Article: Two-step preparation of Keggin-PW₁₂@UIO-66 composite showing high-activity and long-life conversion of soybean oil into biodiesel
RSC advances. 2021 Nov. 25, v. 11, no. 60
2021
Abstract: A polyoxometalate acid can be encapsulated into a metal–organic framework to construct a novel kind of solid-acid catalyst. In this work, the two-step method —high-temperature preparation of Zr₆O₄(OH)₄(CH₃COO)₁₂ and low-temperature self-assembly—has been ...
| Abstract | A polyoxometalate acid can be encapsulated into a metal–organic framework to construct a novel kind of solid-acid catalyst. In this work, the two-step method —high-temperature preparation of Zr₆O₄(OH)₄(CH₃COO)₁₂ and low-temperature self-assembly—has been adopted to synthesize the PW₁₂@UIO-66 composite (PW₁₂ = H₃PW₁₂O₄₀; UIO-66 = Zr₆O₄(OH)₄(OOC–C₆H₄–COO)₁₂). The as-synthesized PW₁₂@UIO-66 composite exhibits highly crystalline, good octahedron morphology, large specific surface area (1960 m² g⁻¹) and high thermal stability (>500 °C), which clearly demonstrates the potential as a solid-acid catalyst. Additionally, the PW₁₂@UIO-66 composite may be accomplished with 85% utilization of H₃PW₁₂O₄₀ and 95% yield through this synthetic procedure. The performances of the PW₁₂@UIO-66 composite are investigated by catalyzing the simultaneous transesterification and esterification of soybean oil into biodiesel. Under the optimal conditions, the conversion of the soybean oil into biodiesel would exceed 90% over the as-synthesized PW₁₂@UIO-66 composite. As the crucial indexes for industrial prospects, the recycling and life experiments were surveyed. After 10 times recycling and 4 weeks, the structure and performance of the PW₁₂@UIO-66 composite remained unchanged and in the meantime the PW₁₂@UIO-66 composite still maintained a high activity to convert soybean oil into biodiesel. |
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| Keywords | biodiesel ; catalysts ; coordination polymers ; esterification ; soybean oil ; surface area ; thermal stability ; transesterification |
| Language | English |
| Dates of publication | 2021-1125 |
| Size | p. 38016-38025. |
| Publishing place | The Royal Society of Chemistry |
| Document type | Article |
| ISSN | 2046-2069 |
| DOI | 10.1039/d1ra06211e |
| Database | NAL-Catalogue (AGRICOLA) |
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