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High activity of aluminated bifunctional mesoporous silica nanoparticles for cumene hydrocracking and measurement of molar absorption coefficient
Sazegar M.R.a,b, Triwahyono S.b, Jalil A.A.b, Mukti R.R.c, Mohaghegh S.M.S.d,e, Aziz M.b
a Dept. of Chemistry, Fac. of Science, North Tehran Branch, Islamic Azad University, Tehran, Iran
b Dept. of Chemistry, Fac. of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru Johor, Malaysia
c Division of Inorganic and Physical Chemistry, Fac. of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
d Dept. of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Canada
e Dept. of Polymer Science, Iran Polymer and Petrochemical Institute, Tehran, Iran
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.Bifunctional mesoporous silica nanomaterials (MSN) with various Si/Al molar ratios of 7, 10, 20 and 50 in platinum supported (Pt/HAlMSN) were synthesized using sol-gel methods followed by post-synthesis methods. XRD and nitrogen sorption results confirmed the mesoporous structure with surface areas of 537-775 m2 g-1. 27Al NMR spectroscopy confirmed aluminium loading with tetrahedral, pentahedral and octahedral structures. Pyridine adsorption IR results indicated that incorporation of aluminium led to the generation of strong Brønsted and Lewis acidic sites. Catalytic activity was investigated for cumene hydrocracking in a pulse microcatalytic reactor in the temperature range of 323-573 K which revealed that this activity depends on the number of Lewis and Brønsted sites. The high yield of cumene conversion increased from Si/Al molar ratios of 50 to 10 and decreased for the Si/Al molar ratio of 7 due to the presence of pentahedral Al and/or inactive tetrahedral Al atoms in Pt/HAlMSN-7. The high selectivity of α-methylstyrene showed the important role of Lewis acid sites in these bifunctional catalysts. In spite of the coke formation in the Pt/HAlMSN catalysts, reactivation recovered the activity of the catalysts after 100 h of reaction. The molar absorption coefficients of Pt/HAlMSN were measured using pyridine followed by water adsorption monitored by FTIR.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1039/c5nj01433f[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]