caa a22 4500 475844025 CHVBK 20180406123908.0 cr unu---uuuuu 170329e20000801xx s 000 0 eng 10.1023/A:1009009727910 doi (NATIONALLICENCE)springer-10.1023/A:1009009727910 Transformation of acetophenone over Pd aluminosilicate catalysts. Influence of acidity and pore structure [Elektronische Daten] [P. Magnoux, N. Lavaud, M. Guisnet] 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. Kluwer Academic Publishers, 2000 acetophenone nationallicence bifunctional catalyst nationallicence palladium nationallicence HFAU nationallicence HBEA nationallicence MCM41 nationallicence Magnoux P. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut Lavaud N. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut Guisnet M. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 13/3(2000-08-01), 291-299 1022-5528 13:3<291 2000 13 11244 https://doi.org/10.1023/A:1009009727910 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009009727910 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Magnoux P. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 700 1- Lavaud N. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 700 1- Guisnet M. UMR 6503, Catalyse en Chimie Organique, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 13/3(2000-08-01), 291-299 1022-5528 13:3<291 2000 13 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer