2.   1.
 Pore Size Distribution of Metal(Ag, Cu, Co)-containing Activated Carbon Fibers
   

(Ag, Cu, Co)    

 ^†

 

(2000

Pore Size Distribution of Metal(Ag, Cu, Co)-containing Activated Carbon Fibers

Sang Yong Eom, Tae Hyun Cho, Kyu Haeng Cho and Seung Kon Ryu^†

Department of Chemical Engineering, Chungnam National University (Received 22 May 2000; accepted 7 August 2000)



Ag, Cu
Co  1 wt%      ,     

. !" # !"$ % &' ( burn-off )*+ ,#- +# !"+ .   /0

1 23+4 Co5 Cu6 Ag( 78 /01 . .  9%# 93, 141, 175 kJ/mole: !"$ % &

;$ 2. 184 kJ/mole( <; . 1 wt%. !"$ =  . >?@ABC' !"$ % &'  


DE5%: FGHI Type I$ (+6, Co  # hysteresis JKL M' KNOPQ RS5 T U5# V. W $ X (I . Ag6 Cu  #  9%5 Y;Z[ \] ^_ 18-20 Å.

`a+ bc6 Co  # `aL X 30-40 Å d 200-300 Å. V+ bcef .

Abstract−1 wt% Ag, Cu and Co-containing Activated Carbon Fibers(ACFs) were prepared and the pore size distributions depending on the activation condition were investigated. The burn-offs of metal-containing carbon fibers(CFs) are higher than that of non metal-containing CFs, because the metal accelerates the activation of carbon. Cobalt is better accelerator than cop- per and silver. Activation energies of three metal-containing CFs were 93, 141 and 175 kJ/mole, respectively, which were lower than that, 184 kJ/mole, of non metal-containing ACF. The isotherms of 1 wt% metal-containing ACFs were typical Type-I such as non metal-containing ACF. However, Co-containing ACF has mesoporous pores with hysteresis loop and rising tag at high relative pressure. Ag and Cu-containing ACFs have the average pore size of 18-20 Å in spite of low activation energy, while Co-containing ACF has two mesoporous regions of 30-40 Å and 200-300 Å with micropores.

Key words: Pore Size Distribution, Metal, Activated Carbon Fiber, Activation

†E-mail: [email protected]

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Elementary

analysis(wt%) Atomic ratio (C/H)

Benzene insoluble (BI, wt%)

Quinoline insoluble (QI, wt%)

Softening point (^oC)

C H N

97.1 2.72 0.18 2.97 46.7 1.2 255

Fig. 1. Schematic diagram of experimental apparatus for CF activation.

1. Water 5. Mixer & Preheater

2. Peristaltic pump 6. Sample pot 3. Flow meter 7. Activation furnace 4. Steam generator 8. Absorber

Fig. 2. Burn-off of metal-containing CFs with respect to volume ratio of gas mixture at 900^oC for 30 min.

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800^oC, (b) 850^oC, and (c) 900^oC.

Fig. 4. Arrhenius plot of CF activation.

Table 2. Parameters of activation energy

Metal 1/Temp.(K) ln(dw/dt) Activation energy(kJ/mole)

Ref

9.32×10⁻⁴ 08.9×10⁻⁴ 8.52×10⁻⁴

1.31 2.29 3.08

184

Ag

9.32×10⁻⁴ 08.9×10⁻⁴ 8.52×10⁻⁴

1.61 2.41 3.30

175

Cu

9.32×10⁻⁴ 08.9×10⁻⁴ 8.52×10⁻⁴

2.08 2.71 3.44

141

Co

9.32×10⁻⁴ 08.9×10⁻⁴ 8.52×10⁻⁴

3.61 4.02 4.51

93

 38 5 2000 10

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< ¨ h w
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burn-off %9 CowC9 †‡ ( ã!, 'Qà  v Fig. 5. SEM photos of (a) reference CF, (b) reference ACF, (c) Cu-containing CF and (d) Cu-containing ACF.

Fig. 6. Adsorption isotherm of N₂ at 77 K for metal-containing ACFs activated at 900^oC.

Fig. 7. Specific surface areas of (a) Cu, (b) Co-containing ACFs with re- spect to burn-off.

Š& 600-840 m²/g %‡& V&u(.

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Fig. 109, 900^oC9 g ¨ h w
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X KL
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4.  

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<d‚
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<9 KL*¸U 2 ñò!} ¨¨
< 9ÓQ, 93, 141, 175 kJ/mole!º&, h U wQ Äv  , 184 kJ/mole

!º(.

(2) Ag, Cuw
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Vu,– !, h wC! 1 wt%¿Q, 012! õ kl%ºU ÿ}, Cow
 , Šµb 0.4 !9 hysteresis Ô

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(3) BJHÒ9  234, Ag, Cuw
 c Ø.»F

18-20 Å 012! klu,– X Cow
 , 01

2J w Ø.»F 30-40 ÅJ 200-300 Å j2! kl%,


U V6 h w9  j2
  g¸ ‘ ' , c]U ±‹u(.

 

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Fig. 8. Specific surface area of metal-containing ACFs activated at 900

oC with respect to burn-off.

Fig. 9. Average pore diameter of metal-containing ACFs activated at 900^oC with respect to burn-off.

Fig. 10. Pore size distribution of metal-containing ACFs activated at 900^oC.

 38 5 2000 10

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