Siriporn Jongpatiwut

Chulalongkorn University · Petroleum and Petrochemical College

Electrophoretic deposition (EPD) was applied for the coating of Pd/TiO2 catalyst, for the production of biohydrogenated diesel (BHD) in a microscale‐based reactor. The coating of TiO2 using EPD was investigated at various operating conditions. The Pd/TiO2 prepared by EPD were compared with the samples obtained by the conventional washcoating (WC) t...

In this research, the preparation of Pd-supported catalysts in microreactor was investigated for the production of renewable biohydrogenated diesel (BHD). Pd/Al2O3 and Pd/TiO2 catalysts were prepared by two different coating methods, slurry suspension (SUS), and sol-gel method (SG). Catalysts were coated on microreactor walls and tested for the deo...

The catalytic oxidation of different sulfur compounds, commonly present in liquid fuel, was studied over a series of ceria and ceria-zirconium based oxidation mesoporous catalysts. SBA-15 was synthesized using sol-gel method and Ce and Ce-Zr were added by two different procedures: i) directly during the synthesis and ii) via post-synthesis method....

Iridium catalyst using different zirconium modified-SBA-15 supports were tested in the HDT of tetralin and typical sulfur and nitrogen compounds present in diesel feed. The zirconium modified-SBA-15 supports were synthesized by sol-gel method using two sources of zirconium, zirconyl chloride and zirconium (IV) propoxide. Regarding XRD, N2 adsorptio...

Renewable diesel has gained attention in recent years due to its superior fuel properties compared to the conventional biodiesel. The uses of Pd supported TiO2 (Pd/TiO2) and Pd supported activated carbon (Pd/C) catalysts for the deoxygenation of triglycerides to renewable diesel were investigated. Two different types of titania supports, i.e. mesop...

The development of Pt-supported catalysts for a selective hydrocracking and hydroisomerization of bio-hydrogenated diesel (BHD, n-C15–C18) to hydroprocessed renewable jet (HRJ) fuel (C9 ̶ C14) was investigated. The different acidic supports (i.e. HY zeolite with SiO2/Al2O3 ratios of 5.5 and 100, and ASA supports) loaded with 0.5 wt.% Pt content wer...

The effects of hydrogen treatment on Zn/HZSM–5 catalysts to the evolution of zinc species and their activity in n-pentane aromatization were studied. By heating Zn/HZSM–5 catalysts under inert atmosphere, most of zinc species appeared as (ZnOH)+. The XPS and IPA–TPD results showed that using H2 as a treatment gas, the hydrodehydroxylation of (ZnOH)...

The catalytic conversion of PFAD (palm fatty acid distillate) to aromatics has been studied over HZSM-5, Ga/HZSM-5, and Zn/HZSM-5 catalysts. The presence of both Ga and Zn promoted the aromatization of PFAD. The higher aromatics yield of Zn/HZSM-5 was achieved by the presence of two zinc species; exchanged Zn2+ promoting the dehydrogenation of para...

Catalytic conversion of glycerol to BTX aromatics has been investigated over HZSM-5 and Zn-promoted HZSM-5 catalysts. The reaction pathway of glycerol to aromatics was proposed. Glycerol was first dehydrated to three main intermediates, propenal, acetaldehyde, and acetol. The combination of oxygenate pool and olefins formed heavy aromatics in the h...

The deoxygenation of methyl octanoate has been investigated over Cs-containing NaX zeolite catalysts at atmospheric pressure with He carrier gas and methanol as a co-feed. By varying the preparation procedures, different amounts of extra-framework Cs were left on the catalyst. The presence of extra-framework Cs affects the acid–basic characteristic...

The dehydroxylation of glycerol to propylene glycol was investigated over Cu–ZnO/Al2O3 catalysts prepared by three different methods—incipient wetness impregnation (IWI), co-precipitation (COP), and sol–gel (SG). The prepared catalysts were tested for their catalytic activity and selectivity in a continuous flow fixed-bed reactor at 523K and 3.2MPa...

AbstractThe purpose of this work was to investigate the liquid-phase cyclohexene epoxidation with H2O2 using RuO2-loaded mesoporous-assembled TiO2 nanocrystals. The loading of RuO2 on the mesoporous-assembled TiO2 was performed by two methods: (1) incipient wetness impregnation (IWI) (RuO2/TiO2 (IWI)) and (2) single-step sol–gel (SSSG) (RuO2/TiO2 (...

The conversion of methyloctanoate has been studied on Zn- and H-ZSM-5 catalysts. While the addition of Zn has a promoting effect in the aromatization of light alkanes, the effect is much lower when the feed is a methylester. Direct ring closure at the C adjacent to the CO group has been identified.

