FCC catalysts containing the high-silica faujasites EMO and EMT for gas-oil cracking

Haas, A.; Harding, David A.; Nee, J. R. D.

doi:10.1016/s1387-1811(98)00247-9

Cited by 33 publications

(15 citation statements)

References 14 publications

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“…We propose that under appropriate conditions the EMT is the first kinetic, metastable product in this synthesis field, followed by conversion into the more stable cubic FAU and more dense SOD structures. This hypothesis is strongly supported by several reports on EMT/FAU intergrowths (9)(10)(11)(12)(13)(14). Indeed, we suggest that it may be possible to capture other important zeolite phases that occur as intergrowths by exploiting the very early stages of synthesis and thus avoiding the use of organic reagents that are commonly needed to stabilize the desired phases.…”

Section: Rtss-a Vaccine With Many Maybes Extrasolar? Extra Strangesupporting

confidence: 85%

“…The cubic FAU polymorph features only one type of supercage (with a volume of 1.15 nm 3 ), but a different stacking of faujasite sheets creates two cages in the EMT zeolite: a hypocage (0.61 nm 3 ) and a hypercage (1.24 nm 3 ) (7). The EMT material shows interesting catalytic properties different from FAU as an FCC catalyst, but the very high price of the product so far precludes practical uses (8,9).…”

Section: Rtss-a Vaccine With Many Maybes Extrasolar? Extra Strangementioning

confidence: 99%

“…In addition, several EMT-FAU intergrown phases (CSZ-1, ECR-30, ZSM-20, ZSM-3) have also been reported (9)(10)(11)(12)(13)(14). The synthesis of pure EMT-type zeolite is possible by templating with the expensive 18-crown-6 ether and using tightly controlled synthesis parameters (7).…”

Section: Rtss-a Vaccine With Many Maybes Extrasolar? Extra Strangementioning

confidence: 99%

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Capturing Ultrasmall EMT Zeolite from Template-Free Systems

Chateigner

Bein

et al. 2012

Science

264

199

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Small differences between the lattice energies of different zeolites suggest that kinetic factors are of major importance in controlling zeolite nucleation. Thus, it is critical to control the nucleation kinetics in order to obtain a desired microporous material. Here, we demonstrate how careful investigation of the very early stages of zeolite crystallization in colloidal systems can provide access to important nanoscale zeolite phases while avoiding the use of expensive organic templates. We report the effective synthesis of ultrasmall (6- to 15-nanometer) crystals of the large-pore zeolite EMT from template-free colloidal precursors at low temperature (30°C) and very high yield.

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Section: Rtss-a Vaccine With Many Maybes Extrasolar? Extra Strangesupporting

confidence: 85%

Section: Rtss-a Vaccine With Many Maybes Extrasolar? Extra Strangementioning

confidence: 99%

See 1 more Smart Citation

Capturing Ultrasmall EMT Zeolite from Template-Free Systems

Chateigner

Bein

et al. 2012

Science

264

199

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“…Other examples include addition of polyolefins to benzene ring for surfactant production such as C 11 to C 15 for household detergents and the production of lubricant detergents from C 16 to C 24 alkyl chains attached to the benzene ring without ring opening. [60] Furthermore, the opening of the benzene ring when it was alkylated with C 5 -C 9 carbonyls suggested that these were new classes of chemical 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 reactions that need further studies. The exact mechanism of these reactions are still under investigation.…”

Section: Discussionmentioning

confidence: 99%

Aqueous Phase Synthesis of Hydrocarbons from Reactions of Guaiacol and Low Molecular Weight Oxygenates

Agblevor

Jahromi

2018

ChemCatChem

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Catalytic pyrolysis of lignocellulosic biomass generates water‐soluble low molecular weight oxygenates such as acetic acid, acetone, furfural, butanone, guaiacol, phenol and others in significant quantities that will affect the profitability of the biorefinery process. A new heterogeneous catalyst has been developed that catalyzes the reaction of carbonyl compounds with unsaturated ethers in aqueous medium to produce C6 to C15 hydrocarbons in a one‐pot synthesis. These reactions are called “carbonyl alkylations” because the carbonyl carbon chain was added to the aromatic ring and the oxygen was eliminated without loss of carbon. The C1 to C4 ketones and aldehydes produce alkylated benzenes while the C5 and higher carbonyl compounds alkylated the benzene ring and also opened the benzene ring to produce long chain internal alkene compounds. All the reactions occurred in the aqueous media at 300–350 °C on a supported nickel catalyst. The gaseous products included low molecular weight hydrocarbons such as methane, propane, butane, and pentane. Thus, it has been demonstrated for the first time that it is possible to produce a wide array of hydrocarbons from low molecular weight biomass derived oxygenates.

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“…Zeolite ZSM-20 118 and ITQ-21 119 both have structures that resemble zeolite Y, and pore openings that are similar in size to zeolite Y. Their cracking characteristics are similar to zeolite Y, except for a higher gas (LPG) and propylene yield but lower gasoline olefinicity in ITQ-21.…”

Section: Improvements In Fcc Catalyst Materialsmentioning

confidence: 99%