Naphthalene Gas Phase Catalytic Oxidation Of Naphthoquinone Catalyst Research

1,4-naphthoquinone is an important organic product. Conventionally chemical synthesis of 1,4-naphthoquinone and Electro-oxidation, have the weaknesses such as heavy pollution and complex technological process. Product for 1,4-naphthoquinone by air-catalytic oxidation from naphthalene can overcome these defects. The cost of 1,4-naphthoquinone by air-catalytic oxidation from naphthalene is low; The product of the process is mainly 1,4-naphthoquinone, the by-product is easy to separate from 1,4-naphthoquinone. This process is a green chemical technology of widely industrial application and has high value of economics, technology and environmental preservation. The paper have studied the catalysts for 1,4-naphthoquinone by air-catalytic oxidation from naphthalene and introduces the case of foreign preparation of 1,4-naphthoquinone and the method of air-catalytic oxidation of naphthalene; It discusses the necessity and significance of studying the synthetic method of 1, 4-naphthoquinone in our county.This paper mainly introduces the catalysts of preparation of 1, 4-naphthoquinone by method of gas-phase catalytic oxidation. The V-K coared catalysts for the production of naphthoquinone was studied ;The influence of co-catalysts the oxides of Ag Mn Fe Sn Pb Ce and Cu, on properties of catalysts were studied. The results show the catalysts of used oxides of Ag Pb Sn as co-catalysts have better activity and high selectivity, The selectivity and activity are separately up to 69% and 26%.Firstly, the experiment have been done to select the active component of the catalysts for 1,4-naphthoquinone by air-catalytic oxidation from naphthalene. To observe and study the activity of the catalysts the experiment have been done to select the active component. Through the experiment, the conclusion have been drew that the first-class active matter is V2O5.Secondly, through discussing effects of co- catalysts, the Pb(NO3)2 SnSO4FeSpFe2(SO4)3 are favorable catalysts to prepare 1,4-naphthoquinone. They can upraise the catalyst-selectivity. Through discussing effects ofeach-other, the catalyst have been optimized.Thirdly, through discussing effects of all kinds of factors on stability co-catalysts, have examed K2SO4 and K2S2O7. It was found that the mixture of K2SO4 and K2S2O7 is better than one of them. The specific value in quantity has an optimum value, the optimum value is 2:1. Under the condition ,catalyst has high activity and selectivity.This paper has studied carriers of catalysts for preparation of 1,4-naphthoquinone from naphthalene oxidation and discusses the influence of several staple different carriers. To observe and study specific surface area of the catalysts ,the salic mineral treated earth and special disposal stuffs are been studied in detail. It was found that special disposal stuffs were suitable carriers for the production of naphthoquinone by method of air-catalyticoxidation.Based on the selection of carriers, this paper relates to a process for the production of catalysts and relates more particularly the influence of the different pressure in extrusion-moulding process and the different temperature in calcined process on the activity of catalysts. Results show that the optimal condition for the production of naphthaquinone is that the pelleting pressure is in the range of from 6.5Mpa, to 7.5Mpa, and the temperature is 723K.the temperature and concentration of the reaction for preparation of 1,4-naphthoquinone from naphthalene oxidation had numerous influence to the activity and selectivity of catalyst. High activity needs high temperature, but under high temperature , the selectivity is low . High selectivity needs low temperature, but under low temperature, the activity is low.