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1. Preparation of Catalyst

The catalyst prepared using conventional impregnation method with an appropriate amount of aqueous ammonium metatungstate solution impregnation silicon dioxide carrier (specific surface area of 538m2 / g), and then dried at 363K 6h, then in air at different temperatures, respectively (533,573,623 and 773K) calcined 3h. tungsten loadings (mass fraction) were 7.9%.

2. Catalyst Characterization

XRD analysis of the catalyst in the Japanese RigakuD / Max-RA type rotating anode X-ray diffractometer, CuKα target, 40kV, 150mA.TPD completion of the experiment on a homemade device to NH3 and CO2 as a probe molecule would 100mg sample was charged in a quartz tube in an Ar gas flow (30ml / min) at a rate of 10K / min raised to a predetermined temperature, the system continues to purge 60min. adsorption at 373K NH3 (or CO2) 30min later, in an Ar gas flow purge 120 min, then He gas flow (30ml / min) at a rate of 10K / min be desorbed by using TCD detector and recorder records pyridine adsorption - desorption infrared spectroscopy (Py-IR) test in the United States NicoletIm- Completing the pact410 infrared spectrometer, the sample is pressed into a self-supporting sheet placed in situ infrared cell, up to a certain temperature vacuum (0 · 01 Pa) treatment of the sample to room temperature after pyridine adsorption, infrared spectra recorded at room temperature. catalyst surface morphology in Japan JEOLJSM-6700F scanning electron microscope. TG-DTA analysis of the samples in the Japanese ShimadzuDTG-60 thermal analyzer, in air atmosphere from room temperature to 1073K, heating rate of 10K / min .

3. Evaluation of catalyst activity

Catechol with methanol monoetherification reaction activity evaluation conducted in a fixed bed continuous flow reactor apparatus. The reaction tube hard glass tube (diameter 1 · 1cm, length 40cm), catalyst (40 to 60 mesh) the amount of 1 · 4g. prior to the reaction with N2 purged through the reaction system, the raw material into the system with a micro pump, after preheating section into the catalyst bed layer gasification, the product is condensed into a collector flask. using Japan Shimadzu GC-8A gas chromatograph instrument product was analyzed using HP-5 capillary column, FID detector, N2 as a carrier gas.


 

 

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