Mg 3 (VO 4 ) Mg3 VO BET XRD SEM. Noyori 20 ~ 40. Micromeritics ASAP Pa 6 h. Rigaku D/MAX 2550 X. Vol.39 No.4 Dec.

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1 ( ) J. Jianghan Univ. (Nat. Sci. Ed.) Vol.39 No.4 Dec Mg 3 (VO 4 ) 2 * Mg 3 VO ph C 6 h Mg 3 VO nm mol/h 6. 4% Mg3 VO4 2 O643.3 A Noyori Mg3 VO Mg3 VO Mg3 VO Mg3 VO4 2 BET XRD SEM Mg3 VO4 2 Mg NO 3 2 6H 2O NH 4VO 3 Mg V ph 1 h h h 6h0.5 /min 20 ~ 40 Mg3 VO Micromeritics ASAP Pa 6 h BET XRD Rigaku D/MAX 2550 X (1973 ) * (1971 ) guoxianyu828@yahoo.com.cn

2 24 39 JCPDS-ICDD SEM Philips XL kv mm400 mm 500 mg 1 4 ± mm ml/min 60 min ml/min 0. 2 ml/min 1. 5 h ± 3 % PEG HP ph ph 15 1 Mg 2+ ph ~ C6H6O7 2 ph 10 3 mol/l 16 ph V10O28 6 x x OH x H2VO4 8 4 VOx n n ph 9.0 V 5 5O 15 4 V4O12 V3O9 3 8 M.Tsaramyrsi 17 ph 4. 0 NH4 + NH4 2 VO2 C6H6O ph Mg 3 VO 4 2 ph ph 4.8 ph Mg 3 VO 4 2 ph / % / % / % 2 C 6H 8O C 6H 7O C 6H 6O C 6H 5O h R Mg3 VO SEM 1 (a) Mg3 VO4 2 V2O5 MgO (b) 1 (c) 18 2 Mg 3 VO 4 2

3 Mg 3 (VO 4 ) 2 25 (a) (b) (c) h (a) 2 1 (b) (c) Mg 3 VO R 1. 2 Mg3 VO4 2 2 Mg 3 VO 4 2 R / nm / % / % / % Mg3 VO4 2 XRD 500 Mg 3 VO 4 2 XRD Mg3 VO / 3 Mg 3 VO / 6 h a. 500 b. 550 c. 600 d / m 2 g 1 / % / % / % Mg 3 VO 4 2 XRD 2.4 Mg 3 VO 4 2 XRD 3 4 h 8 h 4

