http://nopr.niscpr.res.in/handle/123456789/29702 2026-10-09T08:46:02Z http://nopr.niscpr.res.in/handle/123456789/29865 Title: Suraface acidity/basicity of yttria and its mixed oxides with alumina catalysts Authors: Sugunan, S; Rani, G Devika; Unnikrishnan, P A Abstract: <span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Acid/base strength distribution of Y₂O₃ and its mixed oxides with alumina catalysts are measured on Hemmett acidity function scale and expressed in terms of <i style="mso-bidi-font-style:normal">Ho</i>_max value. Basicity of Y₂O₃ increases with increase in activation temperature and for mixed oxides the basicity increases with increase in concerntration of Y₂O₃in the catalysts.</span> Page(s): 245-246 1995-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/29864 Title: Characterization of coal flyash by ETIR, XRD and SEM Authors: Singh, Binay K; Rawat, Narendra S Abstract: <span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Different characterization techniques such as Fourier Transform Infrared spectroscopy, X-ray diffraction and Scanning Electron Microscopy have been applied to analyse the different fractions of flyash. FTIR studies show the presence of quartz, alumina, hermatite and different mineral matters whereas XRD confirm the presence of these menerals in different fractions of coal flyash. The morphology has been studied by SEM and it is found that it consists largerly of solid or hollow spherical particles of variable size with small bulging of siliceous and aluminous glass with the appearance of cracking at the tip of bulges.</span> Page(s): 241-244 1995-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/29863 Title: <span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Role of zinc oxide in V₂O₅-K₂SO₄-ZnO-SiO₂ catalyst in vapour phase oxidation of toluene to benzaldehyde</span> Authors: Chatterjee, S K; Das, A; Ray, Subodh K Abstract: <span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Catalytic vapour phase oxidation of toluene to benzaldehyde has been studied to formulate optimal catalyst. V₂O₅-K₂SO₄ combination at 15:20 ratio on silica gel has been optimised. Method of preparation of support grade silica gel, specific for platforming the catalyst constituents for the controlled oxidation of toluene has been worked out. Incorporation of zinc oxide in the aforesaid combination confers the catalyst system improved activity, matching selectivity and adequate stability. The V₂O₅-K₂SO₄–SiO₂ system, provides a framework for the arrangement and strategic placement of Zn, hosted in prescribed manner so that their mutual electronic interaction can exhibit their desired catalytic function.</span> Page(s): 236-240 1995-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/29861 Title: <span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Effect of pellet pressing temperature on transport properties of amorphous CuO-Bi₂O₃ pellets</span> Authors: Motke, S G; Burghate, D K; Gawande, W J; Pakade, S V; Yawale, S P Abstract: <span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The results of transport properties of CuO-Bi₂O₃ pellets pressed at different temperatures are reported. The data of electrical properties such as dc-electrical conductivity, dielectric constant and activation energy are discussed. Similarities between CuO-Bi₂O₃pellets and oxide glasses are emphasized. New results of pellet pressing temperature are reported. The hopping conduction phenomenon in three sets of pellets is discussed. All the three pellets exhibited non-adiabatic electronic conduction. The results of dc-conductivity are discussed on the basis of growing of small crystallities in the pellets.</span> Page(s): 231-235 1995-10-01T00:00:00Z