Details
| Original language | English |
|---|---|
| Pages (from-to) | 182-186 |
| Number of pages | 5 |
| Journal | Chemical Engineering and Technology |
| Volume | 28 |
| Issue number | 2 |
| Publication status | Published - 26 Jan 2005 |
Abstract
Oxide surfaces are covered with hydroxyl groups. In contact with water, positive or negative surface charges can be developed. The surface charge of oxide particles can be fine-tuned by changing the calcination temperature of the oxides before dispersion in water or by variation of the suspension pH. Strong negative or positive surface charges stabilize a suspension and avoid particle aggregation. Nano-structured catalysts suspended in water show surface charges different from those of compact TiO2. For spray drying, the cationic or anionic additives used have to be strongly attached via electrostatic forces to the surface of the suspended oxide particles. When noble metal complexes have to be brought to the support surface, the positively or negatively charged complexes must have an opposite charge relative to the surface charge. Zeta potential measurements can solve these problems.
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In: Chemical Engineering and Technology, Vol. 28, No. 2, 26.01.2005, p. 182-186.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Zeta potential measurement in catalyst preparations
AU - Stelzer, Jean Boris
AU - Nitzsche, Rolf
AU - Caro, Jürgen
PY - 2005/1/26
Y1 - 2005/1/26
N2 - Oxide surfaces are covered with hydroxyl groups. In contact with water, positive or negative surface charges can be developed. The surface charge of oxide particles can be fine-tuned by changing the calcination temperature of the oxides before dispersion in water or by variation of the suspension pH. Strong negative or positive surface charges stabilize a suspension and avoid particle aggregation. Nano-structured catalysts suspended in water show surface charges different from those of compact TiO2. For spray drying, the cationic or anionic additives used have to be strongly attached via electrostatic forces to the surface of the suspended oxide particles. When noble metal complexes have to be brought to the support surface, the positively or negatively charged complexes must have an opposite charge relative to the surface charge. Zeta potential measurements can solve these problems.
AB - Oxide surfaces are covered with hydroxyl groups. In contact with water, positive or negative surface charges can be developed. The surface charge of oxide particles can be fine-tuned by changing the calcination temperature of the oxides before dispersion in water or by variation of the suspension pH. Strong negative or positive surface charges stabilize a suspension and avoid particle aggregation. Nano-structured catalysts suspended in water show surface charges different from those of compact TiO2. For spray drying, the cationic or anionic additives used have to be strongly attached via electrostatic forces to the surface of the suspended oxide particles. When noble metal complexes have to be brought to the support surface, the positively or negatively charged complexes must have an opposite charge relative to the surface charge. Zeta potential measurements can solve these problems.
UR - http://www.scopus.com/inward/record.url?scp=14844334247&partnerID=8YFLogxK
U2 - 10.1002/ceat.200402123
DO - 10.1002/ceat.200402123
M3 - Article
AN - SCOPUS:14844334247
VL - 28
SP - 182
EP - 186
JO - Chemical Engineering and Technology
JF - Chemical Engineering and Technology
SN - 0930-7516
IS - 2
ER -