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

Abstract

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...

Synthesis and Characterization of Physically Mixed V2O5.CaO as Bifunctional Catalyst for Methyl Ester Production from Waste Cooking Oil

“…This fact is also in accordance with research of Ngaosuwan et al (2021), which stated that the incorporation of La2O5 into CaO with the physical mixing method also reduced the intensity of the diffraction pattern of CaO. Mulyatun and Prasetyoko (2011) stated that the V2O5 catalyst with an orthorhombic crystal structure contributed peaks with high intensity at 2θ of 20.28º; 26.15º and 34.31º.…”

“…The 2% V2O5 metal oxide contributed to the acid site formation in the CaO catalyst, which favored the esterification reaction in biodiesel production from WCO. Both the Lewis and Brønsted acid sites were found in V2O5 metal oxides(Mulyatun & Prasetyoko, 2011). This result is also obtained byAlmeida et al (2016), whom stated that V2O5 addition to SiO2 catalyst formed Brønsted and Lewis acid sites for soybean oil-based biodiesel production.…”

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Effect of Ag addition into the Activity of Titanium Silicate-1 Catalyst in Cyclohexanone Reaction

“…The absorption band at a wavenumber of about 1100 cm -1 was the Si-O-Si asymmetrical vibration mode, while the absorption band at a wavenumber of around 800 cm -1 was the symmetrical one. The absorption band that appeared at a wavenumber of around 1230 and 547 cm -1 was the characteristic of the tetrahedral structure in a zeolite framework with MFI type (Mulyatun & Prasetyoko, 2011). The absorption band that appeared at a wavenumber of around 970 cm -1 was the characteristic of TS-1.…”

Titanosilicate porous thin film on silicon substrate as catalyst for hydroxylation of phenol in continuous flow reactor

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