NOPR Collection:

Electrosynthesis of yttrium from non-aqueous bath

Sat, 01 Apr 1995 00:00:00 GMT

Title: Electrosynthesis of yttrium from non-aqueous bath Authors: Mohite, UK; Gadave, K M; Lokhande, C D Abstract: Electrodeposition of yttrium has been carried out from formaldehyde bath onto different substrates such as stainless steel, copper, brass, titanium and Indium Tin Oxide (ITO) coated glass. The deposition potentials are found to be substrate, solvent and complexing' agent dependent. Sodium acetate was found to be a suitable complexing agent for the depositon. Uniform and white gray films of yttrium of thickness between 0.4-0.5 micons have been doposited. Page(s): 93-94

Calibration of hydrometers at NPL

Sat, 01 Apr 1995 00:00:00 GMT

Title: Calibration of hydrometers at NPL Authors: Sharma, D C; Sinha, S; Verma, S; Nagia, S N Abstract: Hydrometry is a simple approach to measure density of a liquid using laws of flotation. Reference (Standard). hydrometers which are used to calibrate normal hydrometers by comparison process are calibrated by hydrostatic weighing method. Optimum accuracy may be achieved by hydrometers only if all relevant corrections are incorporated in the calibration process. This paper highlights the salient features of hydrometry. Page(s): 89-92

The role of metal-support interactions in sintering and themal deactivation of HDS/HDN catalysts

Sat, 01 Apr 1995 00:00:00 GMT

Title: The role of metal-support interactions in sintering and themal deactivation of HDS/HDN catalysts Authors: Marinkovic-Neducin, R; Putanov, P Abstract: The sintering process in CoO-MoO₃/Al₂O₃ and NiO-MoO₃/Al₂O₃ catalysts for HDS/HDN has been studied using two industrial catalysts and their model systems, subjected to thermal treatment in Qxidizingand reducing atmospheres. The critical role of oxidizing atmosphere for rapid sintering has been found to be connected with the formation of free MoO₃ phase, distinguished by high mobility in lower temperature regime and intermediary presence of liquid phase at higher temperatures. A prerequisite for HDS/HDN catalyst sintering during regeneration is the destruction of active monolayer structure that results in formation of the precursor of MoO₃ phase. Specific role of metal-support interactions in this deactivation mechanism has been shown by comparative investigation on model systems prepared on more inert supports (ɑ-Al₂O₃ and SiO₂). Page(s): 83-88

Building materials from granulated blast furnace slag-Some new prospects

Sat, 01 Apr 1995 00:00:00 GMT

Title: Building materials from granulated blast furnace slag-Some new prospects Authors: Malhotra, S K; Tehri, S P Abstract: A fairly large quantity of granulated blast furnace slag is being used in the manufacture of portland slag cementand supersulphated cement. Effortsbave beenmade at this Institute to explore other possiblewaysto utilize the surplus slagin the development of cementitious binders suitable for masonry and building bricks. The properties of these materials have been found to be comparable in properties to the specifications of conventional materials. The production of these materials have potential for partial replacement of high energy consuming portland cement and burnt clay bricks. Page(s): 80-82