Direct synthesis of Pd incorporated in mesoporous silica for solvent-free selective hydrogenation of chloronitrobenzenes

Supported Palladium Nanocatalysts: Recent Findings in Hydrogenation Reactions

“…Their well-ordered channel structures presenting tunable porosity over a wide range and the abundancy of surface silanol groups facilitates its covalently mediated functionalization, thus, stabilizing the resulting MNPs. The potentialities of mesoporous silicas (MS) as supports in numerous reactions, as hydrogenation, alkylation, and oxidation of several substrates have been widely acknowledged [7,30,38]. Common approaches for the immobilization of MNPs into MS include methods as solution infiltration and incipient wetness impregnation lack, however, control growth of MNPs.…”

“…The influence of a structure-directing agent, 1,3,5-trimethylbenzene (TMB) on the in-situ incorporation of PdNPs within MS was explored by Yu and colleagues [38]. Pd-MS catalysts were synthesized, with and without the addition of TMB, by the direct synthesis method with Pd incorporated in MS, under basic conditions (Figure 3).…”

“…Table 1. Textural properties of the Pd-MS catalysts and catalytic data for the solvent-free hydrogenation of p-chloronitrobenzene (p-CNB) [38].…”

Mesoporous Silica‐Encaged Ultrafine Bimetallic Nanocatalysts for CO2 Hydrogenation to Formates

“…Mesoporous silica nanospheres (MSNs) is regarded as promising support for the confined synthesis of small MNPs due to their well-defined channels, large surface area and pore volume, and high thermal and chemical stability. [32][33][34][35][36][37][38][39][40] Conventionally, the metal species were introduced to the MSNs via an incipient wetness impregnation method, but it often suffers from the formation of large MNPs with non-uniform dispersion. [41,42] Post-modifying the MSNs with functional groups is an alternative approach to stabilize the small-sized MNPs, but it is usually subjected to intricate steps and increased the cost.…”

Hydrogenation of m-Chloronitrobenzene over Different Morphologies Ni/TiO2 without Addition of Molecular Hydrogen

“…Armatic haloamines are important intermediates in the synthesis of various organic compounds, such as dyes, drugs, and pesticides [1]. The reduction reaction of chloronitrobenzene (CNB) for the preparation of chloroaniline (CAN) (Scheme S1) can be divided into iron powder reduction [2], alcali sulphide [3] or hydrazine hydrate reduction [4], electrochemical reduction [5] and catalytic hydrogenation [6][7][8][9][10]. In particular, catalytic hydrogenation featured by environmental friendly, atom economy, high product purity and high yield is the most promising clean technique in the industry.…”