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Volume 9
Journal of Chemical Engineering & Process Technology
Catalysis 2018
September 05-06, 2018
September 05-06, 2018 Tokyo, Japan
5
th
World Congress on
Catalysis and Chemical Engineering
Baoxin Zhang et al., J Chem Eng Process Technol 2018, Volume 9
DOI: 10.4172/2157-7048-C2-015
Highperformance phosphite ligands containing various numbers of structural units forn-regioselective
hydroformylation of olefins
Baoxin Zhang, Detlef Selent and Armin Börner
Leibniz Institute for Catalysis, Germany
I
n comparison to phosphines, phosphite is stubborner ligands towards oxidation and therefore finds numerous catalytic
applications at each scale. Especially in Rh-catalyzed regioselective hydroformylation of internal olefins, they are
indispensable in the isomerization in favor of linear products. Starting from a prototype of all monophosphites tris(2,4-di-
tert-butylphenyl) phosphite, which has already been applied in an industrial scale, a new type of polyphosphites containing
two and four the similar structural units were prepared. Their catalytic performances as well as hydrolytic stabilities were
compared. In Rh-catalyzed hydroformylation of n-octenes, when the phosphite unit of the ligands was increased, the best
yield was obtained from the reaction with the biphosphite. The n-selectivity is improved with the increased phosphite moiety,
whilst the activity decreases. The regioselectivity is kinetically controlled. Lowering syngas pressure benefits the n-selectivity
but decreases the catalyst activity. Besides, the hydrolysis pathway of one of the prepared biphosphites was clarified with
in situ NMR spectroscopy. Surprisingly, its first step degradation was conducted simultaneously through three routes. The
biphosphite cannot build a metal complex in a chelating manner. Instead, a binuclear Rh-complex was formed, which can
further stabilize the ligand towards hydrolysis.
Biography
Baoxin Zhang has completed his PhD majoring Organometallic Chemistry from Technical University of Darmstadt in Germany. He is currently a Research
Fellow at Leibniz Institute for Catalysis (LIKAT) in Rostock. In the laboratory of Evonik Advanced Catalysis, he is doing research in homogeneous catalysis for
hydroformylation and development of phosphorus ligands.
baoxin.zhang@catalysis.de