Search for: All records

Abstract Magnetic field‐assisted concentration swing adsorption (CSA) provides an electrification‐compatible alternative to conventional temperature swing adsorption (TSA) by enabling rapid heating/cooling and energy‐efficient regeneration under near‐isothermal conditions, thereby eliminating the need for sensible heat input. Here, Fe₃O₄nanoparticles were integrated with fibrous nanosilica (FNS) and polyethylenimine (PEI) to construct a magnetically responsive adsorbent for near‐isothermal CSA of CO₂. Benefiting from the radially fibrous pore structure of FNS, Fe₃O₄/FNS‐PEI70 exhibited fast adsorption kinetics (<2 min) and a high CO₂adsorption capacity (4.2 mmol/g) at 80°C. Magnetic induction enabled efficient adsorbent regeneration and acheived 92.6% CO₂desorption at the same temperature. Humidity significantly enhanced CO₂capture (10.6 mmol/g at RH = 80%) without affecting the CSA process, whereas SO₂caused irreversible deactivation and NO showed negligible adsorption. Under concentration swing conditions studied, a theoretical regeneration energy of 2.0 MJ/ kg_CO2was estimated for magnetic field‐assisted CSA process, which was significantly lower than that of TSA, highlighting its promise as an energy‐efficient and scalable pathway for electrified CO₂capture. 

A vehicular adsorbed natural gas (ANG) tank system operates as a mobile, dual gas storage/separation system to enable off-the-natural-gas-grid producers of biogas to use, ship, and process biogas for: (a) onboard delivery to engine of on-demand delivery of methane-rich fuel to an internal-combustion engine; (b) onboard separation of methane from carbon dioxide and extraction of unused fuel as carbon-dioxide-rich commodity, and (c) and large-scale, tractor-trailer shipping of biogas to a biogas upgrading plant and separation of methane from carbon dioxide during discharge at the plant. A mobile tank system on a vehicle comprises vessels filled with porous adsorbent and pressure valves; pressure regulators; pressure/temperature transducers at inlet, outlet, intermediate ports; and an onboard compressor/gas extraction pump. The tank discharging procedure for the separation of biogas into methane and carbon dioxide is such that the concentration of methane in discharged gas is at least 10% greater than in biogas.