The influence of the pore structure of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane,Inorganic Chemistry Frontiers

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The influence of the pore structure of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-07-28 00:00:00 , DOI: 10.1039/c7qi00338b
Tetsuo Umegaki _{1,

2,

3,

4} , Ryota Ogawa _{1,

2,

3,

4} , Naoki Toyama _{1,

2,

3,

4} , Shinobu Ohki _{4,

5,

6} , Masataka Tansho _{4,

5,

6} , Tadashi Shimizu _{4,

5,

6} , Yoshiyuki Kojima _{1,

2,

3,

4}

Affiliation

The effect of the pore structures of hollow silica–alumina composite spheres on their activity for the hydrolytic dehydrogenation of ammonia borane has been studied. Following a calcination process that resulted in hollow spheres, the spheres’ shells were coated on spherical polystyrene particle templates. The pore structures of the hollow spheres were controlled by adding a surfactant, cetyltrimethylammonium bromide (CTAB); the volume and homogeneity of the mesopores in the shell of the hollow spheres increased with increasing amount of aqueous CTAB solution. The hollow spheres with a large volume and homogeneous mesopores showed high rates of hydrogen evolution from aqueous ammonia borane solution. The highly active hollow spheres prepared with 5 mL of aqueous CTAB solution showed a considerably high turnover frequency (TOF), although the hollow spheres did not have a significantly high BET surface area or a large quantity of acid sites. This suggests that the activity for hydrogen evolution from aqueous ammonia borane solution in the presence of the hollow spheres with homogeneous mesopore structures was unexpectedly high.

中文翻译：

中空二氧化硅-氧化铝复合球的孔结构对其氨硼烷水解脱氢活性的影响

研究了中空二氧化硅-氧化铝复合球的孔结构对其氨硼烷水解脱氢活性的影响。在产生空心球的煅烧过程之后，将球的壳涂在球形聚苯乙烯颗粒模板上。通过添加表面活性剂十六烷基三甲基溴化铵（CTAB）来控制中空球的孔结构。中空球壳中介孔的体积和均匀性随CTAB水溶液的增加而增加。具有大体积和均质中孔的空心球显示出从氨硼烷水溶液中放出氢气的速率很高。用5 mL CTAB水溶液制备的高活性空心球显示出相当高的周转频率（TOF），尽管空心球没有明显高的BET表面积或大量的酸位。这表明在具有均一的中孔结构的空心球的存在下，从氨硼烷水溶液中析氢的活性出乎意料地高。

更新日期：2017-08-10

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