The Experts below are selected from a list of 20481 Experts worldwide ranked by ideXlab platform

Michelle D Klingshirn - One of the best experts on this subject based on the ideXlab platform.

S Shi - One of the best experts on this subject based on the ideXlab platform.

  • high temperature kinetics of the homogeneous reverse water gas shift reaction
    Aiche Journal, 2004
    Co-Authors: Felipe Bustamante, Robert M Enick, Anthony V Cugini, R P Killmeyer, Bret H Howard, Kurt S Rothenberger, Michael V Ciocco, Bryan D Morreale, S Chattopadhyay, S Shi
    Abstract:

    The high-temperature rate of reaction of the homogeneous, reverse water–gas shift reaction (rWGSR) has been evaluated in quartz reactors with rapid feed preheating under both low- and high-pressure conditions. The form of the power-law rate expression was consistent with the Bradford mechanism. The Arrhenius expressions for the reaction rate constant, corresponding to the empty reactor, were in very good agreement with the low-pressure results of Graven and Long, but yielded rate constants roughly four times greater than those obtained in our packed reactor and those reported by Kochubei and Moin and by Tingey. Reactor geometry was not responsible for these differences because computational fluid dynamics simulations revealed similar residence time distributions and comparable conversions when the same kinetic expression was used to model the rWGSR in each reactor. Most likely, the empty NETL reactor and the Graven and Long reactor did not attain an invariant value of the concentration of the Chain Carrier (H) at low reaction times, which led to an overestimation of the rate constant. Conversions attained in an Inconel® 600 reactor operating at comparable conditions were approximately two orders of magnitude greater than those realized in the quartz reactor. This dramatic increase in conversion suggests that the Inconel® 600 surfaces, which were depleted of nickel during the reaction, catalyzed the rWGSR. © 2004 American Institute of Chemical Engineers AIChE J, 50: 1028–1041, 2004

David A Dolson - One of the best experts on this subject based on the ideXlab platform.

A P Marchenko - One of the best experts on this subject based on the ideXlab platform.

  • living Chain radical polymerisation
    Russian Chemical Reviews, 2000
    Co-Authors: Gennadii V Korolev, A P Marchenko
    Abstract:

    The review is devoted to various types of compounds used as agents for 'living' radical polymerisation, such as alkoxyamines formed upon addition of the Chain Carrier radicals, R•, to stable nitroxyl radicals, as well as products of the addition of the radicals to transition metal complexes with different ligands, etc. In all cases, the mechanism of the action of these agents consists in their reversible dissociation A⇄R• + X•, where X• is a stable free radical or a metal-containing complex which can accept radicals R• (R• + X•→A) and thus compete with the quadratic Chain termination. Particular attention is paid to the studies which allowed a quantitative formulation of the mechanism of 'living' radical polymerisation in the form of a mathematical model suitable for predicting both the parameters of the polymerisation and the properties of the resulting polymer (molecular mass and polydispersity). The bibliography includes 359 references.

Felipe Bustamante - One of the best experts on this subject based on the ideXlab platform.

  • high temperature kinetics of the homogeneous reverse water gas shift reaction
    Aiche Journal, 2004
    Co-Authors: Felipe Bustamante, Robert M Enick, Anthony V Cugini, R P Killmeyer, Bret H Howard, Kurt S Rothenberger, Michael V Ciocco, Bryan D Morreale, S Chattopadhyay, S Shi
    Abstract:

    The high-temperature rate of reaction of the homogeneous, reverse water–gas shift reaction (rWGSR) has been evaluated in quartz reactors with rapid feed preheating under both low- and high-pressure conditions. The form of the power-law rate expression was consistent with the Bradford mechanism. The Arrhenius expressions for the reaction rate constant, corresponding to the empty reactor, were in very good agreement with the low-pressure results of Graven and Long, but yielded rate constants roughly four times greater than those obtained in our packed reactor and those reported by Kochubei and Moin and by Tingey. Reactor geometry was not responsible for these differences because computational fluid dynamics simulations revealed similar residence time distributions and comparable conversions when the same kinetic expression was used to model the rWGSR in each reactor. Most likely, the empty NETL reactor and the Graven and Long reactor did not attain an invariant value of the concentration of the Chain Carrier (H) at low reaction times, which led to an overestimation of the rate constant. Conversions attained in an Inconel® 600 reactor operating at comparable conditions were approximately two orders of magnitude greater than those realized in the quartz reactor. This dramatic increase in conversion suggests that the Inconel® 600 surfaces, which were depleted of nickel during the reaction, catalyzed the rWGSR. © 2004 American Institute of Chemical Engineers AIChE J, 50: 1028–1041, 2004