Analysis of coke formed during zeolite-catalyzed supercritical dodecane cracking: Effect of supercritical water

被引：12

作者：

Guerra, Patricia ^{[1
]}

Zaker, Azadeh ^{[1
]}

Duan, Pu ^{[2
]}

Maag, Alex R. ^{[1
]}

Tompsett, Geoffrey A. ^{[1
]}

Brown, Avery B. ^{[1
]}

Schmidt-Rohr, Klaus ^{[2
]}

Timko, Michael T. ^{[1
]}

机构：

[1] Worcester Polytech Inst, Dept Chem Engn, Worcester, MA 01609 USA

[2] Brandeis Univ, Dept Chem, Waltham, MA 02453 USA

来源：

APPLIED CATALYSIS A-GENERAL | 2020年 / 590卷

关键词：

Coke; Zeolite; ZSM-5; Hydrocarbon cracking; Supercritical water; FAST PYROLYSIS; DEACTIVATION; CONVERSION; REGENERATION; SPECTROSCOPY; METHANOL; H-ZSM-5; SELECTIVITY; PREVENTION; MECHANISM;

D O I：

10.1016/j.apcata.2019.117330

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Coking behavior of ZSM-5 was studied in the absence and presence of supercritical water (SCW) using dodecane cracking as a model reaction. SCW suppresses coke formation and inhibits conversion of coke precursors into polycyclic aromatic hydrocarbons. Interestingly, the thermal and structural characteristics of coke formed in the presence and absence of SCW appear to follow similar reaction trajectories, with the primary difference being rate inhibition in the presence of SCW. Further experiments indicated that SCW must suppress coke by an indirect role of catalyst modification and by a direct role involving chemical or physical participation in the coke formation mechanism. These results provide new insight into the role of SCW on coke formation and motivate future work to identify strategies for stabilizing acid sites in the presence of liquid water.

引用

页数：10

共 53 条

[1] Investigating the Coke Formation Mechanism of H-ZSM-5 during Methanol Dehydration Using Operando UV-Raman Spectroscopy [J].

An, Hongyu ;

Zhang, Fei ;

Guan, Zaihong ;

Liu, Xuebin ;

Fan, Fengtao ;

Li, Can .

ACS CATALYSIS, 2018, 8 (10) :9207-9215

[2] Biomass gasification in supercritical water [J].

Antal, MJ ;

Allen, SG ;

Schulman, D ;

Xu, XD ;

Divilio, RJ .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2000, 39 (11) :4040-4053

[3] Heterogeneous Catalyst Deactivation and Regeneration: A Review [J].

Argyle, Morris D. ;

Bartholomew, Calvin H. .

CATALYSTS, 2015, 5 (01) :145-269

[4] Characterization of coke on equilibrium fluid catalytic cracking catalysts by temperature-programmed oxidation [J].

Bayraktar, O ;

Kugler, EL .

APPLIED CATALYSIS A-GENERAL, 2002, 233 (1-2) :197-213

[5] High effective dehydration of bio-ethanol into ethylene over nanoscale HZSM-5 zeolite catalysts [J].

Bi, Jiandong ;

Guo, Xinwen ;

Liu, Min ;

Wang, Xiangsheng .

CATALYSIS TODAY, 2010, 149 (1-2) :143-147

[6] COKE FORMATION IN ZEOLITE ZSM-5 [J].

BIBBY, DM ;

MILESTONE, NB ;

PATTERSON, JE ;

ALDRIDGE, LP .

JOURNAL OF CATALYSIS, 1986, 97 (02) :493-502

[7] Coke precursor formation and zeolite deactivation: mechanistic insights from hexamethylbenzene conversion [J].

Bjorgen, M ;

Olsbye, U ;

Kolboe, S .

JOURNAL OF CATALYSIS, 2003, 215 (01) :30-44

[8] Catalyst deactivation by coke formation in microporous and desilicated zeolite H-ZSM-5 during the conversion of methanol to hydrocarbons [J].

Bleken, Francesca Lonstad ;

Barbera, Katia ;

Bonino, Francesca ;

Olsbye, Unni ;

Lillerud, Karl Petter ;

Bordiga, Silvia ;

Beato, Pablo ;

Janssens, Ton V. W. ;

Svelle, Stian .

JOURNAL OF CATALYSIS, 2013, 307 :62-73

[9] FLUID MIXTURES AT HIGH-PRESSURES .9. PHASE-SEPARATION AND CRITICAL PHENOMENA IN 23 (NORMAL-ALKANE + WATER) MIXTURES [J].

BRUNNER, E .

JOURNAL OF CHEMICAL THERMODYNAMICS, 1990, 22 (04) :335-353

[10] Deactivation of FCC catalysts [J].

Cerqueira, H. S. ;

Caeiro, G. ;

Costa, L. ;

Ribeiro, F. Ramoa .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2008, 292 (1-2) :1-13

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