L. Yu. Dolgikh

Catalysis of steam reforming of ethanol by nanosized manganese ferrite for hydrogen production

We have studied the process of ethanol steam reforming on manganese ferrite MnFe2O4 with a spinel structure at 400-700°C. We show that the spinel crystal structure is preserved during catalysis. This process is characterized by nearly stoichiometric yield of hydrogen at 650-700°C and the absence of CO in the reaction products in the temperature range 400-650°C.

Effect of Alkali Metals on the Strength of Oxygen–Catalyst Bond in Co-Containing Perovskites

Modification of the perovskite SrCoO3 with alkali metal atoms has a considerable influence on the strength of the oxygen–catalyst bond and causes an increase in the weakly bonded oxygen in the modified samples. An approximate correlation has been established between the reactivity of the oxygen in the perovskite and its catalytic activity in the non-stationary condensation of methane to higher hydrocarbons.

Direct oxygen-free methane dehydrocondensation in the presence of pentasil-type metal-bearing zeolites

Studies have been made on how the nature of the metal affects the activity and selectivity of a catalyst of M/ZVM type (in which M is Fe, Co, Ni, Pt, Rh, Pd, Mo, W, Cu, Zn) during the dehydrocondensation of methane to higher hydrocarbons in the absence of gas-phase oxidizing agents.

Factors determining selectivity of ethylene conversion to butadiene over aluminosilicate catalyst

A study has been made of the influence of temperature, partial pressure of C2H4, and contact time on the selectivity of direct conversion of ethylene to butadiene over an aluminosilicate catalyst. A critical analysis has been made of the competing directions of C2H4 conversion, which determine the selectivity of C4H6 formation under conditions of a heterogeneous-homogeneous mechanism in carrying out the process.

Nanosize Effect in Heterogeneous Catalytic Processes Over Copper, Iron, and Zirconium Oxides

A summary is given of the results of studies of the catalytic properties of nanophase systems derived from copper, iron, and zirconium oxides in the ethanol steam reforming, the oxidation of carbon monoxide, the preferential oxidation of CO in the presence of excess hydrogen, the oxidation of benzyl alcohol, and the cracking of triglycerides. A relationship was found between the catalytic activity of copper, iron, and zirconium oxides and the size of their nanoparticles. The reasons for the nanophase effect in these processes were elucidated for a number of systems.

Dehydrocondensation of methane to higher hydrocarbons on bifunctional catalysts in the absence of oxidizing agents in the gas phase

A study was carried out on the effect of the chemical nature of MxLy on the activity and selectivity of bifunctional MxLy/zeolite catalysts, where MxLy are metal-like transition metal compounds, M is a metal atom (Co, Mo, or W), and L is a nonmetal atom (B or Si), in the dehydrocondensation of methane to give higher hydrocarbons in the absence of gas-phase oxidizing agents.

Kinetic peculiarities of the heterogeneous-homogeneous conversion of ethylene to butadiene

The influence of the surface of the quartz packing and degree of crystallinity of aluminosilicate crystals on the total conversion of C2H4 and selectivity in the conversion of ethylene to butadiene have been established. It was shown that the data agree with the hypotheses of a heterogeneous-homogeneous mechanism of the process.

Conversion of ethylene to butadiene and higher hydrocarbons in the absence of a catalyst

The conversion of ethylene to butadiene and higher hydrocarbons in the absence of a catalyst in the temperature range 973–1023 K, an ethylene partial pressure of 2–15 kPa and a flow rate of 30–150 cm3/min. The effect of the reactor free space on the overall conversion of ethylene and its selectivity has been studied. The probable steps in the formation of the principal products is discussed.

Single-stage catalytic conversion of ethylene to butadiene

It has been found that butadiene is formed in the process of ethylene conversion over an aluminosilicate catalyst. Data have been obtained on the total conversion of C2H4 and product selectivities in the temperature interval from 873 to 973 K. Probable chemical reactions are suggested for this process.

Kinetics and mechanism of isotopic exchange for methane on group 4 to 8 transition metal borides and silicides

The isotopic exchange between CH4 and D2 over the metal-like compounds MXLY (M is a transition metal and L is B or Si) has been studied at 973 K to discover how CH4 is activated under conditions corresponding to the oxidative condensation of methane. The principal exchange product is monodeuteromethane, CH3D. The dependence of the specific rate of exchange on the surface area of the catalyst has been established.