نتایج جستجو برای: methanol dehydration

تعداد نتایج: 44844  

پایان نامه :0 1371

در پروژه حاضر داده های تعادلی فشار بخار برحسب کسر مولی مایع برای سیستم های methanol()methyl tert - buthyl ether/ در درجه حرارت های 25،35،45درجه سانتیگراد و سیستم) diisopropyl ether/methanol(در دمای 30 درجه سانتیگراد اندازه گیری شده است . برای اندازه گیری از دستگاهی شبیه به دستگاه gibbs vanness که به روش استاتیکی کار می کند استفاده شده است . تمام سیستمهای اندازه گیری شده انحراف مثبت از قانون رائ...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2008
Kunihiko Seno Kazuki Matumura Mitsuko Oshima Shoji Motomizu

1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC.HCl) is a very useful agent to form amide bonds (peptide bonds) in an aqueous medium. A simple and fast detection system was developed using the reaction with pyridine and ethylenediamine in acidic aqueous solution and spectrophotometric flow injection analysis. The absorbances were measured at 400 nm and the reaction was accelera...

Journal: :ACS applied materials & interfaces 2011
Zhihui Jiao Jinmin Wang Lin Ke Xiao Wei Sun Hilmi Volkan Demir

Tungsten trioxide hydrate (3WO(3)·H(2)O) films with different morphologies were directly grown on fluorine doped tin oxide (FTO) substrate via a facile crystal-seed-assisted hydrothermal method. Scanning electron microscopy (SEM) analysis showed that 3WO(3)·H(2)O thin films composed of platelike, wedgelike, and sheetlike nanostructures could be selectively synthesized by adding Na(2)SO(4), (NH(...

2017
Junfeng Feng Zhongzhi Yang Chung-yun Hse Qiuli Su Kui Wang Jianchun Jiang Junming Xu

The renewable phenolic compounds produced by directional liquefaction of biomass are a mixture of complete fragments decomposed from native lignin. These compounds are unstable and difficult to use directly as biofuel. Here, we report an efficient in situ catalytic hydrogenation method that can convert phenolic compounds into saturated cyclohexanes. The process has high potential for production...

Journal: :Microporous and Mesoporous Materials 2023

Nanosized ZSM-5 (<100 nm) zeolites with high acidity (Si/Al < 15) can bring distinct advantages as catalysts for obtaining aromatics in C1 chemistry. Synthesis of such nanosized a cheap and scalable manner remains challenge. Herein, (20–50 = 11) was hydrothermally synthesized yield using p-phenylenedimethylene-bis(tripropylammonium) dichloride (Pr3N-benzyl-NPr3) the sole organic structure-direc...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2011
Fumihiko Tanaka Tsuyoshi Koga Isamu Kaneda Françoise M Winnik

The collapse of a poly(N-isopropylacrylamide) (PNIPAM) chain upon heating and the phase diagrams of aqueous PNIPAM solutions with a very flat lower critical solution temperature (LCST) phase separation line are theoretically studied on the basis of cooperative dehydration (simultaneous dissociation of bound water molecules in a group of correlated sequence), and compared with the experimental o...

2011
Julie E. Molinari Lingaiah Nakka Taejin Kim Israel E. Wachs

Molybdenum-based Keggin polyoxometalates (POMs) containing vanadium, with the formula H3+xPMo12 xVxO40 (MPAV) and x varying from0 to 3, exhibit unique catalytic properties because of their bifunctional nature and have been investigated as catalysts both for acidic and for oxidative reactions. 3 The addition of vanadium centers are beneficial for redox catalysis, shifting the molybdophosphoric a...

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