Çisem ÖZ, Bilge COŞKUNER FİLİZ, Aysel KANTÜRK FİGEN

Talaş Magnezyum Atığından Hidrojen Gazı Üretimi ve Hız Profillerinin İncelenmesi

Son yıllarda, yüksek potansiyele sahip olan enerji taşıyıcısı hidrojenin (H2) yakıt olarak kullanımı ve mevcut sistemler ile değiştirilmesine yönelik araştırmalar hız kazanmıştır. H2’nin sıfır emisyonlu üretimi, güvenli depolanması, etkin dağıtımı ve son kullanımda yüksek verimle enerjiye dönüştürülmesi, günlük hayatta kullanımının yaygınlaştırılması için önem arz etmektedir. Hidrojenin üretiminde, fosil temelli kaynaklar yerine sıfır emisyonlu alternatif tekniklerin geliştirilmesi hedeflenmektedir. Özellikle düşük ağırlıklı metaller içerisinden magnezyum (Mg)’un H2 üretiminde, bu hedefe ulaşmak amacıyla kullanılabilecek hammaddeler arasında yer almaktadır. Mg ve Mg alaşımları başta otomotiv, uzay mühendisliği, metalürji ve kimya sektörleri olmak üzere pillerde ve katodik koruma gibi alanlarda kullanılırken, %50’lik kısmı atık olarak oluşmaktadır. Ancak, bu atıkların sadece %33’lük kısmı atık yönetimi kapsamında sınıflandırılarak tekrar kullanımı mümkün olmaktadır. Bu araştırma makalesinde, endüstriyel atık sınıfında yer alan talaş Mg’un H2 gazı üretiminde değerlendirilmesi amaçlanmıştır. Hidroliz reaksiyonu ile gerçekleşen H2 üretiminde, ortamda H+ iyonlarının geçişini hızlandıracak aktivatörün kullanımı gerekli olup ve klorür tuzları, metaller ve asitler bu amaç doğrultusunda tercih edilmektedirler. Farklı konsantrasyonlardaki sirke çözeltilerinin (% 0.8-4 ağ. asetik asit, CH3COOH) hidroliz ortamında aktivatör olarak kullanımı incelenmiştir. Atık Mg talaşından hidrojen üretimi gerçekleştirilmiş ve H2 gazı üretim profilleri aydınlatılmıştır.

Anahtar Kelimeler:

H2 üretimi, atık magnezyum, hidroliz, sirke

Hydrogen Gas Production from Chip Magnesium Waste and Investigation of Rate Profiles

In recent years, researches about the use of hydrogen (H2) as a high-potential energy carrier and replacement with current systems have been enhanced. Production of H2 with zero emission, safe storage, efficient distribution and, highly efficient energy conversion in end-use are the most important factors for popularizing the use of hydrogen energy systems in daily life. The main target is to develop alternative techniques to produced hydrogen with zero emission instead of fossil-based sources. In particular, magnesium (Mg) from light weight metals has been gain attention to achieve this target. While, Mg and Mg alloys are mainly used as a raw material in automotive, space engineering, metallurgy and chemistry sectors, cells and cathodic protection, %50 of raw Mg is formed as a waste. However, only 33% of these wastes are classified based on waste managent and reused is being possible. In this research article, the evaluation of the industrial waste grade Mg chips in the production of H2 gas is studied. H2 production is carried out based on the hydrolysis reaction and it is necessary to use an activator which accelerates the passage of H+ ions and chlorine salts, metals and acids are preferred for this purpose. The usage of different concentrations of vinegar solutions (0.8-4 % wt. acetic acid, CH3COOH) as an activator in hydrolyses meduim was investigated. Hydrogen prodcution was carried our from waste Mg chip and H2 gas production profiles were illuminated.

Keywords:

H2 production, waste magnesium, hydrolysis, vinegar,

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