phân tích eclectron trong hóa phân tích phần 8 pdf

XPS spectra of commercial Ruhrc.hemie cazaly~ in Si 2p region... XPS spectra of commerded Ru]u'chemie catalys~ in O Is region... XPS spectra of comznerdal I~u]~chem~e catalyst in Cu 2p r

(c)

mHH~-E~

i, J , , ,

D

\

\

| •

u

I

i

L o

FiEm-e 12 Y~S spectTa of commercial ] ~ r c h e m i e ~talyst in Fe 21) region (~) fol]o~-mg ca]dnat]on

of (a) to 112 at 300 °C

~ l e llescrip~imc

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) f o n o w i ~ exposure

of (a) to }t_- at 300 °C

67

l- i j j

(0)

t

/

'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 ~ a t i o n 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

. / \

i

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 ~ o s ~ r e

of (a) to ~I= at 300 °C

Lsmiple De,,~,,t'~tion: ~

TE~S/~( I ] ~ S I T Y

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

7o

cn

m m

r -

13

L=

o J

Q

s,

V

q~

i'-

0

fn

a

o

i

Time (rain)

Figure 17 Isothermal reduction p r o ~ e in ~I~ for calcined {16 hrs in O~ at 300 °C) ~rnp|e of 2,5 wt

% Fe/Si02

71

tJ~

e , m m m D

c-

b

1:I

Q

t:1

m

c

0

CL

(jr}

Q,)

rv-

C~

F -

l I v I , T , , 1 , I l l , I , !

Temperature (Oc)

Figure 18 T P R 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

?2

580B

Reg i on

S

• ':.;;::-:~ j - t - -

74e.8

%

;.-:;:/' -

I I

7 1 ~ 0

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

A

o

f• t

n

±~ - ~

I

!

I " m

o m m

!

_L

, -.~ .-~

~ = - ~ _ ~ ~

I

m

!

!

t !

"!

• " l-: : - " p ~ I m

2 5 0 0 2 0 0 0 1800 1 6 0 0

Wavenumber (cm " 1 )

1300

16 ]lrs at 300 °C and subsequently z~-eatect in ]~z for 16 ]n~ at 300 °C ~rh~ uppermost

spectrum was o b t a i u ~ 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

in the ¢ontinuiug presence of gaseous Oz

" * ' t ¸ "

11

~ ° -

, ~

c _

- ]_m_=

. ' =F .':'

~

i

, o

p

, °

m

o

, ° ,

" i

" - - - ' T - - T " t

i

m

1300

Figure 21 FT-IR spec~m o f NO a ~ o r b e d at 25 °C on 25 ~ % Fe/SiOz containing 1 ~ t % K that

had been calcined for 16 ]~'s s t 300 °C and subsequently treated in H2 for 16 hrs at 300

°C The uppermost spectrum was obt.zined following exposure of the sample t o 10 ~ r of

NO for 15 m ~ followed by e ~ c u a ~ o n T h e second spectrum was obtalned immediately

15 mJn intervals in the continuing presence o f gaseous 02