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The catalytic performance and corrosion inhibition of CuCl/Schiff base system in homogeneous oxidative carbonylation of methanol by Wanling Mo; Hui Xiong; Tao Li; Xiaochuan Guo; Guangxing Li is a Chemistry article available to read on EtoBox.

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A homogeneous catalytic system, CuCl/Schiff base, was studied in the synthesis of dimethyl carbonate (DMC) by oxidative carbonylation of methanol. It was found that among a number of Schiff bases studied, 1,10-phenanthroline (phen) was the most effective promoter in terms of both the catalytic activity and the corrosion inhibition. The catalytic performance of CuCl was enhanced dramatically and the corrosion of the reaction system was effectively inhibited when phen was used as a ligand. At a reaction condition with a catalyst concentration of 0.2 mol/L, n Cu /n phen = 2:3, temperature = 120 • C, time = 2 h, P = 2.4 MPa and P CO /P O 2 = 2 : 1, the conversion of methanol is 23.7%, the selectivity to dimethyl carbonate is 98.3% and the TON is 14.4. The catalytic activity increased by about 270% and the lifetime increased by greater than threefold relative to the CuCl catalyst without addition of phen. The corrosion rates to the HC276 and HC686 stainless steels by the CuCl/phen catalyst are 0.0282 and 0.0071 mg/h. In comparison with CuCl catalyst, the inhibition efficiencies (IE) on HC276 and HC686 stainless steel are 95.4% and 98.5%, respectively, under the same reaction conditions.

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Author

Wanling Mo; Hui Xiong; Tao Li; Xiaochuan Guo; Guangxing Li

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1381-1169)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)