L. S. Glebov

Carbon number distribution and the chain-growth mechanism of products in the modified Fischer-Tropsch synthesis on a reduced promoted fused magnetite catalyst

The investigation of carbon number distribution of FT synthesis products through the use of the well-known Schulz-Flory equations in the chemistry of polymers is the subject of numerous publications and is of interest in the study of the carbon chain-growth mechanism and the formation of synthesis products. To the authors, modified Fischer-Tropsch syntheses (CO + H/sub 2/ + substrate containing NH/sub 2/, OH, CHO, C=C, C similarly ordered C, and other groups) on iron catalysts are of particular interest in such studies. The present work is dedicated to the study of carbon number distribution of a real polyfunctional product of ammonia-modified FT synthesis. It discusses the mechanism of formation of alkylamines in this synthesis and of the chain-growth process. 10 references.

Effective gas-phase deoxygenation of alcohols and ketones on iron catalyst

Abstract A method of gas-phase deoxygenation of alcohols and ketones into hydrocarbons on iron catalyst at 600 K and 1–2·105 Pa is discussed.

Mechanism of gas-phase hydrogenation of alicyclic ketones on iron catalyst: effective experimental method on the basis of reaction gas chromatography/mass spectrometry

Abstract The mechanism of gas-phase deuterium addition to cyclopentanone and cyclohexanone over fused iron catalyst has been studied by reaction gas chromatography/mass spectrometry ( GC MS ) which involves the on-line deuteriogenation and on-column silylation of reaction products. It has been found that in the temperature range of 50–210 °C cyclanone hydrogenation proceeds both via ketonic and enolic mechanisms. Also, it has been shown that the method developed can be used for the determination of enolic forms of carbonyl compounds in the gas phase.

Cyclization of diols with ammonia over CuO-ZnO-Al2O3 catalyst in the presence of H2

Cyclization of diols with ammonia in an H2 atmosphere over an industrial CuO-ZnO-Al2O3 catalyst for the synthesis of methanol (SNM-1) gives nitrogen-containing five-, six-, or seven-membered heterocyclic compounds. The yields of cyclic amines in the 180–230 °C temperature range are 46 to 97 %.

Reductive Dimerization and Oligomerization of Alcohols, Ketones, and Aldehydes to Hydrocarbons on a Promoted, Fused Iron Catalyst

A new reductive dimerization and oligomerization reaction of (C5 and C6) cycloalkanols and cycloalkanones, benzaldehyde, and benzyl alcohol to hydrocarbons containing as many, or more, carbon atoms as the reactant oxygenated compound on a promoted, fused iron catalyst proceeds at a temperature of 250–350°C, a hydrogen pressure of 0.1–1 MPa, a specific feed rate of oxygenated reagent of 80–320 g h−1kg−1Ct, and a hydrogen space velocity of 1 × 103 to 20 × 103 h−1. Possible reaction mechanisms have been considered.

Heterogeneous catalytic transformation of isobutyl benzoate by the inverse Tishchenko reaction

Using the catalytic transformation of isobutyl benzoate at 663 K in the presence of 12 % MnO2/γ-Al2O3 in a He atmosphere as an example, it has been shown that the inverse Tishchenko reaction can take place at a temperature above 600 K. Isobutyl benzoate gives isobutanal and benzaldehyde as well as products of their transformation,i.e., benzyl isobutyrate, isobutanol, benzyl alcohol, and toluene.

Hydroamination of aliphatic alcohols under fischer-tropsch synthesis conditions on a fused iron catalyst

ConclusionsAliphatic alcohols are not aminated under Fischer-Tropsch synthesis conditions modified by amines or ammonia on an iron catalyst. Alkylamines are probably formed by the hydroamination of surface species.

Synthesis of asymmetric secondary and tertiary amines from a primary amine and alcohol over the methanol synthesis industrial catalyst SNM-1

Vapor-phase reactions ofn-pentan-1-ol with 2-ethylhexyiamine and ofn-heptan-1-ol with cyclohexylamine occurring in the presence of an industrial oxide copper-zinc-aluminum catalyst SNM-1 at 175–185°C have been found to afford the corresponding asymmetric secondary and tertiary amines in yields of 59–99 % and 5–49 %, respectively.

Catalytic N-alkylation of primary amines by alcohols

A study has been made of the vapor phase N-alkylation of cyclohexylamine by n-1-heptanol or n-1-pentanol on an industrial copper-zinc-aluminium oxide catalyst and a reduced, promoted sintered iron catalyst. Yields of amines are described.

Piperidine-modified fischer-tropsch synthesis

N-Alkylpiperidines with alkyl fragment length from C1 to Cl5 were synthesized by the reaction of CO + H2 + piperidine. The molecular mass distribution of the N-alkylpiperidines has two different distribution parameters α. Thus, α=0.45±0.03 for C1-C5 alkyl fragments, while α=0.65±0.02 for C6-C15. Piperidine was found to act as a modifier reagent and chemical trap for the intermediates in the synthesis reaction.