A novel tandem route to renewable isoprene over Mo-Fe oxide and mesoporous Cu/MgO composite catalysts

Xu, Lulu; Liu, Shuo; Meng, Xiangju; Xiao, Feng-Shou; De Baerdemaeker, Trees; Parvulescu, Andrei-Nicolae; Marler, Bernd; Kolb, Ute; De Vos, Dirk; Yokoi, Toshiyuki; Zhang, Weiping

doi:10.1016/j.apcatb.2023.123341

Cited by 4 publications

(2 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is 6% on NBeta zeolites, higher than HBeta zeolites. This demonstrates that although the increase of basic sites after nitridation improves the methyl acrylate selectivity, it will also form acetone due to the self-condensation of methyl acetate [32,33] . That is to say, both the acidity and basicity of the catalyst significantly influence the reaction performance.…”

Section: Aldol Condensation Catalyzed By Nbeta Zeolitesmentioning

confidence: 95%

“…It can be seen from Figure 1 that after nitridation of HBeta zeolites, both the formaldehyde conversion and the methyl acrylate selectivity are enhanced, but the acetone selectivity, a by-product produced by the selfcondensation of methyl acetate, also increases. Basically, the production of by-product acetone may be due to the strong basicity of the catalyst [32,33] . In general, copper oxide is used as a mild Lewis acid site in many reactions [34] .…”

Section: Effect Of the Acidity And Basicity On The Catalytic Performancementioning

confidence: 99%

See 1 more Smart Citation

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Wang,

Xu,

Zhang

2024

Chem Synth

Self Cite

View full text Add to dashboard Cite

Highly selective synthesis of renewable methyl acrylate from bio-sourced formaldehyde and methyl acetate through one-step aldol condensation was successfully realized on Cu-modified nitrogen-containing Beta (NBeta) catalysts. Silicon-29 magic angle spinning nuclear magnetic resonance (29Si MAS NMR), Fourier transform infrared spectroscopy (FT-IR), temperature-programmed desorption of ammonia, temperature-programmed desorption of carbon dioxide, and element analysis indicate that nitridation weakens the acid strength, reduces the number of acidic sites and introduces basic sites through the formation of Si−N bond on Beta zeolites, thereby promoting methyl acrylate selectivity and reducing the coke formation. Adding Cu into NBeta further finely tunes the basicity and acidity balance and thus inhibits the by-product acetone. High methyl acrylate selectivity of 95% and formaldehyde conversion of 99% were achieved over Cu/NBeta catalyst under optimized conditions. The coke content decreases remarkably from 28% on H-form Beta (HBeta) zeolites to 17% on NBeta zeolites doped with Cu due to its appropriate basicity/acidity. Cu/NBeta has good regeneration capability, and the weakening of Si-N species may account for the decline of catalytic performance after successive regeneration. The catalytic performance was restored when the regenerated catalyst was nitridated again.

show abstract

Section: Aldol Condensation Catalyzed By Nbeta Zeolitesmentioning

confidence: 95%

Section: Effect Of the Acidity And Basicity On The Catalytic Performancementioning

confidence: 99%

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Wang,

Xu,

Zhang

2024

Chem Synth

Self Cite

View full text Add to dashboard Cite

show abstract

Highly Efficient and Selective Synthesis of Renewable Isoprene Over Mo‐Fe‐O and MgO/Mg(OH)₂ Composite Catalysts

Xu,

Liu,

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

Synthesis of renewable isoprene continues to attract significant interest, yet catalysts still need improvement for industrial applications. We report herein an efficient and novel Prins tandem approach for highly selective production of isoprene from bio‐based methanol and isobutene over Mo‐Fe‐O and MgO/Mg(OH)2 acid‐base bifunctional catalysts. Hydration decreases the number of strong basic sites O2‐ ions and increases OH groups over MgO, thus improving the isoprene selectivity. Basic OH on Mg(OH)2 promotes the Prins condensation of formaldehyde and isobutene, while acidic OH promotes dehydration of isoprenol to isoprene. Suitable contents and proportions of basic and acidic OH groups over Mg(OH)2 increase isoprene selectivity and methanol conversion to 90 and 92% on the Mo‐Fe‐O+Mg(OH)2 composite catalysts, respectively. It exhibits good recycling stability, with isoprene selectivity remaining 90% after five successive regenerations. DFT calculations reveal OH groups formed after hydration reduce the energy barrier of the H transfer step, thereby promoting the overall reaction.

show abstract

Direct and efficient catalytic conversion of biomass-derived 2-methyltetrahydrofuran to 1,3-pentadiene via acid-base coupling of lanthanum phosphate

Feng,

Qi,

Cui

et al. 2024

Chemical Engineering Journal

View full text Add to dashboard Cite

A novel tandem route to renewable isoprene over Mo-Fe oxide and mesoporous Cu/MgO composite catalysts

Cited by 4 publications

References 74 publications

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Highly Efficient and Selective Synthesis of Renewable Isoprene Over Mo‐Fe‐O and MgO/Mg(OH)₂ Composite Catalysts

Direct and efficient catalytic conversion of biomass-derived 2-methyltetrahydrofuran to 1,3-pentadiene via acid-base coupling of lanthanum phosphate

Contact Info

Product

Resources

About

A novel tandem route to renewable isoprene over Mo-Fe oxide and mesoporous Cu/MgO composite catalysts

Cited by 4 publications

References 74 publications

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites

Highly Efficient and Selective Synthesis of Renewable Isoprene Over Mo‐Fe‐O and MgO/Mg(OH)2 Composite Catalysts

Direct and efficient catalytic conversion of biomass-derived 2-methyltetrahydrofuran to 1,3-pentadiene via acid-base coupling of lanthanum phosphate

Contact Info

Product

Resources

About

Highly Efficient and Selective Synthesis of Renewable Isoprene Over Mo‐Fe‐O and MgO/Mg(OH)₂ Composite Catalysts