Efficient Synthesis of Dimethyl Ether over HZSM‐5 Supported on Medium‐Surface‐Area β‐SiC Foam

Ivanova, Svetlana; Vanhaecke, Estelle; Louis, Benoît; Libs, S.; Ledoux, Marc J.; Rigolet, Sévérine; Marichal, Claire; Pham, Charlotte; Luck, F.; Pham‐Huu, Cuong

doi:10.1002/cssc.200800024

Cited by 48 publications

(35 citation statements)

References 21 publications

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“…The higher surface area and activity of the coated catalyst in comparison with the bulk catalyst indicates a higher dispersion resulting from stabilization of the catalyst particles on the foam. Similarly, a higher activity of catalyst coating, owing to highly dispersed particles on the surface, has been observed over zeolites prepared by a hydrothermal synthesis on ceramic foams in the methanol to olefin reaction, [22] dimethyl ether synthesis, [23] and alcohol dehydration. [24] The selectivity of the fructose transformation in HMF also increases over time.…”

Section: Catalytic Resultsmentioning

confidence: 91%

Zirconium Phosphate Coating on Aluminum Foams by Electrophoretic Deposition for Acidic Catalysis

2011

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The electrophoretic deposition method has been applied for the formation of an amorphous zirconium phosphate layer on the surface of open‐cell aluminum foam. The aluminum foam was fully and uniformly covered by the zirconium phosphate layer with a good mechanical adherence to the support. The obtained composites were characterized by using XRD, SEM and nitrogen adsorption. The coated aluminum foams showed high catalytic activity in the dehydration of fructose to 5‐hydroxymethylfurfural. This method of foam coating is much more convenient and effective than the traditional washcoating procedure, avoiding the anodization pretreatment of the foam to increase adherence.

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Section: Catalytic Resultsmentioning

confidence: 91%

Zirconium Phosphate Coating on Aluminum Foams by Electrophoretic Deposition for Acidic Catalysis

2011

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“…[76][77] In our reaction we do not expect repolymerization products since we use milder conditions than reported wherein phenol is used. Moreover, from safety point of view it was not advisable to mix methanol and solid acid catalysts at high temperatures since methanol can give rise to highly volatile dimethyl ether as product [79][80][81] that will increase the pressures beyond our reactor limits. Before using these solvents in the reaction, we checked the stability of these solvents at 250 o C for 60 min.…”

Section: Study On Amorphous Sio 2 -Al 2 O 3 Catalysts 551 Effect mentioning

confidence: 99%

Lignin Depolymerization into Aromatic Monomers over Solid Acid Catalysts

2014

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It is imperative to develop an efficient and environmentally benign pathway to valorize profusely available lignin, a component of non-edible lignocellulosic materials into value-added aromatic monomers, which can be used as fuel additives and platform chemicals. To convert lignin, earlier studies used mineral bases (NaOH, CsOH) or supported metal catalysts (Pt, Ru, Pd, Ni on C, SiO 2 , Al 2 O 3 etc.) under hydrogen atmosphere but these methods face several drawbacks such as corrosion, difficulty in catalyst recovery, sintering of metals, loss of activity etc. Here we show that under inert atmosphere various solid acid catalysts can efficiently convert six different types of lignins in to value-added aromatic monomers. Particularly, SiO 2 -Al 2 O 3 catalyst gave exceptionally high yields of ca. 60 % for organic solvent soluble extracted products with 95±10 % mass balance in the depolymerization of dealkaline lignin, bagasse lignin, ORG and EORG lignins at 250 o C within 30 min. GC, GC-MS, HPLC, LC-MS, GPC analysis of organic solvent soluble extracted products confirmed the formation of aromatic monomers with ca. 90 % selectivity. In the products, confirmation of retention of aromatic nature as present in lignin and appearance of several functional groups is done by FT-IR, 1 H and 13 C NMR studies. Further, isolation of major products by column chromatography was carried out to obtain aromatic monomers in pure form and their further characterization by NMR is presented. Detailed characterization of six different types of lignins obtained from various sources helped in substantiating the catalytic results obtained in these reactions. Meticulous study on fresh and spent catalysts revealed that the amorphous catalysts are preferred to obtain reproducible catalytic results. . Materials.Dealkaline lignin (TCI Chemicals, product no. L0045), Alkali lignin (Aldrich, product no. 370959), Organosolv lignin (Aldrich, product no. 371017) were purchased and used without any pre-treatment. ORG and EORG lignins are obtained from local industries. Bagasse lignin was isolated in the laboratory by organosolv method. Zeolites, H-USY (Si/Al=15), H-ZSM-5 (Si/Al= 11.5), H-MOR (Si/Al=10), H-BEA (Si/Al=19) were obtained from Zeolyst International. Prior to use, zeolites were calcined at 550 °C for 16 h in air flow. SiO 2 -Al 2 O 3 (Aldrich), K10 clay and Al pillared clay (Aldrich), niobium pentoxide (Spectrochem) were also purchased. Various aromatic monomers were purchased from Aldrich, Alfa Aesar, TCI chemicals and used as received. Solvents like methanol (99.9 %, LOBA), ethanol (99.7 %, LOBA), tetrahydrofuran (99.8 %, LOBA), ethyl acetate (99.9 %, LOBA), chloroform (99.8 %, LOBA), diethyl ether (99.5 %, LOBA), hexane (99 %, LOBA) and dichloro methane (99.8 %, LOBA) were purchased and used as received. NaCl (Merck), H 2 SO 4 (98.5-

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“…Lutsenko et al also found that β-SiC could be completely dissolved in the mixture of HF and HNO 3 , whereas industrial SiC powder consisting of both α-SiC and β-SiC could be etched only partially [26]. Many researchers have demonstrated that SiC materials are potentially excellent catalyst support for various reactions [27], such as dehydrogenation of n -butane [28], selective oxidation of H 2 S [29], catalytic reforming of hydrocarbons [30], ammonia synthesis [31], partial oxidation of methane [32,33], and others [34-36]. However, these applications are greatly limited by the weak interaction between metal nanoparticles and SiC support.…”

Section: Resultsmentioning

confidence: 99%

Avoiding Loss of Catalytic Activity of Pd Nanoparticles Partially Embedded in Nanoditches in SiC Nanowires

et al. 2009

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Nanoditches from selective etching of periodically twinned SiC nanowires were employed to hinder the migration and coalescence of Pd nanoparticles supported on the nanowires, and thus to improve their catalytic stability for total combustion of methane. The results show that the etched Pd/SiC catalyst can keep the methane conversion of almost 100% while the unetched one has an obvious decline in the catalytic activity from 100 to 82% after ten repeated reaction cycles. The excellent catalytic stability originates from the limitation of the nanoditches to the migration and growth of Pd nanoparticles.

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Efficient Synthesis of Dimethyl Ether over HZSM‐5 Supported on Medium‐Surface‐Area β‐SiC Foam

Cited by 48 publications

References 21 publications

Zirconium Phosphate Coating on Aluminum Foams by Electrophoretic Deposition for Acidic Catalysis

Zirconium Phosphate Coating on Aluminum Foams by Electrophoretic Deposition for Acidic Catalysis

Lignin Depolymerization into Aromatic Monomers over Solid Acid Catalysts

Avoiding Loss of Catalytic Activity of Pd Nanoparticles Partially Embedded in Nanoditches in SiC Nanowires

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