Ueber die Glimmerscheinung beim Erhitzen der Oxyde von Cr, Fe, Zr, Ti und Magnesiumpyrophosphat

Rapid genesis of active phase during calcination of promoted sulfated zirconia catalysts

“…for pure zirconium hydroxide, show a sharp exothermic peak at around 725 K [2,27]. This "glow phenomenon" is not unique to zirconia; it has been observed for hydroxides of iron, chromium, and titanium [28][29][30][31] and is of general importance for the preparation of many catalysts. Tatsumi et al correlated the catalytic activity of sulfated zirconia for n-pentane isomerization with the exotherm profile [32].…”

Amorphous titanium hydrogenphosphate—an inorganic sorbent and a catalyst

“…The only exception is the occurrence of the exothermic peak. Most probably it is related to the decrease in the surface area, as already noticed in like compounds [40]. It should be noticed that the crystal structure of the material remained semicrystalline without signs of producing pyrophosphate groups upon transformations at temperatures below 380 • C.…”

oxo‐anion modified oxides

“…This violent reaction is designated in the literature as -glow phenomenon‖, relating to emission of visible light, and was first reported by Berzelius in 1812 [206,207]. For zirconia, it was first mentioned in 1818 [208] and soon more thoroughly investigated [209,210]. The phenomenon is also observed during the formation of chromium oxide, iron oxide and titania and is thus of general relevance; however, it does not occur during alumina formation [195,210].…”

“…For zirconia, it was first mentioned in 1818 [208] and soon more thoroughly investigated [209,210]. The phenomenon is also observed during the formation of chromium oxide, iron oxide and titania and is thus of general relevance; however, it does not occur during alumina formation [195,210]. Additives of any kind shift the glow event to higher temperature [189,190,196,917,204,205] and subdue or suppress it [193,195], for sulfate the exotherm temperature shifts linearly with content [190].…”