Detail of "135-98-8"

Reference

Site energy distribution and catalytic properties of microporous crystalline AlPO4-5

Site energy distribution and catalytic properties of microporous crystalline AlPO4-5. Choudhary, Vasant R.; Akolekar, Deepak B. (Chem. Eng. Div., Natl. Chem. Lab., Pune 411 008, India). J. Catal., 103(1), 115-25 (English) 1987. CODEN: JCTLA5.In this article, certain chemicals are used. Some of their cas registry numbers are 64-17-5 and 98-06-6 ISSN: 0021-9517. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 25, 67 The site energy distribution on cryst. mol. sieve AlPO4-5 is very broad. AlPO4-5 possesses a significant catalytic activity in the cracking of hydrocarbons (cumene [98-82-8], hexane [110-54-3], isooctane [540-84-1], butylbenzene [104-51-8], sec-butylbenzene [135-98-8], and tert-butylbenzene [98-06-6]), isomerization of o-xylene [95-47-6] and disproportionation of MePh [108-88-3] and also in conversion of MeOH [67-56-1] and EtOH [64-17-5] to arom. at 673 K. However, the catalytic activity in the above reactions varies significantly with the pulse no. due to coke deposition, which has both detrimental and beneficial effects on the catalytic processes. AlPO4-5 contains both Lewis and protonic acid sites. The acid sites (particularly the protonic ones) are responsible for its catalytic activity. However, its strong acid sites are very small in no. as compared to those on zeolites. The cryst. microporous aluminophosphate (AlPO4-5) possesses much higher acidity and catalytic activity than the amorphous aluminophosphate. .

Acid-base properties and cracking activity of crystalline and amorphous silica-alumina

Acid-base properties and cracking activity of crystalline and amorphous silica-alumina. Vinek, H.; Lercher, J. A.; Noller, H. (Inst. Phys. Chem., Tech. Univ. Wien, Vienna A-1060, Austria). Geterog. Katal., 5th, Pt.Several substances with their cas registry numbers 110-86-1 and 1344-28-1 may be metioned in this study. 2, 333-8 (English) 1983. CODEN: GEKADD. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 67 In Al2O3-SiO2 cracking catalysts derived from NaX zeolite, the acidity increased as the Na content decreased between ASX1 and ASX2 zeolites. The surface d. of strong Lewis acid sites was enhanced by HCl treatment, but the surface d. of Broensted acid sites dropped sharply thereafter. Excessive dealumination worsened the accessibility of electron pair acceptor sites. In the cracking of 2-phenylbutane [135-98-8], the reaction rate consts. for the amorphous oxides (esp. ASX3) were 5 times higher than those for the zeolitic ASX1 and ASX2; the presence of water temporarily enhanced the cracking activity of the latter. .