dingxinda
Yeni Üye
Kayıt Tarihi: 2021-13-Ocak
Aktif Durum: Pasif
Gönderilenler: 30
|
| Gönderen: 2021-19-Ocak Saat 06:16 | Kayıtlı IP
|
|
|
Effect of ammonia and boron modifications on the surface
and hydrogen sorption characteristics of activated
carbons from
coalcoal
activated charcoal powder
In this study, a synthesis procedure was adopted to
prepare boron following nitrogen modified activated
carbons from coals collected from Kilimli Zonguldak in
Turkey. The effects of ammonia and boron modification on
the surface and hydrogen sorption characteristics of
these coal based activated carbons were investigated. The
modification process was carried out by treatment of
potassium hydroxide modified activated carbons with
ammonia solution, followed by borax decahydrate solutions
at various concentrations (0.025–0.1 M). The porous
structure of the samples was characterized by using N2
adsorption-desorption data measured at 77.4 K for the
relative pressures in the range P/P0 = 0–1. The
resulting samples were in irregular structures having
high microporosity. The surface area of the sample
characterized by the Brunauer-Emmett-Teller model, having
a value of 2195 m2/g by ammonia treatment, increased to
3037 and 2661 m2/g after treatments with the 0.075 M and
0.1 M borax decahydrate solutions, respectively. Hydrogen
uptake capacities in the range 2.77–4.14 % wt were
obtained by borax decahydrate treatments of the ammonia
modified samples, whereas the ammonia treated sample had
a capacity of 2.35 % wt before boron modifications. 0.075
M borax decahydrate-ammonia treated sample had the
highest surface area and total pore volumes among all the
other samples obtained. Increasing borax decahydrate
concentration in the range 0.025–0.075 M resulted in the
increase of hydrogen uptake capacities due to the
improvement in surface characteristics including
microporous structure and the affinities of nitrogen and
boron to hydrogen. carbon.com/">granular activated carbon suppliers
ukThe process adopted for boron modification
followed by ammonia treatment of the potassium hydroxide
activated coal-based carbons yielded improved surface and
hydrogen sorption characteristics as compared to the
unmodified carbons.
|
Aktif Konular 
Üye Listesi 
Arama 
Yardım
Kayıt Ol 
Giriş
Gitar-tr.com FORUM : Gitar-tr.com Tanisma Toplantisi !!!
Konu: Hydrogen sorption characteristics of ac
