Abstract
A series of SAPO-11 molecular sieves with hierarchical structure (Meso-SAPO-11) were synthesized by adding certain amount of carbon particles. The co-existing micropore and mesopore feature of Meso-SAPO-11 was confirmed by N2 adsorption–desorption isotherm, TEM and SEM. XRD, TEM, SEM and Py-FTIR were employed to examine the crystallization, morphology and acidity properties of the resulting meso-SAPO-11 prepared from two typical kinds of carbon material and different contents of template. The hydroisomerization performance of meso-SAPO-11 as catalyst support and acid active site, with loading 0.5 wt% Pt as metal active site, was also tested to evaluate the mesoporous effects on catalytic activity and product selectivity.
Highlights
With the environmental regulations becoming more stringent and people’s environmental awareness getting stronger, the demand for clean production of gasoline, diesel and lubricants and other products from crude oil is increasing
The acid function is usually provided by acidic support, such as amorphous oxide or oxide mixture (Al2O3, SiO2–Al2O3, ZrO2/SO42- treated by HF) [2, 3], aluminosilicate molecular sieves (Y, Beta, Mordenite, ZSM-5, ZSM-22) [4,5,6], or silicoaluminophosphate molecular sieves (SAPO-11, SAPO-31, SAPO-41) [7,8,9,10]
The amount of carbon templates was determined by 5 wt% weight ratios of those to theoretical yield of SAPO-11
Summary
With the environmental regulations becoming more stringent and people’s environmental awareness getting stronger, the demand for clean production of gasoline, diesel and lubricants and other products from crude oil is increasing. Because of that crude oil is becoming heavier and poorer in quality, the deep upgrading and full utility of heavy oil attract extensive attention and become more of a disposal challenge. Hydroisomerization, as a technology to produce higher quality petroleum products, is getting more and more attentions. In the production of gasoline, the octane number of the product can be improved by hydroisomerization. In the production of diesel and lubricants, the pour point and viscosity nature of the product can be ameliorated by hydroisomerization, while maintaining the efficiency of carbon conversion and yield target oil product for maximum [1]. The acid function is usually provided by acidic support, such as amorphous oxide or oxide mixture (Al2O3, SiO2–Al2O3, ZrO2/SO42- treated by HF) [2, 3], aluminosilicate molecular sieves (Y, Beta, Mordenite, ZSM-5, ZSM-22) [4,5,6], or silicoaluminophosphate molecular sieves (SAPO-11, SAPO-31, SAPO-41) [7,8,9,10]
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