NaBH4 hydrolysis performance and kinetic evaluation of synthetic Co-Mn-Pt catalyst prepared with different supports

Öz

In this study, Co0.92-xMn0.08Ptx/TiO2 and Co0.92-xMn0.08Ptx/Al2O3 nano catalysts were synthesized. Impregnation method was applied for the supported catalyst synthesis. Catalyst’s abilities were tested on decomposing of NaBH4 and produce hydrogen with high rate. Transmission and scanning electron microscopies, X-ray diffraction (XRD), surface area and porosity (Brunauer Emmett Teller) and energy dispersion X-ray spectroscopy techniques are used to determine the catalyst properties. Tests prove that the catalyst active sites and support are fit well and embeded strongly. 40 mg Co0.85Mn0.08Pt0.07/TiO2 catalyst results in 6,250 mL H2/min.gcat hydrogen production rate with 5 mL (0.525 M) NaBH4 at 22°C. Different NaOH, catalyst, NaBH4 amounts and temperatures were investigated to obtain kinetis data. Optimum NaOH amount was obtained as 0.15 M for the hydrolysis reaction. Results reveals that the catalyst amounts mainly change the rate whereas hydrolysis reaction occurs according to zero order for NaBH4. Activation energies of Co0.85Mn0.08Pt0.07 containing TiO2 and Al2O3 supported catalysts were calculated as 34.19 and 40.02 kJ/mol, respectively.

Anahtar Kelimeler

• NaBH4
• hydrolysis
• supported catalyst
• kinetic

Proje Numarası

MUH19001.19.001

Farklı destekler ile hazırlanan sentetik Co-Mn-Pt katalizörünün NaBH4 hidroliz performansı ve kinetik değerlendirmesi

Öz

Bu çalışmada Co0,92-xMn0,08Ptx/TiO2 ve Co0,92-xMn0,08Ptx/Al2O3 nano katalizörleri sentezlenmiştir. Destekli katalizörlerin üretilmesinde impregnasyon tekniği kullanılmıştır. Katalizörlerin hidroliz yöntemi ile NaBH4’ü parçalararak yüksek hızda hidrojen üretme yetenekleri belirlenmiştir. Katalizörlerin özelliklerinin belirlenmesi için geçirimli ve taramalı electron mikroskopları (TEM ve SEM), X-ışını difraktometresi (XRD), yüzey alanı ölçüm ve gözenek dağılımı (Brunauer Emmett Teller) analizleri, enerji dağılım spektroskopisi (EDX) ve hidroliz testleri gerçekleştirilmiştir. Testler destek ile aktif bileşenin birbiri ile iyi bir uyum içinde ve sıkıca tutunmuş halde olduğunu göstermiştir. TiO2 destek ile aktivitenin daha yüksek olduğu ve 22 ˚C sıcaklıkta 40 mg Co0,85Mn0,08Pt0,07/TiO2 katalizör ile gerçekleştirilen hidroliz testlerinde 5 mL (0,525 M) NaBH4 çözeltisinin hidrojen üretim hızı 6.250 mL H2/min.gkat olarak bulunmuştur. Değişik NaOH, NaBH4 miktarları ve sıcaklıklarda kinetik çalışmalar yapılmıştır. Hidroliz tepkimesi için uygun NaOH miktarı 0,15 M olarak tespit edilmiştir. Tepkime hızı üzerinde katalizör miktarının etkin, NaBH4 miktarına göre ise sıfırıncı dereceden kinetiğe sahip olduğu belirlenmiştir. Co0,85Mn0,08Pt0,07 içerikli katalizörlerin TiO2 ve Al2O3 destekleri için sırasıyla 34,19 ve 40,02 kJ/mol aktivasyon enerjisine sahip olduğu tespit edilmiştir.

Anahtar Kelimeler

• NaBH4
• hidroliz
• destekli katalizör
• kinetik

Destekleyen Kurum

Hitit Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü

Proje Numarası

MUH19001.19.001

Teşekkür

Bu çalışma Hitit Üniversitesi BAP MUH19001.19.001 numaralı projesi tarafından desteklenmiştir.

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