ROTACAT: A Rotating Device Containing a Designed Catalyst for Highly Selective Hydroformylation

Abstract

A novel concept is presented for the immobilization of a homogeneous catalyst. A hydroformylation catalyst was covalently anchored to monoliths that were constructed as the blades of a mechanical stirrer and used in a batch process. The catalyst was effective in the hydroformylation of both higher and lower alkenes and showed a high regioselectivity for the linear aldehyde. The concept was proven to be useful in a liquid organic and aqueous phase as well as in the gas phase and the catalyst could be used numerous times without catalyst deterioration. No catalyst deactivation was observed in a period over half a year.

Copper-Based Integral Catalytic Impeller for the Rapid Catalytic Reduction of 4-Nitrophenol

“…For example, Moulijn et al reported a monolith stirrer covered with a manganese oxide catalyst to decompose hydrogen peroxide. Sandee et al constructed a mechanical stirrer with hydroformylation catalyst-anchored monoliths as the blades, which shows effectiveness in the hydroformylation of both higher and lower alkenes. Our group has also developed a series of integrated catalytic agitators with a specific structure and catalytic species, including Fe-AI, , Ag-AI, and Pd-AI, which exhibit high catalytic activity for 4-NP reduction, Fenton reaction, Suzuki coupling reaction, etc., and feature great separation and recycling stability.…”

Facile Method for the Preparation of Covalent Triazine Framework coated Monoliths as Catalyst Support: Applications in C1 Catalysis

“…Monoliths are also considered attractive catalyst support alternatives compared to conventional carriers in other heterogeneous catalysis applications, including liquid-phase catalysis. [23][24][25][26] Monoliths feature a high void fraction and large geometric surface area, which results in a large contact area between the catalyst and reactants and low-pressure drop under flow conditions. 24 The most widely used monolith support material is based on cordierite (2MgO .…”

“…Monolithic structures are widely used in off-gas treatment, e.g., automotive exhaust gas purification and de-NOx of power plant stack gases . Monoliths are also considered attractive catalyst support alternatives compared to conventional carriers in other heterogeneous catalysis applications, including liquid-phase catalysis. − Monoliths feature a high void fraction and large geometric surface area, which results in a large contact area between the catalyst and reactants and low-pressure drop under flow conditions . The most widely used monolith support material is based on cordierite (2MgO·2Al 2 O 3 ·5SiO 2 ), and it contains a macroporous wall structure. − This macroporous space may create an obstacle for applying a thin uniform layer of the catalyst since it can lead to deposition of ineffective active phase within the macro-pores, where it is not accessible for substrates .…”

Enhancement of Catalyst Performance Using Pressure Pulses on Macroporous Structured Catalysts

“…The semibatch hydrogenation experiments were conducted in a monolithic stirrer reactor. This reactor type has been used for several studies − and has great potential in the fine chemical industry. The conditions used were 2.3 bar, 600 rpm, and 24.4 ± 0.3 °C.…”