Für den Inhalt dieser Seite ist eine neuere Version von Adobe Flash Player erforderlich.

Adobe Flash Player herunterladen

Gesamt: 529774     Heute: 220     Gestern: 377     Online: 5     
News Forum Clanwars Clanawards Rules Gästebuch Squads & Teams Impressum Contact Links
 
 
 
 
News... | Anmeldung | Wir sind in der ESL | ...
Forum » Allgemein » Off-Topic » Activated carbons from coal

[ Antwort erstellen ]
Activated carbons from coal
dingxinda
Grünschnabel

User Pic

Posts: 21
# 19.01.2021 - 03:39:57
    zitieren



Effect of ammonia and boron modifications on the surface and hydrogen sorption characteristics of activated carbons from coal[url=https://www.coalactivatedcarbon.com/]coal activated charcoal powder[/url]

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. [url=https://www.granular-activated-carbon.com/]granular activated carbon suppliers uk[/url]The 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.
[ Antwort erstellen ]
 
Downloads Kontakt zu Uns Impressum Membermap Clanawards Teams & Squads Clanwars Links Gästebuch Userliste Forum News Nach Oben
Kontakt zu UnsImpressumMembermapClanawardsTeams & SquadsClanwarsLinksGästebuchUserlisteForum News Ilch Clanskript und ModsUnderdogs360.com A Xbox Live Clan Underdogs360.com A Xbox Live Clan