期刊
CHEMICAL ENGINEERING JOURNAL
卷 354, 期 -, 页码 85-92出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.195
关键词
Cu-SAPO-34; Hydrothermal stability; Deactivation; Cycle hydration; NH3-SCR
资金
- National Natural Science Foundation of China [21473182, 91545104, 21606221, 21676262]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-JSC040]
- China Postdoctoral Science Foundation [2017M621169]
Low-temperature hydration experiments are designed to explore the influence of hydration time and cycle hydration on the stability of Cu-SAPO-34 catalyst. All the hydration treatments are conducted at 80 degrees C. Experiments on the impact of hydration time reveal that a fast activity loss for Cu-SAPO-34 occurs at the initial hydration stage of 30 min, and further extending the time until 24 h only leads to a much slower drop rate. Conversely, cycle hydration, which is close to the working conditions of the SCR catalyst, causes a continuous activity drop as the increase of hydration cycles (steaming for 30 min/cycle). Multiple characterizations reveal that in comparison with hydration time method, cycle hydration induces a faster loss of acid sites and decrease of reducibility of isolated Cu2+ to Cu+, both of which cause the severer deactivation of the catalyst. This occurs due to the repeated high-temperature treatments involved in the cycle hydration treatment, which promote the migration of Cu ions among the CHA cages, cause a fast deterioration of Bronsted acid sites, and thus obviously alter the micro-environments of Cu ions and their reducibility.
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