首页|(NH4)Cu_(0.2)H_(2.8)PMonVO_(40)via a hydrothermal homogeneous precipitation method for selective oxidation of methacrolein to methacrylic acid
(NH4)Cu_(0.2)H_(2.8)PMonVO_(40)via a hydrothermal homogeneous precipitation method for selective oxidation of methacrolein to methacrylic acid
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NSTL
A strategy combing homogeneous precipitation and hydrothermal treatment was proposed to prepare Keggin-type(NH4)Cu_(0.2)H_(2.8)PMonVO_(40)for selective oxidation of methacrolein(MAL)to methacrylic acid(MAA).The effects of the preparation conditions on the catalyst properties and catalytic performance were investigated.Compared with traditional precipitation,homogeneous precipitation could provide a homogenized supersatu-ration for crystal initial nucleation,while the subsequent hydrothermal treatment process under high pressure could promote crystal led self-assembly growth of rectangular sediments.Benefiting from the advantages of this new method,the as-prepared(NH4)Cu_(0.2)H_(2.8)PMonVO_(40)with high surface area and regular morphology had a large number of active species(VO~(2+))and acidic sites,thereby enhancing the catalytic performance of the catalyst.The MAL conversion and MAA selectivity over the optimum catalysts prepared at the hydrothermal temperature of 120 ℃ and for a time of 4 h reached above 80%.It is believed that this work offers a new strategy for the preparation of an effective catalyst for the oxidadon reaction.
NSTL
