Analysis of Sequential Adsorption-Oxidation of VOCs on Atomic Layer-Deposited PtNi/ZrO₂-SiO₂Dual-Function Materials

Author

Busuyi O. Adebayo
Han Yu
Ali A. Rownaghi, Missouri University of Science and TechnologyFollow
Xinhua Liang, Missouri University of Science and TechnologyFollow
Fateme Rezaei, Missouri University of Science and TechnologyFollow

Abstract

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 ppm_v-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 ppm_v) 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.

Recommended Citation

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

Department(s)

Chemical and Biochemical Engineering

Comments

The authors thank the National Science Foundation (NSF CBET-1802049) for financially supporting this project.

International Standard Serial Number (ISSN)

1520-5029; 0887-0624

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2022 American Chemical Society, All rights reserved.

Publication Date

07 Jul 2022