4 / h Mg 3 VO 4 2 / % /% /% , Mg3 VO ph h 110 nm Mg3 VO mol/h 15. 5% 41. 5% 6. 4% / h, (2) 5 h, (3) 6 h, (4) 7 h 5 8 h. 3 Mg 3 VO 4 2 XRD [1] Schuchardt U, Cardoso D, Sercheli R,et al. Cyclohexane oxidation continues to be a challenge [J]. Appl Catal A: General, 2001, 211(1): [2] Liu S C, Liu Z Y, Wang Z, et al. Characterization and study on performance of the Ru-La-B/ZrO 2 amorphous alloy catalysts for benzene selective hydrogenation to cyclohexene under pilot conditions[j]. Chem Eng J, 2008, 139(1): [3] Rias M, Mikhail S. Dehydrogenation of cyclohexane over molybdenum mixed oxide catalysts[j]. Catal Comm, 2008, 9(6): [4] Jin M, Cheng Z M, Gao Y L, et al, Oxidative dehydrogenation of cyclohexane with Mg 3 (VO 4 2 synthesized by the citrate process [J]. Mater Lett, 2009, 63(23): [5] Elomestnykh I P, Isaguliants G V. V-Mg-O catalysts for oxidative dehydrogenation of alkylpyridines and alkythiophenes[j]. Catal Today, 2009, 142(3/4): [6] Mishakov I V, Vedyagin A A, Bedilo A F, et al. Aerogel VOx/MgO catalysts for oxidative dehydrogenation of propane[j]. Catalysis Today, 2009, 144(3/4): [7] Balderas-Tapia L, Hernández-Pérez I, Schacht P, et al. Influence of reducibility of vanadium-magnesium mixed oxides on the oxidative dehydrogenation of propane[j]. Catal Today, 2005, 107/108: [8],,,. V-Mg-O [J]., 2001, 15(3): [9] Klisi ska A, Loridant S, Grzybowska B et al. Effect of additives on properties of V 2O 5/SiO 2 and V 2O 5/MgO catalysts II. Structure and physicochemical properties of the catalysts and their correlations with oxidative dehydrogenation of propane and ethane [J]. Appl Catal A: General, 2006, 309: [10] Blanco S, Garrazan S R G, Rives V. Oxidative dehydrogenation of propane on Mg-V-Al mixed oxides [J]. Appl Catal A:General, 2008, 342(1/2): [11] Chaar M A, Patel D, Kung M C, et al. Selective oxidative dehydrogenation of butane over V-Mg-O catalysts [J]. J Catal 1987, 105: [12] Gao X T, Ruiz P, Xin Q, et al. Effect of coexistence of magnesium vanadate phases in the selective oxidation of propane to propene [J]. J Catal, 1994, 148(1): [13] Gao X T, Ruiz P, Xin Q. Preparation and characterization of three pure magnesium vanadate phases catalysts for selective oxidation of propane to propene[j]. Catal Lett, 1994, 23: [14] Jin M, Cheng Z M. Oxidative dehydrogenation of cyclohexane to cyclohexene over Mg-V-O catalysts [J]. Catal Lett, 2009, 131(1/2): [15]. Mg-V-O [D].,2010. [16] Blangenois N, Florea M, Grange P. Influence of the co-precipitation ph on the physico-chemical and catalytic properties of vanadium aluminum oxide catalyst [J]. Appl Catal A: General, 2004, 263: [17] Tsaramyrsi M, Kavousanaki D, Raptopoulou C P. Systematic synthesis, structural characterization, and reactivity studies of vanadium(v) citrate anions VO 2 C 6H 6O 7 22 isolated from aqueous solutions in the presence of different cations [J]. Inorg Chim Acta, 2001, 320: [18],,. - NiO/Ce 0.8 Gd 0.2 O 1.9 [J]. :, 2006, 36(B03):

5 Mg 3 (VO 4 ) 2 27 Oxidative Dehydrogenation of Cyclohexane with Mg 3 VO 4 2 Prepared by Citric Acid Method JIN Mei, XU Zhi, LIU Zhi-min, LU Ping, YU Guo-xian (School of Chemistry and Environmental Engineering, Jianghan University, Wuhan , Hubei, China) Abstract Citric acid method was proposed to prepare Mg 3 VO 4 2 which was used as an active catalyst forthe oxidativedehydrogenation ofcyclohexane to cyclohexene. Effects of the preparation conditions were investigated in details. The experimental results showed that Mg 3 VO 4 2 catalyst calcined at 550 for 6 h with a molar ratio of citric acid metal ion = and initial ph = 4.8, exhibited the best catalyticperformance with an excellent thermal stability. The yield of cyclohexene was 6.4% under the temperature of 450 C, the molar ratio of cyclohexane to oxygen of 2 1 and the flow of cyclohexane of mol/h. Key words: citric acid method; Mg 3 VO 4 2; cyclohexane; oxidative dehydrogenation reaction 22 Study on Composite Flame Retardant Rubber Sheet from SBR / Microwave Activation Crumb Rubber HU Si-qian, YU Guo-xian, ZOU Xin (School of Chemistry and Environmental Engineering, Jianghan University, Wuhan , Hubei, China) Abstract Used crumb rubber with microwave activation treatment, styrene-butadiene rubber (SBR), additives and flameretardants to makemixed glue, then theflame retardant rubber products weremade by sulfuration on hot press machine. The products' mechanical performance, differential thermal analysis, the oxygen index determination, horizontal combustibility determination were discussed. Experimental results showed that as the mass ratio of activated powder / SBR / composite flame retardant / additives is , the limited oxygen index (LOI) of flame retardant rubber product reached 24%, horizontal flame performanceachieved to GB standard, tensile strength reached 3.44 MPa, the comprehensive indices were better. Key words: microwave activation crumb rubber SBR flame retardant; mechanical property limited oxygen index