SBA-15 Supported Cesium Catalyst for Methyl Methacrylate Synthesis via Condensation of Methyl Propionate with Formaldehyde

Abstract

SBA-15 supported metal-doped cesium ion catalysts were prepared by the impregnation method and characterized by N 2 adsorption−desorption, XRD, FT-IR, and SEM and TEM. The characterization results indicated that the ordered hexagonal mesoporous structure of the support remained intact after incorporating cesium. Stepwise TPD of NH 3 and CO 2 was used to estimate the strength and the number of surface acid and base sites, respectively. The effects of Cs-loading, sources of cesium cation, and template concentration on the physicochemical properties and catalytic performance were investigated. The catalytic performance was evaluated by the gas-phase condensation reaction of methyl propionate with formaldehyde in a fixed-bed reactor. Compared with the amorphous SiO 2 catalyst, at similar Cs loading (ca. 15 wt %) SBA-15 catalyst exhibited better selectivity and yield.

Vapor phase condensation of methyl acetate with formaldehyde to preparing methyl acrylate over cesium supported SBA-15 catalyst

“…17 An alternative route to methyl acrylate is the oxidation of 18 propylene or propane [2-8] for the commercialized process. The 19 oxidation step involves the oxidation of propylene or propane to 20 acrolein over mixed metal oxides of Mo-Bi; the next step in this 21 process involves the oxidation of acrolein to acrylic acid over 22 mixed metal oxides of Mo-V. The esterification of acrylic acid with 23 methanol then leads to methyl acrylate.…”

“…It is obvious that the condensation reaction of 41 methyl acetate with formaldehyde to fabricate methyl acrylate is 42 still in a trail period, and there are many problems that must be 43 solved, such as low catalytic activity, selectivity, stability and so on. 44 Despite a lack of reports on the preparation of methyl acrylate, a 45 large number of papers [14][15][16][17][18][19][20][21] relating to the fabrication of 46 methyl methacrylate via the condensation of propionic acid 47 derivatives with formaldehyde have been published. Both 48 acid and base catalysts are known to be active in the reaction.…”

The study of technological and kinetic regularities of simultaneous methacrylates obtaining over zirconium-containing catalysts

“…Серед публікацій останніх років є роботи, які по-казують, що ефективним промотором каталізаторів процесу конденсації МП з ФА є оксид цирконію [9,10]. Зокрема, додавання цирконію підвищувало селектив-ність утворення ненасиченого естеру [9].…”

“…Зокрема, додавання цирконію підвищувало селектив-ність утворення ненасиченого естеру [9]. Тому в даній роботі вирішено використати саме оксид цирконію як промотор для підвищення селективності каталізатора на основі суміші оксидів бору та фосфору, нанесених на силікагель.…”

Modeling and optimization of cationic dye adsorption onto modified SBA-15 by application of response surface methodology

“…1(b). As could be seen, the SBA-15 silica displayed curved faceted and smooth rods based on elongated wheat-like macrostructures in SEM images with relatively uniform sizes of 1 μm [15,20]. The textural properties derived from BET surface area and BJH pore size distribution method were summarized in Table 3.…”