Speciation of copper diffused in a bi-porous molecular sieve

C. H. Huang, H. Paul Wang, Y. L. Wei, J. E. Chang

研究成果: Article

摘要

To better understand diffusion of copper in the micro- and mesopores, speciation of copper in a bi-porous molecular sieve (BPMS) possessing inter-connecting 3-D micropores (0.50-0.55 nm) and 2-D mesopores (4.1 nm) has been studied by X-ray absorption near edge structure (XANES) spectroscopy. It is found that about 77% (16% of CuO nanoparticles and 61% of CuO clusters) and 23% (CuOads) of copper can be diffused into the meso- and micropores, respectively, in the BPMS. At least two diffusion steps in the BPMS may be involved: (i) free diffusion of copper in the mesopores and (ii) diffusion-controlled copper migrating into the micropores of the BPMS. The XANES data also indicate that diffusion rate of copper in the BPMS (4.68 × 10-5g/s) is greater than that in the ZSM-5 (1.11 xlO-6g/s) or MCM-41 (1.17xlO-5g/s).

指紋

Molecular sieves
absorbents
Copper
copper
X ray absorption near edge structure spectroscopy
data structures
X ray absorption
Multicarrier modulation
x rays
Nanoparticles
nanoparticles
spectroscopy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

引用此文

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title = "Speciation of copper diffused in a bi-porous molecular sieve",
abstract = "To better understand diffusion of copper in the micro- and mesopores, speciation of copper in a bi-porous molecular sieve (BPMS) possessing inter-connecting 3-D micropores (0.50-0.55 nm) and 2-D mesopores (4.1 nm) has been studied by X-ray absorption near edge structure (XANES) spectroscopy. It is found that about 77{\%} (16{\%} of CuO nanoparticles and 61{\%} of CuO clusters) and 23{\%} (CuOads) of copper can be diffused into the meso- and micropores, respectively, in the BPMS. At least two diffusion steps in the BPMS may be involved: (i) free diffusion of copper in the mesopores and (ii) diffusion-controlled copper migrating into the micropores of the BPMS. The XANES data also indicate that diffusion rate of copper in the BPMS (4.68 × 10-5g/s) is greater than that in the ZSM-5 (1.11 xlO-6g/s) or MCM-41 (1.17xlO-5g/s).",
author = "Huang, {C. H.} and Wang, {H. Paul} and Wei, {Y. L.} and Chang, {J. E.}",
year = "2010",
month = "7",
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TY - JOUR

T1 - Speciation of copper diffused in a bi-porous molecular sieve

AU - Huang, C. H.

AU - Wang, H. Paul

AU - Wei, Y. L.

AU - Chang, J. E.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - To better understand diffusion of copper in the micro- and mesopores, speciation of copper in a bi-porous molecular sieve (BPMS) possessing inter-connecting 3-D micropores (0.50-0.55 nm) and 2-D mesopores (4.1 nm) has been studied by X-ray absorption near edge structure (XANES) spectroscopy. It is found that about 77% (16% of CuO nanoparticles and 61% of CuO clusters) and 23% (CuOads) of copper can be diffused into the meso- and micropores, respectively, in the BPMS. At least two diffusion steps in the BPMS may be involved: (i) free diffusion of copper in the mesopores and (ii) diffusion-controlled copper migrating into the micropores of the BPMS. The XANES data also indicate that diffusion rate of copper in the BPMS (4.68 × 10-5g/s) is greater than that in the ZSM-5 (1.11 xlO-6g/s) or MCM-41 (1.17xlO-5g/s).

AB - To better understand diffusion of copper in the micro- and mesopores, speciation of copper in a bi-porous molecular sieve (BPMS) possessing inter-connecting 3-D micropores (0.50-0.55 nm) and 2-D mesopores (4.1 nm) has been studied by X-ray absorption near edge structure (XANES) spectroscopy. It is found that about 77% (16% of CuO nanoparticles and 61% of CuO clusters) and 23% (CuOads) of copper can be diffused into the meso- and micropores, respectively, in the BPMS. At least two diffusion steps in the BPMS may be involved: (i) free diffusion of copper in the mesopores and (ii) diffusion-controlled copper migrating into the micropores of the BPMS. The XANES data also indicate that diffusion rate of copper in the BPMS (4.68 × 10-5g/s) is greater than that in the ZSM-5 (1.11 xlO-6g/s) or MCM-41 (1.17xlO-5g/s).

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