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16940-66-2Relevant articles and documents
A facile solvent-free method for NaBH4 and Na2B12H12 synthesis
He, Liqing,Fu, Yanda,Wu, Dong,Zhang, Dehui,Cheng, Hua,Lin, Huaijun,Li, Xiangnan,Xiong, Wei,Zhu, Qing,Deng, Yonghong,Shao, Huaiyu,Li, Hai-Wen,Zhao, Xingzhong,Lu, Zhouguang
, p. 16 - 21 (2018)
Sodium tetrahydroborate (NaBH4) and dodecahydro-closo-dodecaborate (Na2B12H12) are both important inorganic compounds presenting multiple applications. Nevertheless, multistep and complicated conditions are usually demanded for their synthesis. In order to simplify the synthesis processes, we design a novel and facile solvent-free method for synthesizing NaBH4 or Na2B12H12 from NaNH2 and B10H14. The product of either NaBH4 or Na2B12H12 is manipulable by simply adjusting the ratio of NaNH2 to B10H14. The reaction equations of synthesizing NaBH4 and Na2B12H12 are proposed and verified, and the reaction pathways are elucidated. The findings here supply new insight to synthesize metal dodecaborates using the strategy of equal electron body for the first time and may shed light on synthesis of small metal B-H compounds from large B-H clusters.
Synthesis of NaBH4 based on a solid-state reaction under Ar atmosphere
Zhang, Hanping,Zheng, Shiyou,Fang, Fang,Chen, Guorong,Sang, Ge,Sun, Dalin
, p. 352 - 355 (2009)
Sodium borohydride, NaBH4, was successfully synthesized via solid-state reaction under Ar instead of H2 atmosphere. A 4NaH-NaBO2-2SiO2 ternary mixture was first ball-milled and pressed into pellet, and then calc
NaBH4 formation mechanism by reaction of sodium borate with Mg and H2
Li,Liu,Zhu,Morigasaki,Suda
, p. 311 - 316 (2007)
It has been reported that sodium (potassium) borohydride can be formed by reaction of sodium (potassium) borate with Mg and hydrogen or magnesium hydride. However, few investigations on reaction mechanism have been reported. Here, we studied the NaBH4 formation mechanism of Mg + NaBO2 + 2H2 = NaBH4 + MgO through morphology observations, structure and micro composition analyses. It was found that when heating the reactor to 400 °C, NaBO2 particles were agglomerated with Mg particles and a NaBO2 network was formed due to the sintering effect. With further heating the reactor, a porous product layer (composed of NaBH4 and MgO) was formed on Mg particles. It was found that no matter whether Mg was hydrogenated or not, Mg could react with sodium borate and hydrogen to form sodium borohydride. Elevating the reaction temperature was of benefit to NaBH4 formation. Higher NaBH4 yield can be obtained by using partially hydrogenated then dehydrogenated Mg.
Supersilylated tetraphosphene derivatives M2[t-Bu 3SiPPPPSi-t-Bu3] (M = Li, Na, Rb, Cs) and Ba[t-Bu 3SiPPPPSi-t-Bu3]: Reactivity and Cis-trans isomerization
Lorbach, Andreas,Nadj, Andor,Tuellmann, Sandor,Dornhaus, Franz,Schoedel, Frauke,Saenger, Inge,Margraf, Guenter,Bats, Jan W.,Bolte, Michael,Holthausen, Max C.,Wagner, Matthias,Lerner, Hans-Wolfram
, p. 1005 - 1017 (2009)
The tetraphosphenediides M2[t-Bu3SiPPPPSi-t-Bu 3] (M = Li, Na, K) were accessible by the reaction of P4 with the silanides M[Si-t-Bu3] (M = Li, Na, K), whereas M 2[t-Bu3SiPPPPSi-
Production of sodium borohydride by using dynamic behaviors of protide at the extreme surface of magnesium particles
Suda,Morigasaki,Iwase,Li
, p. 643 - 647 (2005)
An advanced process for the production of sodium borohydride (NaBH 4) as a hydrogen storage material was developed, which applied the dynamic hydriding and dehydriding behaviors of protide (H-) in Mg-H system under transitional temperature conditions. An abundant natural resource named borax (Na2B4O7?10H2O) and the anhydrous sodium metaborate (NaBO2) recovered from the spent fuel as NaBO2?4H2O were used as the starting material in the present process. Powder-state Mg played an important role in the transitional hydriding and dehydriding process where the gaseous hydrogen was converted to protide at the extreme surface of Mg to form NaBH 4 in exchange with the simultaneous transition of oxygen in NaBO 2 to form MgO. In the present process, the protide as the most reactive state among the four states of hydrogen is applied for the synthesis of NaBH4, which can exist in metal-hydrogen complexes, such as NaAlH4 and NaBH4. The NaBH4 yield was reached higher than 90% by a single batch process but was found to be largely dependent on the rate of temperature change and the particle size, i.e., the specific surface area of Mg particles.
