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Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2026 / Cilt: 36 Sayı: 2

İzobütan dehidrojenasyonunda Cr@MCM-41 katalizörlerinin etkinliğinin incelenmesi

Saliha Çetinyokuş(Gazi University,Ankara,Turkey)0000-0001-9955-6428
Meltem Dogan(Gazı University)0000-0002-5903-2600
Pages
1075–1088
Publication Date
2021-03-05
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Emdirme tekniği ile sentezlenen xCr@MCM-41 katalizörleri için kütlece %4 Cr içeriğinin, yüksek izobüten seçiciliği ve yüksek miktarda monokromat oluşumu açısından uygun bir oran olduğu görülmektedir.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Önemli bir hammadde olan izobütene her geçen gün talebin artması, izobütan dehidrojenasyonunu dikkat çekici bir konuma getirmiştir.
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Key Findings & Data:Bu çalışmada, Cr içeriğinin Cr@MCM-41 katalizör yapısına, kromat türleri ve miktarları üzerine etkilerinin araştırılması amaçlanmıştır.
💡
Conclusion & Impact:Emdirme tekniği ile sentezlenen xCr@MCM-41 katalizörleri için kütlece %4 Cr içeriğinin, yüksek izobüten seçiciliği ve yüksek miktarda monokromat oluşumu açısından uygun bir oran olduğu görülmektedir.
🔬Design:Experimental Field Trial
📍Scope:Comprehensive Sample
⚙️Variables:İzobütan dehidrojenasyonu · Cr@MCM-41 · karakterizasyon

Özet

Önemli bir hammadde olan izobütene her geçen gün talebin artması, izobütan dehidrojenasyonunu dikkat çekici bir konuma getirmiştir. Endotermik denge limitasyonlu bu reaksiyon için katalizör sentezi son derece önemlidir. Cr temelli katalizörler için monokromatların en aktif tür olduğu bilinmektedir. Bu çalışmada, Cr içeriğinin Cr@MCM-41 katalizör yapısına, kromat türleri ve miktarları üzerine etkilerinin araştırılması amaçlanmıştır. Bu amaçla, öncelikle katalizör desteği MCM-41 hidrotermal olarak sentezlenmiş, ardından farklı % kütle oranlarında xCr@MCM-41 (x:4,6,8,10) katalizörleri emdirme tekniği ile hazırlanmıştır. Sentezlenen katalizörlerin, XRD, DR-UV vis, XPS, N2 ads./des. analizleri ile karakterizasyon çalışmaları yürütülmüştür. Cr içeriği arttıkça izobütan dehidrojenasyonu için aktivitesi düşük Cr2O3 kristal oluşumların katalizör yapısında arttığı belirlenmiştir. Reaksiyon için aktif monokromat türü en yüksek oranda 4Cr@MCM-41 katalizörü üzerinde elde edilmiş, kristal oluşumların sadece bu katalizör yapısında gözlenmediği tespit edilmiştir. 4Cr@MCM-41 üzerinde yürütülen katalitik testler(600oC, atmosferik) sonucunda 60. dakikaya kadar yüksek izobütan dönüşümleri(%80), 40. dakika sonrası ise yüksek izobüten seçicilikleri(%95) elde edilmiştir. Emdirme tekniği ile sentezlenen xCr@MCM-41 katalizörleri için kütlece %4 Cr içeriğinin, yüksek izobüten seçiciliği ve yüksek miktarda monokromat oluşumu açısından uygun bir oran olduğu görülmektedir.

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Cite This Article

Çetinyokuş, S., Dogan, M. (2021). İzobütan dehidrojenasyonunda Cr@MCM-41 katalizörlerinin etkinliğinin incelenmesi. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 36 Sayı: 2, 1075–1088. https://doi.org/10.17341/gazimmfd.678990

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  25. Fridman V.Z, Xing R., Investigating the CrOx/Al2O3 dehydrogenation catalyst model: II. Relative activity of the chromium species on the catalyst surface, Applied Catalysis A: General, 530, 154-165, 2017
  26. Fridman V.Z, Xing R., Severance M., Investigating the CrOx/Al2O3 dehydrogenation catalyst model: I. identification and stability evaluation of the Cr species on the fresh and equilibrated catalysts, Applied Catalysis A: General, 523, 39-53, 2016
  27. Li P., Lang W., Xia K., Luan L. Guo Y., The promotion effects of Ni on the properties of Cr/Al catalysts for propane dehydrogenation reaction, Applied Catalysis A: General, 522, 172-179, 2016
  28. Salaeva A.A., Salaev M.A., Vodyankina O. V., Mamontov G. V., Synergistic effect of Cu and Zn modifiers on the activity of CrOx/Al2O3 catalysts in isobutane dehydrogenation, Applied Catalysis A: General, 581, 82-90, 2019
  29. Kim T. H., Kang K. H., Baek M., Song J. H., Hong U.G., Park Choi W.C., Park Y., Song I.K., Dehydrogenation of propane to propylene eith lattice oxygen over CrOy/Al2O3-ZrO2 Catalysts. Molecular Catalysis, 433, 1-7, 2017
  30. Gao X., Lu W., Hu S., Li W., Lu A., Rod-shaped porous alumina-supported Cr2O3 catalyst with low acidity for propane dehydrogenation, Chinese Journal of Catalysis, 40(2), 184-191, 2019
  31. Zhao H., Song H., Miao Z., Chou L., Isobutane dehydrogenation over chromia alumina catalysts prepared from MIL-101: Insight into chromium species on activity and selectivity, Journal of Energy Chemistry, 23(6),708-716, 2014
  32. Nemykina E.I., Pakhomov N.A., Danilevich V.V., Rogov V.A., Zaikovskii V.I., Larina T.V., Molchanov V.V., Effect of chromium content on the properties of a microspherical alümina-chromium catalyst for ısobutane dehydrogenation prepared with the use of a centrifugal thermal activation product of gibbsite, Kinetics and Catalysis, 51 (6), 898-906, 2010
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  34. Li L., Zhu W., Shi L., Liu Y., Liu H., Ni Y., Liu S., Zhau H., Liu Z., The effect of ethanol on the performance of CrOx/SiO2 catalysts during propane dehydrogenation, Chinese Journal of Catalysis, 37, 3, 359-366, 2016
  35. Deng J., Zhang L., Liu C., Xia Y., Dai H., Single-crystalline mesoporous CaO supported Cr–V binary oxides: Highly active catalysts for the oxidative dehydrogenation of isobutane, Catalysis Today, 164(1), 347-352, 2011
  36. Asghari E., Haghighi M., Rahmani F, CO2- Oxidative dehydrogenation of ethane to ethylene over Cr/MCM-41 nanocatalyst synthesized via hydrothermal/impregnation methods: Influence of chromium content on catalytic properties and performance, Journal of Molecular Catalysis A: Chemical, 418-419, 115-124, 2016. 17.Ajayi B.P., Jermy B.R., Ogunronbi K.E., Abussaud B.A., Al-Khattaf S., N-butane dehydrogenation over mono and bimetallic MCM-41 catalysts under oxygen free atmosphere, Catalysis Today, 204, 189-196, 2013
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  39. Cheng Y., Zhou L., Xu J., Miao C., Gao Z., Chromium-based catalysts for ethane dehydrogenation: Effect of SBA-15 support, Microporous and Mesoporous Materials, 234, 370-376, 2016
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