Lewis acidic zeolite Beta catalyst for the Meerwein–Ponndorf–Verley reduction of furfural

Abstract

Tin-, zirconium- and hafnium-containing siliceous Beta zeolite were investigated in the Meerwein–Ponndorf–Verley reduction of furfural under continuous flow conditions.

Lewis Acid Zeolites for Biomass Conversion: Perspectives and Challenges on Reactivity, Synthesis, and Stability

“…Tang et al (29) found that Zr-Beta with introduced mesoporosity retained constant activity for the ring-opening reaction of styrene oxide with aniline through five recycles, whereas the untreated Zr-Beta lost 75% of its initial activity. In the MPV reduction of furfural with Sn-, Zr-, and Hf-Beta in flow, the major mode of deactivation is the blockage of pores by the polymerization of the product furfuryl alcohol (107). The authors were able to mitigate deactivation by running the reaction at higher temperatures to decrease product adsorption.…”

Batch versus Continuous Flow Performance of Supported Mono‐ and Bimetallic Nickel Catalysts for Catalytic Transfer Hydrogenation of Furfural in Isopropanol

“…[5] The catalytic route to furfural through dehydration and isomerization today is still challenging route. [3] High selectivity to furfuryl alcohol (FA) has been demonstrated for numerous catalysts, [8][9][10][11][12][13][14][15][16][17] as the product of the first step in the hydrogenation pathway (Scheme 1b). [3] The hydrogenation route is a highly reported research area, as it can provide a wide range of bulk chemicals.…”

“…MF has shown superior performance as an additive in gasoline fuels compared to other furfural hydrogenation products. [17,18,20] The latter is attractive, not only from the techno-economic point of view, but also because the interphase transfer is improved (solid/liquid for ROH vs. solid/liquid/gas for H 2 ). Beneficial effects on the selectivity to MF have been reported for bimetallic catalysts.…”

Diels–Alder reactions in confined spaces: the influence of catalyst structure and the nature of active sites for the retro-Diels–Alder reaction

“…The effect of confinement of the reactant within the pores of the catalyst can decrease the entropy of the activated complex [17–26 29–30] producing not only an increase of the reaction rate but also a modification of the selectivity. To study this effect, we have firstly carried out the reaction using a large pore Beta zeolite as catalyst.…”

“…While pore dimensions and topology of the microporous materials can affect the selectivity of the reaction, their activity can be strongly limited by a slow diffusion of reactants and products, unless microporous molecular sieves with the appropriated pore dimensions are used as catalyst. Thus, microporous molecular sieves with optimized pore diameters and topologies can be of interest to catalyze DAR [17–26] in where different stereoisomers could be obtained. Lewis-acid centers contained within the framework of zeolite beta (Zr-β, Sn-β) are useful catalysts in the Diels–Alder reaction for the production of bio-based terephthalic acid precursors, one of the monomers for the synthesis of polyethylene terephthalate that is used for the large-scale manufacture of plastic bottles among others.…”