Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst
Solid acid catalyst 15 wt%WO3/SnO2 was synthesized and loaded with 15 wt%SO4. The obtained catalyst was calcined at 400, 500, 650 and 800 °C. The prepared catalysts were characterized by TG-DTA, XRD, FTIR and N2 adsorption at −196 °C. The surface acidity was measured by non aqueous potentiometric ti...
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| Format: | Article |
| Language: | English |
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Elsevier
2017-02-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S187853521200233X |
| _version_ | 1811332931162996736 |
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| author | M.N. Alaya M.A. Rabah |
| author_facet | M.N. Alaya M.A. Rabah |
| author_sort | M.N. Alaya |
| collection | DOAJ |
| description | Solid acid catalyst 15 wt%WO3/SnO2 was synthesized and loaded with 15 wt%SO4. The obtained catalyst was calcined at 400, 500, 650 and 800 °C. The prepared catalysts were characterized by TG-DTA, XRD, FTIR and N2 adsorption at −196 °C. The surface acidity was measured by non aqueous potentiometric titration and FT-IR spectra of chemisorbed pyridine. The catalytic performance was evaluated on the esterification of propionic acid with n-butanol in liquid phase. The TG-DTA analysis shows that the decomposition of sulfate species occurred at >500 °C. XRD measurements showed that WO3 dispersed completely on the surface of SnO2 and that the sulfating of WO3/SnO2 tends to hinder the crystallization of SnO2. The specific surface area, total pore volume and micropore volume are increased with increasing thermal treatment up to 500 °C, and then decreased gradually with a further increase in calcination temperature. The prepared catalysts possess very strong acid sites and contain both Brønsted and Lewis acid sites. The total surface acidity decreased with raising of the calcination temperature. The highest conversion of propionic acid was for 400 °C product, and decreased with an increase in calcination temperature. The effect of the reaction parameters, i.e., time of reaction, reaction temperature, and reactant molar ratio and the weight of the catalyst were also studied. The reaction obeys the second order kinetic equation with respect to propionic acid concentration. Brønsted and Lewis acid sites appeared to be needed for catalytic activity in n-butyl propionate formation. |
| first_indexed | 2024-04-13T16:44:28Z |
| format | Article |
| id | doaj.art-27bcbb9da4db401fa8c33b9acde72bed |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-04-13T16:44:28Z |
| publishDate | 2017-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-27bcbb9da4db401fa8c33b9acde72bed2022-12-22T02:39:07ZengElsevierArabian Journal of Chemistry1878-53522017-02-0110S1S439S44910.1016/j.arabjc.2012.10.004Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalystM.N. AlayaM.A. RabahSolid acid catalyst 15 wt%WO3/SnO2 was synthesized and loaded with 15 wt%SO4. The obtained catalyst was calcined at 400, 500, 650 and 800 °C. The prepared catalysts were characterized by TG-DTA, XRD, FTIR and N2 adsorption at −196 °C. The surface acidity was measured by non aqueous potentiometric titration and FT-IR spectra of chemisorbed pyridine. The catalytic performance was evaluated on the esterification of propionic acid with n-butanol in liquid phase. The TG-DTA analysis shows that the decomposition of sulfate species occurred at >500 °C. XRD measurements showed that WO3 dispersed completely on the surface of SnO2 and that the sulfating of WO3/SnO2 tends to hinder the crystallization of SnO2. The specific surface area, total pore volume and micropore volume are increased with increasing thermal treatment up to 500 °C, and then decreased gradually with a further increase in calcination temperature. The prepared catalysts possess very strong acid sites and contain both Brønsted and Lewis acid sites. The total surface acidity decreased with raising of the calcination temperature. The highest conversion of propionic acid was for 400 °C product, and decreased with an increase in calcination temperature. The effect of the reaction parameters, i.e., time of reaction, reaction temperature, and reactant molar ratio and the weight of the catalyst were also studied. The reaction obeys the second order kinetic equation with respect to propionic acid concentration. Brønsted and Lewis acid sites appeared to be needed for catalytic activity in n-butyl propionate formation.http://www.sciencedirect.com/science/article/pii/S187853521200233XSO4/WO3/SnO2TG-DTAXRDFTIRSurface acidityEsterification reaction |
| spellingShingle | M.N. Alaya M.A. Rabah Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst Arabian Journal of Chemistry SO4/WO3/SnO2 TG-DTA XRD FTIR Surface acidity Esterification reaction |
| title | Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst |
| title_full | Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst |
| title_fullStr | Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst |
| title_full_unstemmed | Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst |
| title_short | Some physico-chemical properties and catalytic activity of sulfate ion supported on WO3/SnO2 catalyst |
| title_sort | some physico chemical properties and catalytic activity of sulfate ion supported on wo3 sno2 catalyst |
| topic | SO4/WO3/SnO2 TG-DTA XRD FTIR Surface acidity Esterification reaction |
| url | http://www.sciencedirect.com/science/article/pii/S187853521200233X |
| work_keys_str_mv | AT mnalaya somephysicochemicalpropertiesandcatalyticactivityofsulfateionsupportedonwo3sno2catalyst AT marabah somephysicochemicalpropertiesandcatalyticactivityofsulfateionsupportedonwo3sno2catalyst |