Cs-doped H4SiW12O40 catalysts for biodiesel applications

Pesaresi, L.; Brown, R. C.; Lee, Adam F.; Montero, Janine M.; Williams, Howard M.; Wilson, Karen

doi:10.1016/j.apcata.2009.03.003

Cited by 111 publications

(45 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When x value was lower than 1 in Cs 4-x H x SiW 12 O 40 , the amount of surface protons greatly decreased because the number of remained protons in the molecules became very low or zero. Actually, Cs 2.8 H 1.2 SiW 12 O 40 and Cs 3 HSiW 12 O 40 had been reported as active catalysts for triglyceride transesterification and isopropyl acetate decomposition [17,18]. Hence, Cs 3 HSiW 12 O 40 showed the largest DME conversion among Cs 4-x H x SiW 12 O 40 (Fig.…”

Section: Dme Carbonylation Over Solid Acid Catalystsmentioning

confidence: 96%

“…Heteropoly acids are excellent catalysts for both acid-catalyzed reactions and oxidation reactions in either homogeneous system or heterogeneous system [1,2]. Keggin-type heteropoly acids (such as H 3 PW 12 O 40 , H 4 SiW 12 O 40 , and so on) possess strong solid acidity and have been used as effective catalysts in many important reactions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Protontype heteropoly acids usually have low surface areas (\10 m 2 g -1 ), which hinders their application in the heterogeneous gas-flow reaction systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heterogeneous carbonylation of dimethyl ether to methyl acetate over bifunctional catalysts containing Rh and heteropoly acids

Liu

Murata

Inaba

2015

Reac Kinet Mech Cat

View full text Add to dashboard Cite

The carbonylation of dimethyl ether to methyl acetate was carried out in a high-pressure flowed fix-bed reaction system over heterogeneous halide-free catalysts. The TG curves indicated that solid 12-tungstosilicic acid had a crystal structure (with six crystallization waters) identical to that of solid 12-tungstophosphoric acid, although they had different number of protons in molecules. The BET surface areas greatly increased by Cs substitution in H 4 SiW 12 O 40 , and Cs 3 HSiW 12 O 40 showed a BET surface area of 206 m 2 g -1 . For the DME carbonylation at 473 K on 1 MPa under a CO/DME flow rate ratio of 18, Cs 3 HSiW 12 O 40 showed a DME conversion (6.7 %) higher than that over Cs 2 HPW 12 O 40 (4.6 %) because Cs 3 HSiW 12 O 40 had a larger surface area. Cs 3 HSiW 12 O 40 and Cs 2 HPW 12 O 40 showed high selectivity for methyl acetate of (98.0 and 97.5 %). By adding 1.0 wt% Rh in Cs 3 HSiW 12 O 40 , the DME conversion greatly increased from 6.7 to 30.8 % because a multiplier effect occurred between Rh and heteropoly acid. Rh/Cs 3 HSiW 12 O 40 showed a higher catalytic performance than those over the reported Rh/Cs 2 HPW 12 O 40 and Rh/H-MOR for the carbonylation. The DME conversion increased with increasing Rh loading from 0 to 1.0 wt% but became almost constant when Rh loading ranged from 1.5 to 3.0 wt% over Rh/Cs 3 HSiW 12 O 40 . With increasing the CO/DME ratio from 1.8 to 45, the DME conversion increased from 0.9 to 99.4 % over Rh/Cs 3 HSiW 12 O 40 at 473 K under 1 MPa. The 1 wt% Rh/Cs 3 HSiW 12 O 40 catalyst showed an initial DME conversion of 30.8 % (after 5 min on stream) but the DME conversion decreased to 23.3 % after 5 h on stream at 473 K on 1 MPa under a CO/DME flow rate ratio of 18.

show abstract

Section: Dme Carbonylation Over Solid Acid Catalystsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Heterogeneous carbonylation of dimethyl ether to methyl acetate over bifunctional catalysts containing Rh and heteropoly acids

