Related Experiment Video
Updated: Jun 12, 2026
12:04
Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
Published on: May 20, 2018
Continuous flow hydroformylation using supported ionic liquid phase catalysts with carbon dioxide as a carrier.
Ulrich Hintermair1, Zenxing Gong, Ana Serbanovic
1EaStCHEM, School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, Scotland.
Dalton Transactions (Cambridge, England : 2003)
|June 4, 2010
Summary
This study demonstrates a supported ionic liquid phase (SILP) catalyst for continuous flow hydroformylation. Optimized CO(2) pressure enhances reaction rates and reduces catalyst leaching, achieving high stability and selectivity.
Area of Science:
- Catalysis
- Chemical Engineering
- Materials Science
Background:
- Supported ionic liquid phase (SILP) catalysts offer potential for continuous flow processes.
- Hydroformylation is a key industrial reaction for producing aldehydes.
- Understanding the influence of reaction parameters on SILP catalyst performance is crucial for process optimization.
Purpose of the Study:
- To investigate the continuous flow hydroformylation of 1-octene using a novel SILP catalyst.
- To determine the effect of process parameters, particularly CO(2) pressure, on reaction rate, yield, and catalyst stability.
- To optimize conditions for enhanced catalytic activity and minimized metal leaching.
Main Methods:
- Preparation of a SILP catalyst using [PrMIM][Ph(2)P(3-C(6)H(4)SO(3))], [Rh(CO)(2)(acac)], [OctMIM]NTf(2), and microporous silica.
- Continuous flow hydroformylation of 1-octene in the presence of compressed CO(2).
- Statistical experimental design to analyze the impact of film thickness, syngas:substrate ratio, and CO(2) pressure on reaction performance.
Main Results:
- Reaction rate is influenced by an interaction between syngas:substrate ratio and film thickness.
- Increasing CO(2) pressure improved reaction rates and significantly reduced ionic liquid (IL) and rhodium (Rh) leaching by forming an expanded liquid phase.
- Optimal conditions yielded a stable catalyst with a turnover frequency (TOF) of 500 h(-1) and low Rh leaching (0.2 ppm) over 40 hours, with consistent linear:branched selectivity (l:b ratio ≈ 3).
Conclusions:
- The phase behavior of the mobile phase, controlled by CO(2) pressure, is critical for SILP catalyst performance in hydroformylation.
- Optimized CO(2) pressure enhances mass transfer and reduces catalyst/IL solubility, leading to improved activity and stability.
- The developed SILP catalyst demonstrates robust performance and selectivity for continuous flow hydroformylation.
Related Concept Videos
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
01:28Multiple Halogenation of Methyl Ketones: Haloform Reaction
A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic acyl substitution.
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
01:20Aldehydes and Ketones with Water: Hydrate Formation
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
00:57Cationic Chain-Growth Polymerization: Mechanism
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.