phân tích eclectron trong hóa phân tích phần 8 pdf
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FiEm-e 12. Y~S spectTa of commercial ]~rchemie ~talyst in Fe 21) region. (~) fol]o~-mg ca]dnat]on
for 16 ~ a~ 3{10 ~C~ (b) follo~ e.~'posure ot" (~) ~o CO ~t 300 °G; (¢) follo~'mg e,l~o~e
of (a) to 112 at 300 °C.
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Figure 13. XPS spectra of commercial Ruhrc.hemie cazaly~ in Si 2p region. (a) foDowing calch~tion
for 16 ba-s at 300 =C; (b) following exposure of (a) to CO at 300 °C; (c) fonowi~ exposure
of (a) to }t_- at 300 °C.
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'Fi~.u'e I4.
XPS spectra of" con'~n~da.1 R",z~daemie cat ~lyst in If 2p ant1. C ls ~regions. (a} following
c~c~ation fo~ 16 h~s at 300 °C; (b) follo~i~g e~os~Jre of (a) to CO at $00 • C; (c)fo]]owh~g
e.~os'=e of (a) to ~ at 300 °C.
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Fi~uTe 15.
XPS spectra of commerded Ru]u'chemie catalys~ in O Is region. (a) following calcination
for 16 hrs a~ 300 ~C; (b) foUo~ring ~posare of (a) to CO at 300 °C; (c) followiag ~os~re
of (a) to ~I= at 300 °C.
Lsmiple De,,~,,t'~tion: ~
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ms.o Bin~g ~,,,gy Icy) ~.o
TE~S/~( I]~SITY
Figure 16. XPS spectra of comznerdal I~u]~chem~e catalyst in Cu 2p region. (a) foUowing calcination
for 16 ]~s at 300 oC; (b) fol]o~;~g exposure of (a) to CO at 300 oC; (c) following exposure
of (a) to
H2 a~ 300 °C.
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Time (rain)
Figure 17. Isothermal reduction pro~e in ~I~ for calcined {16 hrs in O~ at 300 °C) ~rnp|e of 2,5 wt
% Fe/Si02.
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0 200 4-00 600 800
Temperature (Oc)
Figure 18. TPR profile in H2 at 20 °C/miu for saznple of 25 wt % Fe/Si02 that had been pre~ously
txeazed for 15 bxs in H2 at 300 "C.
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Figx~e 19. XP5 spectra of 25 "~1% Fe/SiO2 in Fe 21) region following calci~adon fox 16 h~s a~ 300
°C and subsequent txeatment in H2 for 16 ]~'s at 300 °C.
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Wavenumber (cm "1)
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Fi~e 20. FT-m ~ec~ra ofNO a~orb~ a~ 25 °C on 25 ~-t % Fe/$iO~ ttmt
had
been r~cined for
16 ]lrs at 300 °C and subsequently z~-eatect in ]~z for 16 ]n~ at 300 °C. ~rh~ uppermost
spectrum was obtaiu~ followiug exposure of the sa~np]e to 10 tort of ~qO for 15 rain,
foUowed by e~cuation. T/~e second spectrum was obtained immediately a~te~ admission
of 10 torz of 02
at
25 °C. The ~'ema~g spectra ~'ere then obtained at 15 in~u intervals
in the ¢ontinuiug presence of gaseous Oz.
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2500 2000 1800 1600
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Figure
21. FT-IR spec~m of NO a~orbed at 25 °C on 25 ~ % Fe/SiOz containing 1 ~t % K that
had been calcined for 16 ]~'s st 300 °C and subsequently treated in H2 for 16 hrs at 300
°C. The uppermost spectrum was obt.zined following exposure of the sample to 10 ~r of
NO for 15 m~ followed by e~cua~on. The second spectrum was obtalned immediately
after admission of 10 tort of 02 at 25 °C. The r~ spectra weTe then obr.~ined az
15 mJn intervals in the continuing presence of gaseous 02.
