Practical catalytic hydrogenation techniques and applications pdf
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- Carbon Monoxide Promotes the Catalytic Hydrogenation on Metal Cluster Catalysts
- Green and Simple Method for Catalytic Hydrogenation of Diene-Based Polymers
- Recent Advances in Heterogeneous Catalytic Hydrogenation of CO2 to Methane
- Hydrogenation in Practice
Carbon Monoxide Promotes the Catalytic Hydrogenation on Metal Cluster Catalysts
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Green and Simple Method for Catalytic Hydrogenation of Diene-Based Polymers
Transition metal-based bimetallic catalysts for the chemoselective hydrogenation of furfuraldehyde. Jorge J. In this work, the liquid-phase chemoselective hydrogenation of furfural was studied, employing Pt, Rh and Ni-based catalysts. Bimetallic systems, containing different amounts of tin, were obtained by means of controlled surface reactions between a monometallic catalyst and Sn C 4 H 9 4. The results obtained when monometallic catalysts were employed suggest a relationship between metal properties and the activity and selectivity obtained. The addition of tin has different effects on the three systems, both in terms of conversion and selectivity. Keywords: furfural, furfuryl alcohol, hydrogenation, bimetallic catalysts, PtSn.
Recent Advances in Heterogeneous Catalytic Hydrogenation of CO2 to Methane
For many edible purposes and for some commercial applications it is desirable to produce solid fats. Many shortenings and margarines contain hydrogenated hardened oils as their major ingredients. The development of margarine and shortening products resulted from the invention of a successful method for converting low-melting unsaturated fatty acids and glycerides to higher-melting saturated products. The process consists of the addition of hydrogen in the presence of a catalyst to the double unsaturated bonds. Thus oleic or linoleic acid or their acid radicals in glycerides , which are normally liquid at room temperature, can be converted to stearic acid or the acid radical by the addition of hydrogen.
The hydrogenation of fats and oils and their oleochemical derivatives such as fatty acids, fatty acid esters and fatty nitriles has proven to be a very useful and versatile way to modify these starting materials. This chapter will be limited to discussing exclusively the hydrogenation of carbon-carbon double bonds.
Hydrogenation in Practice
Cuixian Yang a , Andrew R. Teixeira a , Yanxiang Shi a , Stephen C. E-mail: kfjensen mit. Recent advancements in micro-flow technologies and a drive toward more efficient, greener and safer processes have led to a renaissance in flow-chemistry for pharmaceutical production. In this work, we demonstrate the use of a stabilized Pd nanoparticle-organic-silica catalyst to selectively catalyze the hydrogenation of N nitrophenyl nicotinamide, a functionalized active pharmaceutical ingredient API surrogate. A kinetic analysis has revealed that the surface catalyzed hydrogenation progresses through a condensation mechanism whereby an azo dimer intermediate is formed and rapidly consumed.
Size effect plays a crucial role in catalytic hydrogenation. The highly dispersed ultrasmall clusters with a limited number of metal atoms are one candidate of the next generation catalysts that bridge the single-atom metal catalysts and metal nanoparticles. However, for the unfavorable electronic property and their interaction with the substrates, they usually exhibit sluggish activity. Taking advantage of the small size, their catalytic property would be mediated by surface binding species. The combination of metal cluster coordination chemistry brings new opportunity.