- Manas Fen Bilimleri Dergisi
- Vol: 9 Issue: 2
- Boric acid versus boron trioxide as catalysts for green energy source H2 production from sodium boro...
Boric acid versus boron trioxide as catalysts for green energy source H2 production from sodium borohydride methanolysis
Authors : Sahin Demirci, Betül Ari, Sultan Bütün Şengel, Erk Inger, Nurettin Sahiner
Pages : 142-152
Doi:10.51354/mjen.980286
View : 25 | Download : 6
Publication Date : 2021-12-06
Article Type : Research
Abstract :Here, boric acid (H 3 BO 3 ) and its dewatered form, boron trioxide (B 2 O 3 ) were tested as catalysts for hydrogen (H 2 ) evolution in the methanolysis of sodium borohydride (NaBH 4 ) in methanol. Parameters such as catalyst types and their amounts, NaBH 4 concentration, and the reaction temperature affecting the hydrogen generation rate (HGR) were studied. It has been found that H 3 BO 3 and B 2 O 3 catalyzed methanolysis reaction of NaBH 4 follow up first-order kinetics relative to the concentration of NaBH 4 . Furthermore, the conversion and activity of these catalysts were examined to determine their performance in ten consecutive use. Interestingly, H 3 BO 3 and B 2 O 3 have demonstrated superior catalytic performances in methanolysis of NaBH 4 comparing to the studies published in literature with the activation energy of respectively 22.08 kJ.mol -1 , and 23.30 kJ.mol -1 in H 2 production. The HGR was calculated as 6481 mL.min -1 .g -1 and 5163 mL.min -1 .g -1 for H 3 BO 3 and B 2 O 3 catalyst, respectively for 50 mg catalyst at 298 K. These results are comparably better than most metal nanoparticle catalysts used for H 2 production in addition to the naturally occurring boron-based environmentally friendliness of these materials.Keywords : boric acid, boron oxide, catalyst, hydrogen production, NaBH4 methanolysis, natural catalyst