Tethering of Cu(II), Co(II) and Fe(III) tetrahydro-salen and salen complexes onto amino-functionalized SBA-15: Effects of salen ligand hydrogenation on catalytic performances for aerobic epoxidation of styrene

Yang, Ying; Zhang, Ying; Hao, Shijie; Kan, Qiubin

doi:10.1016/j.cej.2011.05.047

Cited by 105 publications

(40 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The similar effects of encapsulation and hydrogenization on the [H 2 ] and [H 4 ] complexes were observed by Yang et al in the aerobic epoxidation of styrene [6]. Methanol to the system probably retarded radicals [36,37] thus the selectivity was high when using (80% H 2 O 1 20% CH 3 OH) as the solvent (Table 2).…”

Section: Catalytic Oxidation Of Kraft Ligninsupporting

confidence: 75%

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Zhou

2015

Env Prog and Sustain Energy

View full text Add to dashboard Cite

The encapsulated copper (II) tetrahydro-salen and salen complexes were prepared in NaY for oxidation of kraft lignin to obtain phenolic monomer. Structural information obtained by spectroscopies suggested that geometry was correlated to the enhanced chemical behavior of the complexes. Characterization using gas chromatography-mass spectrometry demonstrated that catalyzed reactions of kraft lignin in the presence of CH 3 COOOH produced major products including 2-methoxy phenol, 4-hydroxy benzaldehyde, 4-hydroxy-3,5-dimethoxyphenyl ethanone. The encapsulation and hydrogenation of complexes could improve reactivity. There was a greater improvement in reactivity for complexes on the immobilization by ship-in-a-bottle method (SB) as compared with by impregnation method, and additionally a methanol fraction in the solvent proved beneficial effect for the product generation over these complexes in the oxidation of kraft lignin. Cu ([H 4 ]salen)/SB was proved to be most active as giving the highest kraft lignin converted per mole metal ion and selectivity.

show abstract

Section: Catalytic Oxidation Of Kraft Ligninsupporting

confidence: 75%

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Zhou

2015

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…[14] However, these catalysts sustain a certain level of difficulties in separation and inevitably result in time and energy consumption. [14] However, these catalysts sustain a certain level of difficulties in separation and inevitably result in time and energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we found that tethering of copper(II), cobalt(II), iron(III), and oxovanadium(IV) transition-metal complexes onto SBA-15 or GO material resulted in catalysts that were highly active in the epoxidation of styrene. [14] However, these catalysts sustain a certain level of difficulties in separation and inevitably result in time and energy consumption. To resolve these problems, one possible solution is to prepare magnetically separable nanocatalysts that allow easy separation of the catalyst by simply applying an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Aerobic Epoxidation of Styrene with Copper(II), Cobalt(II), Iron(III), or Oxovanadium(IV) Salen Complexes Immobilized onto Carbon‐Coated Fe₃O₄ Nanoparticles Hybridized with Graphene Sheets

Dong

et al. 2014

ChemPlusChem

Self Cite

View full text Add to dashboard Cite

Core–shell structural magnetic nanocatalysts, involving carbon‐coated magnetic Fe3O4 nanoparticles supported on graphene oxide sheets (mildly reduced graphene oxide (MRGO)/Fe3O4@C) and carbonaceous coatings on magnetic Fe3O4 nanoparticles (Fe3O4@C), for immobilizing metal (CuII, CoII, FeIII or VOIV)–salen complexes were prepared by a facile, green, and efficient chemical approach and first applied in the aerobic epoxidation of styrene with air as the oxidizing agent. The prepared catalysts were characterized by different techniques, such as XRD, TEM, FTIR spectroscopy, inductively coupled plasma atomic emission spectroscopy, TEM, thermogravimetric analysis, Raman spectroscopy, and X‐ray photoelectron spectroscopy. The magnetic nanocatalysts MRGO/Fe3O4@C–salen–M (M=Cu, Co, Fe, or V) exhibited higher catalytic reactivity than that of the corresponding Fe3O4@C–salen–M (M=Cu, Co, Fe, or V) species possibly owing to site isolation, good dispersion of magnetic Fe3O4 nanoparticles, and an efficiently synergistic effect between the metal complexes and the supports. Furthermore, MRGO/Fe3O4@C–salen–Co exhibited up to 92.3 % conversion of styrene and 59.2 % selectivity to the styrene oxide upon using air as the oxidizing agent and showed good recoverability with negligible loss in activity and selectivity within successive runs owing to superparamagnetism. Most importantly, these materials can be easily recovered by simple magnetic separation.

