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The XRD patterns of the prepared CsM-SiO2 catalysts and silicon dioxide are presented. Compared to the SiO2 X-ray diffraction patterns with intensities (20, 26.7) diffraction peak for Cs25- SiO2 and Cs30-SiO2 were reduced slightly to indicate that the original mesostructure of SiO2 was changed. Further, similar intensity of peaks to SiO2 was found for Cs15-SiO2. This pattern peak results indicated that SiO2 hexagonal structure retained after increasing the cesium loading up to 30 wt. % prior to 10 wt. % of cesium amount. Also, increasing the cesium in ions might cause some portions of SiO2 mesopore walls to be exposed to cesium and could not be protected from the reaction to form cesium silicate and led to partial destruction of mesoporous structure.

The silicon dioxide diffraction peaks detected at 20.9°, 26.7°, 36.38°, 39.46°, 40.28°, 50.2°, 60.2°, and 68.5° can be attributed to triclinic-phase SiO2. This crystalline nature can be observed for catalyst samples with weak diffraction peaks due to the added Cs+ and some extra peaks at 20.76°, 36.38° and 46.53° for cubic-phase Cs2O. Cesium oxide was synergetic as expected and led to a decrease in grain size. This phenomenon induced the formation of Cs+ ion clusters surrounding the Cs-SiO2 with significantly altered surface reactivity, and these clusters are responsible for the high activity. The application of silica support catalyst showed in higher reactivity because of structural stability of catalysts.

The major chemical groups in silicon dioxide and supported CsM-SiO2 catalysts are identified by the FTIR spectra. The characteristic absorption peaks at 460–619 cm-1 are assigned to the bond structure vibration of the M+–O, and the characteristic absorption at 785 and 990 cm-1 are assigned to the M+–OH band deformation to Si–O–M+ and O–Si–O stretching is shown at 1630 and 1080 cm-1. nano-silica Since the nano-silica (SP30) has a small size effect, surface and interface effect, quantum size effect and macroscopic quantum tunneling effect and special optical and electrical properties, high reluctance phenomenon, the phenomenon of non-linear resistance at high temperature and high strength remain , high toughness, good stability singularity, nano-silica (SP30) can be widely applied in various fields, and has broad prospects and huge commercial value. Nano-Silicon Dioxide is different from Silicon Dioxide. Nano-Silicon Dioxide(with VK-SP30) is one of the earlier application of nano-materials, nano-SiO2 on the rubber-modified, engineering plastics, ceramics, biomedical, optics, building materials, resin-based composite applications are modified in there have been reported many times, here we focuses on nano-silica (with VK-SP30) progress in other areas. Nano-silica (SP30) as one of the nanomaterials, has important practical significance for its development. Study of nanomaterials has made many achievements, but the application of nano-SiO2 has just started, with in-depth study of nano SiO2, widening applications, nano-silica (SP30) will further industrialization, nano-silica ( SP30) materials will be bound to attract more attention, it will open up broader prospects.



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