Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

Abstract

Implementing Paris Climate Accord is inhibited by the high energy consumption of the state-of-the-art CO2 capture technologies due to the notoriously slow kinetics in CO2 desorption step of CO2 capture. To address the challenge, here we report that nanostructured TiO(OH)2 as a catalyst is capable of drastically increasing the rates of CO2 desorption from spent monoethanolamine (MEA) by over 4500%. This discovery makes CO2 capture successful at much lower temperatures, which not only dramatically reduces energy consumption but also amine losses and prevents emission of carcinogenic amine-decomposition byproducts. The catalytic effect of TiO(OH)2 is observed with Raman characterization. The stabilities of the catalyst and MEA are confirmed with 50 cyclic CO2 sorption and sorption. A possible mechanism is proposed for the TiO(OH)2-catalyzed CO2 capture. TiO(OH)2 could be a key to the future success of Paris Climat e Accord.

Use of nanoparticles Cu/TiO(OH)2 for CO2 removal with K2CO3/KHCO3 based solution: enhanced thermal conductivity and reaction kinetics enhancing the CO2 sorption/desorption performance of K2CO3/KHCO3

“…The enhancement caused by the addition of TiO(OH) 2 is clearly understood by the formation of TiO(OH) + and OH − , which can enhance the CO 2 sorption/desorption kinetics . The improvement of the CO 2 sorption/desorption of the solution caused by the addition of Cu is also due to the enhancement of the heat transfer.…”

“…Besides enhancing the heat/mass transfer, CO 2 sorption/desorption kinetics should also be enhanced because the CO 2 sorption/desorption performance of alkali‐based sorbent (inorganic sorbent) is worse than that of amine‐based sorbent (organic sorbent) . Many scholars have suggested that loading 1∼10wt% of TiO 2 , TiO(OH) 2 and ZrO 2 additive on alkali‐based sorbent could enhance the reaction kinetics due to the formation of OH − or the transition state rich in hydroxyl groups on the surface could accelerate the CO 2 sorption/desorption reaction . It has been reported that supporting NaHCO 3 on TiO(OH) 2 reduced the activation energy of NaHCO 3 dramatically from 75 to 36 kJ/mol and the formation of TiO(OH) + and OH − can increase the CO 2 desorption reaction rate …”

Study of Catalytic CO2 Absorption and Desorption with Tertiary Amine DEEA and 1DMA-2P with the Aid of Solid Acid and Solid Alkaline Chemicals

“…However, the effects of both solid bases onto a tertiary amine have rarely been discussed either. The effects of solid acid catalysts (γ-Al 2 O 3 , H-ZSM-5, TiO(OH) 2 , and transition metal oxides V 2 O 5 , MoO 3 , WO 3 , TiO 2 , and Cr 2 O 3 ) to MEA [9,21,22,23,24,25] and DEA [26] have also been studied and proven to be effective in the reduction of heat duty. Some studies have been completed to investigate the effects of solid acid catalysts (H-ZSM-5, MCM-41 and SO 4 2− /ZrO 2 ) with blended amine solvents of 5 + 1.0 mol/L MEA-DEEA and MEA-1DMA-2P [9].…”

CO2 Decomposition in CO2 and CO2/H2 Spark‐like Plasma Discharges at Atmospheric Pressure

“…[24,30] Estimates of the current energy costs for CO 2 separation, ar elatively maturet echnology,o ffer an order of magnitude estimate for future energy costs in the separation of CO and O 2 . [24] Studying the co-reaction of H 2 (which can potentially be generated from inexpensive and renewable electricity sources [10] ) with CO 2 (captured from fossil fuelc ombustion [11] )i nt he context of an atmosphericp ressure plasma [5] is therefore particularly prescientt oc urrente fforts to abate climate change and is therefore ac entral motivation for this report. [5,9,24] This estimate includes CO formation;t herefore, any dilution with ac o-reactant resulting in O 2 removal would be af raction of this energy range.…”