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Structural and acidic characteristics of Cu–Ni-modified acid-leached mordenites by Mohamed Mokhtar Mohamed is a Chemistry article available to read on EtoBox.
What is Structural and acidic characteristics of Cu–Ni-modified acid-leached mordenites about?
Two series of dealuminated Na-mordenite zeolites (DML and DMH) were impregnated, in comparison with the parent nondealuminated NaMSP, in aqueous nitrate solutions of Cu and Ni to achieve varying loadings for both of the cations. These samples were characterized by N 2 adsorption, XRD, DSC of ammonia desorption, ammonia volumetric sorption, IR of ammonia adsorption, and FTIR-photoacoustic (FTIR-PAS) techniques. The FTIR-PAS spectrum of CuNi-loaded NaMSP shows a band at 935 cm -1 ascribed to O 3 Si-O-SiO 3 linkages produced as a result of dealumination caused by the synergistic effect of Cu and Ni cations under the preparation conditions. As a confirmation, this band was intensified upon acid dealumination (DML) where, at the extent of dealumination (DMH), collapsing of the zeolite structure was obtained subsequent to cation modification. In addition, the dealumination effect was markedly enhanced upon increasing the load of Cu in proportion to Ni. A total erosion of OH group characteristics of Si-(OH)-Al at 3610 cm -1 was depicted when the Ni content exceed that of Cu where it did not show any change when the Cu content surpasses that of Ni. The amount of adsorbed ammonia measured v
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- Author
- Mohamed Mokhtar Mohamed
- Publisher
- Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)
- Published
- 2003
- Language
- EN
- Field
- Chemistry (Physical Sciences)