Pm3n mesoporous aluminosilicates isomorphous to SBA-1, with 3D interconnected pore structures, were assembledfrom Al-incorporating zeoliteseeds at around pH 9 using cetyltriethylammonium bromide as a pore-directing agent. The resultant series of materials (termed Al–ZSBA-1) has the advantages of strong acidity from the zeolitic structure and good diffusivity of bulky reactants from the 3D interconnected
使用十六烷基三乙基溴化铵作为导孔剂,从pH约为9的掺铝沸石种子中,组装了与SBA-1同构的立方Pm 3 n介孔铝硅酸盐,并在其中加入了Al分子筛种子。所得的一系列材料(称为Al–ZSBA-1)具有沸石结构的强酸性和3D互连中孔的大体积反应物良好扩散性的优点。Al–ZSBA-1,Al含量高达0.057的Al / Si时,仍保留了立方Pm 3 n结构和高表面积(约600 m 2 g -1)。酸度强于使用硅酸钠作为二氧化硅源(称为Al–SBA-1-alk)制备的相对材料。此外,Al–ZSBA-1中的所有Al(III)离子在823 K下煅烧后仍保持其四面体配位,而Al–SBA-1-alk中的部分Al(III)变为八面体配位。当测试肉桂醇对2,4-二叔丁基苯酚的催化烷基化反应时,与Al-SBA-1-alk,ZSM-5和β沸石相比,Al-ZSBA-1具有更高的黄烷选择性和产率。
Certain cinnamyl phenols as growth inhibitors for mosquito larvae
申请人:The United States of America as represented by the Secretary of
公开号:US03973040A1
公开(公告)日:1976-08-03
Poly-t-butyl-cinnamyl phenols and poly-t-butyl-dihydrocinnamyl phenols are disclosed to be useful for inhibiting the growth of mosquito larvae, thus providing means for controlling mosquito populations.
Polybutyl-2-cinnamylphenols as insect anti-procreants
申请人:The United States of America as represented by the Secretary of
公开号:US03959489A1
公开(公告)日:1976-05-25
New polybutyl-2-cinnamylphenols, particularly 4,6-di-t-butyl-2-cinnamylphenol, are useful for insect control and especially as insect chemosterilants and oviposition inhibitors.
Aluminium-containing mesoporous benzene-silicas with crystal-like pore wall structure
作者:Qihua Yang、Jie Yang、Zhaochi Feng、Ying Li
DOI:10.1039/b507437a
日期:——
Mesoporous benzene-silicas with a high content of tetrahedral aluminium in the framework (Si/Al = 37 and 59) were successfully synthesized, as evidenced by X-ray diffraction, N2 sorption analyses, transmission electron microscopy and solid state 13C CP-MAS, 27Al and 29Si MAS NMR spectroscopy. These materials have well-ordered 2D hexagonal mesostructure with a molecular scale periodicity in the pore walls. The existence of the phenylene groups in the framework greatly enhances the hydrothermal stability of the aluminium-containing mesoporous benzene-silicas. The acidity of the mesoporous benzene-silicas arising from the incorporated aluminium was measured by the FT-IR spectra of pyridine adsorption measurements. The organic groups bridged in the mesoporous framework affect significantly the acidity of the resultant materials although most aluminium atoms are in tetrahedral coordination. These materials are catalytically active for alkylation of 2,4-di-tert-butylphenol with cinnamyl alcohol.
通过 X 射线衍射、N2 吸附分析、透射电子显微镜和固态 13C CP-MAS、27Al 和 29Si MAS NMR 光谱,成功合成了框架中含有大量四面体铝(Si/Al = 37 和 59)的介孔苯硅。这些材料具有井然有序的二维六边形介观结构,孔壁具有分子尺度的周期性。框架中苯基基团的存在大大提高了含铝介孔苯硅胶的水热稳定性。通过对吡啶吸附的傅立叶变换红外光谱测量,得出了因加入铝而产生的介孔苯硅胶的酸性。尽管大多数铝原子都是四面体配位,但介孔框架中桥接的有机基团对生成材料的酸度有很大影响。这些材料对 2,4- 二叔丁基苯酚与肉桂醇的烷基化具有催化活性。