Removal of Ammonia Gas Using Chabazite Type Natural Zeolite

Öz

In this study, chabazite (CHA) from Bala and that of cation (Na+, K+, Ca2+ and Mg2+) exchanged and hydrochloric acid activated forms were investigated to demonstrate their possible usability in the ammonia removal from the environment. Cation exchanged and acid activated forms were prepared using 1.0 M solutions of KNO3, NaNO3, Mg(NO3)2, Ca(NO3)2 and 0.1 M and 1.0 M solutions of HCl at 90 oC for 5 h, respectively. The thermal and structural properties of all samples were characterized by TG-DTA, XRD and XRF methods. BET surface areas (231-448 m2 g-1), micropore surface areas (216.2-421.3 m2 g-1) and micropore volumes (0.086-0.169 cm3 g-1) of the chabazite samples were calculated by N2 adsorption isotherms at 77 K. Ammonia adsorption isotherms were obtained at 25 °C by 3Flex-Micromeritics equipment volumetrically. Ammonia adsorption capacities of the chabazite samples (5.699-8.931 mmol g-1) were compared in terms of the induced textural and structural changes as a result of cation exchange and acid activation processes, respectively.

Anahtar Kelimeler

• Adsorption
• Ammonia
• Chabazite

Şabazit Tipi Doğal Zeolit Kullanılarak Amonyak Gazının Uzaklaştırılması

Öz

Bu çalışmada, Bala'dan elde edilen şabazit (CHA) ve katyon (Na+, K+, Ca+2 ve Mg+2) değiştirilmiş ve hidroklorik asitle aktifleştirilmiş formları, ortamdan amonyak giderimindeki olası kullanılabilirliklerini göstermek amacıyla incelendi. Katyon değiştirilmiş ve asitle aktiflenmiş formlar sırasıyla, 1.0 M’lık KNO3, NaNO3, Mg(NO3)2, Ca(NO3)2 ve 0.1 M ve 1.0 M’lık HCl solüsyonları kullanılarak 90 oC'de 5 saat süreyle hazırlandı. Tüm numunelerin termal ve yapısal özellikleri TG-DTA, XRD ve XRF yöntemleri ile belirlendi. Şabazit numunelerinin BET yüzey alanları (231-448 m2 g-1), mikro gözenek yüzey alanları (216.2-421.3 m2 g-1) ve mikro gözenek hacimleri (0.086-0.169 cm3 g-1) 77 K'de elde edilen N2 adsorpsiyon izotermleri ile hesaplandı. Amonyak adsorpsiyon izotermleri 3Flex-Micromeritics cihazı ile 25 °C'de volumetrik olarak elde edildi. Şabazit numunelerinin amonyak adsorpsiyon kapasiteleri (5.699-8.931 mmol g-1), sırasıyla katyon değişimi ve asit aktivasyon işlemlerinin neden olduğu içeriksel ve yapısal değişiklikler açısından karşılaştırıldı.

Anahtar Kelimeler

• adsorpsiyon
• şabazit
• amonyak

Kaynakça

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