Tuning the support acidity of flame-made Pd/SiO2–Al2O3 catalysts for chemoselective hydrogenation

Huang, Jun; Jiang, Yijiao; Vegten, Niels van; Hunger, Michael; Baiker, Alfons

doi:10.1016/j.jcat.2011.05.023

Cited by 60 publications

(91 citation statements)

References 48 publications

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“…However, previous works have shown that the Al atoms with neighbouring SiOH groups (Fig. 1b,c) do not produce such a shift of the 1 H MAS signal of these groups569162021. Supplementary Fig.…”

Section: Resultsmentioning

confidence: 77%

“…The need for efficient and environmentally benign chemical processes has forced the replacement of harmful and corrosive liquid acids by solid acids in various fields of catalysis, including fine chemistry123, renewable energy production456, oil refining and petrochemical industries78. Silicon- and aluminum-based mixed oxides provide moderate and strong Brønsted acidity and are among the most popular solid acids used in current chemical processes79.…”

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confidence: 99%

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Brønsted acid sites based on penta-coordinated aluminum species

Wang¹,

Jiang²,

Lafon³

et al. 2016

Nat Commun

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118

144

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Zeolites and amorphous silica-alumina (ASA), which both provide Brønsted acid sites (BASs), are the most extensively used solid acid catalysts in the chemical industry. It is widely believed that BASs consist only of tetra-coordinated aluminum sites (AlIV) with bridging OH groups in zeolites or nearby silanols on ASA surfaces. Here we report the direct observation in ASA of a new type of BAS based on penta-coordinated aluminum species (AlV) by 27Al-{1H} dipolar-mediated correlation two-dimensional NMR experiments at high magnetic field under magic-angle spinning. Both BAS-AlIV and -AlV show a similar acidity to protonate probe molecular ammonia. The quantitative evaluation of 1H and 27Al sites demonstrates that BAS-AlV co-exists with BAS-AlIV rather than replaces it, which opens new avenues for strongly enhancing the acidity of these popular solid acids.

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Section: Resultsmentioning

confidence: 77%

mentioning

confidence: 99%

Brønsted acid sites based on penta-coordinated aluminum species

Wang¹,

Jiang²,

Lafon³

et al. 2016

Nat Commun

Self Cite

118

144

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show abstract

“…77 of the Pd-NPs supported on the silica-alumina as well as the EDX spectra of the material 77 are shown in Figure 11.12. The material was used as a catalyst for chemoselective hydrogenation of acetophenone under solvent-free conditions in a stirred autoclave at 50 bar pressure.…”

Section: Hydrogenation Of Aromatic Compoundsmentioning

confidence: 99%

“…STM images of the Pd-NPs supported on silica-alumina as well as EDX spectra of these nanoparticles 77. (Reproduced with permission, Copyright Elsevier.…”

mentioning

confidence: 99%

Nanocatalysts for Hydrogenation Reactions

Narayanan

2013

Nanocatalysis Synthesis and Applications

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“…Flame spray pyrolysis (FSP) method is very flexible to produce various nanoparticles with properties not easy accessible with another method and allow the use of a wide range of precursor, solvents, and process conditions [9][10][11][12][13]. Flame-made nanomaterials find application in many catalytic reactions such as oxidation, photocatalytic degradation [14], lean-NO x storage reduction [15], hydrogenation [13,[16][17][18], and dehydrogenation [19,20].…”

Section: Introductionmentioning

confidence: 99%