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Catalysts of aluminum dihydrogen tripolyphosphate supported by activated carbon ((ATP-AC) were prepared by using activated carbon oxidized by Na2S2O8, H2O2 and HNO3, respectively, and characterized by Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). The orthogonal design experiment was used to obtain the best condition of the three kinds of catalysts. The results show that the three kinds of ATP-AC catalyst disply higher activity and selectivity. The optimal conditions are: for preparation conditions of catalyst ATP-AC-1: oxidant concentration c (Na2S2O8) = 0.75 mol/L, bonding temperature t = 603 K, mass ratio W% (ATP) = 60%; for catalyst ATP-AC-2: oxidant concentration c(H2O2) = 1.0 mol/L, bonding temperature t = 603 K mass ratio W% (ATP) = 60%; for catalyst ATP-AC-3: oxidant concentration (HNO3) = 0.5 mol/L, bonding temperature t = 603 K, mass ratio W% (ATP) = 60%. The yield of tributyl citrate is over 90%. Three kinds of oxidants increase the carbon-oxygen functional groups of activated carbon and improve its hydrophilicity. The pore structure of oxidated AC is more regular, and the quantity of microporous and larger pores is increased. All these changes promote the chemical bonding between activated carbon and ATP. [ABSTRACT FROM AUTHOR]

Potassium zinc phosphate was synthesized by solid-state reaction using K3PO4·3H2O and ZnSO4·7H2O as reagents. To investigate the influence of molar ratio, grinding time, holding temperature, holding time on yield and zinc content of the product, experimental project was designed by uniform design and data mining technology. Obtained product was characterized by X-ray diffraction, scanning electron microscope and energy disperses spectroscopy. The results show that the two mathematical models can be established by regression analysis according to yield and zinc content, which can be used to obtain the best technology conditions of solid-state reaction. Under the optimum reaction conditions: molar ratio of K3PO4·3H2O: ZnSO4·7H2O = 1.01, grinding time 31min, holding temperature 750°C, holding time 3.2 h, the prepared product is KZnPO4with nano-lamellar structure, and the reaction average yield value is 84.33% and zinc content is 31.29%. [ABSTRACT FROM AUTHOR]