CO oxidation catalyzed by gold nanoparticles confined in mesoporous aluminosilicate Al-SBA-15: Pretreatment methods

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

“…Chiang et al [201,202] incorporated AuNPs over an acidic Al-SBA-15 thin film supports, prepared by mixing pluronic P123 with sodium aluminate in water, followed by the addition of a surfactant mixture solution including CTABr and SDS. The pH and temperature of this mixture were adjusted in the range of 5-6, and 40-50 °C, respectively.…”

“…Moreover, it was reported that most of the Al was present in the tetrahedral framework well-dispersed site, which contributed not only to generate acidity, but also to limit the Au particle size. In an attempt to elucidate the effects of different aluminosilicate supports, the same authors prepared Au supported on Al-SBA-15 thin films and on Al-SBA-15 normal form (Au loading of ~17%wt), using APS and MPS as functionalizing agents [202]. After H 2 reduction at 600 °C, the size of AuNPs was almost similar for all the supports (~3.0 nm).…”

Catalysis by gold: New insights into the support effect

“…In order to enhance the metal-support interaction and anchor GNPs on the surface, as shown in Fig. 3, we functionalized the surface of SiO 2 with SH (HS(CH 2 ) 3 Si(OCH 3 ) 3 , MPTS) and NH 2 (H 2 N(CH 2 ) 3 Si(OCH 3 ) 3 , APTS) [119][120][121], and then reduced the gold precursor by aqueous NaBH 4 . This method was more efficient in controlling the size of GNPs than the one-pot synthesis method.…”

Designer Nanomaterials for the Production of Energy and High Value‐Added Chemicals

“…The resulting metal salt solution is then added to the porous support filling its pores so that a thick paste is formed. The solvent is then removed in a rotary evaporator and the final solid is oven dried and subsequently calcined and reduced (if needed) before being tested as a catalyst [14,36]. SMNPs obtained by this methodology have been reported to have various loadings, being differently dispersed depending on the metal, support, and loading of the final solid [14,36,37].…”