Jamil Toyir

Abstract New lacunary Keggin type polyoxometalate salts (Ni 2.5 PMo 11 M (H 2 O)O 39 / M = Co, Fe, Cu, Zn), were synthesized using the inorganic condensation method. X-ray diffraction and infrared spectroscopy results showed that the Keggin structure of the salts was preserved. The thermal stability was checked by differential scanning calorimetry coupled with thermogravimetric analysis showing that the thermal resistance was significantly improved by the incorporation of the metals into polyoxometalates. Proton and molybdenum substitution respectively by nickel and cobalt, iron, copper and zinc metals induced a positive effect on the crystallographic configuration of the prepared salts allowing them a better thermal resistance (up to 580 °C). Cyclic voltammetry revealed an interesting electrochemical property of synthesized samples, especially for Ni 2.5 PMo 11 Zn(H 2 O)O 39 sample in which the presence of zinc greatly boosted the redox behavior.

Polyoxometalate

Thermogravimetric analysis

Thermal Stability

Lacunary function

10.1515/ijmr-2021-8294

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Citations (2)

NH3-Selective Catalytic Reduction of NOx to N2 over Ceria Supported WOx Based Catalysts: Influence of Tungsten Content

Catalysts (2021)

Imane El Arrouji Cuirong Chen Jamil Toyir Cherif Larabi Kai C. Szeto

A series of HPW/CeO2 catalysts generated from 12-tungstophosphoric acid, H3PW12O40 (HPW), supported on ceria and presenting different tungsten loadings (2, 4.5, 9, 16, and 40 wt% W) were prepared and characterized by N2 physisorption, XRD, IR, Raman, and UV-Vis. The different characterization techniques suggested that low loading of tungsten resulted in mainly isolated sites, while high tungsten loading produced polymeric or tungsten clusters. Those materials exhibited high activity in NH3-SCR of NOx into N2. Moreover, the series of experiments indicated that low loading in tungsten (2% HPW/CeO2) displayed the highest activity with a remarkable N2 selectivity (99%) at medium-high temperature (300–515 °C), owing to the high amount of monomeric tungstate coverage on the catalyst surface.

Physisorption

Tungstate

Selective catalytic reduction

10.3390/catal11080950

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Citations (7)

Catalytic Processes for Activation of CO2

Elsevier eBooks (2013)

Narcı́s Homs Jamil Toyir Pilar Ramı́rez de la Piscina

10.1016/b978-0-444-53882-6.00001-2

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Citations (19)