A carboxylic acid ester is prepared by a process comprising:
reacting an aldehyde and an alcohol in a liquid phase in the presence of molecular oxygen as indicated by the following reaction:
RCHO+R′OH+O2→RCOOR′+H2O
in the presence of a catalyst comprising at least palladium and an element X, wherein X is bismuth, lead or a combination thereof, supported on a carrier, wherein the catalyst has an acid strength, pKa, of more than 4.8 and shows an ammonia chemical adsorption amount at 0° C. of 0-150 &mgr;mol/g-catalyst.
一种
羧酸酯通过以下过程制备:
在液相中,在分子氧的存在下,反应醛和醇,反应如下所示:
RCHO+R′OH+O2→RCOOR′+
H2O
在至少包含
钯和元素X的催化剂的存在下进行,其中X是
铋、
铅或二者的组合,在载体上支撑,催化剂具有酸性强度pKa大于4.8,并且在0°C时显示
氨的
化学吸附量为0-150μmol/g-催化剂。