Browsing by Author "Fangaj, Enis"

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Citation - WoS: 42
Citation - Scopus: 46
Apricot Kernel Shell Waste Treated With Phosphoric Acid Used as a Green, Metal-Free Catalyst for Hydrogen Generation From Hydrolysis of Sodium Borohydride
(PERGAMON-ELSEVIER SCIENCE LTD, 2020) Fangaj, Enis; Ceyhan, Ayhan Abdullah
In this study, grinded apricot kernel shell (GAKS) biobased waste was used for the first time as a cost-effective, efficient, green and metal-free catalyst for hydrogen generation from the hydrolysis reaction of sodium borohydride (NaBH4). For the hydrogen production by NaBH4 hydrolysis reaction, GAKS was treated with various acids (HCl, HNO3, CH3COOH, H3PO4), salt (ZnCl2) and base (KOH). As a result, the phosphoric acid (H3PO4) demonstrated better catalytic activity than other chemical agents. The hydrolysis of NaBH4 with the GAKS-catalyst (GAKS(cat)) was studied depending on different parameters such as acid concentration, furnace burning temperature and time, catalyst amount, NaBH4 concentration and hydrolysis reaction temperature. The obtained GAKS(cat) was characterized by ICP-MS, elemental analysis, TGA, XRD, FT-IR, Boehm, TEM and SEM analyses and was evaluated for its catalytic activity in the hydrogen production from the hydrolysis reaction of NaBH4. According to the results, the optimal H3PO4 percentage was found as 15%. The maximum hydrogen generation rate from the hydrolysis of NaBH4 with the GAKS(cat) was calculated as 20,199 mL min(-1) g(cat)(-1) As a result, it can be said that GAKS treated with 15% H3PO4 as a catalyst for hydrogen production is an effective alternative due to its high hydrogen production rate. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Biyobazlı Katalizör Kullanılarak Sodyum Borhidrür'den Hidrojen Üretimi
(Konya Teknik Üniversitesi, 2021) Fangaj, Enis; Ceyhan, Ayhan Abdullah
Bu çalışmada, biyobazlı atık olan öğütülmüş kayısı çekirdeği kabuğu (KÇK) ilk kez sodyum borhidrürün (NaBH4) hidroliz tepkimesinden hidrojen üretiminde bir katalizör olarak kullanılmıştır. KÇK katalizörü ucuz, verimli, temiz olmakla birlikte metal içermemektedir. NaBH4 hidrolizinden hidrojen üretimi için, KÇK çeşitli asitler (HCl, HNO3 , CH3COOH, H3PO4), tuz (ZnCl2) ve baz (KOH) ile muamele edilmiştir. Fosforik asidin (H3PO4) diğer kimyasal ajanlardan daha iyi katalitik aktivite gösterdiği belirlenmiştir. NaBH4'ün KÇK katalizörü (KÇKkat) ile hidrolizi, asit konsantrasyonu, fırın sıcaklığı ve süresi, katalizör miktarı, NaBH4 konsantrasyonu ve hidroliz reaksiyon sıcaklığı gibi farklı parametrelere bağlı olarak incelenmiştir. Elde edilen KÇKkat , ICP-MS, element analiz, TGA, XRD, FT-IR, Boehm titrasyonu, TEM, Partikül boyut analizi ve SEM analizleri ile karakterize edilmiş ve NaBH4'ün hidrolizinden hidrojen üretiminde katalitik aktivitesi değerlendirilmiştir. Sonuçlara göre, optimum H3PO4 yüzdesi %15 olarak bulunmuştur. KÇK kat ile NaBH4'ün hidrolizinden maksimum hidrojen üretim hızı 20,199 ml dk-1 gkat-1 olarak hesaplanmıştır. Sonuç olarak, hidrojen üretimi için bir katalizör olarak %15 H3PO4 ile muamele edilen KÇK'nın, yüksek hidrojen üretim hızı nedeniyle etkili bir alternatif olduğu tespit edilmiştir.
Citation - WoS: 53
Citation - Scopus: 55
A Study on Hydrogen Generation From Nabh4 Solution Using Co-Loaded Resin Catalysts
(PERGAMON-ELSEVIER SCIENCE LTD, 2020) Ceyhan, Ayhan Abdullah; Edebali, Serpil; Fangaj, Enis
Hydrogen production via chemical processes has gained great attention in recent years. In this study, Co-based complex catalyst obtained by adsorption of Co metal to Amberlite IRC-748 resin and Diaion CR11 were tested for hydrogen production from alkaline NaBH4 via hydrolysis process. Their catalytic activity and microstructure were investigated. Process parameters affecting the catalytic activity, such as NaOH concentration, Co percentage and catalyst amount, as well as NaBH4 concentration and temperature were investigated. Furthermore, characteristics of these catalysts were carried out via SEM, XRD and FT-IR analysis. Hydrogen production rates equal to 211 and 221 ml min(-1) gcat(-1) could be obtained with Amberlite IRC-748 resin and Diaion CR11 Co based complex catalysts, respectively. The activation energies of the catalytic hydrolysis reaction of NaBH4 were calculated as 46.9 and 59.42 kJ mol(-1) for Amberlite IRC-748 resin and Diaion CR11 based catalysts respectively kJ mol(-1) from the system consisting of 3% Co, 10 wt% NaBH4 and 7 wt% NaOH as well as 50 mg catalyst dosage. It can be concluded that Co-based resins as catalysts for hydrogen production is an effective alternative to other catalysts having higher rate. (C) 2020 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
Citation - WoS: 18
Citation - Scopus: 19
The Use of Metallurgical Waste Sludge as a Catalyst in Hydrogen Production From Sodium Borohydride
(PERGAMON-ELSEVIER SCIENCE LTD, 2020) Fangaj, Enis; Ali, Abdirahman Abib; Güngör, Furkan; Bektaş, Selinay; Ceyhan, Ayhan Abdullah
In this study, the metallurgic sludge which contained oil and was obtained as waste of grinding, sharpening and milling parts was used in the production of hydrogen (H-2) from sodium borohydride (NaBH4). The hydrolysis of NaBH4 with the metallurgic sludge catalyst was investigated depending on several parameters such as sodium hydroxide (NaOH) concentration, catalyst amount, NaBH4 concentration and temperature. The obtained metallurgic sludge catalyst was characterized by the XRD, FT-IR and SEM techniques and was evaluated for its activity in the H-2 generation from NaBH4 hydrolysis. The maximum H-2 production rate from the hydrolysis of NaBH 4 with the metallurgic sludge catalyst was calculated as 9366 ml min(-1). g(cat-1)(-1). The value of activation energy was found as 48.05 kJ mol(-1). (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.