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Vanadium As a Potential Membrane Material for Carbon Capture: Effects of Minor Flue Gas Species

Journal Article · · Environmental Science and Technology
 [1];  [2];  [3];  [4];  [4];  [2]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Colorado School of Mines, Golden, CO (United States)
  3. Stanford Univ., Stanford, CA (United States); Applied Materials, Sunnyvale, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
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Vanadium and its surface oxides were studied as a potential nitrogen-selective membrane material for indirect carbon capture from coal or natural gas power plants. The effects of minor flue gas components (SO2, NO, NO2, H2O, and O2) on vanadium at 500–600 °C were investigated by thermochemical exposure in combination with X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and in situ X-ray diffraction (XRD). The results showed that SO2, NO, and NO2 are unlikely to have adsorbed on the surface vanadium oxides at 600 °C after exposure for up to 10 h, although NO and NO2 may have exhibited oxidizing effects (e.g., exposure to 250 ppmv NO/N2 resulted in an 2.4 times increase in surface V2O5 compared to exposure to just N2). We hypothesize that decomposition of surface vanadium oxides and diffusion of surface oxygen into the metal bulk are both important mechanisms affecting the composition and morphology of the vanadium membrane. Additionally, the results and hypothesis suggest that the carbon capture performance of the vanadium membrane can potentially be strengthened by material and process improvements such as alloying, operating temperature reduction, and flue gas treatment.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1457535
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 19 Vol. 51; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES