Reference

Varistor

Varistor. (Marcon Electronics Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58182204 A2 25 Oct 1983 Showa, 5 pp. (Japanese). (Japan).Several substances with their cas registry numbers 1307-96-6 and 24304-00-5 may be metioned in this study. CODEN: JKXXAF. CLASS: IC: H01C007-10; C04B035-00. APPLICATION: JP 82-65641 19 Apr 1982. DOCUMENT TYPE: Patent CA Section: 76 (Electric Phenomena) The sintered varistor which maintains the shape of the grain boundary during sintering is based on ZnO with nitride additives such as AlN, Si3N4, NbB, CrN, Mg3N2, TiN, ZrN, TaN or VN. The rate of additives being introduced into 1 cm3 of sintered material is 105-2 ′ 107 particles. .

Catalyst for simultaneous hydrodesulfurization and hydrodemetalization of heavy crude oils

Catalyst for simultaneous hydrodesulfurization and hydrodemetalization of heavy crude oils. Morales, Alfredo L.; Galiasso, Roberto E.; Huskey, Donald; Carrasquel, Rafael (Dep. Invest. Proc., INTEVEP, S. A., Caracas 1070A, Venez.). Rev. Tec. INTEVEP, 3(2), 135-40 (Spanish) 1983. CODEN: RTEIDT. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 67 A special Ni-Mo/Al2O3 catalyst for the simultaneous hydrodesulfurization (HDS) and hydrodemetalization (HDM) of heavy crude oils or residues contg. high S, metals, and asphaltenes was developed. The effect of physico-chem. properties on activities was studied. 1307-96-6 and 1313-99-1 are cas registry numbers of chemicals which are used as reagents here. Particle size affects more the HDS than the HDM. The mean pore radius limits the rate of HDM, whereas the total surface area only affects the HDS. Ni or Co used for promoting the HDS are not so important for HDM. The catalyst was prepd. at bench scale and tested in a fixed bed reactor for >6 mo. The spent catalyst still has a high concn. of surface Mo even after 220 days on stream. The refined petroleum had its concns. of asphaltene, S, and V reduced by 56, 62, and 77%, resp. .