Search results

Sort By:

Limit search:

Enhancement of three-phase kinetic studies of complex reaction systems by semibatch reactor technology

100%

Salmi T., Murzin D., Mäki-Arvela P., Wärnå J., Eränen K., Mikkola J.-P., Denecheau A., Alho K.

2008

vol. 63

257-270

A semibatch reactor concept was proposed for the determination of the kinetics in complex catalytic liquid and gas-liquid systems with reactions of highly varying rates. The method is based on continuous removal of liquid phase from the reactor, while the catalyst remains inside the reactor. The concept was demonstrated by catalytic hydrogenation of citral on Ni catalyst. The primary product (citronellal) is formed very rapidly, while the secondary (citronellol) and tertiary (3,7-dimethyloctanol) products appear much more slowly. With the proposed semibatch concept, the formation of the ultimate products was considerably accelerated and all of the rate parameters were successfully estimated by nonlinear regression analysis. The proposed approach can be extended to fixed beds with recycling as demonstrated by computer simulations.

Dimerization of 1-butene in liquid phase over H-NK-MM-BEA type embedded mesoporous materials

81%

Kumar N., Mäki-Arvela P., Fugleberg S., Yläsalmi T., Villegas J., Heikkilä T., Leino A.-R., Kordás K., Tiitta M., Österholm H., Salmi T., Murzin D.

Catalysis for Sustainable Energy

2012

vol. 1

1-10

Dimerization of 1-butene in the liquid phase was studied at relatively mild conditions, 523 K under 20 bar over both microporous and embedded microporous mesoporous catalysts. Embedded catalysts were prepared by introducing Beta zeolite nuclei into the gel synthesis of mesoporous material. Three different embedded catalysts with different acidities were prepared and characterized by XRD, nitrogen adsorption, TEM, SEM, pyridine adsorption desorption and ammonia TPD. The embedded materials were shown to be thermally stable up to 1173 K, containing both micro- and mesopores and uniform pores with regular periodicity. According to ammonia TPD the acidity increased with increasing aluminium content. Due to the relatively low reaction temperature, the highest yields of C8 hydrocarbons, 33 mol% at the conversion level of 81% were achieved over an embedded micro-mesoporous catalyst containing Beta zeolite inside the mesoporous and totally 2.4 wt.% aluminium.

Refine search results

1 Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

1 Catalysis for Sustainable Energy

1 2012

1 2008

2 Murzin D.

2 Mäki-Arvela P.

2 Salmi T.

1 Alho K.

1 Denecheau A.

1 Eränen K.

1 Fugleberg S.

1 Heikkilä T.

1 Kordás K.

1 Kumar N.

1 Leino A.-R.

1 Mikkola J.-P.

1 Tiitta M.

1 Villegas J.

1 Wärnå J.

1 Yläsalmi T.

1 Österholm H.

Search results

Enhancement of three-phase kinetic studies of complex reaction systems by semibatch reactor technology

Dimerization of 1-butene in liquid phase over H-NK-MM-BEA type embedded mesoporous materials