TY - JOUR
T1 - Factors limiting selectivity in C3 and C4 amm(oxidation) reactions
AU - Costine, A.
AU - Hodnett, B. K.
PY - 2005/8/18
Y1 - 2005/8/18
N2 - An extensive data-mining study of C3 and C4 selective oxidation and ammoxidation reactions occurring in the gas phase over solid catalysts has been conducted. The reactions include the amm(oxidation) of propane, propene, isobutane and isobutene to produce α,β-unsaturated mononitriles and unsaturated carboxylic acids. Selectivity-conversion plots were generated for each reaction from the patent and scientific literature. For each reaction there is a clear upper limit in terms of selectivity-conversion beyond which experimental studies have not advanced. The results show that for some reactions, such as the oxidation of isobutane to methacrylic acid, high product selectivities are never realised due to the production of by-products via parallel oxidation of reaction intermediates, and more importantly, via consecutive oxidation of the unstable product. However, for the reactions of propane amm(oxidation) to produce acrylonitrile and acrylic acid the situation appears to be different. For these reactions, the central problem resides in the inability of conventional catalysts to suppress the propensity of the propene intermediate to desorb and oxidise further to oxides of carbon, rather than the loss in acrylic acid or acrylonitrile selectivity via consecutive oxidation.
AB - An extensive data-mining study of C3 and C4 selective oxidation and ammoxidation reactions occurring in the gas phase over solid catalysts has been conducted. The reactions include the amm(oxidation) of propane, propene, isobutane and isobutene to produce α,β-unsaturated mononitriles and unsaturated carboxylic acids. Selectivity-conversion plots were generated for each reaction from the patent and scientific literature. For each reaction there is a clear upper limit in terms of selectivity-conversion beyond which experimental studies have not advanced. The results show that for some reactions, such as the oxidation of isobutane to methacrylic acid, high product selectivities are never realised due to the production of by-products via parallel oxidation of reaction intermediates, and more importantly, via consecutive oxidation of the unstable product. However, for the reactions of propane amm(oxidation) to produce acrylonitrile and acrylic acid the situation appears to be different. For these reactions, the central problem resides in the inability of conventional catalysts to suppress the propensity of the propene intermediate to desorb and oxidise further to oxides of carbon, rather than the loss in acrylic acid or acrylonitrile selectivity via consecutive oxidation.
UR - http://www.scopus.com/inward/record.url?scp=22944485354&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2005.05.032
DO - 10.1016/j.apcata.2005.05.032
M3 - Article
AN - SCOPUS:22944485354
SN - 0926-860X
VL - 290
SP - 9
EP - 16
JO - Applied Catalysis A, General
JF - Applied Catalysis A, General
IS - 1-2
ER -