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

Selma Ekinci; Erhan Onat

Makale detayları

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

Yazarlar:

Selma Ekinci | Erhan Onat

Yayıncı:

Balıkesir University

Ana Başlıklar:

Malzeme Bilimi ve Teknolojileri

Dergi:

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.26 Issue 2, pp.455-471

Belge Tipi:

Makale

Yayın Tarihi:

7/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001322998

pISSN:

1301-7985

Anahtar kelimeler:

Özet:

 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 mgg under optimum conditions. Activated carbon as a support produced under optimum conditions was combined with the cobalt catalyst. DTTGA, FT-IR, SEM, and EDX analyses were used to evaluate the catalysts 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 mlg.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 kJmol. Even after the sixth use, 100 efficiency was attained when the catalyst activity was tested repeatedly.

 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 mgg under optimum conditions. Activated carbon as a support produced under optimum conditions was combined with the cobalt catalyst. DTTGA, FT-IR, SEM, and EDX analyses were used to evaluate the catalysts 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 mlg.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 kJmol. Even after the sixth use, 100 efficiency was attained when the catalyst activity was tested repeatedly.

 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 mgg under optimum conditions. Activated carbon as a support produced under optimum conditions was combined with the cobalt catalyst. DTTGA, FT-IR, SEM, and EDX analyses were used to evaluate the catalysts 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 mlg.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 kJmol. Even after the sixth use, 100 efficiency was attained when the catalyst activity was tested repeatedly.

 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 mgg olarak ölçüldü., Kobalt katalizörü ile optimum koşullarda üretilmiş aktif karbon destek maddesi birleştirildi. Katalizörün yapısını değerlendirmek için DTTGA, 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 mlg.dk olarak hesaplandı. Farklı sıcaklıklarda gerçekleştirilen hidroliz reaksiyonları sonucunda reaksiyonun n. dereceden ve aktivasyon enerjisinin de 31.19 kJmol olduğu belirlendi. Altıncı kullanımdan sonra bile katalizör aktivitesi tekrar tekrar test edildiğinde 100 verim elde edildi.

Makale detayları

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

Yazarlar:

Selma Ekinci | Erhan Onat

Yayıncı:

Balıkesir University

Ana Başlıklar:

Malzeme Bilimi ve Teknolojileri

Dergi:

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.26 Issue 2, pp.455-471

Belge Tipi:

Makale

Yayın Tarihi:

7/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001322998

pISSN:

1301-7985

Co@AC catalyst

Supported catalyst

Hydrogen

Sodium borohydrideCo@AC katalizör

Destekli katalizör

Hidrojen

Sodyum borhidrür

Sayı

Makale detayları

Yazarlar: Selma Ekinci | Erhan Onat

Yayıncı: Balıkesir University

Ana Başlıklar: Malzeme Bilimi ve Teknolojileri

Dergi: Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.26 Issue 2, pp.455-471

Belge Tipi: Makale

Yayın Tarihi: 7/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001322998

pISSN: 1301-7985

Sayı

Yazarlar:

Selma Ekinci | Erhan Onat

Yayıncı:

Balıkesir University

Ana Başlıklar:

Malzeme Bilimi ve Teknolojileri

Dergi:

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.26 Issue 2, pp.455-471

Belge Tipi:

Makale

Yayın Tarihi:

7/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001322998

pISSN:

1301-7985