Study on Mesoporous Al-SBA-15 with Enhanced Acidity and Hydrothermal Stability for Heavy Oil Hydrocracking Conversion

Abstract

To increase heavy oil conversion by hydrocracking, the larger pore opening mesoporous materials with enhanced acidity and hydrothermal stability are required. A series of mesoporous Al-SBA-15 was studied in acid-free and different HCl concentration solutions with various initial SiO 2 /Al 2 O 3 molar ratio. The final product samples were characterized with N 2 adsorption, SAXS/XRD, NH 3-TPD, TEM, 28 Si NMR, and 27 Al NMR. The results concluded that the acid-free and weak acidic medium favor the formation of the Al-SBA-15 with better textual properties, higher acidity, and higher wall-thickness. A considerable amount of Al was present in the tetrahedral form.

Catalysts Based on Acidic SBA-15 for Deep Oxidative Desulfurization of Model Fuels

“…The spectrum of the sample shows peaks responsible for the tetra- (51.7) and octahedral (−0.7) environment of aluminum, which is consistent with the structure of aluminum-containing SBA-15 . The appearance of a band in the region of 25–30 ppm indicates the presence of pentacoordinate Al .…”

“…The spectrum of the sample shows peaks responsible for the tetra-(51.7) and octahedral (−0.7) environment of aluminum, which is consistent with the structure of aluminum-containing SBA-15. 43 The appearance of a band in the region of 25−30 ppm indicates the presence of pentacoordinate Al. 44 The tetrahedral environment explains the presence of strong Brønsted acid centers in this support, and the presence of an octahedral environment explains the acid centers.…”

Effect of Zeolite-Y Modification on Crude-Oil Direct Hydrocracking

“…Moreover, all of the data sets were identified and quantified (i.e., crystallinity percentage) by High Score Plus software combined with the ICDD PDF-4+ database of the standard reference materials . Additionally, the details of the small-angle X-ray scattering are given by Ding et al…”

“…Moreover, all of the data sets were identified and quantified (i.e., crystallinity percentage) by High Score Plus software combined with the ICDD PDF-4+ database of the standard reference materials. 16 Additionally, the details of the small-angle X-ray scattering are given by Ding et al 17 The silicon, aluminum, and sodium contents (wt %) in the samples were analyzed by the PANalytical AXIOS Advanced Wavelength-Dispersive X-ray fluorescence spectrometer. 16,18 The samples were manually ground to a fine powder and mixed thoroughly.…”