Analysis of Sequential Adsorption-Oxidation of VOCs on Atomic Layer-Deposited PtNi/ZrO₂-SiO₂Dual-Function Materials
To develop efficient dual-function materials (DFMs) for capture and destruction of volatile organic compounds (VOCs), we prepared a series of composite materials comprising PtNi nanoparticles supported on ZrO2-promoted SiO2(PtNi/ZrO2-SiO2) via atomic layer deposition (ALD) method and investigated them for sequential adsorption and desorption/catalytic oxidation of benzene, as a model VOC compound. ZrO2was first deposited on a unimodal SiO2v support, followed by deposition of Pt and Ni nanoparticles with varried amount. Dynamic adsorption experiments were conducted using a 500 ppmv-laden feed at 25 °C and 1 atm, followed by in situ catalytic oxidation at 200 °C. Among the DFMs investigated, 1Pt2Ni/ZrSi emerged as the material with overall in situ conversion of ∼96% due to its retaively high PtNi acid sites density compared with other DFMs. Kinetic analysis was conducted on 1Pt2Ni/ZrSi by investigating the effects of feed concentration, regenerative feed flow rate, and oxidation temperature on the benzene conversion in the sequential adsorption-oxidation process. The results of the kinetic analysis revealed that a complete oxidation can be attained over 1Pt2Ni/ZrSi and its performance can be improved upon decreasing adsorptive feed benzene concentration (maximum value of 99.7% at 125 ppmv) and regenerative feed flow rate (100% at 5 mL/min), and increasing oxidation temperature (100% at 200 °C). Overall, the obtained results highlighted the optimal operation conditions for sequential adsorption and oxidation of VOCs over ALD-based DFMs.
B. O. Adebayo et al., "Analysis of Sequential Adsorption-Oxidation of VOCs on Atomic Layer-Deposited PtNi/ZrO₂-SiO₂Dual-Function Materials," Energy and Fuels, vol. 36, no. 13, pp. 6989 - 6998, American Chemical Society, Jul 2022.
The definitive version is available at https://doi.org/10.1021/acs.energyfuels.2c01013
Chemical and Biochemical Engineering
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07 Jul 2022
The authors thank the National Science Foundation (NSF CBET-1802049) for financially supporting this project.