Coated monolithic base material and monolithic catalyst
A monolithic catalyst and monolithic technology, applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of low activity, short catalyst life, poor selectivity, etc., and achieve the effect of reducing surface area
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0080] Hydrogenation of nitrobenzene using isopropanol as co-solvent
[0081] The hydrogenation of nitrobenzene (NB) was performed using a series of monolithic catalysts of the present invention with various organic coatings. The hydrogenation reaction was carried out in isopropanol solution of 40 wt% concentration of NB, and the hydrogenation rate was measured when the conversion rate was 50%. The monolithic catalysts were tested in a liquid phase. Isopropanol was added as a solvent to mix the two immiscible phases of nitrobenzene and water. The reaction conditions were 120°C, 200 psig, and a stirring speed of 1500 rpm.
[0082] In Table 1, the column denoting the initial rate represents the second experimental run in the batch autoclave, while the column denoting the final rate represents the eighth experimental run using the same monolithic catalyst at the same setup . At 50% conversion, the rate is expressed in moles of H 2 / m 3 Catalyst / sec is expressed....
Embodiment 2
[0094] Evaluation of monolithic catalysts for the hydrogenation of nitrobenzene in the absence of co-solvent-two-phase
[0095] A series of monolithic catalysts containing cordierite monoliths and polymer network / carbon washcoats were assayed using neat nitrobenzene as the reactant. The conditions were the same as in Example 1 except that the reaction system contained two liquid phases. The results are shown in Table 2.
[0096] Pd Monolithic Catalysts in Immiscible Two-Phase
[0097] Replotted hydrogen uptake curves of hydrogenation rate versus time for each experimental run show that the hydrogenation rate is nearly constant until the end of the reaction. The near constant rate of hydrogenation was unexpected because of the formation of water as a by-product in the reaction and the appearance of two immiscible phases. As the concentration of water increases, one skilled in the art would expect that the rate of hydrogenation will decrease. In this example, C...
Embodiment 3
[0099] Evaluation of monolithic catalysts in the absence of co-solvents - two phases
[0100] The procedure of Example 2 was repeated except using the monolithic catalyst and an immiscible feed initially consisting of 34 wt% nitrobenzene, 48 wt% aniline and 18 wt% water. The reaction temperature and pressure were 140°C and 400 psig, respectively.
[0101] The hydrogenation rate of embodiment 3 is shown in table 3.
[0102] Pd Monolithic Catalysts in Immiscible Two-Phase
[0103] When the hydrogen uptake curves of hydrogenation rate versus time were re-plotted, the hydrogenation rates of monolithic catalyst A, monolithic catalyst D, and monolithic catalyst E in the immiscible two phases were nearly constant. In the experimental production using the monolithic catalyst E, the selectivity to aniline dropped significantly. The surface area of the catalyst E was outside the range required by the present invention.
PUM
| Property | Measurement | Unit |
|---|---|---|
| Surface area | aaaaa | aaaaa |
| Surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More