caa a22 4500 467919631 CHVBK 20180406152913.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s00706-006-0552-7 doi (NATIONALLICENCE)springer-10.1007/s00706-006-0552-7 El-Sharkawy El-Sayed A. Chemistry Department, College of Education at Al-Arish, Suez Canal University, Al-Arish, Egypt aut Non Aqueous Titration and Catalytic Conversion of Cyclohexanol as a Test of Surface Acidity [Elektronische Daten] [El-Sayed A. El-Sharkawy] Summary.: The textural characteristics, including surface area, mean pore diameters, and total pore volume of Cr2O3-CuO/Al2O3 solid catalysts were determined from the low temperature adsorption of N2 at 77 K. The structural properties were investigated using XRD. The surface acidity of calcined samples was determined using two comparable methods, including the non-aqueous titration of acidic groups with n-butylamine and dehydration/dehydrogenation activity of cyclohexanol. XRD patterns assigned a crystalline CuO and γ-Al2O3 for 723 K calcinations products of lower Cr2O3 content. The gradual increase of calcinations temperature promoted the crystallinity of Cr2O3 and resulted in solid-solid interaction of CuO and Cr2O3 forming CuCr2O4. The textural parameters varied with both calcinations temperature and catalyst composition. The surface acid density (DAS) increased with the increase of chromia content up to 0.132 mole% Cr2O3, while the rise of calcinations temperature led to a decrease of surface acidity. The dehydration/dehydrogenation of cyclohexanol as well as n-butylamine titration succeeded in characterizing of surface acidity. Springer-Verlag, 2006 Keywords. Al2O3 nationallicence Cr2O3 nationallicence CuO nationallicence Magnetic susceptibility nationallicence Surface acidity nationallicence Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/12(2006-12-01), 1487-1498 0026-9247 137:12<1487 2006 137 706 https://doi.org/10.1007/s00706-006-0552-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00706-006-0552-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- El-Sharkawy El-Sayed A. Chemistry Department, College of Education at Al-Arish, Suez Canal University, Al-Arish, Egypt aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/12(2006-12-01), 1487-1498 0026-9247 137:12<1487 2006 137 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer