Application Of Porous Material Loaded Ionic Liquids In Absorption Of SO₂,NO₂,CO₂

This project aims to find an ionic liquid loading material absorbent that has a higher absorption capacity for acid gases such as SO₂.Three ionic liquid loading materials were prepared and their absorption properties for SO₂,NO₂ and other gases were studied.Three ionic liquids were prepared by one-step synthesis:acetamide-sodium thiocyanate,acetamide-potassium thiocyanate,acetamide-ammonium thiocyanate,and characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy.Three kinds of ionic liquid loading materials were prepared by equal mass ratio impregnation method:acetamide-sodium thiocyanate silica gel loading material,acetamide-potassium thiocyanate silica gel loading material,acetamide-ammonium thiocyanate silica gel loading material.The structure was characterized by Fourier transform infrared spectroscopy,scanning electron microscopy,thermogravimetric analysis and X-ray diffraction.The absorption effect of SO₂ on three ionic liquid loading materials at different temperatures?303.15-333.15 K,1 atm?and its recycling performance were determined.The results show that the acetamide-sodium thiocyanate ionic liquid at 80%loading has a higher SO₂ absorption(0.390 g·g^-1,303.15 K).The absorption effect of the acetamide-sodium thiocyanate loading material is almost unchanged after repeated use.The acetamide-sodium thiocyanate loading material is a physical adsorption process for SO₂ absorption.The CO₂ absorption effect of different proportions of ionic liquid loading materials and the absorption effect of ionic liquid loading materials on NO₂ at different temperatures and their recycling performance were measured.The results showed that the acetamide-sodium thiocyanate supported material has a high SO₂ absorption(0.144 g·g^-1,303.15 K)at 80%load ratio,and 80%loading ratio of acetamide-potassium thiocyanate ionic liquid has a high NO₂ absorption(0.230 g·g^-1,303.15 K).The absorption effect of acetamide-sodium thiocyanate loading material on CO₂ and NO₂ was almost unchanged after repeated recycling.