Development And Reseach Of The New Catalyst Of Attapulgite Clay

Attapulgite is one kind of natural clay mineral,which is hydrated magnesium aluminum silicate with a layer-chain structure (attapulgite).Owing to its properties,such as special crystal structure and superficial character, attapulgite possesses fine adsorptive, catalytic, rheologic, heat resistance capabilities.Its product widely applies to industry and so on petroleum, chemicalindustry, building materials, papermaking, medicine, farming andanimal husbandry, atomic energy, solar energy, food and silicate.Based on lots of comprehensive analysis of the attapulgite literatures, using the attapulgite as the carrier synthesize the catalyst of fructone, and using Gansu attapulgite clay, for the first time , as raw materials successfully synthesizes the 4A Zeolite. The experiment obtains the following conclusion:(1)By using acid-treated attapulgite clay as supporters, attapulgite clay supported phosphotungstic acid catalyst were prepared through impregnation method, and characterized by XRD, IR and UV spectrophotometry. Such catalysts will be used as the catalyst for synthesis of fructone. Influence of molar ratio of ethyl acetoacetate to glycol, the amount of catalyst, the amount of water-carry reagent, the reaction time, the reaction temperature on the esterification was investigated. The experimental results indicated that attapulgite clay supported phosphotungstic acid catalyst had good catalytic activity, structural stability, can be reused. The optimum conditions are: molar ratio of ethyl acetoacetate to glycol is 1:1.5, the amount of catalyst is 2g, the amount of benzene which is water-carry reagent is 50mL, the reaction time is 3h, the reaction temperature is 110℃, and its yield can reach over 89.7%.(2) Attapulgite clay has iron impurities, which greatly restricted the function. Using ultrasound hit, stirring, vibration effects, and oxalic- acid and titanium-chloride joint-bleaching technology, we remove iron and bleach the attapulgite clay, The results showed that this method is effective, and after iron-removing and bleaching attapulgite clay reflectivity can reach 56.1% and the whiteness index can reach 71.1%.(3) Using this attapulgite clay to synthesize Zeolite as material, and tested by IR ,XRD and SEM,we find that attapulgite clay after iron-removing and bleaching can produced Zeolite. Acheap, pollution-free new materials is provided for the synthesis of Zeolite. Using attapulgite for synthesis of zeolite not only has developed the attapulgite application domain, more over, attapulgite minerals in development and application has the positive significance to our country, especially the western.