in our current study, supercritical water impregnation (scwi) was introduced as a unique catalyst preparation method by employing the high diffusivity property of supercritical water. the method allows nano-particles to place on support surfaces in extremely dispersed conditions. the silica-based nanocatalyst granules for this purpose were prepared by initial impregnation of highly porous silic...

bis(2-r-ind)zrcl2 (r: h or phenyl) was supported on different types of silica by in situ impregnation method and used for ethylene polymerization. in this method, the step of catalyst loading on support was eliminated and common alkyl aluminum (triisobutylaluminum, tiba) cocatalyst was used instead of expensive methyl aluminiumoxane (mao) cocatalyst in the polymerization. the effect of surface ...

The preparation step of a catalyst is primary importance as it may govern its performance. We report here the first direct multi-elemental imaging an alumina-supported during maturation process. Alumina extrudate support was impregnated with nickel nitrate solution in presence citric acid organic additive. Wet extrudates were sampled, cut half and imaged by Laser-Induced Breakdown Spectroscopy ...

In this work, several copper supported catalysts, Cu/Dol, Cu/Al2O3, Cu/Bent, Cu/Mont, and Cu/Talc were prepared using wet impregnation route characterized BET, BJH, XRD, H2-TPR, NH3–TPD, SEM analytical techniques subsequently tested in hydrogenolysis of glycerol to 1,2-propanediol (1,2-PDO). The nature support was found determine the activation catalysts. Among dolomite catalyst (Cu/Dol) exhibi...

Study of dendritic morphology through Golgi impregnation techniques has significantly furthered our understanding of neuronal development, maturation, and senescence. It has also provided insight into the pathogenesis of a wide spectrum of disease processes ranging from brain malformations to degenerative disorders. Golgi impregnation remains virtually the only method for demonstrating dendriti...

The present paper shows through conventional light microscopy, silver nitrate impregnation and Transmission Electron Microscopy, the changes in nuclear activity that occurs in the ovary cells during vitellogenesis of Apis mellifera (Linnaeus, 1758). The material impregnated by silver nitrate was detected in nurse cells, oocyte germinal vesicle and follicular cells, whose amounts are greater in ...

• Ultrasound-assisted ultra-wet (US-UWet) impregnation synthetic method is presented. Mixed cupric and cuprous oxides nanoclusters (< 4 nm) were decorated on TiO 2 P25. The nanocomposite showed H formation capability under low power UV irradiation. additive free oxidation of biomass derived model platform chemicals was studied. Nanocomposite revealed higher selectivity comparing to P25 for HMF ...

A pulp yield increase up to 2% can be achieved by impregnation with a liquor containing 2 M effective alkali (EA) concentration instead of 1 M. The yield increase is due to higher cellulose and glucomannan contents in the pulp, which can be rationalized by less yield loss by peeling, as impregnation is more effective at an elevated EA level. A rapid loading of chips with alkali can be realized...

A technique is described which combines silver impregnation and ultrathin sectioning for the electron microscopic demonstration of fibrils in the connective tissue of the chick embryo. The electron micrographs presented in this paper provide evidence for the specificity and completeness of the silver-impregnation technique. It has been shown that, in this particular tissue after fixation in neu...