A green synthesis of PEI@nano-SiO₂ adsorbent from coal fly ash: selective and efficient CO₂ adsorption from biogas

Abstract

As an alternative renewable energy, upgraded biogas by separating CH4 and CO2 can be used to replace natural gas in automobiles and power grids.

Adsorption of CO2 in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

“…The solid amine adsorbents were synthesized by the wet impregnation method. The specific steps are as follows . First, a certain mass of PEI was added to 20 mL of methanol and stirred for 30 min.…”

“…The specific steps are as follows. 37 First, a certain mass of PEI was added to 20 mL of methanol and stirred for 30 min. Then, 1 g of the support was added to the above solution, the mixture was continuously stirred until it was in a slurry state, and it was transferred to a 65 °C vacuum drying oven to dry overnight.…”

Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

“…18 Although amine-functionalized adsorbents have excellent cycling stability in an inert regeneration atmosphere, only the adsorbents are regenerated in a CO 2 -enriched atmosphere (practical regeneration atmosphere) via temperature swing adsorption (TSA), yielding high-purity CO 2 for subsequent storage and utilization. 19 Nevertheless, amine-functionalized adsorbents are easily deactivated by urea formation when the regeneration temperature exceeds 130 °C in a CO 2 regeneration atmosphere, 20 resulting in the loss of more than 80% of the CO 2 uptake in 10 cycles. 21 Therefore, extensive efforts are required to develop advanced amine-functionalized adsorbents with multiple advantages, such as economical preparation, high CO 2 uptake, stable cycling performance, and scale-up production.…”

Carbon Dioxide Adsorption Performance and the Kinetic Properties of the Zirconium and Poly(ethyleneimine) Bifunctionalized Molecular Sieve of KIT-6

“…In this field, CO 2 absorption and CO 2 adsorption are the main techniques. However, CO 2 absorption is limited on account of the strong corrosion and high energy consumption. − Nowadays, CO 2 adsorption is becoming a promising method on the basis of the large adsorption capacity and low corrosion. − Moreover, a great number of adsorbents, such as lithium salts, , metal oxides, ,− silica-based molecular sieves, − carbon materials, − bimetallic materials, metal–organic framework (MOF) materials, − polymers, , and ionic liquids, , are designed for efficient CO 2 adsorption. Among them, N-based porous materials are good candidates based on the excellent pore structure and the considerable content of amine groups. − …”