Gas phase hydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) over supported gold catalysts
-
Add time:09/27/2019 Source:sciencedirect.com
We report the first continuous (gas phase) hydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) over oxide (Al2O3, TiO2, CeO2 and ZrO2) supported Au catalysts. Thermochemical analysis has established possible thermodynamic constraints and product distribution at equilibrium. The catalysts have been characterised by temperature-programmed reduction (TPR), H2/O2 chemisorption/temperature-programmed desorption (TPD), BET surface area/porosity, X-ray diffraction (XRD) and scanning/transmission electron microscopy (STEM/TEM) measurements. The effects of space velocity (2–6 × 104 h−1), temperature (353 and 473 K) and H2 partial pressure (8 × 10−4–0.93 atm) on catalyst performance have been examined. Selectivity to the target cyclohexanone oxime is sensitive to H2 pressure, where an increase in temperature favours cyclohexanone with amine/ketone condensation and subsequent reduction to dicyclohexylamine. An increase in turnover frequency was observed with decreasing (surface area weighted) mean Au size (from 7.0 to 4.3 nm) but a lower value was obtained for 3.0 nm Au (on CeO2) that is linked to suppressed H2 chemisorption (under reaction conditions) resulting from strong interaction with the partially reduced support. We establish a critical surface interplay between imine, H and –OH that governs selectivity. Au/Al2O3 exhibited the highest activity and oxime selectivity (maximum = 95%), Au/CeO2 promoted near exclusive production of cyclohexanone whereas Au/TiO2 and Au/ZrO2 generated a cyclohexylamine/cyclohexanone mixture.
We also recommend Trading Suppliers and Manufacturers of NITROCYCLOHEXANE (cas 1122-60-7). Pls Click Website Link as below: cas 1122-60-7 suppliers
Prev:Short CommunicationHighly selective co-production of NITROCYCLOHEXANE (cas 1122-60-7) and adipic acid from vapor phase catalytic nitration–oxidation of cyclohexane with NO2
Next:Selective hydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) to cyclohexanone oxime with H2 on decorated Pt nanoparticles) - 【Back】【Close 】【Print】【Add to favorite 】
- Related Information
- Preparation, crystal structure and thermal decomposition kinetics of 1-(2,4-dinitrophenyl)azo-1-NITROCYCLOHEXANE (cas 1122-60-7)09/30/2019
- Synthesis of polyhydroxylated α-NITROCYCLOHEXANE (cas 1122-60-7) carboxylic acids derived from d-glucose: a striking case of racemization09/29/2019
- Selective hydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) to cyclohexanone oxime by alumina-supported gold cluster catalysts09/28/2019
- Selective hydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) to cyclohexanone oxime with H2 on decorated Pt nanoparticles10/01/2019
- Short CommunicationHighly selective co-production of NITROCYCLOHEXANE (cas 1122-60-7) and adipic acid from vapor phase catalytic nitration–oxidation of cyclohexane with NO209/26/2019
- Short CommunicationHydrogenation of NITROCYCLOHEXANE (cas 1122-60-7) to cyclohexanone oxime over Pd/CNT catalyst under mild conditions09/25/2019
- Short CommunicationNITROCYCLOHEXANE (cas 1122-60-7) hydrogenation to cyclohexanone oxime over mesoporous carbon supported Pd catalyst09/24/2019