نتایج جستجو برای: homogeneous co oligomerization of olefins

تعداد نتایج: 21201291  

2014
Soe Lwin Israel E. Wachs

The literature of olefin metathesis by heterogeneous supported catalysts, both industrial-type supported metal oxides (ReOx/Al2O3, ReOx/(SiO2−Al2O3), MoOx/SiO2, MoOx/Al2O3, MoOx/(SiO2−Al2O3), WOx/SiO2, and WOx/ (SiO2−Al2O3)) and supported organometallic complexes, is comprehensively reviewed. The focus of this Review is supported metal oxide catalysts, but the well-defined supported organometal...

2002
Ione M. Baibich Carla Kern

This reaction allows for new olefins to be synthesized and used as raw materials in polymers, perfumes, drugs and agrochemical industrial products, also serving as the starting point for more complex organic molecules. Catalytic systems are based mainly on the metals W, Mo, Re and Ru. The metal-alkylidenes synthesized by Schrock, [Mo(CHR)(NAr)(OR f ) 2 ], Grubbs, [Ru(CHR)(PCy 3 ) 2 Cl 2 ], Herr...

Journal: :iranian journal of pharmaceutical sciences 0
mortaza mozaffari physics department, isfahan university, isfahan, iran nanophysics research group, center for nanosciences and nanotechnology research, isfahan university, isfahan, iran behshid behdadfar physics department, isfahan university, isfahan, iran jamshid amighian physics department, isfahan university, isfahan, iran nanophysics research group, center for nanosciences and nanotechnology research, isfahan university, isfahan, iran

in this work, mn ferrite nanopowders were prepared by co-precipitation method and were characterized. phase identification of the nanopowders was performed by x-ray diffraction method and the mean particle size of the nanopowders was calculated by scherrer's formula, using necessary corrections. magnetic parameters of the prepared nanopowders were measured by a vibrating sample magnetomete...

Journal: :journal of nanostructures 2013
a. nemati kharat r. zafari

current article describes application of zeolites in fluid catalytic cracking (fcc). the use of several zeolitic additives for the production light olefins and reduction of pollutants is described. application of zeolites as fluid catalytic cracking (fcc) catalysts and additives due to the presence of active acid sites in the zeolite framework  increase the formation of desired cracking product...

Journal: Nanochemistry Research 2017

In this study, a new recoverable catalyst for the epoxidation of olefins was developed using a layered polysiloxane as a support for immobilizing  (salen) molybdenum(VI) complex by electrostatic interaction between the surface of the solid support and the electrically charged molybdenum complex. Characterization of the heterogeneous catalyst by Fourier transform infrared, XRD,1H NMR,...

In this research, modeling, simulation, and control of a methanol-to-olefins laboratory fixed-bed reactor with electrical resistance furnace have been investigated in both steady-state and dynamic conditions. The reactor was modeled as a one-dimensional pseudo-homogeneous system. Then, the reactor was simulated at steady-state conditions and the effect of different parameters including...

Journal: :Resources Conservation and Recycling 2022

• GHG footprints of plastic waste chemical recycling to olefins are quantified. benefits quantified relative incumbent incineration with energy recovery. Chemical provides in the order 0.82 kg CO 2 -eq./kg waste. Future developments further increases from 2030. Dealing heterogeneous – i.e., high polymer heterogeneity, additives, and contaminants lowering greenhouse gas (GHG) emissions productio...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Zhi-Yong Yang Vivian R Moure Dennis R Dean Lance C Seefeldt

A doubly substituted form of the nitrogenase MoFe protein (α-70(Val)(→Ala), α-195(His→Gln)) has the capacity to catalyze the reduction of carbon dioxide (CO(2)) to yield methane (CH(4)). Under optimized conditions, 1 nmol of the substituted MoFe protein catalyzes the formation of 21 nmol of CH(4) within 20 min. The catalytic rate depends on the partial pressure of CO(2) (or concentration of HCO...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید