt 0/Co 3O 4 Nanocatalysts: Outstanding Catalytic Activity and High Reusability in Hydrolytic Dehydrogenation of Ammonia Borane. ACS APPLIED MATERIALS & INTERFACES 2021; 13:34341-34348. [PMID: 34255473 DOI: 10.1021/acsami.1c08362] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The development of a new platinum nanocatalyst to maximize the catalytic efficiency of the precious noble metal catalyst in releasing hydrogen from ammonia borane (AB) is reported. Platinum(0) nanoparticles are impregnated on a reducible cobalt(II,III) oxide surface, forming magnetically isolable Pt0/Co3O4 nanocatalysts, which have (i) superb catalytic activity providing a record turnover frequency (TOF) of 4366 min-1 for hydrogen evolution from the hydrolysis of AB at room temperature and (ii) excellent reusability, retaining the complete catalytic activity even after the 10th run of hydrolysis reaction. The outstanding activity and stability of the catalyst can be ascribed to the strong interaction between the platinum(0) nanoparticles and reducible cobalt oxide, which is supported by the results of XPS analysis. Pt0/Co3O4 exhibits the highest TOF among the reported platinum-nanocatalysts developed for hydrogen generation from the hydrolysis of AB.
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Affiliation(s)
- Serdar Akbayrak
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
- Department of Chemistry, Sinop University, 57000 Sinop, Turkey
- Department of Basic Sciences, Faculty of Engineering, Necmettin Erbakan University, 42090 Konya, Turkey
| | - Saim Özkar
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
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Özkar S. A review on platinum(0) nanocatalysts for hydrogen generation from the hydrolysis of ammonia borane. Dalton Trans 2021; 50:12349-12364. [PMID: 34259283 DOI: 10.1039/d1dt01709h] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review reports a survey on the progress in developing highly efficient platinum nanocatalysts for the hydrolytic dehydrogenation of ammonia borane (AB). After a short prelude emphasizing the importance of increasing the atom efficiency of high cost, precious platinum nanoparticles (NPs) which are known to be one of the highest activity catalysts for hydrogen generation from the hydrolysis of AB, this article reviews all the available reports on the use of platinum-based catalysts for this hydrolysis reaction covering (i) early tested platinum catalysts, (ii) platinum(0) NPs supported on oxides, (iii) platinum(0) NPs supported on carbonaceous materials, (iv) supported platinum single-atom catalysts, (v) bimetallic- and (vi) multimetallic-platinum NP nanocatalysts, and (vii) magnetically separable platinum-based catalysts. All the reported results are tabulated along with the important parameters used in the platinum-catalyzed hydrolysis of AB. In the section "Concluding remarks and a look towards the future" a discussion is devoted to the approaches for making high cost, precious platinum catalysts as efficient as possible, ultimately lowering the cost, including the suggestions for the future research in this field.
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Affiliation(s)
- Saim Özkar
- Department of Chemistry, Middle East Technical University, Ankara, Turkey.
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Abstract
In 2007, the US Department of Energy recommended a no-go on NaBH4 hydrolysis for onboard applications; however, the concept of a NaBH4-H2-PEMFC system has the potential to become a primary source for on-demand power supply. Despite the many efforts to study this technology, most of the published papers focus on catalytic performance. Nevertheless, the development of a practical reaction system to close the NaBH4-H2 cycle remains a critical issue. Therefore, this work provides an overview of the research progress on the solutions for the by-product rehydrogenation leading to the regeneration of NaBH4 with economic potential. It is the first to compare and analyze the main types of processes to regenerate NaBH4: thermo-, mechano-, and electrochemical. Moreover, it considers the report by Demirci et al. on the main by-product of sodium borohydride hydrolysis. The published literature already reported efficient NaBH4 regeneration; however, the processes still need more improvements. Moreover, it is noteworthy that a transition to clean methods, through the years, was observed.
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Zhang H, Feng X, Cheng L, Hou X, Li Y, Han S. Non-noble Co anchored on nanoporous graphene oxide, as an efficient and long-life catalyst for hydrogen generation from sodium borohydride. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.12.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Özhava D, Özkar S. Nanoalumina-supported rhodium(0) nanoparticles as catalyst in hydrogen generation from the methanolysis of ammonia borane. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.06.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Tanyildizi S, Morkan İ, Özkar S. Nanotitania-Supported Rhodium(0) Nanoparticles: Superb Catalyst in Dehydrogenation of Dimethylamine Borane. ChemistrySelect 2017. [DOI: 10.1002/slct.201700872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Seda Tanyildizi
- Department of Chemistry; Abant İzzet Baysal University; 14280 Bolu Turkey
| | - İzzet Morkan
- Department of Chemistry; Abant İzzet Baysal University; 14280 Bolu Turkey
| | - Saim Özkar
- Department of Chemistry; Middle East Technical University; 06800 Ankara Turkey
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