Hydrocarbon Conversion Processes Research Articles

Properties and applications of boron-containing pentasil type zeolites

Boron-containing zeolites of the ZSM-5 type exhibit modified structural and surface chemical properties as compared to pure aluminosilicates of similar structure. These property changes are reflected in acid catalyzed reactions in which catalysts prepared on the basis of these so-called H-SABO molecular sieves show a higher time-on-stream stability and a more advantageous product selectivity than conventional ZSM-5 containing catalysts. Some potential industrial applications for hydrocarbon conversion processes are discussed.

ChemInform Abstract: Hydrocarbon Oxidation by Antimony Pentafluoride.

AbstractWhen isobutane is mixed at ‐80 °C with excess SbF5 in SO2ClF at ‐80 °C and the temp. is raised to ‐30 °C, the reaction observed is: 2 Me3CH + SbF5 → 2 tBu+ + 2 F‐ + SbF3 + H2.

Hydrocarbon oxidation by antimony pentafluoride

Acid-catalyzed hydrocarbon conversion processes such as isomerization, alkylation, and cracking are industrial transformations of high economic importance. The common key step in these reactions is the formation of the reactive trivalent carbocations. In this work, they report experimental proof of the direct oxidation of isobutane by antimony pentafluoride to the tert-butyl cation. The presence of a proton trap shows that the proton is not essential for this ionization process.

Catalysts for hydrocarbon conversion processes

Catalysts for hydrocarbon conversion processes

Electron Microscopy of Bimetallic Catalysts under Controlled Atmosphere

Over recent years there has been considerable interest in the behavior of supported bimetallic systems. They exhibit unusual product selectivity patterns and have a high tolerance toward carbon deposition, features which make them very attractive as catalysts for a variety of hydrocarbon conversion processes. One of the most intriguing problems related to bimetallic catalysts is the question of what is the composition of the surface during exposure to a reactant gas. A number of workers have attempted to solve this issue by the use of sophisticated surface chemical tools, however, many of these approaches suffer from a common limitation, namely, that specimens can only be examined in a post-reaction state and under high vacuum conditions. These drawbacks are readily overcome by controlled atmosphere electron microscopy (CAEM), where it is possible to continuously observe the appearance of a specimen while it is undergoing reaction.