期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 366, 期 -, 页码 492-500出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.11.112
关键词
SCR catalysts; Pb-poisoned; As-poisoned; Acetic acid; Regeneration; NOx
资金
- National Natural Science Foundation of China [21376072]
- Fundamental Research Funds for the Central Universities [2017MS140]
Being poison to heterogeneous catalysts, Pb and As are important metals in the study of industrial NO,, emission reductions. A series of V2O5-WO3/TiO2-SiO2 catalysts poisoned by Pb and As were prepared through wet impregnation. The regeneration effect of deionized water, acid solution, complexing agent, and alkali solution on a poisoned catalyst was evaluated through experimental and theoretical calculations. For a Pb-poisoned catalyst, deionized water, acetic acid, and triethylenetetramine were used to wash. NO conversion rate on the Pb-V2O5-WO3/TiO2-SiO2 catalyst increased from approximately 59.49% to 95.70%, which is 98.43% of the efficiency of the original fresh catalyst. As for an As-poisoned catalyst, deionized water, acetic acid solution, and sodium carbonate solution were used to wash, and the NO,, conversion rate on the As-V2O5-WO3/TiO2-SiO2 catalyst increased from approximately 64.05% to 80.76%, which is 98.45% of the original efficiency of the fresh catalyst. The specific surface areas of the lead and arsenic regeneration catalyst were 46.41 m(2)/g and 45.95 m(2)/g respectively, approximately 14.00% and 11.02% higher than that of the poisoned catalyst (40.71 m(2)/g and 41.39 m(2)/g). The study provides a new method for the regeneration of SCR catalysts, which is particularly applicable for regenerating a large number of Pb- and As-poisoned catalysts.
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