The dependence of ZSM-5 additive performance on the hydrogen-transfer activity of the REUSY base catalyst in fluid catalytic cracking

Wallenstein, D.; Harding, Robert H.

doi:10.1016/s0926-860x(01)00482-3

Cited by 59 publications

(22 citation statements)

References 14 publications

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“…Synergetic effects through mixing of conventional FCC catalyst (mostly USY zeolite) with ZSM-5 additive have been observed by several authors, and show that there is an increase in the yield of light olefins for the catalyst mixture, compared to product yield on the individual catalysts, suggesting that the reaction products are transferred between USY zeolite and ZSM-5 [6,7,9,10,17,18]. Improvements in FCC catalyst, process design, hardware, and operation severity can boost high value light olefins yields, with propylene yield that can increase from 6 wt% up to 25 wt% or higher with VGO feed.…”

Section: Introductionmentioning

confidence: 84%

Reactivity of naphtha fractions for light olefins production

et al. 2016

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The catalytic cracking of naphtha fractions for propylene production was investigated under high severity catalytic cracking conditions (high temperatures and high catalyst to oil ratio). Straight run naphtha and cracked naphtha along with a with proprietary catalyst were used, and reaction was carried out using a catalyst to oil ratio (C/ O) of 3-6 at 600-650°C and 1 atm in a micro activity testing (MAT) unit. The results from this experiments show that light cracked naphtha (LCN) gave the highest propylene yield of 18% at 650°C, and that propylene yield depends on the naphtha fraction being used as feed. The trend for reactivity and propylene yield was as follows: light cracked naphtha [ heavy straight run naphtha [ light straight run naphtha [ heavy cracked naphtha.

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Section: Introductionmentioning

confidence: 84%

Reactivity of naphtha fractions for light olefins production

et al. 2016

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“…It is well known and accepted that LPG and gasoline olefins production in a conventional FCC unit is favoured by the use of low hydrogentransfer activity Y zeolite based catalysts. 59 According to Corma et al, bimolecular hydrogen transfer mechanism implies that an adsorbed carbenium ion takes an hydride ion from a nearby donor molecule to desorb as saturated molecule, while the donor hydrocarbon is further adsorbed as a carbenium ion and may either desorb as a dehydrogenated product, or suffer a βcracking process to yield an unsaturated molecule and a smaller carbenium ion. 60 The extent of the hydrogen transfer activity of an FCC catalyst is then directly governed by the density of paired acid sites and the affinity for olefin adsorption.…”

Section: Fcc Catalyst Systems Optimizations For Maximum Light Olefinsmentioning

confidence: 99%

Crude oil to chemicals: light olefins from crude oil

Corma

Corresa

Mathieu

et al. 2017

Catal. Sci. Technol.

279

163

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“…Incorporating active components such as phosphorus and metals in the additive formulation that aid in the conversion of heavier molecules and optimization of additive formulations with high ZSM-5 levels, are some of the approaches for overcoming the loss in activity of FCC catalyst systems [4][5][6][7][8][9]. The utilization of other types of zeolites as FCC additives such as MCM-22 [10], ITQ [11], beta [12,13], mordenite [13], MCM-68 [14] and bi-functional ZSM-5/MgAl 2 O 4 -based additive [15] were discussed in other papers.…”

Section: Introductionmentioning

confidence: 99%

Utilization of ZSM-5/MCM-41 composite as FCC catalyst additive for enhancing propylene yield from VGO cracking

et al. 2011

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A micro-mesoporous ZSM-5/MCM-41 composite molecular sieve (ZM13) was synthesized and tested as an FCC catalyst additive to enhance the yield of propylene from catalytic cracking of vacuum gas oil (VGO). The catalytic performance of the additive was assessed using a commercial equilibrium USY FCC catalyst (E-Cat) in a fixed-bed micro-activity test unit (MAT) at 520°C and various catalyst/oil ratios. MCM-41, ZSM-5 and two ZSM-5/MCM-41 composites were systematically characterized by complementary techniques such as XRD, BET, FTIR and SEM. The characterization results showed that the composites contained secondary building unit with different textural properties compared to pure ZSM-5 and MCM-41. MAT results showed that the VGO cracking activity of E-Cat did not decrease by using these additives. The highest propylene yield of 12.2 wt% was achieved over steamed ZSM-5/MCM-41 composite additive (ZM13) compared with 8.6 wt% over conventional ZSM-5 additive at similar gasoline yield penalty. The enhanced production of propylene over composite additive was attributed to its mesopores that suppressed secondary and hydrogen transfer reactions and offered easier transport and accessibility to active sites. Gasoline quality was improved by the use of all additives except MCM-41, as octane rating increased by 6-12 numbers.

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The dependence of ZSM-5 additive performance on the hydrogen-transfer activity of the REUSY base catalyst in fluid catalytic cracking

Cited by 59 publications

References 14 publications

Reactivity of naphtha fractions for light olefins production

Reactivity of naphtha fractions for light olefins production

Crude oil to chemicals: light olefins from crude oil

Utilization of ZSM-5/MCM-41 composite as FCC catalyst additive for enhancing propylene yield from VGO cracking

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