The conversion of methyl octanoate on an H-ZSM5 zeolite catalyst has been investigated as a model reaction for the production of hydrocarbon fuels and chemicals from biodiesel. The reactivity of methyl octanoate on H-ZSM5 is higher than that observed with a linear alkane of the same chain length as the ester, n-octane. The enhanced activity may be...

A series of mono- and bi-metallic Pt-Pd/Al2O3 samples with and without F were studied as aromatic hydrogenation catalysts. The effects of changing the order of impregnation of the Pt precursor and F as well as varying the calcination temperature (300–500 °C) were investigated. Temperature programmed reduction (TPR) results demonstrate the presence...

The hydrogenation of tetralin in the vapor phase has been investigated over Ni, Pt, and Pd catalysts to determine the evolution of the trans- and cis-decalin products as a function of conversion over the different catalysts. The concentration of each isomer in the product may be important in subsequent ring opening steps if cetane number improvemen...

The effects of varying zeolite crystallite size in n-octane aromatization over Pt=KL have been studied on a series of catalysts. Various KL zeolites were synthesized via microwave-hydrothermal treatment, which allows for good control of crystallite morphology. Zeolites with different crystallite sizes were prepared by varying aging time (17–24 h),...

The hydroisomerization of alicyclic compounds (e.g., methylcyclohexane) attracts the interests of researchers due to high demand for clean fuels, which can maintain high octane numbers while decreasing aromatic content. The composition of the products from skeletal isomerization of hydrocarbon is principally dependent on the shape selectivity and t...

Various Pt/KL catalysts were prepared over a series of zeolites with different crystallite size and shape. To control the crystallite size and shape and consequently the channel lengths, different zeolite synthesis parameters were varied. X-ray diffraction (XRD) analysis of the synthesized KL zeolites indicated a high degree of crystallinity in all...

The aromatization of n-octane, one of the main components of light naphtha, was studied over HZSM-5 (Si/Al = 10, 36, 50, and 100) and Zn/HZSM-5 catalysts prepared by the ion exchange method. The catalytic activity measurement was performed at 500°C under atmospheric pressure. The lower Si/Al ratio of HZSM-5 catalysts provided the higher selectivity...

The removal of poly-aromatics from diesel fuel has stimulated intense research because of increased stringent environmental legislation. Deep hydrogenation can greatly enhance the quality of diesel fuel. Platinum and palladium catalysts are well known as noble metals widely used in the hydrogenation reaction at low temperatures. The addition of F w...

The hydrogenation of aromatic compounds is a reaction of relevance in the improvement of diesel fuel quality. In this work, the kinetics of tetralin (1,2,3,4-tetrahydronaphthalene) hydrogenation over Pt/Al2O3 catalysts have been studied in an integral fixed bed reactor at 500 psig in the temperature range 553−573 K. A semiempirical Langmuir−Hinshel...

The aromatization of n-octane was studied over modified MFI- (ZSM-5) and MEL-(ZSM-11) type zeolite catalysts as bifunctional catalysts to study the effect of pore geometry on their catalytic activity and product distribution. Zinc was loaded into the synthesized zeolites by ion exchange to prepare Zn/HZSM-5 and Zn/HZSM-11 catalysts which were teste...

The removal of polynuclear aromatics from diesel fuel in response to increasingly stringent environmental legislation has stimulated intense research. In addition to the hydrogenation reaction that saturates aromatics, an interesting possibility is the opening of naphthenic rings derived from the saturation of aromatics to produce molecules of high...

The hydrogenation of tetralin, naphthalene, and phenanthrene as individual feed components and in diesel model feeds has been studied over a series of mono-and bimetallic Pt and Pd supported on -alumina at 300 • C and 500 psig in excess of H 2 . The influence of fluorine on activity level and sulfur resistance was evaluated in the presence of contr...

The effect of zeolite particle size on the product distribution of n-octane aromatization was studied. A series of KL zeolites of varying particle sizes was synthesized using the microwave-hydrothermal treatment technique. The particle sizes of the zeolites were varied by preparing the gel with different aging times (17-24 hr), amount of barium (10...

The aromatization of n-octane was investigated on a Pt/KL catalyst prepared by vapor phase impregnation (VPI), a preparation method that in previous studies was found to result in the highest Pt dispersion and maximum incorporation of Pt inside the channels of the zeolite compared to any other method. Although the aromatization of n-octane on Pt/KL...

Different Pt/KL catalysts containing rare earth (RE; Ce and Yb) promoters were prepared by two techniques, incipient wetness impregnation (IWI) and vapor phase impregnation (VPI). The catalysts were tested for the activity and the selectivity of n-hexane aromatization to benzene under clean, sulfur-containing, and water-containing feeds at 500 °C....