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Cumene hydroperoxide hydrogenation over Pd/C catalysts
Qing-cai Zhu1, Ben-xian Shen, Hao Ling
1State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
Journal of Hazardous Materials
|November 21, 2009
Summary
The reduction method significantly impacts palladium catalyst performance in cumene hydroperoxide hydrogenation. Formaldehyde-reduced catalysts show higher activity but lower selectivity to alpha-cumyl alcohol compared to hydrogen-reduced ones.
Area of Science:
- Catalysis
- Chemical Engineering
- Materials Science
Background:
- Palladium on carbon (Pd/C) catalysts are crucial for hydrogenation reactions.
- Cumene hydroperoxide (CHP) is a key intermediate in chemical synthesis.
- Optimizing Pd/C catalyst preparation is essential for efficient CHP conversion.
Purpose of the Study:
- To investigate the effect of different reduction methods on Pd/C catalysts for CHP hydrogenation.
- To understand the relationship between palladium particle size and catalytic performance.
- To identify optimal conditions for alpha-cumyl alcohol (CA) production.
Main Methods:
- Preparation of Pd/C catalysts using wet impregnation with K(2)PdCl(4).
- Catalyst reduction using formaldehyde and hydrogen.
- Characterization using X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and CO chemisorption.
- Activity and selectivity testing in CHP hydrogenation.
- Kinetic studies.
Main Results:
- Reduction method significantly influences palladium particle size.
- Formaldehyde-reduced Pd/C exhibits larger particles, leading to higher activity but lower CA selectivity.
- Hydrogen-reduced Pd/C offers comparable CA selectivity to industrial Na(2)SO(3) reduction.
- Elevated temperature and H(2) pressure enhance CHP conversion and CA selectivity.
- CHP hydrogenation follows zero-order kinetics with respect to CHP concentration.
Conclusions:
- Formaldehyde reduction yields more active but less selective Pd/C catalysts for CHP hydrogenation.
- Hydrogen reduction provides a viable alternative for achieving high CA selectivity.
- Optimized reaction conditions (temperature, H(2) pressure) are critical for efficient CA production.
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