催化作用
双金属片
萘
吡啶
物理吸附
贵金属
化学
吸附
无机化学
二苯并噻吩
选择性
介孔材料
核化学
材料科学
物理化学
有机化学
作者
Jorge Saldarriaga Escobar,J.A. Colín-Luna,María C. Barrera
标识
DOI:10.1021/acs.iecr.3c02359
摘要
Al-modified (chemical grafting) SBA-15 (SiO2/Al2O3 = 5 mass ratio) materials were used as noble metal (NM, monometallic Pt or Pd and bimetallic Pd/Pt = 4, 0.5 wt % loading) carriers. The materials were studied by XRF, N2 physisorption, XRD, TPR, pyridine thermodesorption FTIR, and STEM (HAADF). Hydrogenating properties were tested in naphthalene (N) conversion; meanwhile, dibenzothiophene (80 ppm) was added in some experiments to evaluate the thioresistance of prepared catalysts. Al-incorporation provided enhanced Lewis and Brønsted acidity to pristine SBA-15 due to alumina-like domains that contributed to Pt dispersion reflected in augmented hydrogenation. The Pt-based catalyst was the most active in N saturation (T = 290 °C, P = 6.97 MPa), whereas the Pd/Pt (4/1) formulation had enhanced thioresistance probably due to NM alloying (electron transfer in Pt-Pd core–shell particles) in conjunction with weak Brønsted acidity (Si–O–Al bonds, electron transfer from NM) that provided additional sites for aromatic adsorption. Enhanced thioresistance is crucial for aromatic saturation of NM catalysts aimed at second-stage polishing of ultralow S diesel.
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