A simple and efficient way to synthesize unsolvated sodium octahydrotriborate
Huang, Zhenguo,King, Graham,Chen, Xuenian,Hoy, Jason,Yisgedu, Teshome,Lingam, Hima K.,Shore, Sheldon G.,Woodward, Patrick M.,Zhao, Ji-Cheng
, p. 8185 - 8187 (2010)
A simple and efficient way to synthesize unsolvated sodium octahydrotriborate has been developed. This method avoids the use of dangerous starting materials and significantly simplifies the reaction setup, thus enabling convenient large-scale synthesis. The structure of the unsolvated compound has been determined through powder X-ray diffraction.
Breaking the Passivation: Sodium Borohydride Synthesis by Reacting Hydrated Borax with Aluminum
Huang, Zhenguo,Liu, Jiangwen,Ouyang, Liuzhang,Wang, Hui,Zhong, Hao,Zhu, Min,Zhu, Yongyang
, p. 9087 - 9093 (2021)
A significant obstacle in the large-scale applications of sodium borohydride (NaBH4) for hydrogen storage is its high cost. Herein, we report a new method to synthesize NaBH4 by ball milling hydrated sodium tetraborate (Na2B4O7 ? 10H2O) with low-cost Al or Al88Si12, instead of Na, Mg or Ca. An effective strategy is developed to facilitate mass transfer during the reaction by introducing NaH to enable the formation of NaAlO2 instead of dense Al2O3 on Al surface, and by using Si as a milling additive to prevent agglomeration and also break up passivation layers. Another advantage of this process is that hydrogen in Na2B4O7 ? 10H2O serves as a hydrogen source for NaBH4 generation. Considering the low cost of the starting materials and simplicity in operation, our studies demonstrate the potential of producing NaBH4 in a more economical way than the commercial process.
Structure and properties of NaBH4·2H2O and NaBH4
Filinchuk, Yaroslav,Hagemann, Hans
, p. 3127 - 3133 (2008)
NaBH4·2H2O and NaBH4 were studied by single-crystal Xray diffraction and vibrational spectroscopy. In NaBH 4·2H2O, the BH4- anion has a nearly ideal tetrahedral geometry and is bridged with two Na+ ions through the tetrahedral edges. The structure does not contain classical hydrogen bonds, but reveals strong dihydrogen bonds of 1.77-1.95 A. Crystal structures and vibrational spectra of NaBr·2H2O and NaBH 4·2H2O reveal many similarities. The unit cell volume of NaBH4·2H2O increases linearly with temperature between 200 and 313 K. At 313-315 K, the hydrate decomposes into NaBH4 and H2O, which react to release hydrogen. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
A coal desulfurization process via sodium metaborate electroreduction with pulse voltage using a boron-doped diamond thin film electrode
Shu, Chenhua,Sun, Tonghua,Jia, Jinping,Lou, Ziyang,Shen, Yafei
, p. 1476 - 1485 (2013)
A preliminary study was conducted on the coal desulfurization process via NaBO2 electroreduction with pulse voltage using a boron-doped diamond (BDD) thin film electrode. It has been proved that NaBO2 was converted into NaBH4 by 11B NMR. The factors that influence the conversion rate of NaBO2 into NaBH4 and coal desulfurization efficiency were investigated. Under the conditions of -1.5 V forward pulse voltage, +0.5 V reverse pulse voltage, 0.2 mol L-1 NaBO2 concentration, 0.5 mol L-1 NaOH concentration, 2 s forward pulse duration, 1 s reverse pulse duration, 50 g L-1 coal concentration, 0.8 mmol L-1 NiCl2 concentration and 2.5 h electrolytic time, a higher desulfurization efficiency (64%) was obtained compared with the common electrochemical desulfurization (ECDS) process using a Pt electrode. By analyzing and comparing the coal samples and electrolytes before and after desulfurization it was indicated that the removed S from the coal sample in the form of gaseous H2S was mainly converted into Na2S and Na2Sx and boron (B) recycling was realized during coal desulfurization. Particularly, the combustion characteristics of coal were improved after desulfurization. Finally, the desulfurization mechanism was proposed. All these results indicated that the desulfurization process via NaBO2 electroreduction with pulse voltage using a BDD thin film electrode is effective and highly promising for coal desulfurization.
ANIONIC ZIRCONIUM AND HAFNIUM BOROHYDRIDE COMPLEXES
Makhaev, V. D.,Borisov, A. P.,Boiko, G. N.,Tarasov, B. P.
, (1990)
Zirconium and hafnium tetrachlorides react with NaBH4 in dimethoxyethane (DME) to give .These compounds react with Bu4NBH4 and Ph4PBH4 to give (R4E).Bidentate and tridentate BH4(1-) occur in (1-) according to IR spectr