The process of producing diesel-like fuel from combination of catalytic cracking with catalytic esterification was studied. The optimal technological conditions were obtained as follows: CaO as cracking catalyst, distillation temperature 320 -350 C, cracking temperature 480 -500 C, adding rate of waste oil feedstock 35 g/h, and sodium bisulfate as esterification catalyst with the amount 3 wt. % of pyrolytic product, and molar ratio 0.4 (methanol to pyrolytic product). Results of Fourier transform infrared spectroscopy (FTIR) indicated that the fraction distribution of product was modified by catalytic cracking process, and gas chromatography-mass spectrometry (GC-MS) analysis showed the esterification products consist of alkanes, alkenes, aldehyde, and fatty acid methyl ester of short chains below C 16 . And the acid value of pyrolytic product from the esterification process decreased remarkably from 40 mg KOH/g to 1.6 mg KOH/g. The properties of the final fuel product were measured as follows: density of 850 kg/m 3 , viscosity of 3.05 mm 2 /s, freezing point of À9 C, and cold filter plugging point of À4 C, indicating that the fraction distribution, properties, and applicability of the product from combination process were also further improved. V C 2013 AIP Publishing LLC. [http://dx.

The preparation of biodiesel from Styrax Tonkinensis catalyzed by solid acid S2O82-/ZrO2-TiO2-Fe3O4 at an autoclave was studied in this paper. The magnetic catalysts were characterized by XRD, which explained the high catalytic effect. At the same time, the recovery rate and usage count of catalysts were also studied. And the results showed that a high yield of transesterification can be obtained in a closed autoclave at the condition of catalyst amount 5 %, reaction time 1.5 h, reaction temperature 373K and methanol and oil molar ratio 10:1. The results also showed that the catalysts were still with a higher catalytic efficiency when the catalysts were calcinated after the forth usage.

Styrax confusus Hemsl., a promising energy plant, was used as raw material for biodiesel preparation in this paper. The transesterification was catalyzed by magnetic catalyst S2O82--ZrO2/Fe3O4, prepared by chemical co-precipitation method. TEM images indicat that the average particle diameter of magnetic core Fe3O4 and catalyst carrier ZrO2/Fe3O4 are 5-20 nm and 30-50 nm respectively. Because of its unique porous structure the BET surface area could up to 140.75 m2/g. The results show that a best catalytic activity is obtained when the solid catalyst impregnated in 2.5 mol·L-1 (NH4)2S2O8, calcined at 400 °C for 3 h, and a high methyl ester yield could be obtained under the optimal reaction conditions of catalyst amount 4.5 % (wt/wt oil), molar ratio of methanol/oil 6:1, reaction temperature 65 °C and time 2.0 h.