Sulfation: a simple method to enhance the catalytic activity of TS-1 in epoxidation of 1-octene with aqueous hydrogen peroxide

Nur, Hadi; Prasetyoko, Didik; Ramli, Zainab; Endud, Salasiah

doi:10.1016/j.catcom.2004.09.007

Cited by 29 publications

(23 citation statements)

References 7 publications

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“…Hydrophilic improvement of catalyst can be carried out by addition of metal oxide which leads to increasing of acidity properties. The metal oxide in TS-1 catalyst which act as acid site capable to increase catalyst hydrophilicity, so that reactant adsorption in catalyst becomes faster [10,11]. In previous research done by Indrayani [12], MoO 3 /TS-1 catalysts have showed improvement of hydrophilicity along with the increasing of MoO 3 content in MoO 3 /TS-1 catalyst.…”

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confidence: 98%

Vanadium Contribution to the Surface Modification of Titanium Silicalite for Conversion of Benzene to Phenol

Mulyatun¹,

Prasetyoko²

2011

JTS

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AbstractVanadium oxide supported on the surface of titanium silicalite was investigated in benzene hydroxylation to determine its activity as heterogeneous catalyst. Effect of vanadium loading on structure and activity of titanium silicalite was investigated. On the basis of X-ray diffraction and infrared spectroscopy techniques, it was found that the titanium structure was remained on the modified catalyst. The catalytic activity of the modified catalyst was observed to be higher than that of parent catalyst.Keywordstitanium silicalite, vanadium oxide, hydroxylation, benzene AbstrakAktivitas vanadium oksida yang berada pada permukaan titanium silikalit sebagai katalis heterogen telah diteliti pada hidroksilasi benzena. Pengaruh loading vanadium terhadap struktur dan aktivitas titanium silikalit telah dipelajari. Berdasarkan teknik difraksi sinar-X dan spektroskopi inframerah, ditemukan bahwa titanium pada katalis yang telah dimodifikasi tidak mengalami perubahan struktur. Aktivitas katalitik dari katalis yang telah dimodifikasi diamati lebih tinggi dibandingkan dengan katalis induk.Kata Kuncititanium silikalit, vanadium oksida, hidroksilasi, benzenahenol is an important intermediate compound for the synthesis of petrochemicals, agrochemicals, and plastics. Nowadays approximately 95 % of phenol production was produced by cumene process consisting of three main reaction steps (alkylation of benzene with propylene to cumene, oxidation of cumene to cumene hydroperoxide and decomposition to phenol and acetone) [1]. The advantage of the cumene process is that it takes two inexpensive starting materials, benzene and propylene and converts them into two high value useful products, phenol and acetone, using air. Despite its great success, the cumene process has some disadvantages such as the production of an explosive intermediate (cumene hydroperoxide), it has a high environmental impact, and it uses a corrosive catalyst. It is multi-step process, which makes it difficult to achieve high phenol yields in relation to benzene used and which leads to a high capital investment. It requires the uses of aggressive media (dilute sulphuric acid at 60-70 o C) and has a high acetone production as a co-product which results in an over supply in the market [2]. This situation encouraged scientists to develop other methods for producing phenol from benzene, preferably via a single-step and free of coproducts reaction, which thus would be economically favorable.The direct hydroxylation of benzene to phenol is an attractive alternative to phenol production for economically and environmentally reason [3]. One of the alternative routes to produce phenol which has more Mulyatun is with Department of Chemical Education, Faculty of Education, Institut Agama Islam Negeri Walisongo, Semarang, Indonesia.Didik Prasetyoko is with Department of Chemistry, FMIPA, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia. E-mail: didikp@chem.its.ac.id. advantages is through benzene hydroxylation reaction using H 2 O 2 as oxidant agent a...

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confidence: 98%

Vanadium Contribution to the Surface Modification of Titanium Silicalite for Conversion of Benzene to Phenol

Mulyatun¹,

Prasetyoko²

2011

JTS

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“…Generation of Brönsted acidity instead of Lewis acidity by sulphation seems unusual because previously it has been reported that the sulphation generates only Lewis acidity [4][5][6][7]. Although the mechanism of generation of Brönsted acid sites in The sulphate groups attached to the AlMCM-41 would be hydrolyzed in hydrophilic solvent such as water to produce Lewis acid sites.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Therefore, a demand for enhancing the acidity is needed to overcome this problem. Recently, several researchers [4][5][6][7] have reported the sulphation on the surface of AlMCM-41 and TS-1 materials to improve their catalytic activity. They reported that sulphation leads to produce only Lewis acidity.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that sulphation leads to produce only Lewis acidity. Most recently, we reported a new approach to produce Brönsted acidity in AlMCM-41 by sulphation method [7]. The approach is based on the idea that the acidity formed is influenced by the use of hydrophobic solvent so that it can protect the sulphate group from being hydrolyzed and produce Brönsted acid sites.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol

Nur

Wong

et al. 2007

Applied Catalysis A: General

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“…This phenomenon was explained by the presence of tripodal Ti active site [i.e. Ti(OSi) 2 (SO 3 )OH] that is the most active hydrated, tetrahedrally coordinated Ti species in sulfated materials [8,10]. Besides, ST_H 2 SO 4 sample appears to be the only efficient catalyst in producing 1,2-octanediol, indicating the presence of sufficient amount of Brønsted acid sites in the sample as was reflected in pyridine adsorption analysis .…”

Section: Catalytic Activitymentioning

confidence: 99%

Synthesis and Characterization of Acid Modified Silica-Titania Aerogel as Oxidative-Acidic Bifunctional Catalyst

Lee¹,

Nur²,

Koh³

et al. 2011

IJAPM

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Abstract-Acid treatment using H 2 SO 4 , HCl and H 3 PO 4 has been carried out in an attempt to improve catalytic performance of silica-titania aerogel. X-ray diffraction results showed the amorphous structure of the aerogels remained after the acid impregnation and calcinations steps. Hammert analysis revealed these acid modified silica-titania aerogels were superacids with pKa < -14.52. Different Ti species was observed in the samples upon the acid treatment. As compared to silica-titania aerogel, Lewis acidity increased remarkably in HCl treated sample without formation of any Brønsted acid site. Meanwhile, H 2 SO 4 and H 3 PO 4 treated samples possessed both Lewis and Brønsted acid sites. The catalytic performance of these samples was evaluated through a consecutive transformation of 1-octene to 1,2-octanediol through the formation of 1,2-epoxyoctane using aqueous hydrogen peroxide as oxidant.

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Sulfation: a simple method to enhance the catalytic activity of TS-1 in epoxidation of 1-octene with aqueous hydrogen peroxide

Cited by 29 publications

References 7 publications

Vanadium Contribution to the Surface Modification of Titanium Silicalite for Conversion of Benzene to Phenol

Vanadium Contribution to the Surface Modification of Titanium Silicalite for Conversion of Benzene to Phenol

Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol

Synthesis and Characterization of Acid Modified Silica-Titania Aerogel as Oxidative-Acidic Bifunctional Catalyst

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