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Bu çalışma kapsamında farklı Mn/Si molar oranlarında, Mn katkılı MCM-41 katalizörleri sentezlenmiş ve katalizörlerin karakterizasyonu, XRD, BET, SEM, EDS ve parçacık boyut analizi metotları kullanılarak yapılmıştır. Katalizörlerin aktiviteleri, hidrojen peroksit katkılı yaş katalitik oksidasyon ile model atık sulardan fenol giderimi tepkimesinde test edilmiştir. XRD ve BET sonuçları, saf silikat formdaki MCM-41 destek malzemesinin istenilen altıgen gözenekli yapıda olduğunu, manganez metali eklendiğinde ise kristal yapının bozularak amorf yapıya dönüştüğünü, gözeneklerin kısmen bloke olması nedeniyle de BET yüzey alanlarının önemli ölçüde azaldığını göstermiştir. Fenol giderim reaksiyonları, laboratuar ortamında hazırlanan 50 ppm’lik fenol çözeltisi kullanılarak, 25,40 ve 60oC’de, 6,0 olarak ölçülen başlangıç pH’sında ve kesikli reaktörde yürütülmüştür. Deney sonuçları, optimum metal yüklemesinin Mn/Si molar oranı 0,06 olduğunda gerçekleştiğini göstermiştir. Reaksiyon bulguları incelendiğinde, sıcaklıkla birlikte fenol gideriminin arttığı görülmüştür. Buna ek olarak, atmosferik basınç ve çalışılan farklı sıcaklıklarda, katalizör yapısına metal eklenmesiyle birlikte fenol gideriminin, saf silika yapısındaki MCM-41’e oranla, Mn-MCM-41 katalizörleri için, %4.6-%14.4 aralığında arttığı görülmüştür. Optimum reaksiyon koşulları, atmosferik basınç, 60oC, 0,06 Mn/Si molar oranı olarak tespit edilmiş ve bu koşullarda %56 fenol giderimi elde edilmiştir. Ilımlı tepkime koşullarında (60oC ve atmosferik basınç), az miktarda metal ve az miktarda katalizör kullanarak (Mn/Si molar oranı 0,060, katalizör miktarı1,0 g/L), Mn-MCM-41 katalizörleri ile orta derece konsantre model atıksulardan optimum %56 fenol giderimi elde edilmesinin literatüre önemli bir katkı sağlayacağı düşünülmektedir.
In this study, in different Mn/Si molar ratio, Mn contributed MCM-41 catalysts were synthesized and catalysts were characterized using XRD, BET, SEM, EDS and particle size analysis methods. Activities of catalysts, hydrogen peroxide contributed age catalytic oxidation with model wastewater phenol discharge has been tested in response. The XRD and BET results showed that the MCM-41 support material in the pure silicate form is in the desired six-gent porous structure, while when manganese metal is added, the crystal structure is broken and transformed into amorphic structure, and the porous are partially blocked and the BET surface areas are significantly reduced. The phenol dissolving reactions are performed using the 50 ppm phenol solution prepared in the laboratory environment at 25,40 and 60oC, at the starting pH measured at 6,0 and in the cutting reactor. The results of the test showed that optimal metal charging occurs when the Mn/Si molar ratio is 0.06. When the reaction findings were studied, the phenol discharge was seen to increase with temperature. In addition, at atmospheric pressure and at different temperatures studied, the addition of metal to the catalyst structure, the phenol discharge was seen to increase in the range of 4.6-14.4% for Mn-MCM-41 catalysts, compared to MCM-41 in the pure silic structure. Optimum reaction conditions, atmospheric pressure, 60oC, 0,06 Mn/Si molar ratio were identified, and 56% phenol eradication was achieved in these conditions. It is believed that in temperate reaction conditions (60oC and atmospheric pressure), using a small amount of metal and a small amount of catalysts (Mn/Si molar ratio 0.060, catalyst ratio 1.0 g/L), Mn-MCM-41 catalysts and medium-centric model waste optimum 56% phenol discharge will make a significant contribution to literature.
In this study, Mn-incorporated MCM-41 catalysts with different Mn/Si molar ratios were synthesised and the characterisation of the catalysts was carried out by using XRD, BET, SEM, EDS and particle size analysis methods. The activities of the catalysts were tested in the phenol removal reaction from model solutions using the wet catalytic oxidation with hydrogen peroxide. XRD and BET results showed that the MCM-41 support material in the pure silicate form had the desired hexagonal porous structure but upon addition of the manganese metal, the crystal structure deteriorated becoming amorphous and the surface areas reduced significantly due to the partial blocking of the pores. Phenol removal reactions were carried out using a 50 ppm phenol solution prepared in the laboratory at 25,40 and 60oC, at an initial pH value of 6.0 in a batch reactor. The experimental results depicted that the optimum metal loading occurred at a Mn/Si molar ratio of 0.06. Investigation of the reaction results showed that phenol removal increased with temperature. In addition, at atmospheric pressure and at the studied different temperatures, with the addition of the metal to the MCM-41 structure, the phenol removal percentage increased in the range of 4.6%-14.4% for Mn-MCM-41 catalysts, compared to the purely siliceous MCM-41. Optimum reaction conditions were determined as 60oC, atmospheric pressure, 0.06 Mn/Si molar ratio, and 56% phenol removal was obtained under these conditions. Obtaining an optimum 56% phenol removal from moderately concentrated model waste waters with Mn-MCM-41 catalysts by using a small amount of metal and small amount of catalyst (Mn/Si molar ratio 0.060, catalyst amount 1.0 g/L) under moderate reaction conditions (60oC and atmospheric pressure), is thought to make an important contribution to the literature.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Uluslararası
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