Zeta potential measurement in catalyst preparations

2019-09-11 05:36:24

potential charge surface charges zeta

责任者: Stelzer, Jean Boris;Nitzsche, Rolf;Caro, Jurgen 单位: Inst. for Phys. Chem./Electrochem., University of Hanover, D-30167 Hanover, Germany 来源出处: Chemical Engineering and Technology,2005,28(2):182-186 摘要: 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. © 2005 WILEY-VCH GmbH and Co. KGaA, Weinheim. 关键词: Catalysts;Interfaces (materials);Nanostructured materials;Hydroxylation;Calcination;Water;Dispersions;pH effects;Titanium oxides;Electrostatics;Drying;Negative ions;Positive ions;Surface treatment;Problem solving;Zeta potential measurements;Oxide surfaces;Nanostructured catalysts;Electrostatic forces