Highly efficient acrylic acid production from formaldehyde and acetic acid over the NASICON-type catalyst

Abstract

The condensation of formaldehyde and acetic acid to acrylic acid is considered as one of the important ways for the clean and high value utilization of coal-based methanol derivatives. Herein,...

Highly efficient production of 2,3-pentanedione from condensation of bio-derived lactic acid over polymorphic ZrO2

“…Earlier literature findings have suggested that BAS and LAS coexisting could effectively boost the condensation reaction. 52,53 Furthermore, the B/L ratio indicates that polymorphic ZrO 2 has more LAS, which increases the condensation rate and second reduction process in comparison with the commercial ZrO 2 (Table 2). When the acidity and basicity of the catalyst are considered together to correlate with the catalyst performance, it is shown that higher concentrations of medium acidic and basic sites of the polymorphic ZrO 2 are more selective for condensation than for dehydration or reduction.…”

Preparation of Methyl Acrylate through Catalytic Aldol Condensation over Cs/TS-1 Catalysts

“…As versatile resin monomers, methyl acrylate (MA) and acrylic acid (AA) are widely used for the production of polymers, rubbers, adhesives, and plastics. − Currently, nearly most of the MA is manufactured industrially from hydrolysis of acrylonitrile and oxidation of propylene (Scheme ). , The hydrolysis of the acrylonitrile process relies on excessive toxic hydrogen cyanide with large amounts of sulfuric acids as raw materials, leading to environmental pollution as well as a large amount of the low-valuable NH 4 HSO 4 , which has been gradually replaced by the two-step oxidation of propylene.…”

“…Properties of Supports. To understand the properties of supports and their effects on Cs sites better, 29 Si solid-state MAS NMR and IR−OH spectroscopy were measured (Figures intensity between −103 and −113 ppm (defined as Q 3 /Q 4 ) is directly relevant with the content of Si−OH groups. 45,47 According to Table S1, Q 3 disappeared after introduction of Cs species.…”

Acid Promoter-Modified Cs/Al2O3 Catalyst for Methyl Methacrylate Production by Aldol Condensation of Methyl Propionate with Formaldehyde

“…The selectivity of crotonaldehyde was increased to 80.4% after doping with Cu, which is much higher than that catalyzed by the primary MgAlO oxide. Gao et al synthesized NASICON catalysts for the aldol condensation of acrylic acid and revealed that the space-time yield of acrylic acid and methyl acrylate can be up to 123.9 μmol·g –1 ·min –1 . This is mainly owing to the synergistic impact of acid and base sites .…”