A comparative analysis of the protonated and copper exchanged mordenites with SiO&lt;SUB align="right"&gt;2/Al&lt;SUB align="right"&gt;2O&lt;SUB align="right"&gt;3 molar ratio equal to 10

Zhukov, Yu. M.; Kovalyov, A. N.; Kultaeva, Anastasia; Shelyapina, Marina G.; Petranovskii, Vitalii

doi:10.1504/ijnt.2016.074529

Cited by 6 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, even the first ion-exchange procedure led to the disappearance of the six-coordinated Al (line G2 in Figure 2); however, the G3 line was always observed in the CuH-MOR-10- XY series and was almost unchanged. The framework observed for the recovery of protonated zeolites after a conventional ion exchange with copper is much more spectacular for mordenites with a low Si/Al ratio (e.g., Si/Al = 5, see [25]). In the present study, for mordenites with a nominal value of Si/Al = 10, we observed that the MW-assisted procedure also helped eliminate the six-coordinated Al.…”

Section: Resultsmentioning

confidence: 99%

“…Earlier, we analyzed the influence of various factors in the preparation of copper exchange mordenites on the properties of the materials obtained [24,25,26,27,28]. In [27], we reported the results of our comprehensive study of two sets of copper-exchanged samples of mordenites prepared from the sodium form of this zeolite and obtained by two different methods: conventional and MW assisted.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive Analysis of the Copper Exchange Implemented in Ammonia and Protonated Forms of Mordenite Using Microwave and Conventional Methods

et al. 2019

View full text Add to dashboard Cite

This article presents the results of a comprehensive study of copper-exchanged mordenite samples prepared from its ammonia and protonated forms (Si/Al = 10) using two different ion exchange methods: conventional and microwave (MW)-assisted. The protonated H-MOR-10 sample was obtained by calcination of commercial NH4-MOR-10; in this case, a slight degradation of the mordenite framework was observed, but the resulting defects were partially restored after the first ion-exchange procedure of protons for copper ions. The level of copper exchange in the studied materials was found to be limited to 70%. Regardless of the exchange procedure, the replacement of ammonium or proton ions with copper led to a linear increase in the a/b ratio of cell parameters in accordance with an increase in the level of copper exchange, which means that all Cu2+ cations are ion-exchangeable and enter the main mordenite channel. Thermal analysis indicated a correlation between the replacement of various ammonium and hydroxyl groups by copper ions during the exchange treatment and their dehydroxylation energy during thermal decomposition. As a conclusion: MW-assisted treatment proved itself as an efficacious method for the synthesis of copper-exchanged mordenites, which not only significantly reduces preparation time but leads to a systematically higher copper exchange level.

show abstract

Section: Resultsmentioning

confidence: 99%