Direct syntheses of a promising industrial organic–inorganic hybrid silica containing methanesulphonate

Liu, Naiwang; Pu, Xin; Shi, Li

doi:10.1016/j.ces.2014.06.041

Cited by 17 publications

(10 citation statements)

References 49 publications

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“…Alkylation between aromatics and olefins. concentration in aromatic liquids (Scheme 1)[31] was employed to test the catalytic activity of SZ treated in different conditions. Alkylation was carried out in a fixed bed tubular micro-reactor equipped with a constant flow pump to enable precise flow rate and temperature control.…”

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confidence: 99%

Thermodynamic complexity of sulfated zirconia catalysts

Liu

Guo

Navrotsky

et al. 2016

Journal of Catalysis

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A series of sulfated zirconia (SZ) catalysts was synthesized by immersion of amorphous zirconium hydroxide in sulfuric acid of various concentrations (1 to 5 N). These samples were fully characterized by X-ray diffraction (XRD), thermogravimetric analysis and mass spectrometry (TGA-MS), and aqueous sulfuric acid immersion and high temperature oxide melt solution calorimetry. We investigated the enthalpies of the complex interactions between sulfur species and the zirconia surface (∆H sz) for the sulfated zirconia precursor (SZP), ranging from-109.46 ± 7.33 (1 N) to-42.50 ± 0.89 (4 N) kJ/mol S. ∆H sz appears to be a roughly exponential function of sulfuric acid concentration. On the other hand, the enthalpy of SZ formation (∆H f), becomes more exothermic linearly as sulfur surface coverage increases, from-147.90 ± 4.16 (2.29 nm-2) to-317.03 ± 4.20 (2.14 nm-2) kJ/mol S, indicating stronger sulfur specieszirconia bonding.

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confidence: 99%

Thermodynamic complexity of sulfated zirconia catalysts

Liu

Guo

Navrotsky

et al. 2016

Journal of Catalysis

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“…The excellent performance of the activated clay in the first hour could be attributed to the strong adsorption property of the clay, but the adsorption capacity saturated with time. Therefore, for activated clay, it was appropriate to describe the olefin removal rate by the adsorption rate 29 . From 2 to 6 hr, the reaction rate of HY zeolite decreased rapidly.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen from the Figure 4a that AlMS has two stages of weight loss. From the thermal characterization of AlMS, there were mainly four weight loss peaks during dehydration 29,36 . The first weight loss of AlMS can be attributed to the loss of water adsorbed on the samples.…”

Section: Resultsmentioning

confidence: 99%

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Metal‐reinforced sulfonic‐acid‐modified zirconia for the removal of trace olefins from aromatics

Kong

Peng

Shi

et al. 2020

J Chinese Chemical Soc

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Metal-reinforced sulfonic-acid-modified zirconia catalysts were successfully prepared and used to remove trace olefins from aromatics in a fixed-bed reactor. Catalysts were characterized by ICP-OES, N 2 adsorption-desorption, X-ray diffraction, thermogravimetric analysis (TGA), and pyridine-FTIR spectroscopy. Different metals and calcination temperatures had great influence on the catalytic activity. Alumina-reinforced sulfated zirconia exhibited outstanding catalytic performance, stable regeneration activity, and giant surface area, and are promising in industrial catalysis. TGA showed that the decomposition of methyl could be attributed to Brønsted acid sites, and pyridine-FTIR spectroscopy proved the weak Brønsted sites on these synthesized metal-reinforced sulfated zirconia. Also, a relation between the reaction rate and weak Brønsted acid density is proposed.

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“…The silica matrix was synthesized by sol-gel method [11]. TEOS (20.8 g) and formic acid (55.3 g) were mixed at room temperature and stirred for 25 min.…”

Section: Preparation Of Hybrid Catalystmentioning

confidence: 99%

A novel preparation method of sulfonic functionalized silica: CH3SO3H as the sulfonic source and Al as the bridge

2015

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A novel approach is designed to optimize the synthesis of sulfonic-functionalized silica material. Results from 29 Si and 27 Al NMR suggest that the Al acts as the bridging atom connecting the methanesulfonate and silica matrix. Further pyridine-FTIR spectra followed by catalytic activity tests demonstrate that compared with previous methods, our new approach results in higher Lewis acid site concentration, higher thermal stability and superior catalytic activity. Moreover, the whole catalysis preparation procedure is environmentally friendly. Specifically, the silica matrix is synthesized through hydrolysis of tetraethylorthosilicate employing formic acid as hydro-catalyst, in which no surfactant species or precursors were involved. methanesulfonic acid, silica, sulfonation, solid super-acid catalyst Citation:Liu NW, Yao JJ, Shi L. A novel preparation method of sulfonic functionalized silica: CH 3 SO 3 H as the sulfonic source and Al as the bridge.

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Direct syntheses of a promising industrial organic–inorganic hybrid silica containing methanesulphonate

Cited by 17 publications

References 49 publications

Thermodynamic complexity of sulfated zirconia catalysts

Thermodynamic complexity of sulfated zirconia catalysts

Metal‐reinforced sulfonic‐acid‐modified zirconia for the removal of trace olefins from aromatics

A novel preparation method of sulfonic functionalized silica: CH3SO3H as the sulfonic source and Al as the bridge

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