Bulletin of Chemical Reaction Engineering & Catalysis
2021: BCREC Volume 16 Issue 1 Year 2021 (March 2021)

Study on Ammonia-induced Catalyst Poisoning in the Synthesis of Dimethyl Oxalate

Hua-wei Liu (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Sheng-tao Qian (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Er-fei Xiao (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Ying-jie Liu (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Jun Lei (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Xian-hou Wang (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)
Yu-hua Kong (Gas Purification Division of Haiso Technology Co., Ltd, Hubei Industrial Gas Purification and utilization Key Laboratory, Wuhan 430074)



Article Info

Publish Date
31 Mar 2021

Abstract

On an industrial plant, we observed and examined the ammonia-poisoning catalyst for the synthesis of dimethyl oxalate (DMO). We investigated the catalytic activity in response to the amount of ammonia and revealed the mechanism of such poisoning by X-ray photoelectron spectroscopy (XPS) characterization. Our results show that only 0.002% ammonia in the feed gas can significantly deactivate the Pd-based catalyst. Two main reasons were proposed: one is that the competitive adsorption of ammonia on the active component Pd hinders the carbon    monoxide (CO) coupling reaction and the redox cycle between Pd0 and Pd2+; and the other is that the high-boiling nitrogen-containing amine compounds formed by reacting with ammonia have adsorbed on the catalyst, which hinders the progress of the catalytic reaction. The deactivation caused by the latter is irreversible. The catalytic activity can be completely restored by a low-temperature liquid-phase in-situ regeneration treatment. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Copyrights © 2021






Journal Info

Abbrev

bcrec

Publisher

Subject

Chemical Engineering, Chemistry & Bioengineering Chemistry

Description

Bulletin of Chemical Reaction Engineering & Catalysis (e-ISSN: 1978-2993), an international journal, provides a forum for publishing the novel technologies related to the catalyst, catalysis, chemical reactor, kinetics studies, and chemical reaction ...