Detail of "13772-29-7"

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Structure and surface chemistry of crystalline zirconium phosphate catalysts

Structure and surface chemistry of crystalline zirconium phosphate catalysts. Segawa, K.Several substances are used for example 13772-29-7 and 54914-24-8 which are their cas registry numbers.; Nakata, S.; Asaoka, S. (Fac. Sci. Technol., Sophia Univ., Tokyo 102, Japan). Mater. Chem. Phys., 17(1-2), 181-200 (English) 1987. CODEN: MCHPDR. DOCUMENT TYPE: Journal CA Section: 67 (Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms) Section cross-reference(s): 22 The catalytic activities of isomerization of butenes and cyclopropane on cryst. Zr phosphates (ZrP) were examd. The ZrP catalyst calcined at ~800 K exhibited high catalytic activities. The coisomerization of d0- and d8-1-butene suggests that isomerization would proceed on protonic acid sites even after heat treatment at 1100 K. After evacuation of ~800K, most of the phosphate groups were removed, with consequent loss of H2O due to the condensation of phosphate groups between each Zr atom layer. However, a trace amt. of residual phosphate groups still remained on the surface. 31P magic-angle spinning NMR was employed to study the P micro-environments. The catalysts which showed higher activities showed higher 31P chem. shifts, suggesting that the phosphate groups remaining after evacuation at ~800 K may enhance the protonic acidity. .