show abstract

“…C 0U(VI) = 2.00 9 10 -4 mol L -1 , C NaNO3 = 0.1 mol L -1 , T = 298 ± 1 K, pH = 4.00 ± 0.02, t = 48 h J Radioanal Nucl Chem content increasing at a low solid-to-liquid ratio, while it increases slightly at a high solid-to-liquid ratio for all materials. The result of improved sorption can be attributed to the binding sites of the materials surface for U(VI) increased [59,60]. As we can see, the sorption percentage of U(VI) on KIT-6-quinoline-8-ol and KIT-6-quinaldine-8-ol is much higher than KIT-6, this is owing to quinolone-8-ol and quinaldine-8-ol have a strong combining ability with U(VI).…”

Section: Effect Of Solid/liquid Ratiomentioning

confidence: 91%

Mesoporous silica (KIT-6) derivatized with hydroxyquinoline functionalities as a selective adsorbent of uranium(VI)

Zhu

Shi

Song

et al. 2015

J Radioanal Nucl Chem

View full text Add to dashboard Cite

Two modified mesoporous silica (KIT-6) materials for absorbing uranium(VI) were prepared respectively via post-grafting of 8-hydroxyquinoline and 8-hydroxyquinoline onto surface of KIT-6, which were characterized by FT-IR, NMR, TEM, and sorption/desorption analysis. Effect of pH values, contact time, ionic strength, solid-liquid ratio, temperature, and coexisting ions on sorption behavior of the modified KIT-6 were also investigated. Typical sorption isotherms (Langmuir and Freundlich) were used to determine the sorption process and the maximum U(VI) sorption capacity. The results indicate that the two modified KIT-6 exhibit better selective sorption of U(VI) as compared to the original KIT-6.

show abstract

Tethering of Cu(II), Co(II) and Fe(III) tetrahydro-salen and salen complexes onto amino-functionalized SBA-15: Effects of salen ligand hydrogenation on catalytic performances for aerobic epoxidation of styrene

Cited by 105 publications

References 44 publications

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Enhanced Aerobic Epoxidation of Styrene with Copper(II), Cobalt(II), Iron(III), or Oxovanadium(IV) Salen Complexes Immobilized onto Carbon‐Coated Fe₃O₄ Nanoparticles Hybridized with Graphene Sheets

Mesoporous silica (KIT-6) derivatized with hydroxyquinoline functionalities as a selective adsorbent of uranium(VI)

Contact Info

Product

Resources

About

Tethering of Cu(II), Co(II) and Fe(III) tetrahydro-salen and salen complexes onto amino-functionalized SBA-15: Effects of salen ligand hydrogenation on catalytic performances for aerobic epoxidation of styrene

Cited by 105 publications

References 44 publications

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H4]salen and [H2]salen complexes

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H4]salen and [H2]salen complexes

Enhanced Aerobic Epoxidation of Styrene with Copper(II), Cobalt(II), Iron(III), or Oxovanadium(IV) Salen Complexes Immobilized onto Carbon‐Coated Fe3O4 Nanoparticles Hybridized with Graphene Sheets

Mesoporous silica (KIT-6) derivatized with hydroxyquinoline functionalities as a selective adsorbent of uranium(VI)

Contact Info

Product

Resources

About

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Catalytic oxidation and conversion of kraft lignin into phenolic products using zeolite‐encapsulated Cu(II) [H₄]salen and [H₂]salen complexes

Enhanced Aerobic Epoxidation of Styrene with Copper(II), Cobalt(II), Iron(III), or Oxovanadium(IV) Salen Complexes Immobilized onto Carbon‐Coated Fe₃O₄ Nanoparticles Hybridized with Graphene Sheets