Poly Tertiary Amine Research Articles

Facilely tuning the morphologies of tertiary amine-functionalized SBA-15 for optimizing selective SO2 capture

The amine-based materials pose high potential for the adsorption of sulfur dioxide (SO2). This work is aimed at modulating the morphologies of SBA-15 adsorbents by controlling the precursor self-assembly processes, for the sake of optimizing the utilization efficiency of amine species in the polytertiary amine (PTA)-functionalized SBA-15. It results that worm-like SBA-15 (WLS) material shows a better particle aspect ratio and well-defined pore structure, which helps to optimize the adsorption sites invoked by the preferable dispersion and exposure of PTA, thus amplifying the chemisorption of SO2 on the adsorbent. Consequently, the functionalized WLS-PTA adsorbent exhibits remarkable SO2 adsorption performance (15.43 mmol/g), exceptionally high selectivities of SO2/N2 (27522) and SO2/CO2 (652). Surprisingly, the desulfurization capacity can be further enhanced by the positive effect of the water vapor co-fed. It is unveiled that the whole SO2 adsorption process mainly follows the dual site Langmuir-Freundlich isotherm model and Bangham model. This work sheds light on the design of polymer-solid composite adsorbents for selective capture of SO2.

Meso-macroporous polymer densely functionalized with tertiary amine groups as effective sorbents for SO2 capture

• A meso-macroporous polymer was synthesized by one-step solvothermal polymerization. • The polymer has abundant mesopores and macropores, as well as large pore volume. • A polytertiary amine was immobilized in the polymer to prepare composite sorbents. • The composite sorbents are dense in the functionalization of tertiary amine groups. • The composite sorbents exhibit excellent efficiency for the capture of SO 2 at low pressures. Developing new technologies for the reduction of SO 2 emission is highly demanded. In this work, a meso-macroporous polymer was synthesized by one-step solvothermal polymerization of divinylbenzene (DVB). The synthesized polymer-polydivinylbenzene (PDVB) also has considerably large pore volume. Given these features, a series of composite sorbents with a polytertiary amine (PTA) physically immobilized in PDVB were then synthesized, and subsequently characterized and investigated for the capture of SO 2 in details. The PTA loadings of composite sorbents range from 1.00 to 2.35 g/g, which are dense in the functionalization of tertiary amine groups that enable Lewis base-acid interaction with SO 2 . As a result, the composite sorbents exhibit excellent efficiency for SO 2 capture, especially at extremely low pressures. The SO 2 adsorption capacities of composite sorbents have the values of 3.86 ~ 6.88 mmol/g of SO 2 at 25 °C and 0.002 bar. The composite sorbents are also excellent for the selective separation of SO 2 from CO 2 and N 2 , as well as the excellent reversibility for the adsorption of SO 2 .