Using InCl vapor to ion exchange indium into zeolite Na–X. II: A single crystal structure containing (In8Cl8)16+, In57+–Cl−–In57+, and In+

Sen, Dipak; Kim, Jong Jin; Kang, Ho‐Cheol; Heo, Nam Ho; Seff, Karl

doi:10.1016/j.micromeso.2012.08.012

Cited by 35 publications

(18 citation statements)

References 86 publications

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“…The smallest percentage of Ni 2+ ion exchange shown by Na‐P/NaBr may be because Na + ions are distributed in different parts of the zeolite framework with different stability. Some of them are distributed in the channel of zeolites where it is easy to exchange with Ni 2+ , while others in the crystal lattices are more stable and it is harder for them to ion exchange under normal temperatures …”

Section: Resultsmentioning

confidence: 99%

Pure zeolite Na‐P and Na‐X prepared from coal fly ash under the effect of steric hindrance

Chen

Xie

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND Coal fly ash (CFA) is a solid waste generated during combustion and transformation of coal that causes serious environmental pollution because of the huge amount of emissions and subsequent accumulation. In this work, coal fly ash was selected as a source of silicon and aluminum components to synthesize zeolites Na‐P and Na‐X. RESULTS High purity zeolites Na‐P and Na‐X were synthesized under hydrothermal conditions. The influences of an organic steric agent and different sodium salts on the preparation were investigated and the process parameters of the hydrothermal system optimized. The synthesized product was further characterized by XRD, SEM, ICP, FTIR, and BET surface area measurements. Adsorption tests of Na‐P and Na‐X zeolite for Ni2+ were performed and flame atomic absorption spectrometry (FAAS) was used for the detailed analysis. CONCLUSION Pretreatment and purification of CFA favors the preparation of pure Na‐P and Na‐X zeolite. The organic steric agent and different sodium salts were used to decrease the grain size of the product and control the purity and yield, respectively. Zeolite Na‐P synthesized with the addition of TEA (triethanolamine) had the best Ni2+ adsorption performance and a hypothesis for Ni2+ adsorption is proposed. Preliminary analysis proved that Van der Waals absorption is the main type of adsorption for the porous zeolite but ion exchange could also occur with the effect of metal ion exchange contributing a maximum of 13.56% to the total adsorption capacity. © 2015 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Pure zeolite Na‐P and Na‐X prepared from coal fly ash under the effect of steric hindrance

Chen

Xie

et al. 2015

J of Chemical Tech & Biotech

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“…The composition of a zeolite can therefore be tailored by simply contacting the solid with a solution of the corresponding metal salt. [229][230][231][232] A large number of alkali cations (e.g. K + and Cs + ) have been introduced to the cavities of zeolites without alteration of the crystallinity, which endows the zeolites with basic properties.…”

Section: Nitrogen Incorporationmentioning

confidence: 99%

Design and fabrication of mesoporous heterogeneous basic catalysts

2015

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Mesoporous solid bases are extremely desirable in green catalytic processes, due to their advantages of accelerated mass transport, negligible corrosion, and easy separation. Great progress has been made in mesoporous solid bases in the last decade. In addition to their wide applications in the catalytic synthesis of organics and fine chemicals, mesoporous solid bases have also been used in the field of energy and environmental catalysis. Development of mesoporous solid bases is therefore of significant importance from both academic and practical points of view. In this review, we provide an overview of the recent advances in mesoporous solid bases, which is basically grouped by the support type and each category is illustrated with typical examples. Cooperative catalysts derived from the incorporation of additional functionalities (i.e. acid and metal) into mesoporous solid bases are also included. The fundamental principles of how to design and fabricate basic materials with mesostructure are highlighted. The mechanism of the formation of basic sites in different mesoporous systems is discussed as well.

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“…[8][9][10][11][12] In general, there are two predominant methods to fabricate Cu(I) ion-exchanged zeolites, that is, (i) direct introduction of Cu(I) and (ii) introduction of Cu(II) followed by selective reduction. [16][17][18] In the case of SSIE, nely dispersed powders of a zeolite and a compound (e.g. In a typical VPIE process, the zeolite is separated from the volatile compound of the incoming cations, so that only their gas phase can interact with the zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…CuCl) evaporated is not sufficient for complete exchange. [16][17][18] In the case of SSIE, nely dispersed powders of a zeolite and a compound (e.g. CuCl) are mixed intimately and heated to a relatively high temperature (>500 C) to promote ion exchange.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature fabrication of Cu(i) sites in zeolites by using a vapor-induced reduction strategy

et al. 2015

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Due to their versatility, nontoxicity, and low cost, Cu(I) ion exchanged zeolites are of great interest for various applications. Despite many attempts, the development of an efficient, controllable, and energysaving approach to fabricate Cu(I) sites in zeolites remains an open question. In this study, a strategy was developed to convert Cu(II) in zeolites to Cu(I) selectively using vapor-induced reduction (VIR) with methanol. The methanol vapors generated at elevated temperatures diffuse into the pores of zeolites and interact with Cu(II) ions, leading to the formation of Cu(I). This strategy allows the construction of Cu(I) sites at low temperatures and avoids the formation of Cu(0). Moreover, the obtained material exhibits excellent performance in the adsorptive separation of propylene/propane with regard to both capacity and selectivity, which is obviously superior to the material prepared by the conventional autoreduction method as well as using various typical adsorbents.

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Using InCl vapor to ion exchange indium into zeolite Na–X. II: A single crystal structure containing (In8Cl8)16+, In57+–Cl−–In57+, and In+

Cited by 35 publications

References 86 publications

Pure zeolite Na‐P and Na‐X prepared from coal fly ash under the effect of steric hindrance

Pure zeolite Na‐P and Na‐X prepared from coal fly ash under the effect of steric hindrance

Design and fabrication of mesoporous heterogeneous basic catalysts

Low-temperature fabrication of Cu(i) sites in zeolites by using a vapor-induced reduction strategy

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