2024 : 4 : 14
Mohammad Yaser Masoomi

Mohammad Yaser Masoomi

Academic rank: Assistant Professor
ORCID: https://orcid.org/0000-0003-1329-5947
Education: PhD.
ScopusId: 36927960900
Faculty: Science
Address: Arak University
Phone:

Research

Title
Quasi-HKUST Prepared via Postsynthetic Defect Engineering for Highly Improved Catalytic Conversion of 4 ‑Nitrophenol
Type
JournalPaper
Keywords
heterogeneous catalysis، metal− organic frameworks، defect engineering، partial ligand removal، 4-nitrophenol reduction
Year
2022
Journal ACS Applied Materials & Interfaces
DOI
Researchers mino baghery ، Arianna Melillo ، Belen Ferrer ، Mohammad Yaser Masoomi ، Hermenegildo Garcia

Abstract

HKUST-1 [Cu3 (BTC)2 (H2O)3 ]n· nH 2 OMeOH was submitted to thermolysis under controlled conditions at temperatures between 100 and 300 ° C. This treatment resulted in partial ligand decarboxylation, generating coordinatively unsaturated Cu 2+ sites with extra porosity on the way to the transformation of the initial HKUST-1 framework to CuO. The obtained materials retaining in part the HKUST-1 original crystal structure (quasi-MOFs) were used to promote 4-nitrophenol conversion to 4-aminophenol. Because of the partial linker decomposition, the quasi-MOF treated at 240 °C contains coordinatively unsaturated Cu2+ ions distributed throughout the Q-HKUST lattice together with micro- and mesopores. These defects explain the excellent catalytic performance of QH-240 with an apparent rate constant of 1.02 × 10 − 2 s − 1 in excess of NaBH4 and an activity factor and half-life time of 51 s −1 g− 1 and 68 s, respectively, which is much better than that of the HKUST parent. Also, the induction period decreases from the order of minutes to seconds in the presence of the HKUST and QH-240 catalysts, respectively. Kinetic studies fit with the Langmuir − Hinshelwood theory in which both 4-nitrophenol and BH4 − should be adsorbed onto the catalyst surface. The values of the true rate constant (k ), the adsorption constants of 4-nitrophenol and BH4 − (K4 ‑NP and KBH4−), as well as the activation energy are in agreement with a rate-determining step involving the reduction of 4-nitrophenol by the surface-bound hydrogen species.