Hidrojen üretimi için aktif karbon destekli kobalt katalizörü: sentez ve karakterizasyon

Yıl 2024, Cilt: 26 Sayı: 2, 455 - 471, 15.07.2024

Selma Ekinci Erhan Onat

https://doi.org/10.25092/baunfbed.1297146

Öz

Bu çalışmada, sodyum borhidrürün (NaBH4) hidrolizi yoluyla hidrojen üretmek için aktif karbonla desteklenen bir kobalt katalizörü kullanıldı. İlk olarak, hidrotermal ön işlem ile MDF tozundan hidrokömür üretildi. Daha sonra, aktif karbon üretimi için ideal parametreler (aktifleştirici yüzdesi, aktivasyon süresi, fırınlanma süresi ve sıcaklık) belirlendi. Aktif karbon sentezi için en iyi koşullar iyot sayısı ölçümlerine göre %70 aktifleştirici oranı, 24 saat aktivasyon süresi, 45 dakika fırınlanma süresi ve 700 ⁰C sıcaklık olarak belirlendi. İyot sayısı optimum koşullarda 929 mg/g olarak ölçüldü., Kobalt katalizörü ile optimum koşullarda üretilmiş aktif karbon (destek maddesi) birleştirildi. Katalizörün yapısını değerlendirmek için DT/TGA, FT-IR, SEM ve EDX analizleri kullanıldı. Destekleyici malzeme oranı, NaOH konsantrasyonu, katalizör miktarı ve NaBH4 konsantrasyonu, katalizör sentezinde incelenen değişkenlerdir. Katalizör sentezi için optimum parametreler, %70 destek malzemesi, %5 NaOH, 40 mg katalizör ve %2 NaBH4 konsantrasyonu olarak belirlendi. Bu koşullarda sentezlenen katalizör ile hidrojen üretim hızı 8592.8 ml/g.dk olarak hesaplandı. Farklı sıcaklıklarda gerçekleştirilen hidroliz reaksiyonları sonucunda reaksiyonun n. dereceden ve aktivasyon enerjisinin de 31.19 kJ/mol olduğu belirlendi. Altıncı kullanımdan sonra bile katalizör aktivitesi tekrar tekrar test edildiğinde %100 verim elde edildi.

Anahtar Kelimeler

Co@AC katalizör, Destekli katalizör, Hidrojen, Sodyum borhidrür

Activated carbon assisted cobalt catalyst for hydrogen production: synthesis and characterization

Öz

In this work, a cobalt catalyst supported by activated carbon was used to produce hydrogen through the hydrolysis of sodium borohydride (NaBH4). First, hydrochar was produced from MDF powder by hydrothermal pretreatment. Then, ideal parameters (activator percentage, activation time, baking time, and temperature) for activated carbon production were determined. The best conditions for the synthesis of activated carbon were found to be a 70% activator rate, 24 hours of activation time, 45 minutes of baking time, and 700 ⁰C temperature, according to iodine number measurements. The iodine number was measured as 929 mg/g under optimum conditions. Activated carbon (as a support) produced under optimum conditions was combined with the cobalt catalyst. DT/TGA, FT-IR, SEM, and EDX analyses were used to evaluate the catalyst's structure. Supporting material ratio, NaOH concentration, catalyst amount, and NaBH4 concentration are the variables studied in catalyst synthesis. The trials led to the identification of the optimal catalyst parameters as being 70% support material, 5% NaOH, 40 mg catalyst, and 2% NaBH4 concentration. The hydrogen production rate with the catalyst synthesized in these conditions was determined as 8592.8 ml/g.min. As a result of the hydrolysis reactions carried out at different temperatures, it was determined that the reaction was n. order and the reaction activation energy was 31.19 kJ/mol. Even after the sixth use, 100% efficiency was attained when the catalyst activity was tested repeatedly.

Anahtar Kelimeler

Co@AC catalyst, Supported catalyst, Hydrogen, Sodium borohydride

Kaynakça

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