H2S’ün elementel kükürde seçici oksidasyonunda Ti-V-Cr ve Ti-V-Fe katalizörleri
Loading...
Date
2018-06-08
Authors
Taşdemir, H. Mehmet
Journal Title
Journal ISSN
Volume Title
Publisher
Uludağ Üniversitesi
Abstract
Bu çalışmada kompleksleştirme yöntemiyle eşmolar oranda Ti-V-Fe ve Ti-V-Cr katalizörleri sentezlenmiş ve H2S’ün seçici oksidasyon reaksiyonuyla elementel kükürt eldesindeki aktiviteleri incelenmiştir. Katalizörlerin yapısal özellikleri N2 adsorpsiyon-desorpsiyon, XRD, TPR, SEM-EDS analizleri ile belirlenmiştir. Gerçekleştirilen analiz sonuçlarına göre sentezlenen katalizörlerin mezogözenekli yapıya sahip olduğu tespit edilmiştir. Ti-V-Cr katalizörünün kristal yapısı TiO2’in rutile fazı ve Cr2O3 bileşiklerinden oluşurken, Ti-V-Fe katalizörü kompleks bir kristal yapı sergilemiştir. Bu katalizörün yapısında Fe2TiO5, V2O5, FeV2O4, rutile TiO2 ve Fe2O3 bileşikleri görülmüştür. Katalizörlerin katalitik aktiviteleri dolgulu kolon reaktör sisteminde farklı sıcaklık (200°C, 250°C, 300°C) ve stokiyometrik gaz (O2/H2S:0,5) bileşiminde incelenmiştir. Sentezlenen her iki katalizörle de 250°C reaksiyon sıcaklığında % 100 H2S dönüşümü elde edilmiştir. Reaksiyon sıcaklığındaki artış ve azalış katalizör yapısındaki kükürt birikiminin artmasından dolayı H2S dönüşümünde azalmaya sebep olmuştur. Bunun yanı sıra çalışılan tüm şartlarda her iki katalizörle de oldukça yüksek (≥% 97) elementel kükürt seçiciliği elde edilmiştir. Özellikle 200°C sıcaklıkta, yapısında kompleks bileşikleri içeren Ti-V-Fe katalizörü ile (% 73 H2S dönüşümü) Ti-V-Cr katalizörüne kıyasla (% 51 H2S dönüşümü) daha yüksek dönüşüm elde edilmiştir.
In this study, Ti-V-Fe and Ti-V-Cr catalysts were synthesized by complexation method and their activities were investigated for H2S selective oxidation reaction to elemental sulfur. Structural properties of the catalysts were determined by N2 adsorption-desorption, XRD, TPR, SEM-EDS analyzes. According to the analysis results, it has been found that the synthesized catalysts have a mesoporous structure. Ti-V-Fe catalyst exhibits a complex crystal structure, while the crystal structure of the Ti-V-Cr catalyst is comprised of the rutile phase of TiO2 and Cr2O3 compounds. In this catalyst structure, Fe2TiO5, V2O5, FeV2O4, rutile TiO2 and Fe2O3 compounds were observed. The catalytic activities of the catalysts were investigated in a packed column reactor system at different temperatures (200°C, 250°C, 300°C) and stoichiometric gas composition (O2/H2S:0.5). 100% H2S conversion was obtained at 250°C reaction temperature with both catalysts synthesized. The increase and decrease in the reaction temperature led to a decrease in the conversion of H2S obtained with the catalysts due to the increase in sulfur deposition in the catalyst structure. In addition, under all conditions studied, elemental sulfur selectivity was high (≥ 97%) with both catalysts. Especially at 200°C, a higher conversion was obtained with Ti-V-Fe (73% H2S conversion) catalyst which has complex compounds in the structure compared to Ti-V-Cr catalyst (51% H2S conversion).
In this study, Ti-V-Fe and Ti-V-Cr catalysts were synthesized by complexation method and their activities were investigated for H2S selective oxidation reaction to elemental sulfur. Structural properties of the catalysts were determined by N2 adsorption-desorption, XRD, TPR, SEM-EDS analyzes. According to the analysis results, it has been found that the synthesized catalysts have a mesoporous structure. Ti-V-Fe catalyst exhibits a complex crystal structure, while the crystal structure of the Ti-V-Cr catalyst is comprised of the rutile phase of TiO2 and Cr2O3 compounds. In this catalyst structure, Fe2TiO5, V2O5, FeV2O4, rutile TiO2 and Fe2O3 compounds were observed. The catalytic activities of the catalysts were investigated in a packed column reactor system at different temperatures (200°C, 250°C, 300°C) and stoichiometric gas composition (O2/H2S:0.5). 100% H2S conversion was obtained at 250°C reaction temperature with both catalysts synthesized. The increase and decrease in the reaction temperature led to a decrease in the conversion of H2S obtained with the catalysts due to the increase in sulfur deposition in the catalyst structure. In addition, under all conditions studied, elemental sulfur selectivity was high (≥ 97%) with both catalysts. Especially at 200°C, a higher conversion was obtained with Ti-V-Fe (73% H2S conversion) catalyst which has complex compounds in the structure compared to Ti-V-Cr catalyst (51% H2S conversion).
Description
Keywords
Katalizör, H2S, Seçici oksidasyon, Elementel kükürt, Catalyst, Selective oxidation, Elemental sülfür
Citation
Taşdemir, H. M. (2018). "H2S’ün elementel kükürde seçici oksidasyonunda Ti-V-Cr ve Ti-V-Fe katalizörleri". Uludağ Üniversitesi Mühendislik Fakültesi Dergisi, 23(2), 167-182.