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Controllable Synthesis of VSB‐5 Microspheres and Microrods: Growth Mechanism and Selective Hydrogenation Catalysis
Author(s) -
Liu ShuJuan,
Cheng HaiYang,
Zhao FengYu,
Gong JunYan,
Yu ShuHong
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701822
Subject(s) - hexamethylenetetramine , catalysis , nanorod , selectivity , aniline , chemical engineering , nanoporous , chemistry , materials science , morphology (biology) , nuclear chemistry , nanotechnology , organic chemistry , engineering , biology , genetics
Nanoporous VSB‐5 nickel phosphate molecular sieves with relatively well controllable sizes and morphology of microspheres assembled from nanorods were synthesized at 140 °C over a short time in the presence of hexamethylenetetramine (HMT) by a facile hydrothermal method. The pH value, reaction time, and ratio of HMT to NaHPO 2 ⋅H 2 O crucially influence the morphology and quality of the final products. By adjusting the pH value of the initial reaction solution, the morphology changes from disperse rods to microspheres assembled from rods and finally to a large quantity of fibers, and the diameters of the VSB‐5 rods can be varied. The catalytic activity of VSB‐5 in selective hydrogenation of several unsaturated organic compounds was tested. Nickel(II) in VSB‐5 can selectively catalyze hydrogenation of CC in trans ‐cinnamaldehyde and 3‐methylcrotonaldehyde. In addition, since nitrobenzene (NB) and 2‐chloronitrobenzene could be reduced to aniline (AN) and 2‐chloroaniline with high selectivity, VSB‐5 could have potential applications in synthesizing dyes, agrochemicals, and pharmaceuticals.