NDLI: Transformation of acetophenone over Pd aluminosilicate catalysts. Influence of acidity and pore structure

Content Provider	Springer Nature Link
Author	Magux, P. Lavaud, N. Guisnet, M.
Copyright Year	2000
Abstract	The gas phase transformation of acetophenone under hydrogen was investigated in a fixed-bed reactor over series of bifunctional Pd molecular sieves (HFAU, HBEA, MCM41). On all the catalysts, the desired product: 1,3-diphenylbutan-1-one (DPBO) which results from three successive steps: aldolisation then dehydration on the acid sites and hydrogenation over Pd sites, can be obtained directly. Benzoic acid, isopropenylbenzene and its transformation products formed by acid cracking of intermediates of DPBO production are the main secondary products. As expected from a bifunctional mechanism, the rate of DPBO formation over Pd zeolite samples of identical acidities increases firstly with the number of accessible Pd atoms (nPd) then remains constant above a certain value of nPd. On the other hand, nPd has a negative effect on the formation of the main secondary products. However, the main parameter determining the rate and selectivity of the Pd catalysts is their porosity, the most active and selective catalysts being large pore zeolites with a large mesopore volume (Pd HFAU and Pd HBEA) or mesoporous aluminosilicates (Pd HMCM41). This large effect of porosity can be related to limitation in the desorption of the bulky and polar molecules of DPBO (and olefinic intermediate) from the micropores.
Starting Page	291
Ending Page	299
Page Count	9
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	13
Issue Number	3
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2000-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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