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catalyst
A new environmentally friendly catalyst, H4SiW12O40-polyaniline (PAn), was prepared, and n-butyraldehyde 1,2-propanediol acetal was synthesized from n-butyraldehyde and 1,2-propanediol in the presence of H4SiW12O40-PAn.
      
The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h.
      
H4SiW12O40-PAn is an excellent catalyst for synthesizing n-butyraldehyde 1,2-propanediol acetal, and the yield can reach more than 95.2%.
      
The partial intermediate products were absorbed on TiO2 surface, which resulted in catalyst deactivation.
      
But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
      
Liquid-Phase Hydrogenation of Chloronitrobenzene Over Pt-Sn-B Amorphous Catalyst Supported by Carbon Nanotubes
      
The Pt-Sn-B/carbon nanotubes (CNTs) catalyst was prepared by impregnation-chemical reduction method.
      
The results showed that the catalyst had higher catalytic performance than common hydrogenation catalysts.
      
Transmission electron micrograph image showed that the catalyst particles were highly distributed on the surface of CNTs.
      
The relationship between the interaction of CNTs and amorphous metals and the catalytic performance of the catalyst is also discussed.
      
The copolymerization of propylene with 1,4-divinylbenzene using an isospecific MgCl2-supported TiCl4 catalyst yielded polypropylenes containing pendant styrene moieties.
      
Reactions between the dendrimers and acid-processed silica gel took place, with toluene reflux and organic base as catalyst.
      
Catalyst with appropriate specific surface area and narrow pore size distribution was obtained.
      
The acetalization and ketalization of various aldehydes and ketones with catechol by using HY zeolite as catalyst were studied.
      
Effect of the reaction time, mole ratio of reactants, and amount of catalyst on the yield of benzodioxoles were investigated.
      
Results show that HY is an efficient catalyst for the acetalization and ketalization with high conversion and selectivity in mild conditions.
      
The best reaction conditions: molar ratio of catechol to aldehydes or ketones is 1:1.4, catalyst amount is 3.5 g/l mol catechol, reaction time is 5 h.
      
The influences of the polycondensation time, and the catalyst type on the intrinsic viscosity of P(CL-co-LA) were also investigated.
      
The conversion of C6H11OH reached 69.56% and the selectivity of C6H10 was 96% when the amount of catalyst, temperature range and reaction time were 6.59%, 170°C-180°C, 30 min, respectively.
      
A novel chlorine-doped titanium dioxide catalyst with visible light response was prepared by hydrolysis of tetrabutyl titanate in hydrochloric acid.
      
 

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