Vanadium Phosphorus Oxide/Siliceous Mesostructured Cellular Foams: efficient and selective for sustainable acrylic acid production via condensation route

Abstract

A new type of supported vanadium phosphorus oxide (VPO) with self-phase regulation was simply fabricated (organic solvent free) for the first time by depositing the specific VPO precursor NH4(VO2)HPO4 onto the Siliceous Mesostructured Cellular Foams (MCF) with controlled activation. The resulting materials were found to be highly efficient and selective for sustainable acrylic acid (AA) plus methyl acrylate (MA) production via a condensation route between acetic acid (HAc) and formaldehyde (HCHO). A (AA + MA) yield of 83.7% (HCHO input-based) or a (AA + MA) selectivity of 81.7% (converted HAc-based) are achievable at 360 °C. The systematic characterizations and evaluations demonstrate a unique surface regulation occurring between the MCF and the NH4(VO2)HPO4 precursor. NH3 release upon activation of NH4(VO2)HPO4 precursor together with adsorption of NH3 by MCF automatically induces partial reduction of V5+ whose content is fine-tunable by the VPO loading. Such a functionalization simultaneously modifies phase constitution and surface acidity/basicity of catalyst, hence readily controls catalytic performance.

High-efficiency and durable V–Ti–Nb ternary catalyst prepared by a wet-solid mechanochemical method for sustainably producing acrylic acid via acetic acid–formaldehyde condensation

“…8, the catalyst VTi-Nb showed the highest HAc conversion (27.4%), followed by VTi-Mo, VTi-W, and VTi-Bi, in order with the medium acid site density. However, unlike previous reports, 25,40 the (MA + AA) selectivity was out of order with the medium base site density order. The highest (MA + AA) selectivity (92.3%) occurred in catalyst VTi-Mo, rather than catalyst VTi-Nb.…”

“…Furthermore, the (MA + AA) selectivity reached 92.3%, far surpassing previous studies. 16,22,25,40 Thus, the HAc conversion did not decrease due to the increased LHSV under the catalyst VTi–Nb, indicating that the addition of Nb 2 O 5 enhanced the active site density as well as the catalytic efficiency.…”

“…It had been reported that the (MA + AA) selectivity (HAc-based) for ordinary VPOs catalysts was extremely consistent with the P/V ratio and medium base site density. 3,16,25,40…”

Polymers without Petrochemicals: Sustainable Routes to Conventional Monomers

“…Liu and co-workers investigated a VPO catalyst supported on a siliceous mesostructured cellular foam (MCF). 326 The V 5+ /V 4+ ratio of the catalyst was tunable by the VPO loading, while during the catalyst synthesis, ammonia was used to induce a partial reduction of V 5+ . Using this catalyst, the combined yield of acrylic acid and methyl acrylate was 84% at a reaction temperature of 360 °C.…”

“…The addition of metal cations increased the V 5+ /V 4+ ratio which promoted a higher catalytic performance. Liu and co-workers investigated a VPO catalyst supported on a siliceous mesostructured cellular foam (MCF) . The V 5+ /V 4+ ratio of the catalyst was tunable by the VPO loading, while during the catalyst synthesis, ammonia was used to induce a partial reduction of V 5+ .…”