Oxidation of isobutene over cuprous oxide between 400 and 550°C

Measurements were made of the solubility of sodium formate at 21, 60, and 120 °C In aqueous solutions of sodium hydroxide. The concentratlon of sodium hydroxide ranges from 0 to 40% w/w. The results are combined wlth data of binary systems to give a semiquantltatlve description of the total phase diagram HCOONa-NaOH-H2O

Carbon dioxide reaction with methane on La2O3 supported Rh catalysts

Three Rh supported catalysts (Rh/SiO2, Rh/La2O3-SiO2, Rh/La2O3) have been investigated by catalytic tests in the dry reforming reaction (CO2+CH4--> 2CO+2H(2)). The La2O3 shows a positive effect on the conversion and selectivity due to the CO2 activation. The results lead to the supposition of a deep influence of the CH4 partial pressure on the CO2 conversion. The mechanism should involve the reaction of carbon dioxide on the support with methane adsorbed on the metal. Thermogravimetric analyses put in evidence the role of metal and seem to confirm a concerted reaction scheme in which carbon deposition and CO2 conversion simultaneously occurr

Isothermal Reduction Behaviour of Undoped and Ca, K and P-Doped NiMoO4 Phases Used for Selective Propane Oxydehydrogenation

Isothermal reduction under hydrogen of polymorphic NiMoO4 system has been studied at different temperatures using thermogravimetry. Evidences found by TG (oxygen depletion rate) have shown a dependence on lattice oxygen mobility and source due to the crystal structure and temperature. Relative to the undoped NiMoO4 phases, it has been found that the presence of K2O, CaO and P2O5 promoters simultaneously affects both the reduction rate and the oxygen source. Monolayer lattice oxygen mobility of undoped and doped NiMoO4 material was investigated by oxydehydrogenation of light alkanes performed by using a periodic flow micro-reactor. The alkane activity has been found to be linked to the reduction behaviour of the different undoped and doped NiMoO4 phases

On the NiO, MoO₃ mixed oxide correlation between preparative procedures thermal activation and catalytic properties

International audienceIn order to achieve a better control of the final characteristics of nickel molybdate catalysts employed in the oxidative dehydrogenation of propane, a study of the dependence of the catalytic activity upon the preparation methods has been undertaken. A new oxalic precursor is compared to those precipitated from an ammonia solution and is particularly studied because it leads to more selective phase β stabilized at room temperature