23 research outputs found
Coexistence of Two Kinds of Fluorinated Hydrogenated Micelles as Building Blocks for the Design of Bimodal Mesoporous Silica with Two Ordered Mesopore Networks
Full text link<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:"Times New Roman";mso-ansi-language:EN-US; mso-fareast-language:EN-US;mso-bidi-language:AR-SA">A comparative study of LaCoO<sub>3</sub> prepared by various wet chemical methods</span>
No full text229-236<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:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">A comparative study off our
different methods of preparation of LaCoO3 by precipitation as
oxalates, carbonates, citrates and hydroxides of La and Co followed by calcination
at different temperatures to form LaCoO3 is presented. The extent of
formation of the LaCoO3 phase from the precursors as a function of temperature
is systematically followed using XRD, TG-DTA, and FT-IR techniques. Higher
surface area (20 m2/g) samples of LaCoO3 with no oxide
impurities and with smaller particle size are formed from the citrate complex
and the mixed hydroxides on calcination at 873 K. These are found to be more
active in the oxidation of C2-C4 hydrocarbons at 573 K
than the samples prepared from other mixed precipitates or by the ceramic
route.</span
Low temperature stabilization of zirconia by Mn through Co-precipitated hydroxide gel route
No full textEffect of surface modification due to superacid species in controlling the sensitivity and selectivity of SnO<SUB>2</SUB> gas sensors
No full textThe sensitivity and selectivity of SnO2 gas sensors are found to be affected by the presence of sulphate species on the surface due to the formation of superacidic sites. The potential advantages of this new method of selectivity control of SnO2 gas sensors are described with respect to the sensing of carbon monoxide, ammonia, ethanol, acetone and LPG. Although an increase in sensitivity is observed in the range 3-60 ppm for a few of these gases, these modified materials show a slow loss of activity upon exposure to humidity. The evidence obtained from instrumental techniques such as XRD, TG-DTA, SEM, IR and TDS indicate that these superacid species exert considerable influence on the sensitivity by modulating the adsorption characteristics along with microstructural changes
Synthesis, spectral characterization and biological evaluation of novel 1-(2-(4,5-dimethyl-2-phenyl-1H-imidazol-1-yl)ethyl)piperazine derivatives
No full textLow temperature complete combustion of dilute propane over Mn-doped ZrO2 (cubic) catalysts
No full textLow-Temperature Selective Catalytic Reduction (SCR) of NOx with n-Octane Using Solvent-Free Mechanochemically Prepared Ag/Al2O3 Catalysts
No full textNOx abatement in the exhaust of lean-burn natural gas engines over Ag-supported γ-Al2O3 catalysts
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