Surface and acidic properties of some mixed oxide catalysts in relation to their catalytic activities

摘要: Abstract A series of silica-alumina catalysts were prepared to contain different proportions alumina. The calcined at 773–973 K. Another silica-titania chemical compositions and between 773 973 textural properties (surface area pore structure) the determined by low-temperature nitrogen adsorption 77 surface acidity (acid amount acid strength) was for each catalyst thermal programmed desorption (TPD) pyridine. catalytic cracking cumene 673–773 K conversion isopropanol 473–593 investigated using microcatalytic technique. Cracking is a first-order reaction which takes place on relatively strong sites structurally sensitive. Dehydration mixed oxide zero-order proceeds most sites. related density insensitive.