Effect of acid strength distribution on de‐<i>t</i>‐butylation rate and catalyst fouling rate

Takahashi, Tetsuo; Kuramoto, Kenji; Kai, Takami; Tashiro, Masashi

doi:10.1002/cjce.5450650417

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…The catalytic behavior of the zeolites for other reactions and their acid properties were available from the Society's report (Committee of Reference Catalysts, Catalysis Society of Japan, 1985). A commercially obtained SK-40 (Union Carbide, Linde Division) was modified to a proton-form by a previously described method (Takahashi et al, 1987a). HZMJ was synthesized by a previously reported method (Takahashi et al, 1984).…”

Section: Methodsmentioning

confidence: 99%

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Dehydration of 1‐phenylethanol over solid acidic catalysts

Takahashi¹,

Kai²,

Tashiro³

1988

Can J Chem Eng

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Dehydration of 1‐phenylethanol has been carried out over a solid acidic catalyst in order to examine the effect of the concentration of effective acid sites on the reaction rate, styrene selectivity and catalyst fouling. The reaction rate increased with the concentration of effective acid sites, while styrene selectivity decreased. The catalyst deactivation depended upon the concentration of the effective acid sites and also the size of the micro pores in the catalyst. Taking into account the reaction rate and selectivity, ALO‐4 alumina was the most suitable catalyst for the present reaction. An activation energy for the dehydration over ALO‐4 alumina was 83.8 kJ mol−1. The dehydration reaction could be a useful tool for the characterization of the nature of the acid sites.

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Section: Methodsmentioning

confidence: 99%

“…The experimental apparatus for the measurements of acidity and acid strength distribution was similar to that described in a previous study (Takahashi et al, 1987a). The weight of ammonia adsorption on the catalyst was measured by a thermobalance with a weighing sensitivity of 0.1 mg.…”

Section: P-ch3mentioning

confidence: 99%

Dehydration of 1‐phenylethanol over solid acidic catalysts

Takahashi¹,

Kai²,

Tashiro³

1988

Can J Chem Eng

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“…The reaction of t-butylbromobenzene was carried out over the HY zeolite whose strong acid sites were about 5 times larger than those of the silica-alumina (Takahashi et al, 1987). Figure 6 shows the relationship between rate constants over the partially poisoned catalyst (Op = 0.109) and the process time.…”

Section: The Reaction Of T-buty Lbromobenzene Over Poisoned Silica-almentioning

confidence: 99%

Effect of partial poisoning of acid sites on selectivity in the multiple reactions of mono‐substituted‐t‐Butylbenzenes

et al. 1987

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The decomposition reaction of p–t‐butylcumene and t‐butylbromobenzene have been carried out over pyridine poisoned silica‐alumina and HY zeolite in order to examine the effect of acid strength on selectivity. Since the catalyst deactivation rate for isomerization over the poisoned silica‐alumina was greater than that of de‐t‐butylation in the reaction of p–t‐butylcumene, the selectivity of de‐t‐butylation gradually improved with process time. In the reaction of t‐butylbromobenzene over poisoned HY zeolite, the de‐bromination rate was suppressed by the poisoning because the nature of active sites was different between silica‐alumina and HY zeolite. The poisoned HY zeolite was found to be favorable for the de‐t‐butylation of halogenated‐t‐butylbenzenes.

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“…There are reports in literature regarding the Lewis acid catalysed Friedel-Crafts isomerization [2] and de-tert-butylation. [3] The de-tertbutylation is also catalysed by metal oxide [4] and mineral acids. [5] Normally de-tert-butylation involves the treatment of tert-butyl arenes with Lewis acid in the presence of tert-butyl acceptor.…”

mentioning

confidence: 99%