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Competitive Transient Electrostatic Adsorption for In Situ Regeneration of Poisoned Catalyst
Author(s) -
Pan Yanbo,
Shen Xiaochen,
Yao Libo,
Bentalib Abdulaziz,
Yang Jinlong,
Zeng Jie,
Peng Zhenmeng
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201802055
Subject(s) - catalysis , adsorption , desorption , catalyst poisoning , chemical engineering , ion , decomposition , materials science , chemistry , catalyst support , organic chemistry , engineering
Catalyst deactivation by poisoning species is one important concern in catalysis processes and causes significant catalyst material and operation costs due to process shutdown and catalyst replacement. We report one new in situ catalyst regeneration method, which utilizes competitive electrostatic adsorption of charged ions which are generated with moderate DC voltage supply following the Townsend discharge mechanism to desorb poisoning species and the transient characteristic of electrostatically adsorbed ions to recover the active sites for catalysis. We demonstrate effectiveness of this new concept using HCOOH decomposition on Pt catalyst as model reaction and find the deactivated Pt regains the activity in presence of Ar + generation. DFT simulations and classical electrical discharge calculations show Ar + ions have significantly higher electrostatic adsorption energy than desorption energy of CO poisoning species that helps to desorb CO from Pt and generate more available active sites. This new in situ catalyst regeneration method, with convenient, noninvasive and low operation cost features, provides a promising strategy to overcome the challenges associated with current technologies that handle catalyst deactivation.