Role of Active Matrix and Dealuniinated Zeolite in FCC Catalyst Formulation
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Mehrotra,R.P
Badoni,R.P Mool,Chand Singh,Anand Uma,Shankar |
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| Date |
2009-06-29T11:14:51Z
2009-06-29T11:14:51Z 2009-06-29T11:14:51Z |
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| Identifier |
Proceedi1llis of PETROTECH-95, New Delhi
http://hdl.handle.net/123456789/276 |
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| Description |
Zeolite based nuid catalytic cracking (FCC) catalysts have opened up
widc opportunities to develop varieties of highly selective catalysts for specific
applications. Rareeartll exchanged Y(REY) zeolitiesoilinactive matrix have been
widely used in commercial catalysts for Indian FCC units geared towards
maximization of middle distillates. The crucial aspects of an FCC catalysts design
are its improved coke selectivity, hydrothennal stability and bottom upgrading
apart from oUlCrminor considerations. This has heen accomplished via ultra
stabilization of zeulitc Y tJmJUghcuntrolled dealumination techniques.
A series uf dealuminated zeolite Y samples willI increasing degree of
dealumination have been prepared by stcaming UleN1I4exchanged Na Y zeolite
under mild, intennediateand severe conditions to create mesoporosity. A treaunent I
willI dilute BCI has been applied to Ulesamples in Of{'~rtoeliminate non-framework
aluminium (NFAL)species created hy steaming. The fr,unework aluminium
(PAL), however remains unaffected by acid leaching. The ultra stahle Y (lJSY)
zeolities thus obtained have been incorporated into high surface area, high acidity
matrix. Crystallinity reduction in wide range of dealuminated samples have been
in the range 01'25-35%as compared to45tJ,Jcrystallinity loss in steam deactivation
of cOlllmercial samples. Optimization of NFAL control on catalyst perfonnance
has been done for formulating catalyst using dealuminated Y-zeolite willI alld
willlO\ltacid extraction. Acid extraction of NFAL generally illlpr~es the..acidity
of dealuminated zeolite. After evaluating Ille variuus formulations preparcd, the
finished catalyst using optimum level of dealuminaled Y-zeolite and NFAL
removed by acid treatment have been f(iund promising in respect of its activity,
selccli vity perfonnancc and physico-chemical properties. The repeat fonnulations
of this calalyst have shown consistcncy in resulls. The catalyst has 40-50% higher
surface area and the liner particle si7e as compared to commercial samples. 'fhe
rcduction in surface area of sle,uned s;unple was around 45%. The porc volume
was higher as compared to 0.32 gm/ml of tJle commercial smnples. The tout!
acidity of Ule steamed sample has heen (0.15 m mole NH3/g of catalyst)
comparable (0 commcrcial FCe catalyst samples. Activity wise tJlCcatalyst is
almost similar (MAT activity=67) to tJ\(~l)f tJlereference catalyst. C3/C4 have
bcen foundhigherhy few percentage and ([.tk) yield lower by 1-2'ft,for liP catalyst.
Othcr product selectivities in terms of LIlG, TeO and gasolinc arc COlli parable
however, III' catalyst has shown better coke selectivity.
It is thus possihlc todevelop varietiesolTCC catalyst fonnulations for specific
needs. This wuld he accomplished hy putting tJle right type and mnount of
dealuminated Y-zeolite crystal into an activc matrix. Catalyst yielding remarkable
product selectivities and qualities could, tJlercfore, be fonnulated by carefully
balancing tJlezeolite/matrix acidity. Mesoporosity may beuseful in rcsid processing
catalyst.
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| Language |
en_US
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| Subject |
FCC Catalyst
Zeolite |
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| Title |
Role of Active Matrix and Dealuniinated Zeolite in FCC Catalyst Formulation
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| Type |
Article
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