Ni-Sepiolit Katalizörler Üzerinde CO2 Metanasyonu

Year 2021, Issue: 28, 1399 - 1403, 30.11.2021

Tuğba Yarbaş , Nezihe Ayas

https://doi.org/10.31590/ejosat.1015748

Abstract

Bu çalışmada çevreye zararlı karbondioksit gazının değerli bir yakıt olan metana dönüşümünü artırmak için yeni katalizörlerin geliştirilmesi amaçlandı. Destek malzemesi olarak doğal bir kil minerali olan sepiolit (SEP) kullanılarak; %6-8 (ağırlık-ağırlık) Ni içeren katalizörler emdirme yöntemiyle hazırlandı. Katalizörler, XRD ve FT-IR analizi ile karakterize edildi. Karbon dioksitin katalitik hidrojenasyonuyla metan üretimi için reaksiyon koşulları şu şekilde belirlendi: H2/CO2 = 4 molar oranı; atmosfer basıncında 300-600°C sıcaklık aralığı. Çıkış gaz karışımı µGC kullanılarak analiz edildi. Katalizörlerin aktiviteleri karbondioksit dönüşümü ve metan seçiciliği açısından belirlendi. %6Ni/SEP ve %8 Ni/SEP, 400°C'de sırasıyla %65,76 ve %68,42 karbondioksit dönüşümü sağladı. Ek olarak, her iki katalizör de 300 ve 400°C'de (>%98) yüksek metan seçiciliği sergiledi.

Keywords

CO2 metanasyonu, Sepiyolit, Nikel, Emdirme, Katalizör

CO2 Methanation Over Ni-Sepiolite Catalysts

Abstract

In this study, it was aimed to develop new catalysts to increase the conversion of environmentally harmful carbon dioxide gas to methane which is a valuable fuel. By using a natural clay mineral sepiolite (SEP) as support material; 6-8% (weight-weight) Ni-containing catalysts were prepared by impregnation. Catalysts were characterized by XRD and FT-IR analysis. Reaction conditions of catalytic hydrogenation of carbon dioxide for methane production were determined as: H2/CO2 = 4 molar ratio, the temperature range of 300-600°C at atmospheric pressure. The output gas mixture was analyzed using the µGC. The activities of the catalysts were determined in terms of carbon dioxide conversion and methane selectivity. 6%Ni/SEP and 8%Ni/SEP provided 65.76% and 68.42% carbon dioxide conversion at 400°C, respectively. In addition, both catalysts exhibited high methane selectivity at 300 and 400°C (>98%).

Keywords

CO2 methanation, Sepiolite, Nickel, Impregnation, Catalyst

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