A Brief Overview of Recent Progress in Porous Silica as Catalyst Supports

Abstract

Porous silica particles have shown applications in various technological fields including their use as catalyst supports in heterogeneous catalysis. The mesoporous silica particles have ordered porosity, high surface area, and good chemical stability. These interesting structural or textural properties make porous silica an attractive material for use as catalyst supports in various heterogeneous catalysis reactions. The colloidal nature of the porous silica particles is highly useful in catalytic applications as it guarantees better mass transfer properties and uniform distribution of the various metal or metal oxide nanocatalysts in solution. The catalysts show high activity, low degree of metal leaching, and ease in recycling when supported or immobilized on porous silica-based materials. In this overview, we have pointed out the importance of porous silica as catalyst supports. A variety of chemical reactions catalyzed by different catalysts loaded or embedded in porous silica supports are studied. The latest reports from the literature about the use of porous silica-based materials as catalyst supports are listed and analyzed. The new and continued trends are discussed with examples.

Effect of Different Pre-Treatment on the Microstructure and Intumescent Properties of Rice Husk Ash-Based Geopolymer Hybrid Coating

“…The thermal properties of the formulated GB are highly influenced by the SiO 2 content of RHA and the form of silica. Amorphous form silica has a uniform pore structure, large specific surface area and higher porosity than other inorganic particles, which makes it possess good absorption and catalysis properties [ 34 ]. Even though sample S5 possessed the lowest silica content from XRF analysis, the XRD measurement revealed that the incineration period and temperature caused the phase of RHA to transform from amorphous to crystalline.…”

A comprehensive review on the synthesis techniques of porous materials for gas separation and catalysis

“…[140] In reference to the success, solid base catalysts were expanded in various laboratory-scale and commercial processes (refer Table 3). Several metal oxides-based F I G U R E 1 6 Categorically divided reactions catalyzed by mesoporous materials T A B L E 1 Comparison of properties and functionalization of various mesoporous catalysts [110] Name mesoporous materials have been reported to show basic properties and activities for various types of base catalyzed reactions, and the pre-treatment occurred at high temperatures (refer Table 4).…”

Recent Advances in Synthesis of Pyrazole Derivatives using Functionalized Catalysts Immobilized on Silica

“…[4] Specially, mesoporous silica has been widely used as catalyst support in heterogeneous catalysis. [5] The silica supported catalysts have shown high catalytic activity, easy recycling capability, low degree of metal leaching etc. SFMs have shown great potential as catalyst in various organic transformations/reactions such as acetylation, anomeric deacetylation, hydration, cyclization, glycosylation, isomerization, geminal diacylation of aldehydes, oxidation, debenzoylation, Knoevenagel condensation, Hantzsch reaction, Friedländer condensation, and Michael addition have been successfully catalyzed by such catalysts.…”