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2.ExperimentaldetailsTheowcellexperimentalset-upisdescribedin[2].Graphitegrainswithad... 2. Experimental details
The ow cell experimental set-up is described in [2].
Graphite grains with a diameter of 1±2 mm were kindly
supplied by ElectroCell AB, Taby, Sweden. The packed
bed had a thickness of 6.5 mm, a projected area of
21 cm2 and a porosity of around 50%. A at nickel
electrode at the rear of the bed was used as current
collector. Its active contribution to the current density
was considered insignicant at the potentials used. This
assumption was based on an estimation of the eective
conductivity of the electrolyte phase of the bed and
results from kinetic investigations on nickel rotating disc
electrodes [3]. The reference capillary was introduced
from the back, through a hole in the current collector, so that its tip was positioned in the same plane as the front
of the bed, that is, towards the membrane. The potential
was measured against a Hg/HgO (3 M NaOH) reference
electrode. The anode and cathode chambers were
separated by a Naon 324 cation-exchange membrane.
The cathode was made of stainless steel.
Details of the electrolyte preparation have been
described previously [1, 2]. The initial anolyte compo-
sition was 0.595 M Na2 S, 0.105 M S0 , 3 M NaOH and
0.25 M Na2 CO3 , which simulates a partially oxidized
white liquor with 15% conversion of SII to S0 . A 2 M
NaOH solution was used as the starting catholyte. The
experiments were run at 90 C, although all concentra-
tions are those relevant at room temperature. The
anolyte ow rate was measured with a rotameter, which
gave a velocity of the electrolyte in the packed bed of
around 0.2 m s1 , taking the porosity into account.
Galvanostatic experiments were run using an Oltronix
B32-20R power supply. Slow scan polarization curves
were recorded using a Wenking HP 72 high power
potentiostat and a Wenking VSG 83 voltage scan
generator. Data were collected using BBC Goerz Met-
rawatt x±t and x±y recorders, and the amount of charge
was measured by a Unisystem U1010B Ah-meter.
Spectrophotometric in-line monitoring of sulde sul-
fur (SII ) and polysulde excess sulfur (S0 ), was done
using a Zeiss MSC 320 spectrometer equipped with an
attenuated total reectance (ATR) probe for u.v.
measurements. This analysis method is described in
[7, 8]. The ATR probe was placed directly into the
anolyte vessel, and calibration was made using the
starting anolyte as reference sample.
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该怎么细胞实验装置中所描述[ 2 ] 。
石墨颗粒直径1 ± 2毫米的善意
所提供的ElectroCell AB公司, Taby ,瑞典。填料
床上有一个厚度为6.5毫米,投影面积
二十一平方厘米和孔隙率50 %左右。阿在镍
电极在后面的床作为当前
收藏家。它的积极贡献的电流密度
被视为insignicant使用的潜力。这个
假设是根据估计eective
电导率的电解质阶段床和
从调查结果动力学镍旋转圆盘
电极[ 3 ] 。毛细管参考介绍
从后面,通过了一个洞在目前的收藏家,所以,它的秘诀是定位于同一平面的前面
床,就是对膜。潜力
测定对汞/ HgO ( 3米氢氧化钠)参考
电极。阳极和阴极室
隔开, Naon 324阳离子交换膜。
阴极是由不锈钢制成的。
详情电解质筹备已
前面介绍[ 1 , 2 ] 。最初的阳极复合
位置是0.595 M Na2硫, 0.105 M S0 , 300 NaOH和
0.25 M Na2碳酸,其中模拟部分氧化
白酒的15 %转化为S0精工。甲2男
NaOH溶液作为出发阴极。那个
实验运行90 ć ,虽然所有浓度
筹措是有关在室温下。那个
阳极低利率是衡量一个浮子,这
了速度电解质中的填料床的
围绕0.2米一,要考虑的孔隙度到。
电流试验运行使用Oltronix
B32 - 20R电源。慢扫描极化曲线
录使用Wenking惠普72高功率
恒电位和Wenking VSG 83电压扫描
发电机。收集资料,利用英国广播公司Goerz蛋氨酸
rawatt均数± t和x ± Ÿ录音机,和数额的费用
是衡量一个Unisystem U1010B啊米。
光度法在线监测sulde硫酸
毛皮( SII )时和polysulde超过硫( S0 ) ,做
使用蔡司海安320配备了光谱仪
减毒总reectance (全反射)紫外探测器
测量。这种分析方法中所描述
[ 7 , 8 ] 。探针的全反射直接进入
阳极船只和校准有人使用
开始阳极作为参考样本。
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