Catalytic isomerization of 1‐hexene on hy zeolite

Ko, An-Nan; Wojciechowski, B. W.

doi:10.1002/kin.550151202

Cited by 43 publications

(27 citation statements)

References 26 publications

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“…As a result, the initial conversion rates of n-hexane were estimated from the tangent at zero contact time in the plot of the conversion versus contact time of n-hexane [9][10][11]. The concentration of methanol in feed was fixed at 10% (C%) in most coupling experiments to limit the extent of methanol interconversion reactions.…”

Section: Catalytic Testmentioning

confidence: 99%

An Improved Catalytic Cracking of n-hexane via Methanol Coupling Reaction Over HZSM-5 Zeolite Catalysts

et al. 2006

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The coupling transformation of n-hexane and methanol over HZSM-5 has been investigated with a pulse-reaction system. In the temperature range of 400-500°C, kinetic data was collected and reaction order was determined. Compared with the pure n-hexane cracking, the increased rate constant and the lowered apparent activation energy clearly demonstrate an improvement of n-hexane activation using methanol as co-reactant and an increased contribution of faster bimolecular mechanism to the n-hexane transformation due to methanol introduction. Similarly, the results of coupling transformation performed over HZSM-5 with different Al content further confirm the transition between reaction mechanisms of n-hexane on account of the introduction of methanol. Moreover, the further investigation suggests that the enhancement of n-hexane activation and the change of reaction mechanism are attributed to the presence of intermediate species evolved from methanol. Thus, a proposed reaction pathway of n-hexane activation with methanol as co-reactant was put forward.

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Section: Catalytic Testmentioning

confidence: 99%

An Improved Catalytic Cracking of n-hexane via Methanol Coupling Reaction Over HZSM-5 Zeolite Catalysts

et al. 2006

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“…The isomerization of olefins was studied in a number of publications during the past (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35). Double-bond and cis-trans isomerization, as well as the skeletal rearrangement of these substances, were in the focus of interest (e.g., (18,19,33)).…”

Section: Introductionmentioning

confidence: 99%

“…Double-bond and cis-trans isomerization, as well as the skeletal rearrangement of these substances, were in the focus of interest (e.g., (18,19,33)). Due to the increasing demand for i-butene as a reactant in the synthesis of methyl-tert-butyl-ether (MTBE) (32)(33)(34)(35) isomerization of n-butene to i-butene was recently discussed in several articles.…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of Light Alkanes over Zeolites

Narbeshuber

Brait

Seshan

et al. 1997

Journal of Catalysis

114

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The conversion of light paraffins to olefins and the secondary reactions of the unsaturated compounds were investigated on H-ZSM5 and H-Y zeolites between 733 and 823 K. Steady stateand transient response-isotope tracing studies revealed that two mechanisms of dehydrogenation are operative. The main pathway is represented by monomolecular, protolytic dehydrogenation. This reaction contributes most to steady state olefin production. Additionally, at the initial stages of the reaction, extra framework aluminum moieties are speculated to participate in high dehydrogenation activity. This pathway is blocked at later stages of the reaction by product (hydrogen) inhibition. The intrinsic rates of protolytic dehydrogenation and olefin desorption range in the same order of magnitude. At high protolytic dehydrogenation rates, olefin desorption represents the rate determining step. Depending on the process conditions, olefins undergo secondary cracking, oligomerization, or isomerization. The latter proceeds via intramolecular rearrangement, possibly via a cyclopropylcarbenium ion at high temperatures and low conversions. At reaction conditions where bimolecular cracking prevails, isomerization is concluded to occur via secondary cracking of di-or oligomers.

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“…1. OPE Curves for the methylation of phenol with dimethyl carbonate particular product (X) against the phenol conversion (Xz), such as described by Ko and Wojciechowski [16]. Table 3 Apparent rate constants at different temperatures and product seleedvities (mol %) over CrPO4-A1PO4 catalysts The results show that, in the range of the conversions studied, anisole was the primary reaction product, o-Cresol was a primary plus secondary stable reaction product coming from anisole by isomerization and by phenol alkylation at high reaction temperatures.…”

Section: In [1/(1-xt) ] = Rt Ka (W/f)mentioning

confidence: 99%

Phenol methylation over CrPO4 and CrPO4−AlPO4 catalysts

Bautista

Campelo

García

et al. 1997

React Kinet Catal Lett

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The vapor-phase catalytic alkylation of phenol with methanol and dimethyl carbonate on a series of differently prepared CrPO4 (Cr/P=I) and CrPO4-AIPO4 (CrAlP) catalysts, has been studied at different temperatures (473-673 K). The reaction is first order in phenol, giving a mixture of O-and C-alkylated products (C-alkylation taking place preferentially at the ortho-position). Moreover, dimethyl carbonate is a better methylating agent than methanol.Keyworcls: chromium orthophosphate (CrP04), chromium aluminium orthophosphates (CrPO4-AIPO4), surface acidity, phenol/methanol and phenol/dimethyl carbonate alkylation, activity, selectivity

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Catalytic isomerization of 1‐hexene on hy zeolite

Cited by 43 publications

References 26 publications

An Improved Catalytic Cracking of n-hexane via Methanol Coupling Reaction Over HZSM-5 Zeolite Catalysts

An Improved Catalytic Cracking of n-hexane via Methanol Coupling Reaction Over HZSM-5 Zeolite Catalysts

Dehydrogenation of Light Alkanes over Zeolites

Phenol methylation over CrPO4 and CrPO4−AlPO4 catalysts

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