نتایج جستجو برای: calcium hydride
تعداد نتایج: 172346 فیلتر نتایج به سال:
General experimental details. All organometallic and catalytic procedures were carried out under an inert atmosphere of argon by using a dual manifold vacuum/argon line and standard schlenk techniques, or in an MBraun glove box. All solvents were predried by refluxing for three days under dinitrogen over the appropriate drying agents (sodium for toluene; potassium for THF; sodium-potassium allo...
La2-xNdxCuO3.5 (x ? 0.5) compounds have been synthesized by a topotactic reduction reaction with calcium hydride at 280 °C for 48 h. Structural, thermal, vibrational and magnetic properties of were studied X-ray powder diffraction (XRD), differential thermal analysis (DTA) temperature dependent X ray (TDXD), Raman spectroscopy electronic paramagnetic resonance. The oxidation the 400 24 h kineti...
در این پژوهش اثر افزودن کاتالیست و آسیاب کاری بر خواص واجذب هیدروژن هیدرید منیزیم مورد بررسی قرار گرفته است. نانو کامپوزیت های mgh2-7%v-3%al و mgh2-5%v-5%alبه روش آسیاب کاری مکانیکی ساخته شدند. اثر زمان آسیاب کاری (5، 20 و 40 ساعت) بر ساختار و خواص هیدروژنی هیدرید منیزیم توسط آنالیزهای حرارتی افتراقی (sta)، تفرق پرتو ایکس (xrd) و میکروسکوپ الکترونی روبشی (sem) مورد مطالعه قرار گرفت. نتایج آنالی...
In this research, DTA and TGA curves of titanium hydride powder in air with the heating rates of 5, 10, 20, 25, 30ºC/min were drawn, and XRD patterns of titanium hydride powder during heating rate 10ºC/min were prepared. Results showed that hydrogen comes out of titanium hydride in air during seven stages. And, by increasing heating rate, the mechanism of hydrogen emission from titanium hydride...
A classical but new kinetic equation to estimate activation energies of various hydride transfer reactions was developed according to transition state theory using the Morse-type free energy curves of hydride donors to release a hydride anion and hydride acceptors to capture a hydride anion and by which the activation energies of 187 typical hydride self-exchange reactions and more than thirty ...
Excitation of the weak electron donor decamethylosmocene on illumination with white light produces an excited-state species capable of reducing organically solubilized protons under biphasic conditions. Insight into the mechanism and kinetics of light-driven biphasic hydrogen evolution are obtained by analysis with gas chromatography, cyclic voltammetry, and UV/Vis and (1)H NMR spectroscopy. Fo...
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