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Featured researches published by Xiaoliang Ma.


Catalysis Today | 1996

Deep hydrodesulfurization of diesel fuel: Design of reaction process and catalysts

Isao Mochida; Kinya Sakanishi; Xiaoliang Ma; Shinichi Nagao; Takaaki Isoda

Abstract Deep hydrodesulfurization (HDS) of diesel fuel oil was designed based on the recognition that alkyl dibenzothiophenes such as 4-methyl-and 4,6-dimethyldibenzothiophenes were the main target for deep HDS. Multi-stage and fractional HDS were very effective to achieve satisfactory HDS in terms of both sulfur level and fluorescent color of desulfurized oil. Catalysts with the selective hydrogenation of refractory sulfur species in major aromatic partners and isomerization-disproportionation of their alkyl groups prior to HDS were also designed to promote the desulfurization of such sulfur species.


Fuel | 1997

Determination of sulfur compounds in non-polar fraction of vacuum gas oil

Xiaoliang Ma; Kinya Sakanishi; Takaaki Isoda; Isao Mochida

Abstract Sulfur compounds in the non-polar fraction, which represents 73 wt% of total sulfur in a vacuum gas oil (VGO), were analysed by sulfur-selective ligand exchange chromatography combined with high-performance liquid chromatographic (h.p.l.c.) separation on the basis of aromatic ring number, with subsequent capillary g.c.-mass spectrometry for identification. Quantification was achieved by independent h.p.l.c. separation based on aromatic ring number followed by capillary gas chromatography with a sulfur-selective flame photometric detector. These methods were very effective in isolating the sulfur compounds from complex mixtures of high-boiling hydrocarbon compounds and for separating the sulfur compounds according to aromatic ring number. The structures and concentrations of > 100 sulfur compounds in the non-polar fraction of the VGO were determined Alkyl benzo[b]thiophenes, dibenzo[b,d]thiophenes, benzonaphthothiophenes and phenanthro[4,5-b,c,d]thiophenes were found to be major sulfur species existing in the non-polar fraction of the VGO.


Fuel | 1994

Three-stage deep hydrodesulfurization and decolorization of diesel fuel with CoMo and NiMo catalysts at relatively low pressure

Xiaoliang Ma; Kinya Sakanishi; Isao Mochida

Three-stage deep desulfurization of diesel fuel was performed using CoMo in the first stage and NiMo in the other two stages under H2 at 2.9 M Pa. The first and second stages were carried out at higher temperature for sufficient desulfurization of benzothiophenes and dibenzothiophenes respectively, and the third stage was carried out at lower temperature to remove the fluorescent colour from the desulfurized oil. A sulfur content of < 200 ppmw was achieved as well as decolorization. The influence of the reaction conditions in the different stages on hydrodesulfurization and fluorescent colour development and removal were examined in detail.


Applied Catalysis A-general | 1997

Catalytic activities of NiMo and CoMoAl2O3 of variable Ni and Co contents for the hydrodesulfurization of 4,6-dimethyldibenzothiophene in the presence of naphthalene

Takaaki Isoda; Shinichi Nagao; Xiaoliang Ma; Yozo Korai; Isao Mochida

Abstract The catalytic activities of NiMo Al 2 O 3 and CoMo Al 2 O 3 with a variable content of Ni and Co, respectively, were examined for the hydrodesulfurization (HDS) of refractory sulfur species, 4,6-dimethyldibenzothiophene (4,6-DMDBT), in decane with naphthalene. Naphthalene of 10 wt.−% severely retarded the HDS of 4,6-DMDBT over the series of NiMo catalysts. Hydrogenation of naphthalene dominated over the series of NiMo catalysts, suppressing the HDS of 4,6-DMDBT over the catalysts. CoMo catalysts were superior to the NiMo catalysts for the HDS activities of 4,6-DMDBT with less retardation of the aromatic partner, providing the highest activity at Co content of 1 wt.−% in 15 wt.−% of Mo, although the former catalysts were inferior to the latter ones for the hydrogenation activities of the aromatic partner. The valence states of metals were observed by X-ray photoelectron spectra (XPS) to discuss the active sites for the hydrogenation especially selective to the sulfur species.


Industrial & Engineering Chemistry Research | 1995

Hydrodesulfurization Reactivities of Narrow-Cut Fractions in a Gas Oil

Xiaoliang Ma; Kinya Sakanishi; Takaaki Isoda; Isao Mochida


Energy & Fuels | 1995

Quantum Chemical Calculation on the Desulfurization Reactivities of Heterocyclic Sulfur Compounds

Xiaoliang Ma; Kinya Sakanishi; Takaaki Isoda; Isao Mochida


Energy & Fuels | 1996

Structural characteristics and removal of visible-fluorescence species in hydrodesulfurized diesel oil

Xiaoliang Ma; Kinya Sakanishi; Takaaki Isoda; Shinichi Nagao; Isao Mochida


Preprints of Papers, American Chemical Society, Division of Fuel Chemistry | 1995

Selective hydrodesulfurization of 4,6-dimethyl dibenzothiophene in the major presence of naphthalene over molybdenum based binary and tertiary sulfides catalysts

Takaaki Isoda; Shinichi Nagao; Xiaoliang Ma


Archive | 1995

Selective hydrodesulfurization of 4,6-dimethyl-dibenzothiophene in the dominant presence of naphthalene over hybrid CoMo/AlâOâ and Ru/AlâOâ catalysts

Takaaki Isoda; Shinichi Nagao; Xiaoliang Ma


Preprints-American Chemical Society Division of Petroleum Chemistry | 1994

Hydrodesulfurization reactivities of alkylbenzothiophenes over sulfided molybdenum based catalysts

T. Isoda; Xiaoliang Ma; I. Mochida

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Kinya Sakanishi

National Institute of Advanced Industrial Science and Technology

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