RT journal article
T1 A facile one-pot hydrothermal synthesis as an efficient method to modulate the potassium content of cryptomelane and its effects on the redox and catalytic properties
A1 Pan, Huiyan
A1 Chen, Xiaowei
A1 Sanz, Oihane
A1 Cauqui López, Miguel Ángel
A1 Rodríguez-Izquierdo Gil, José María
A1 Delgado Jaén, Juan José
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Cryptomelane
K1 Pyrolusite
K1 Catalytic CO oxidation
K1 Hydrothermal synthesis
K1 Potassium content
AB Cryptomelane has been widely applied as catalyst in oxidation reactions due to its excellent redoxproperties and low cost. Here, a novel one-pot hydrothermal synthesis using a potassium permanganateaqueous solution as precursor and ethanol as reducing agent has successfully been developedto obtain cryptomelane nano-oxides. This synthetic route makes it possible to control the amount of potassium incorporated into the structure of the cryptomelane by selecting the appropriatesynthesis temperature and ethanol initial concentration. Taking advantage of this approach,the effect of potassium concentration on the structural stability and reducibility of the cryptomelane,which are poorly discussed in the literature, has been studied. We have observed that sampleswith low content of potassium (~11%) show high conversions of CO to CO2 especially at low temperatures. The lower activity of the samples with high K contents (~16%) can be ascribed to thebeneficial effect of K on the structural stability of cryptomelane in detriment of labile oxygen oncryptomelane surface.
PB Elsevier
SN 0253-9837
YR 2019
FD 2019-06
LK http://hdl.handle.net/10498/30002
UL http://hdl.handle.net/10498/30002
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026