Armazenamento de metano na forma adsorvida utilizando materiais porosos a base de carbono

Abstract

Due to the diverse technical issues inherent to the storage of methane, currently the most commonly used technologies are LNG (liquefied natural gas) and CNG (compressed natural gas), which waste high amounts of energy, cylinders and equipment with materials of high resistance, for security reasons, causing these technologies to present high costs.However, in the last years the technology of adsorption with porous materials (GNA) has been studied as an alternative to more established technologies, since it uses smaller amounts of energy and cylinders constructed with lighter and cheaper materials.Biogas and biomethane appear as an energetic source of support for the employment and development of GNA technology, as this source offers energy potential from renewable raw materials and mitigation of greenhouse gases.In this context, the present work has the objective of the synthesis of carbon-based porous materials, aiming the storage of methane at 35 bar.The production of carbonaceous adsorbent materials consisted of the synthesis of highly porous carbons, which were produced from sucrose precursor and pyrolysed silica template, which were subjected to carbonization under inert atmosphere with a heating ramp of 10 ° C min-1 to the temperature of 700 ° C, where it was maintained for 1 h, followed by silica leaching by washing with NaOH solution and hydrofluoric acid (HF).Aiming to evaluate the potential of the materials produced, a morphological-textural and chemical characterization of the same was carried out. In this way, the charcoal samples were characterized by N2 (BET), Helium gas pycnometry, scanning electron microscopy (SEM), Raman spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray spectrometry (EDS), dynamic light scattering (DLS), Fourier transform infrared (FT-IR) spectroscopy were used for the templatesample.The characterization indicated a high surface area (786.3 m2 g -1) with high pore volume (1.92 cm 3 g -1), with a high content of micropores (0.37 cm 3 g -1) and mesopores ( 1.55 cm³ g-1), and also with a mean pore diameter of 32 A. Analysis of DRX and Raman indicate the formation of semicrystalline material similar to graphene oxide.Methane adsorption tests were performed at a temperature of 25 ° C and up to a pressure of 35 bar, the tests achieved an increase in storage capacity by approximately 67.59 V V-1 compared to the empty cylinder 28, 89 V V-1. The desorption experiments showed 100% at 50 ° C at delivery times of less than 20 min.This work was carried out with the support of the Coordination of Improve