Enhancing CO₂ Adsorption via Amine-Impregnated Activated Carbon from Oil Sands Coke

Abstract

In this work, amine-impregnated activated carbon was prepared from oil sands coke, for use in CO 2 capture. Delayed oil sands coke was activated using microwave heating and KOH as activation agent. The resulting material was then impregnated with one of diethanolamine, methyl diethanolamine, or tetraethylene pentamine. Analysis of the bulk and surface composition of the impregnated samples using elemental analysis and X-ray photoelectron spectroscopy suggested that the amines were deposited on the surface of the activated carbon. Materials impregnated with diethanolamine performed best for CO 2 capture; the highest adsorption capacity achieved was 5.63 mmol CO 2 /g adsorbent for activated carbon impregnated with 1.15 mmol N/g activated carbonnearly 75% higher than reported values for zeolite 13X. Adsorption of CO 2 on the amineimpregnated activated carbon at 40, 50, 60, and 75 °C showed that the highest adsorption capacity was obtained at 50 °C. Using oil sands delayed coke as a precursor for activated carbon transformed a petroleum waste material into an effective CO 2 adsorbent. Modifying the prepared activated carbon with amines improved CO 2 uptake capacity, creating a useful adsorbent for potential use in CO 2 capture.

Current Progress on the Surface Chemical Modification of Carbonaceous Materials

“…Materials impregnated with diethanolamine performed best for CO 2 capture; the highest adsorption capacity achieved was 5.63 mmol CO 2 /g. [172] Activated carbon…”

Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation

“…Among them, ACSs-N displayed the best performance, and its CO 2 capacity was 3.03 mmol g −1 at 25 • C and 1 bar, which is comparable to or higher than those of other state-of-the-art porous carbon adsorbents (see Table S1). It is well known that the favorable CO 2 capacity arose from two critical factors: (i) Highly microporous structure, especially the narrow micropores (<1 nm), which could greatly accommodate CO 2 molecules into pores; and (ii) heteroatom incorporation, especially N-doping, which could increase the surface basicity to enhance the bonding force with acidic CO 2 molecules [23,28,29,32]. However, the high micro-porosity is often inverse with the N content.…”

“…Among them, porous carbon absorbents have manifested many advantages, including easy preparation, low cost, large surface area, controllable porosity and surface functionality, hydrophobicity, and resistance to both bases and acids. One attractive aspect for porous carbon adsorbents is that they can be prepared by using various cheap carbon precursors, such as waste plastic polyethylene terephthalate [19], carbon black [24,25], coal [26][27][28], oil sands coke [29], and various biomass [30][31][32]. Among these precursors, biomass materials stand out for their environmental friendliness, wide availability, low cost, and renewability, and have been extensively used as a precursor for the preparation of gas-selective adsorbents.…”

Carbon nanoflake hybrid for biohydrogen CO 2 capture: Breakthrough adsorption test

“…[12][13][14][15][16][17][18][19] Despite the impregnation of amine-rich polymers into these solid CO 2 adsorbents, performance loss still occurs because of several factors, such as unwanted adsorption isotherm, sample degradation, and the lack of basicity for CO 2 interaction. [20][21][22] Chemical adsorption for CO 2 capture is also undesirable to avoid high enthalpy changes and interacting energy between the adsorbate and the adsorbent. Compared with chemical adsorption, physical adsorption only involves weak van der Waals force, which is advantageous for recycling.…”