The Adsorption of SO₂by Zeolites Synthesized from Fly Ash

Abstract

Zeolites X, Y, and Na-P1 (90 °C) and analcime and sodalite (150 °C) were synthesized from Class F fly ash using 3 M sodium hydroxide solutions and autogenous pressures. The partially zeolitized fly ashes were dried overnight in air at room temperature and then characterized using X-ray diffraction and SEM. On occasion, a few samples were dried to constant weight for an additional 8−10 min in a microwave oven to remove bound water as well. The dried samples were evaluated for their ability to adsorb sulfur dioxide (SO2) from a simulated stack gas containing ∼2000 ppm SO2. Determinations were made in real time using a UV/vis spectrophotometer followed by a total sulfur analysis of the “loaded” samples once testing was complete. Breakthrough curves indicate that the zeolites in the samples are able to remove all of the SO2 in the simulated flue gas (zero SO2 emission) for varying periods of time, and that the actual amount of SO2 removed by the zeolite depended on the type and degree of “dryness” of the zeolite or zeolite-like material present. For example, a 7 day 150 °C cured sample containing analcime and sodalite was able to adsorb 6−7 mg of SO2 per gram of sample regardless of the source of the fly ash, whereas a 90 °C cured sample containing X, Y, and Na-P1 was significantly less efficient.

Analysis of the influence of fusion synthesis parameters on the SO2sorption properties of zeolites produced out of fly ash

“…According to no detailed data in relation to the quantity of zeolite material present in the samples synthesized out of fly ash, the description of efficiency calculation methods and the use of different methodology of the sorption experiments performed in other works aimed at SO2 sorption analysis of the zeolites synthesized out of fly ash, it is difficult to perform comparative analysis of received values. In general it can be stated that the received in this work values are in the range specified by other authors or are higher [12][13][14].…”

Modifikasi Limbah Abu Layang menjadi Adsorben untuk Mengurangi Limbah Zat Warna pada Industri Tekstil

“…Hasil penelitian menunjukkan bahwa adsorben ZLM mempunyai kemampuan yang tinggi dalam mengurangi kadar gas SO2 dalam limbah gas sampai 100% atau zero SO2 emission [11].…”

Continuous Flow Synthesis of Zeolite-A from Coal Fly Ash Utilizing Microwave Irradiation with Recycled Liquid Stream

“…Due to these abilities they find many potential applications in the fields of pollution control (Moreno et al, 2001), radioactive waste management (Malekpour et al, 2008;Sinha et al, 1995), petrochemical reactions (Landau et al, 2003;Babajide et al, 2012), water purification (Savage and Diallo, 2005;Theron et al, 2010;Shoumkova, 2011;Fan et al, 2008), purification of gasses (Srinivasan and Grutzeck, 1999;Cheung and Hedin, 2014;Wdowin et al, 2014) and agriculture (Khan et al, 2013).…”