Applications of Gas Chromatography in Catalysis

Abstract

Applications ofGas Chromatography in Catalysis L. K. Doraiswamy was born on May 18, 1927, and received his MS in chemical engineering from the University of Wisconsin in 1950 and his PhD in chemical engineering from the same University in 1952. After working for a year with R. L. Carlisle Chemical and Manufacturing Company, Brooklyn, Dr. Doraiswamy joined the Chemical Engineering Division of National Chemical Laboratory at Poona, India, in 195j. At present, he is Head, Division of Chemical Engineering and Process Development. He has published about 50 papers, mostly in chemical reaction engineering and chemical engineering thermodynamics, and has been associated with the development of several processes at the National Chemical Laboratory which are now in operation in India. Vasant R. Choudhary, born Nov. 28, 19j.j, is a research fellow at the National Chemical Laboratory, Poona, India. He received his bachelor of science (1965) and master of science (1967) degrees in chemistry from the University of Poona in First Class. His fields of interest are kinetics and heterogeneous catalysis.

Mass Transfer of Alkanes in Zeolite Packed-Bed Reactors Studied with Positron Emission Profiling (PEP). 1. Experiments

“…Chromatography has been extensively used over the last four decades to measure kinetic parameters of heterogeneously catalyzed chemical reactions. Several excellent reviews on this subject have been published (Yanovskii and Berman (1992); Suzuki and Smith (1971); Choudhary and Doraiswamy (1971)). As with all transient techniques, chromatography offers the ability to measure the rates of several processes simultaneously rather than only that of the rate-determining step.…”

Characterisation of Catalysts and Adsorbents by Inverse Gas Chromatography

“…When the sample enters into the column, there is a distribution between phases, and the concentration profiles takes the shape of a plateau, preceded by a breakthrough curve. The shape of this curve is characteristic of each system [3]. The benefit of the frontal technique is that equilibrium can be always established due to its continuous nature while pulse chromatography requires the assumption of a fast equilibration of the probe molecule adsorption on the surface.…”

“…Taking into account these considerations, adsorption isotherms can be obtained either from the ideal GC, at conditions of infinite dilution, or by non-ideal and non-linear chromatography, at conditions of finite dilution. Ideal GC is described here, whereas finite chromatography isotherms determination can be found in the literature [3,12]. At conditions in a chromatographic columns which approach the requirements of ideal IGC (minimum of van Deemter curve), the following hypothesis can be supposed:…”

A Kinetic Model for the Isomerization of n-Butene to Isobutene

“…There has been no attempt made so far to explain this reaction on the basis of a heterogeneous model. The present work was therefore undertaken to propose a plausible Hougen-Watson (Langmuir-Hinshelwood) type rate model for this reaction over fluorinated -alumina containing 1 wt % fluorine, selected in an earlier study by the group screening technique (Choudhary and Doraiswamy, 1971). The data were obtained in a rotating basket continuous stirred gas-solid reactor developed by Choudhary and Doraiswamy (1972) for determining the precise values of the rates without the influence of heat and mass transfer resistances.…”