Transforming ladle furnace slag into an efficient catalyst for hydrogen production by ammonia decomposition

Samira Fatma Kurtoğlu Öztulum

Makale detayları

Transforming ladle furnace slag into an efficient catalyst for hydrogen production by ammonia decomposition

Yazarlar:

Samira Fatma Kurtoğlu Öztulum

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Katalitik Aktivite

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.14 Issue 2, pp.532-541

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001345079

pISSN:

2564-6605

Anahtar kelimeler:

Özet:

 Ladle furnace slag LFS, a byproduct of steel production, was modified via HCl treatment and calcination to obtain an efficient catalyst for ammonia decomposition. The unmodified catalyst LFS-C500 and its modified counterpart MLFS-C500 were thoroughly characterized by a combination of techniques, including temperature programmed reduction TPR, X-ray diffraction XRD, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy SEMEDX, and X-ray fluorescence XRF. MLFS-C500 outperformed LFS-C500, achieving 96.3 ammonia conversion at 700 C and a space velocity of 6 000 ml NH₃h  gcat, with a lower activation energy 131.7 kJmol compared to LFS-C500 153.0 kJmol. The superior performance of MLFS-C500 is attributed to its higher iron content, which successfully forms Fe crystallites upon reduction in H2, and its enhanced surface structure, resulting from the removal of calcium compounds upon HCl modification. This work demonstrates how an industrial waste can be effectively valorised into low-cost catalysts for COx-free hydrogen production.

 Ladle furnace slag LFS, a byproduct of steel production, was modified via HCl treatment and calcination to obtain an efficient catalyst for ammonia decomposition. The unmodified catalyst LFS-C500 and its modified counterpart MLFS-C500 were thoroughly characterized by a combination of techniques, including temperature programmed reduction TPR, X-ray diffraction XRD, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy SEMEDX, and X-ray fluorescence XRF. MLFS-C500 outperformed LFS-C500, achieving 96.3 ammonia conversion at 700 C and a space velocity of 6 000 ml NH₃h  gcat, with a lower activation energy 131.7 kJmol compared to LFS-C500 153.0 kJmol. The superior performance of MLFS-C500 is attributed to its higher iron content, which successfully forms Fe crystallites upon reduction in H2, and its enhanced surface structure, resulting from the removal of calcium compounds upon HCl modification. This work demonstrates how an industrial waste can be effectively valorised into low-cost catalysts for COx-free hydrogen production.

 Ladle furnace slag LFS, a byproduct of steel production, was modified via HCl treatment and calcination to obtain an efficient catalyst for ammonia decomposition. The unmodified catalyst LFS-C500 and its modified counterpart MLFS-C500 were thoroughly characterized by a combination of techniques, including temperature programmed reduction TPR, X-ray diffraction XRD, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy SEMEDX, and X-ray fluorescence XRF. MLFS-C500 outperformed LFS-C500, achieving 96.3 ammonia conversion at 700 C and a space velocity of 6 000 ml NH₃h  gcat, with a lower activation energy 131.7 kJmol compared to LFS-C500 153.0 kJmol. The superior performance of MLFS-C500 is attributed to its higher iron content, which successfully forms Fe crystallites upon reduction in H2, and its enhanced surface structure, resulting from the removal of calcium compounds upon HCl modification. This work demonstrates how an industrial waste can be effectively valorised into low-cost catalysts for COx-free hydrogen production.

 Pota ocağı cürufu LFS, çelik üretiminin bir yan ürünü olup, HCl ile muamele ve kalsinasyon yoluyla amonyak ayrışması için verimli bir katalizör haline getirilmiştir. Tepkimeden önce ve sonra modifiye edilmemiş katalizör LFS-C500 ve modifiye edilmiş katalizör MLFS-C500, sıcaklık programlı indirgeme TPR, X-ışını kırınımı XRD, enerji dağılımlı X-ışını spektroskopisi ile taramalı elektron mikroskobu SEMEDX ve X-ışını floresansı XRF gibi tekniklerle ayrıntılı bir şekilde karakterize edilmiştir. MLFS-C500, 700 Cde ve 6000 ml NH₃h  gkat boşluk hızında 96,3 amonyak dönüşümü sağlayarak, LFS-C500den daha üstün bir performans sergilemiştir. Ayrıca, MLFS-C500 131.7 kJmol, LFS-C500e 153.0 kJmol kıyasla daha düşük bir aktivasyon enerjisi göstermiştir. MLFS-C500ün üstün performansı, modifikasyon ile kalsiyum içeren bileşiklerin giderilmesi sonucu artan demir içeriği ve bu demir içeriğinin başarılı bir şekilde H2 ile indirgeme sırasında Fe kristalitlerine dönüştürülmesi ile gelişmiş yüzey yapısına atfedilmiştir. Bu çalışma, endüstriyel atıkların COx açığa çıkarmadan hidrojen üretimi için düşük maliyetli katalizörlere nasıl etkin bir şekilde dönüştürülebileceğini göstermektedir.

Makale detayları

Transforming ladle furnace slag into an efficient catalyst for hydrogen production by ammonia decomposition

Yazarlar:

Samira Fatma Kurtoğlu Öztulum

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Katalitik Aktivite

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.14 Issue 2, pp.532-541

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001345079

pISSN:

2564-6605

Ammonia Decomposition

Hydrogen Storage

Heterogeneous Catalysis

Ladle Furnace Slag

Catalyst CharacterizationAmonyak Bozunması

Hidrojen Depolama

Heterojen Kataliz

Pota Ocağı Cürufu

Katalizör Karakterizasyonu

Sayı

Makale detayları

Yazarlar: Samira Fatma Kurtoğlu Öztulum

Yayıncı: Nigde Omer Halisdemir University

Ana Başlıklar: Katalitik Aktivite

Dergi: Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.14 Issue 2, pp.532-541

Belge Tipi: Makale

Yayın Tarihi: 4/2025

Belge Dili: İngilizce

Document ID (Org No.): 2001345079

pISSN: 2564-6605

Sayı

Yazarlar:

Samira Fatma Kurtoğlu Öztulum

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Katalitik Aktivite

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.14 Issue 2, pp.532-541

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001345079

pISSN:

2564-6605