Sulfonic acid functionalised SBA-15 as catalysts for Beckmann rearrangement and esterification reaction

Abstract

Hybrid inorganic-organic solid acid materials SBA-15-Ph-SO 3 H were synthesized by the directly cocondensation method under the acid medium. The resulting materials perform well both in the liquid phase Beckmann rearrangement (The yield is 32.3%) and esterification reaction (The yield is 95.5%). And more, the catalysts show the different catalytic performance in these two reactions.

Infrared investigations of arenesulfonic modified mesoporous materials by the use of complementary probes

“…In most of the cases [20,22], TEOS is added to the acidic solution of the templating agent (Pluronic P123) and the precursor of the sulfonic group introduced later. We showed earlier [51][52][53] that mesoporous materials with rather good textural parameters are also obtained when TEOS is pre-hydrolysed in the absence of Pluronic P123. The specific surfaces and pore volumes of the resulting solids, SBA(R), decrease from 850 m 2 g -1 and 1.05 cm 3 g -1 (R = 0.05) to 470 m 2 g -1 and 0.4 cm 3 g -1 (R = 0.20) with increasing amounts of CSPTMS in the synthesis gel [53].…”

“…Indeed CSPTMS molecules added in high quantity may behave like co-surfactants and modify the assembly of Pluronic P123 or self-organise thus leading to pores with smaller dimensions [28]. Nevertheless, it has been shown earlier that all the SBA(R) solids are efficient acid catalysts for the esterification of acetic acid [52] and for the Beckmann rearrangement of cyclohexanone oxime [53].…”

“…Arenesulfonic-functionalised mesoporous silica samples were prepared according to a one-pot synthesis procedure [52,53] as follows: 4.0 g of Pluronic 123 [(EO) 20 (PO) 70 (EO) 20 , Aldrich] were dissolved in 125 mL of a 2 M hydrochloric acid solution. The mixture (solution A) was stirred at 313 K till the complete dissolution of the surfactant.…”

Alternative fuel additives from glycerol by etherification with isobutene: Structure–performance relationships in solid catalysts

“…Sulfonic acid functionalized SBA-15 was synthesized as proposed by Zhao et al, by direct cocondensation in an acidic medium by using SiO 2 , CSPTMS, HCl, and H 2 O with a ratio of 1.2:0.2:6.5:180 [135], in which the sulfonation step employed refluxing with conventional or microwave heating (SBA-15-CS and SBA-15-MwS). Both SBA-15-CS and SBA-15-MwS were observed to show better glycerol conversion and selectivities towards DTBG and TTBG when compared to pure SBA-15, mainly because of increasing the amount of Brønsted acid sites, although there were declines in the surface area and pore volume for modified catalysts.…”

Sulfonic acid-functionalized mesoporous silica (SBA-Pr-SO3H) as solid acid catalyst in organic reactions

“…For example, esterification of caprylic acid with ethanol [63], glycerol with oleic acid [64], glycerol with lauric acid towards monoglyceride [65][66][67], levulinic acid with different alcohols [68], and acetic acid with methanol [69,70] A c c e p t e d M a n u s c r i p t 10 these materials are active for these reactions indicates that they have strong acidity. It was found that the activity of sulfonic acid hybrid silica used as catalysts for transesterification reactions depended on the morphology of the silica and also on the preparation procedure [71].…”