Catalytic oxidation of styrene over Cu-doped hydrotalcites

A novel magnetic layered double hydroxide as potent mesoporous recyclable heterogeneous nanocatalyst for the synthesis of 1H‐chromeno[2,3‐b]pyridine‐3‐carbonitrile derivatives

“…In addition, the diffraction peaks shown at 2 θ = 11°, 23°, 35°, 53°, and 63° are related to hydrotalcite‐like structure. [ 59,62–64 ] These XRD results revealed the successful immobilization of PCE cobalt complex on γ ‐Fe 2 O 3 @Cu 3 Al‐LDH NPs to produce γ ‐Fe 2 O 3 @Cu 3 Al‐LDH/PCE‐Co nanocomposite. In addition, the exact similarity between the XRD pattern of the recycled catalyst (Figure 2b) and that of the authentic catalyst (Figure 2a) confirms that the crystalline nature the catalyst remains intact after the reaction.…”

Efficient Selective Oxidation of 5-Hydroxymethylfurfural with Oxygen over a ZnCrAl Mixed Oxide Catalyst Derived from Hydrotalcite-like Precursor

“…The morphologies of Zn 0.75 CrAl- x and Zn 0.75 CrAl- x -c are examined with the SEM technique. Figure a,c shows that both samples Zn 0.75 CrAl-6 and Zn 0.75 CrAl-9 before calcination are composed of platelet-like agglomerated crystals, which represent the characteristics of layered clay materials. , Compared to Zn 0.75 CrAl-9, the structure of Zn 0.75 CrAl-6 becomes fluffier, which makes it have a larger external surface area . After calcination at 460 °C, the hydrotalcite structure collapses and both the samples become flocculent (Figure b,d)…”

2-Methylimidazole-Assisted Synthesis of Nanosized Cu3(BTC)2 for Controlling the Selectivity of the Catalytic Oxidation of Styrene

“…The selective oxidation of styrene is an important transformation in the fine chemical industry because the oxidation products (benzaldehyde, benzoic acid, and styrene epoxide) are critical chemical intermediates to synthesize some value-added fine and bulk chemicals, such as perfumes, pharmaceuticals, dyes, and the rubber auxiliary and fine chemicals industry. − A number of transition-metal catalysts have been developed for the oxidation of styrene to benzaldehyde or styrene epoxide, − but relatively very few studies had their focus on acid compounds as the main product. Besides, current research is aimed at obtaining only one desired product, − although there are also a few reports on the adjustment of the main products of styrene oxidation to obtain benzaldehyde and styrene epoxide. − Likewise, there are few reports on control of the selectivity of benzaldehyde and benzoic acid by adjusting the variable factors, i.e., reaction temperature, initial volume ratio of the solvent, and catalyst amount .…”

“…Besides, current research is aimed at obtaining only one desired product, − although there are also a few reports on the adjustment of the main products of styrene oxidation to obtain benzaldehyde and styrene epoxide. − Likewise, there are few reports on control of the selectivity of benzaldehyde and benzoic acid by adjusting the variable factors, i.e., reaction temperature, initial volume ratio of the solvent, and catalyst amount . However, some of these reported methods still suffered from precious metal catalysis, ,− poor selectivity and conversion, ,− and the use of a large amount of volatile organic solvents. ,,,,,, Considering the economic and environmental facts, the selective oxidation of styrene to benzaldehyde and benzoic acid, respectively, by controlling the reaction conditions using a heterogeneous catalyst might be a desirable process.…”