Influence of preparation conditions on the morphology of hollow silica–alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane

Umegaki, Tetsuo; Imamura, Shunsuke; Toyama, Naoki; Kojima, Yoshiyuki

doi:10.1016/j.micromeso.2014.05.041

Cited by 22 publications

(10 citation statements)

References 45 publications

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“…The acid sites can generally increase with the increase of four-coordinated aluminum species, which are well-dispersed active species. We investigated the influence of various preparation conditions such as promoters of sol-gel reaction for the formation of the shell of the hollow spheres, alcohol solvents, aluminum precursors, and so on, on the dispersion of the active aluminum species of hollow silica-alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane [60][61][62].…”

Section: Improvement Of Dispersion Of Active Species Of Hollow Silicamentioning

confidence: 99%

Role of Interparticle Space in Hollow Spheres of Silica-Based Solid Acids on Their Acidic Properties and Activity for Hydrolytic Dehydrogenation of Ammonia Borane

Umegaki¹,

Toyama²,

Kojima³

2018

Porosity - Process, Technologies and Applications

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Porous materials with micropores and mesopores have attracted much attention as materials potentially applied in various fields such as absorbents, catalysts, energy storage, and so on. The kind of materials showed intrinsic properties compared with other types of materials such as fine particles. This chapter reviewed our recent research about hollow silica-alumina composite spheres for the hydrolytic dehydrogenation of ammonia borane. This chapter has mainly discussed about the role of interparticle space in the hollow spheres on their acidic properties and activity for the hydrolytic dehydrogenation of ammonia borane.

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Section: Improvement Of Dispersion Of Active Species Of Hollow Silicamentioning

confidence: 99%

Role of Interparticle Space in Hollow Spheres of Silica-Based Solid Acids on Their Acidic Properties and Activity for Hydrolytic Dehydrogenation of Ammonia Borane

Umegaki¹,

Toyama²,

Kojima³

2018

Porosity - Process, Technologies and Applications

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“…Therefore, the effects of different extraction times (10,20,30,40, 50 and 60 min) were investigated. As shown in Figure 6, The recoveries improved slightly from 10 to 20 min, then increased sharply and reached the highest recovery at 30 min (all these compounds have recoveries higher than 70%).…”

Section: Optimization Of Extraction Timementioning

confidence: 99%

“…It can greatly improve the attractiveness of food, cosmetic and tobacco products [9]. Coumarin has been shown to cause hepatoxicity in animals and in the USA its use as a food additive has been banned since 1956 [10]. The Framework Convention on Tobacco Control (FCTC) recommends that the coumarin should be restricted or banned [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Coumarin and Its Derivatives in Tobacco Products by Liquid Chromatography-Tandem Mass Spectrometry

et al. 2016

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Abstract:In this paper an analytical method based on high performance liquid chromatography coupled to tandem mass spectrometry (HPLC-MS/MS) for the determination of coumarin and its derivatives in tobacco products was developed. The MS/MS fragmentation pathways of the eight coumarins were elucidated. The new analytical method was defined based on two main axes, an extraction procedure with acetonitrile and analyte detection performed by HPLC-MS/MS in electron impact mode. The excellent selectivity and sensitivity achieved in multiple reaction monitoring (MRM) mode allowed satisfactory confirmation and quantitation for the coumarin flavor additives. Under the optimized gradient elution conditions, it took only 4.5 min to separate all eight coumarins. Good linearity for all the analytes were confirmed by the correlation coefficient r 2 , ranging from 0.9987 to 0.9996. The limits of detection (LODs) and limits of quantitation (LOQs) of these compounds were in the range of 0.5-1.7 µg/kg and 1.7-5.2 µg/kg, respectively. The average recoveries at three spiked levels (LOQ, 1.5LOQ, 2LOQ) were all in the range of 69.6%-95.1% with RSDs (n = 6) lower than 5.3%. The method of HPLC-MS/MS developed in this study was initially applied to the research of coumarin flavor additives in tobacco products collected from the located market in Beijing from China and proved to be accurate, sensitive, convenient and practical.

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“…Hosokawa Powder Technology Foundation ANNUAL REPORT No.23(2015) [206][207][208][209] Young Researcher Scholarship Report -207 - [4] L(+) [5] L(+)…”

Section: ．結果と考察mentioning

confidence: 99%

Influence of preparation conditions on the morphology of hollow silica–alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane

Cited by 22 publications

References 45 publications

Role of Interparticle Space in Hollow Spheres of Silica-Based Solid Acids on Their Acidic Properties and Activity for Hydrolytic Dehydrogenation of Ammonia Borane

Role of Interparticle Space in Hollow Spheres of Silica-Based Solid Acids on Their Acidic Properties and Activity for Hydrolytic Dehydrogenation of Ammonia Borane

Simultaneous Determination of Coumarin and Its Derivatives in Tobacco Products by Liquid Chromatography-Tandem Mass Spectrometry

Fabrication of Hollow Spheres of Solid Acids and Control of Their Fine Structure

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