Selective Surface Functionalization and Metal Deposition in the Micropores of Mesoporous Silica SBA-15

Abstract

A procedure for the selective surface functionalization of the mesopores and micropores of mesoporous silica SBA-15 has been developed. The resulting bifunctional material has been used to incorporate Pd nanoparticles in the micropores. The method described provides a general route for creating different local environments within the nanometer-sized pore structure and for the selective deposition of guest species in the micropores of this type of bimodal porous materials.

One Pot Synthesis of Ultra-High Copper Contented Cu/SBA-15 Material as Excellent Catalyst in the Hydrogenation of Dimethyl Oxalate to Ethylene Glycol

“…With the increase of copper loaded into the channel of SBA-15, the pore size decreased from 6.0 to 3.8 and then to 2.4 nm. And the pore size ratio of 2.4-3.8 nm decreased dramatically from sample b to e, which may be ascribed to the fact that partial copper were loaded into the micropores of SBA-15 [21]. However, too much copper content (60%) as in sample e leaded to the disappearance of the 2.4 nm pores.…”

Swelling‐Agent‐Free Synthesis of Siliceous and Functional Mesocellular Foam‐Like Mesophases by Using a Carboxy‐Terminated Triblock Copolymer

“…[35,36] However, to our best knowledge, the herein disclosed endgroup effects on the soft-templating syntheses of mesostructured silica materials has never been observed before. The structural properties of the MCF-like silica mesophases can be further tailored by post-synthesis treatments, [37][38][39][40][41][42][43][44] and the silica materials have also been used as hard templates to prepare MCF-like carbon materials via a nanocasting route. Furthermore, the swelling-agent-free synthesis using P123-COOH is found to be less sensitive to the presence of organosilanes in the synthesis mixture and has been successfully applied for the cocondensation syntheses of functional MCF-like materials with carboxyethyl, iodopropyl, or mercaptopropyl groups.…”

Strukturierung fester Katalysatoren bis hinab zur atomaren Skala: Wo liegen die Grenzen?

“…Ansätze, dies zu erreichen, beruhen auf einer Reihe von verschiedenen Konzepten, wie reversibler Schutz eines Teils des Feststoffes, [28] Nanocasting unter Verwendung von Opfertemplaten [29] oder flächendeckende kontrollierte Modifikation von Oberflächen. [30] Mithilfe solcher Methoden haben wir Partikel in thermisch stabilen Hohlkugeln deponiert, wodurch Sintern unterdrückt wird (Abbildung 4), [31] oder die Mesoporen und Mikroporen von geordnetem mesoporçsem SBA-15 unterschiedlich funktionalisiert, um die Bedeutung der sauren Zentren in verschiedenen Umgebungen aufzuklären. [32] CMK-5, ein geordneter mesoporçser Kohlenstoff aus hexagonal gepackten Kohlenstoffrçhren, scheint ein ideales Substrat für solche Ansätze zu sein, da die Poren innerhalb der Kohlenstoffrçhren und die Poren zwischen den Rçhren in getrennten Schritten gebildet werden, sodass es mçglich sein sollte, sie voneinander unabhängig zu funktionalisieren.…”