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1,4-Dimethoxybenzene(cas 150-78-7): Peony flowers volatile component

Date : 2016/8/19 11:24:29

By headspace - solid phase micro extraction (HS-SPME) method to capture the enrichment means, using gas chromatography - mass spectrometry (GC-MS) techniques peony flower volatile components to analysis. From The Dongfanghong, Lotus Talkin, Bingqing and pink jade mounted varieties of fresh peony flower volatile components isolated and identified 15 kinds of ingredients. Peony flowers of different volatile chemical composition of different characteristics, in which the main component of Dongfanghong and Lotus Talkin are geraniol, each accounting for 37.19% and 84.60% respectively of all components; Prostitute main components of citronellol, accounting 56.06% of all components; Bingqing mainly composed of 1,4-dimethoxybenzene(cas 150-78-7), accounting for 61.26% of all the ingredients; jade powder as a main component means phenylethanol, accounting for 67.01% of all the ingredients.

Because of the special physical and chemical properties of manganese oxide,  it is an important transition metal oxide materials. Manganese dioxide is widely used in the field of catalytic materials, electrochemical, ion exchange and molecular adsorption. Manganese dioxide nanoparticles have a large surface area and good low temperature performance reduction to toluene catalytic combustion reaction showed good catalytic activity. In the preparation process, it will affect the calcination temperature of the catalyst phase, crystallinity, surface area, etc., thus affecting the catalytic activity. Thus, the catalytic properties of different calcination temperatures produced manganese dioxide catalyst has important academic significance. Among transition metal oxide, cobalt oxide is an important functional material with stable physical and chemical properties and unique magnetic properties, so in the field of catalytic materials, electrochemistry, gas sensors and other magnetic material and has a wide range of applications. So far, various morphologies tetroxide three cobalt have been synthesized, such as nanoparticles, nanorods / nanowires / nano band / nanotubes, cube, nanospheres, films, sea urchin-like and so on. Morphology of the products have a great impact on their relative performance, the study catalytic properties of different morphologies tetroxide three cobalt has important application value. 

The main contents of this paper are as follows: 1 potassium permanganate and fumaric acid synthesized manganese dioxide catalyst using a sol-gel method, and examine the catalyst calcination temperature on the properties of the catalytic combustion of toluene . Experimental results show that the calcination temperature was 450 ℃ manganese dioxide catalyst prepared (labeled 450-Mn02) pure tetragonal phase α-MnO2 nanoparticles, with the increase of calcination temperature, Mn2O3 impurity phase gradually formed nanoparticles size increases, the specific surface area is getting smaller and smaller, low temperature reduction performance decreased activity of the catalyst is getting worse. In toluene at a concentration of 4 g / m3, a space velocity of 20000 h-1 reaction conditions, the catalytic combustion of toluene each catalyst showed good catalytic activity. 450-MnO2 catalyst having a large specific surface area and low temperature hydrogen reduction, uniform, granular morphology, it has good performance toluene catalytic combustion, incomplete combustion temperature of 206 ℃, the conversion of toluene within 48h rates were maintained at above 95%, showing good stability. 2. Drill cobalt nitrate source, urea as a precipitating agent, polyethylene glycol 600 (PEG 600), 400 (PEG 400) and an aqueous solution of polyethylene glycol, ethylene glycol (EG) as the reaction solvent, the solvent thermal method Preparation of different morphologies of Co (CO3) 0.5 (OH) · 0.11H2O precursor can be obtained after firing oxide cobalt catalyst and examine the different morphology of the catalyst for the  properties of 1,4-dimethoxybenzene(cas 150-78-7). The experimental results showed that PEG 600, PEG 400 and EG as the reaction solvent, were obtained urchin-like C0304, C0304 rod and line C0304, each morphology C03O4 are pure cubic spinel structure, specific surface area of 69.43 respectively m2 / g, 55.87 m2 / g and 76.78m2 / g. In the n (DME): n (Oxygen): n (helium) = 1:10: 40, a space velocity of 30000 h-1 the reaction conditions, and different morphologies of Co3O4 catalysts exhibit catalytic combustion DME excellent catalytic activity, wherein the linear Co3O4 catalyst due to the large specific surface area and having a lower hydrogen reduction temperature, thus showing the optimal DME catalytic combustion performance, space velocity of 30000h-1 when T10 and T90 (corresponding to the reaction temperature of the DME conversion was 10% and 90% of the time) were 141 ℃ and 152 ℃.