Keggin型磷钼钒杂多化合物催化氧化乙苯制苯乙酮

合成了一系列具有Keggin结构的P-Mo-V杂多化合物(Cpyr)3+xPMo12-xVxO40.nH2O(其中Cpyr=(C16H32C5H4N)+,x=0、1、2、3),并表征了其结构。以磷钼钒杂多化合物为相转移催化剂,用w(H2O2)=50%的双氧水氧化乙苯制备苯乙酮,考察了催化剂的种类、溶剂的类型和反应条件对乙苯氧化反应的影响。在优化条件下,即乙苯25 mmol、催化剂0.2 mmol、w(H2O2)=50%的H2O20.1 mol、在70℃反应8 h、溶剂乙酸25 mL,乙苯的转化率达到80.75%、苯乙酮的选择性达到81.46%。

无机-有机杂化钼磷、钒钼磷多酸化合物的合成与结构

通过对V2 O5 ,Na2 MoO4·2H2 O ,HF ,Ni(NO3) 2 ·6H2 O ,H3PO4和吡啶体系水热反应的研究 ,合成并表征了无机 -有机杂多酸化合物 [C5 H6 N] 3[C5 H5 N][PMo12 O40 ] ( 1 ) ,[C5 H6 N] 4[PVMo11O40 ] ( 2 )和 [C5 H6 N] 4[HPV2 Mo10 O40 ] ( 3 ) .化合物( 1 )属单斜晶系 ,C/ 2c空间群 ,a =2 .1 867( 6)nm ,b =1 .3 978( 4)nm ,c =1 .663 3( 3 )nm ,β =1 0 5.73 ( 1 0 )°,V =4 .893nm3,R =0 .0 60 4 ,Z =4 ;化合物 ( 2 )属单斜晶系 ,C/ 2c空间群 ,a =2 .1 858( 4)nm ,b =1 .3 971 ( 3 )nm ,c =1 .663 5( 3 )nm ,β =1 0 5.83 ( 3 )°,V =4 .8873 ( 1 7)nm3,Z =4 ,R =0 .0 4 63 ;化合物 ( 3 )属单斜晶系 ,P2 1n空间群 ,a =1 .1 1 2 2 ( 2 )nm ,b =1 .94 1 2 ( 3 )nm ,c=1 .2 4 84 ( 3 )nm ,β =99.89( 3 )°,V =2 .6565( 9)nm3,Z =2 ,R =0 .0 690 .

镧钼钒磷杂多化合物氧化甲苯制苯甲醛的催化性能研究

报道了含稀土元素镧的钼钒磷四元杂多配合物K15[La(PMo9V2 O3 9) 2 ]·6H2 O的合成及对甲苯选择性氧化制苯甲醛的催化活性 。

杂多化合物(NH_4)_9SnMo_5VO_(24)·6H_2O的合成与表征

本文首次合成了锡钼钒三元杂多化合物(NH4)9SnMo5VO24.6H2O;通过元素分析、IR、UV、等分析方法对其进行了表征.此外对此化合物的发光性能进行了初步研究.

镱钼钒磷四元杂多化合物催化苯酚羟化反应的研究

合成了具有Keggin结构镱钼钒磷杂多化合物 ,用IR、UV、XRD、ICP等手段对其结构进行了表征。并研究了该杂多化合物对苯酚过氧化氢羟化反应的催化活性。实验结果表明 :以甲醇为溶剂 ,用镱钼钒磷杂多化合物为催化剂 ,当n(phOH)∶n(H2 O2 ) =1∶2 ,反应体系的pH =5.0 ,反应时间 4h ,苯酚转化率为 4 1 66% ,对苯二酚产率可达到 4 0 .2 4 %。

生物质副产物粗甘油制备丙烯酸

以粗甘油为原料,采用新型负载型杂多酸催化剂和氧化物催化剂,通过两段反应制备丙烯酸。利用BET、NH_3-TPD、FTIR和原子吸收光谱分析等方法分析了粗甘油中不同杂质的影响。实验结果表明,粗甘油中的无机盐离子是造成粗甘油脱水产物丙烯酸收率降低、乙酸收率增加的主要原因。Na^+和K^+等碱金属杂质沉积在HPW/Cs-SBA催化剂表面,导致催化剂的比表面积和孔体积显著降低,平均孔径增大,催化剂上大量的中强酸性位点转化成弱酸性位点,酸性位点的总量也有所下降。只需对粗甘油进行脱盐处理,而不需要脱除其他有机物杂质即可用于脱水制备丙烯酸,反应70 h内丙烯酸收率稳定在86%左右,与使用精制甘油时的效果相当。

Characterization of V_2O_5/MoO_3 composite photocatalysts prepared via electrospinning and their photodegradation activity for dimethyl phthalate

Vanadium pentoxide（V2O5）/molybdenum trioxide（MoO 3） composites with different molar ratios of vanadium（V） to molybdenum（Mo） were synthesized via a simple electrospinning technique. The photocatalytic activity of the composites were evaluated by their ability to photodegrade methylene blue and dimethyl phthalate（DMP） under visible-light irradiation. Compared with pure V2O5 and MoO 3,the V2O5/MoO 3 composites showed enhanced visible-light photocatalytic activity because of a V 3d impurity energy level and the formation of heterostructures at the interface between V2O5 and MoO 3. The optimal molar ratio of V to Mo in the V2O5/MoO 3 composites was found to be around 1/2. Furthermore,high-performance liquid chromatographic monitoring revealed that phthalic acid was the main intermediate in the photocatalytic degradation process of DMP.

A Novel Mo-Doped Compound with Graphite-Like Structure: [H_3O]_2V_3O_8

The hydrothermal reaction of Na2MoO4 . 2H(2)O, V2O5 and en in water gave rise to a graphite-shaped vanadate [H3O](2)V3O8 1, which is doped with molybdenum. Compound 1 crystallizes in tetragonal system, space group P4bm, H6O10V2.9Mo0.1, M-r = 323.37, a = 8.904(1), c = 5.573(1)Angstrom, V = 441.8(1)Angstrom (3), Z = 2, D-c = 2.431 g.cm(-3), mu = 3.137 mm(-1), F(000) = 314, the final R = 0.0477, wR = 0.0993 for 260 observed reflections. Its two-dimensional framework is built up by corner-shared ((VO4)-O-V) tetrahedra and ((VO5)-O-IV) square pyramids with all of the terminal oxygen atoms toward the same orientation and further connected inta three-dimensional framework through hydrogen bonding between the protoned water molecules.