Experimental and Modelling Investigation of CO2 Adsorption on Silicalite-1

Abstract

CO2 is present as an impurity in natural gas, flue gas, syngas, biogas and several other gas streams emitting from industrial processes. To improve the quality of natural gas, syngas, biogas, and to mitigate the greenhouse effect of CO2 on the environment, the removal of CO2 from such gas streams is of paramount importance. Crystalline microporous materials are promising for the adsorption of CO2 owing to their high surface area and tuneable pore size. So it has its uses in many fields in chemical industry, For example, gas separation, petrochemical refining, and catalytic cracking all employ the highly porous zeolite material known as silicalite-1 as an adsorbent or catalyst. The collection and storage of carbon dioxide (CO2), a greenhouse gas that significantly contributes to global climate change, is one possible use for silicalite-1. A key tactic for lowering greenhouse gas emissions and limiting the consequences of climate change is CO2 collection and storage. In this work we prepared silicalite-1 material and it is modified by the amine impregnation method. Advance characterization techniques XRD, SEM, BET, FTIR and TGA are used to examine the silicalite-1 and its successful amine modification. The experimental effort comprised measuring the CO2 absorption on silicalite-1 using a high-pressure adsorption Analyzer. The device comprises of a silicalite-1-filled stainless steel cylinder that is connected to a pressure transducer and a gas supply. CO2 is introduced into the cylinder using the gas supply at a specified pressure and temperature. Prior to and following the addition of CO2, the pressure within the cylinder is measured by the pressure transducer, from which the amount of CO2 absorbed by silicalite-1 can be estimated. The trials were conducted at various pressures (0–15 bar) and temperatures (100°C). The quantity of CO2 adsorbed as a function of pressure was used to depict the adsorption isotherms. According to the experimental findings, temperature and pressure have a significant impact on the rate of CO2 adsorption on silicalite-1. It was discovered that silicalite-1's CO2 adsorption capability increased with pressure and decreased with temperature. The adsorption isotherm parameters were used to model the breakthrough curves of the CO2 adsorption. The xi breakthrough curves also suggest a decrease in the CO2 uptake (mmol/g) of the aminated silicalite-1 zeolite.