Topic
Phosphotungstic acid
About: Phosphotungstic acid is a research topic. Over the lifetime, 1925 publications have been published within this topic receiving 38059 citations. The topic is also known as: Phosphowolframic acid.
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TL;DR: In this paper, the electron transfer from Fe atom to PTA cluster and strong covalent metal support interactions (CMSI) between the Fe 3d orbitals and O 2p orbitals of PTA lay the foundation of high stability.
Abstract: Geometric and electronic structures of phosphotungstic acid (PTA) supported single transition metal atom (Fe, Co, Ni, Ru, Rh, Pd, Os, Ir and Pt) catalysts have been systematically investigated by using the first-principles theoretical methods. Possible reaction mechanism for ethylene epoxidation was explored. The most possible anchoring site for the single transition metal atom is the fourfold hollow site on PTA. As the non-noble metal Fe1-PTA system possesses considerable adsorption energies towards both O2 and C2H4, the strong bonding interaction between Fe1 and PTA cluster was analyzed. It is found that the electron transfers from Fe atom to PTA cluster and strong covalent metal-support interactions (CMSI) between the Fe 3d orbitals and O 2p orbitals of PTA lay the foundation of high stability. The proposed catalytic reaction mechanism for ethylene epoxidation on Fe1-PTA single-atom catalyst (SAC) includes three steps: the O2 adsorbs on Fe1-PTA via electron transfer; the first ethylene attacks the adsorbed O2 molecule on Fe1-PTA followed by the formation of C2H4O; finally, the O atom remained on Fe1-PTA reacts with a second ethylene to form the product and accomplish the catalytic cycle. The Fe1-PTA has high selectivity and catalytic activity for ethylene epoxidation via an Eley–Rideal mechanism with low energy barriers. A potentially competitive pathway for the formation of acetaldehyde is not kinetically favorable. These results provide insights for the development of highly efficient heterogeneous SACs for ethylene epoxidation with non-noble metals.
34 citations
TL;DR: In this paper, three environmentally friendly acid ionic liquids were selected to conduct the immobilization, i.e., 1-(3-sulfonate)-propyl-3-allylimidazolium hydrogen sulfate, trifluoromethane sulfonate and dihydrogen phosphotungstate ionic liquid.
34 citations
TL;DR: In this article, an ultra-high ion-selective Nafion composite membrane modified by phosphotungstic acid (PWA) coupled silica for vanadium redox flow battery (VRB) was constructed and prepared through solution casting.
34 citations
TL;DR: In this paper, hierarchical faujasite zeolite-supported heteropoly acid catalysts (HR/Y) were prepared followed by impregnation of 10, 20 and 30-wt% phosphotungstic acid (HPW).
34 citations
TL;DR: A layer-by-layer (LbL) film assembly was constructed that comprises alternative layers of poly(diphenylamine) (PDPA) and phosphotungstic acid (PTA).
Abstract: A layer-by-layer (LbL) film assembly was constructed that comprises alternative layers of poly(diphenylamine) (PDPA) and phosphotungstic acid (PTA). First, a layer of oxidized PDPA (referred to as PDPA(+)) was deposited by electropolymerization. Then, a layer of negatively charged PTA was deposited on the PDPA(+) layer . This processes was repeated several times to obtain multilayer LbL film (PDPA/PTA)n, where n is the number of double layers. The LbLs were characterized by UV-Vis spectroscopy, FT-IR spectroscopy and X- ray diffraction spectroscopy. The process of formation of the LbL assembly was monitored by electrochemical methods. Electrochemical studies revealed that this LbL film possesses a remarkable electrocatalytic activity towards oxidation of ascorbic acid in neutral aqueous medium. The enhanced electrocatalytic activity of (PDPA/PTA)n LbL film is attributed to the existence of tungsten atoms in the interlayers of PDPA.
34 citations