Liu

Murata

Inaba

2015

Reac Kinet Mech Cat

View full text Add to dashboard Cite

show abstract

“…Thus, a variety of heterogeneous acid catalysts have been investigated to replace H 2 SO 4 . Zeolites, ion-exchange resins, and metal compounds like H-type mordenite with Si/Al molar ratio = 10 (HMOR(10)) [75], Amberlyst-15 [76,77], WO 3 /ZrO 2 [77,78], Cs-doped H 4 SiW 12 O 40 [79], sulphated zirconia [76], tungstated zirconia [80], and zinc stearate silica gel [81], show high efficiencies in FFA conversion (80-93%) at 60-75°C. However, the activity for transesterification is still low at a reaction temperature less than 200°C.…”

Section: Acid Catalystsmentioning

confidence: 99%

Environmentally Sustainable Biofuels: Advances in Biodiesel Research

Vasudevan

2010

Waste Biomass Valor

View full text Add to dashboard Cite

Due to diminishing petroleum reserves and the deleterious environmental consequences of exhaust gases from fossil-based fuels, research on renewable and environmentally friendly fuels has received a lot of impetus in recent years. With oil at high prices, alternate renewable energy has become very attractive. Many of these are eco-friendly. Besides ethanol, other unconventional choices are: biodiesel made from non-edible sources or waste cooking oil that can be blended with diesel; biobutanol; and gas-to-liquids from the abundance of natural gas, coal, or biomass. In this paper, we examine advances made in research on biodiesel. Current research on the synthesis of biodiesel can be classified into five areas: (i) the source of substrates, namely triglyceride and acyl-acceptors, (ii) reaction mechanism, (iii) catalysts for transesterification, including the application of inorganic base and acid catalysts as well as biocatalysts, (iv) solvent effects on biodiesel synthesis, especially in enzyme-catalyzed processes, and (v) operations and reactors involving traditional batch reactors, continuous reactors, novel membrane reactors and micro-channel reactors. Each of these areas is reviewed in this paper.

show abstract

“…With the complete or partial substitution of different counter cations for protons, its leaching could also be prevented. The synthesis of more stable heteropolyacid salts, such as cesium salts [21][22][23][24] and potassium salt [25], and ammonia salt [26], has become the hot topic of heteropolyacid catalyst design and research. Besides the alkaline metal salts and amine salt, the third group metal and transition metal are also implemented as partial neutralization cations of heteropolyacid in catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

et al. 2011

View full text Add to dashboard Cite

The 12-tungstophoric acid (HPW) and its calcium salts Ca x/2 H 3-x PW 12 O 4 with the calcium content in the range 0 \ x \ 3 supported on silica were synthesized, and their catalytic properties were also studied in the polymerization of tetrahydrofuran under mild conditions. These catalysts were characterized by isothermal nitrogen adsorption/desorption, infrared spectroscopy, n-butylamine electrometric titration, and thermal analysis. The calcium salts presented strong acidity and high catalytic performance. When x = 2.0, the supported calcium salt CaH-PW 12 O 40 /SiO 2 calcined at 300°C gave the highest catalytic activity. However, a poor catalytic activity was only obtained over the Ca 1.5 PW 12 O 40 /SiO 2 catalyst substituting all protons of phosphotungstic acid, which was due to its weakest acidity. The CaHPW 12 O 40 /SiO 2 sample showed better reusability than normal HPW/SiO 2 catalyst, and reacted as a recyclable and effective catalyst for tetrahydrofuran polymerization.

show abstract

Cs-doped H4SiW12O40 catalysts for biodiesel applications

Cited by 111 publications

References 45 publications

Heterogeneous carbonylation of dimethyl ether to methyl acetate over bifunctional catalysts containing Rh and heteropoly acids

Heterogeneous carbonylation of dimethyl ether to methyl acetate over bifunctional catalysts containing Rh and heteropoly acids

Environmentally Sustainable Biofuels: Advances in Biodiesel Research

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

Contact Info

Product

Resources

About