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.1016/j.dyepig.2004.01.009 . 19. Rageh , NM 2004 Tautomeric structures, electronic spectra, acid-base properties of some 7-aryl-2,5-diamino-3(4-hydroxyphenazo

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in several organocationic reactions in which textural and acid–base properties were dependent on a number of variables such as aluminum salt, precipitating agent, or calcination temperatures [ 3 – 7 ]. Thus, in the last few years many works have

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. Scanning electron microscopy (SEM) was employed to study the morphology and crystallite size of zeolites. The SEM images were recorded over a Hitachi S-800 electron microscope operated at 5 kV. The acid–base property of zeolite was characterized by having

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with the OH groups on the surface of the amphoteric γ-Al 2 O 3 support yet during the impregnation and drying steps [ 16 , 23 ], should also affect the WGS reaction by changing the acid–base properties of the system. Certainly, the latter

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