Transformation of lower alkanes into aromatic hydrocarbons over ZSM-5 zeolites.

Ono, Yoshio; Kitagawa, H.; Sendoda, Yoko

doi:10.1627/jpi1958.30.77

Cited by 52 publications

(23 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, Zn 2? ) exhibited Lewis acid properties over zeolite [17,18]. After the impregnation of element Ga, zeolite acid sites appeared to be weaker than parent zeolite, and only weak acid sites existed [17].…”

Section: Introductionmentioning

confidence: 99%

“…The acidity of catalyst plays an important role in catalytic activity through MTO reaction, and acid adjustment is the most significant affecting factor for product distribution and catalytic stability [10][11][12][13][14][15][16][17][18]. Many methods could adjust the catalysts acid properties for a better catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Zn containing H-ZSM-5 zeolite catalyst showed a remarkable change in acidity properties, the number of strong acid sites decreased due to the impregnation of Zn 2? [18]. Abramova reported that the impregnation of magnesium decreased the amount of total acid sites and strong acid sites, as a result, enhanced the catalytic stability [19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

et al. 2015

View full text Add to dashboard Cite

H-ZSM-5-based catalyst is a recognized catalyst which is particularly selective towards the formations of light olefins in the methanol reaction. A series of H-ZSM-5 (SiO 2 /Al 2 O 3 = 38) modified with different amounts of magnesium have been investigated. All the samples were characterized by X-ray diffraction instrument (XRD), temperature-programmed desorption of NH 3 (NH 3 -TPD) and Fourier Transform Infrared Spectoscopy (FT-IR). The results indicated that the impregnation of H-ZSM-5 (SiO 2 /Al 2 O 3 = 38) zeolite with various magnesium loading amount significantly affected the strength of acid sites and decreased the concentration of both weak and strong acid sites. As a result of modification, magnesium mainly interacted with strong Brønsted acid sites, thus generated new medium strong acid sites and enhanced the yield of propylene. The optimum acid property for methanol to propylene (MTP) reaction was gotten over 4.0 Mg-ZSM-5 (4.0 wt% Mg) zeolite catalyst. The maximum yield of propylene was 10.62 wt% over 4.0 Mg-ZSM-5 zeolite catalyst by the 30 min on stream. Coke which was mostly formed on strong Brønsted acid sites, would cause the catalysts deactivation, so the reduction of strong Brønsted acid sites could enhance the catalytic stability.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In order to alleviate this severe situation, the conception of methanol to aromatic (MTA) via coal and natural gas routes has been put forward a few years ago, which was derived from the notion of methanol to gasoline (MTG) [2][3][4][5]. The most frequently employed active component for MTA is HZSM-5 zeolite because of its peculiar three-dimensional network which is particularly selective towards the formation of aromatics [6][7][8]. After the proposal of MTA was lifted, many efforts have been made to investigate the MTA process with respecting to both reaction conditions and catalyst modifications.…”

Section: Introductionmentioning

confidence: 99%

Effect of γ-alumina as active matrix added to HZSM-5 catalyst on the aromatization of methanol

Chen

Zhang

et al. 2015

Appl Petrochem Res

View full text Add to dashboard Cite

HZSM-5-based catalyst is a recognized catalyst which is particularly selective towards the formations of aromatics in the methanol reaction. However, studies on HZSM-5-based catalyst were mainly focused on the addition of metallic or/and nonmetallic element. Quite few studies have reported the effect of active matrix such as calumina on the aromatization of methanol. In this study, calumina was introduced into HZSM-5-based catalyst for the purpose of investigating the effect of c-alumina in methanol to aromatics reaction. The catalysts were characterized by X-ray diffraction, Temperature-programmed Desorption of NH 3 (NH 3 -TPD), Pyridine adsorption FT-IR diffuse reflection spectroscopy and adsorption-desorption measurements of nitrogen, respectively. Characterizations showed that the introduction of c-alumina increased the amount of mesopores and acid sites in the catalyst. The experimental mainly includes two parts. Firstly, separate reaction performances over the catalyst with/without calumina and c-alumina showed that c-alumina could significantly promote the formations of aromatics. However, c-alumina alone could merely convert methanol to dimethyl ether with a minor quantity of gaseous hydrocarbons. Acid properties showed that the introduction of c-alumina increased the percentage of Lewis acid on catalyst surface and enhanced acid strength, as a result, promoted the production of active intermediates which was essential for aromatic formation. The rise of aromatics selectivity might be caused by the combined effect of acid site density and acid strength. Follow-up work was mainly focused on the effect of the loading amount and loading order of the catalyst with c-alumina. Results indicated that the total aromatic yield increased gradually with the increasing amount of catalyst with c-alumina regardless of the loading order of the catalyst with c-alumina. Gasoline compositions showed that the increased aromatics were at the expense of paraffins, olefins, and naphthenes. Besides, all single aromatic hydrocarbons increased gradually with the increasing amount of catalyst with c-alumina. And the aromatics had a larger variation change when methanol first passed through the catalyst with c-alumina.

show abstract

“…20,21) The residual carbon yield of a number of thermoplastics has been reported during pyrolysis at 740°C as: Polyvinylchloride (PVC) -9%; Polyethylene (PE) -1.8%; Polypropylene (PP) -1.6%; Polystyrene (PS) -0.6%. Chars produced during pyrolysis at 850°C in N2 atmosphere from PVC, PE and PP were determined to be 5.9%, 0.2% and 2.3% respectively.…”

Section: Introductionmentioning

confidence: 99%

Recycling Waste Bakelite as an Alternative Carbon Resource for Ironmaking Applications

et al. 2014

View full text Add to dashboard Cite

In-depth investigations were carried out on the thermal degradation and structural evolution of bakelite by heat treatment at different temperatures; the structural transformation to graphitic carbon at 1 450°C was confirmed through X-ray diffraction. High amounts of residual carbon were obtained after the high temperature charring of bakelite. The reduction behavior of iron oxide/bakelite composite pellets was studied at 1 450°C to investigate waste bakelite as a carbon resource in ironmaking towards a partial replacement of traditional carbon sources. These studies were carried out for raw bakelite as well as for bakelite char. The reduction of iron oxide by raw bakelite resulted in the non-separation of metal, slag and in the formation of direct reduced iron pellets. On the other hand, bakelite char pellet showed clear separation of iron nuggets from slag. This study has established bakelite as an alternative carbonaceous resource for reduction reactions in new ironmaking processes.

show abstract

Transformation of lower alkanes into aromatic hydrocarbons over ZSM-5 zeolites.

Cited by 52 publications

References 0 publications

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

Effect of γ-alumina as active matrix added to HZSM-5 catalyst on the aromatization of methanol

Recycling Waste Bakelite as an Alternative Carbon Resource for Ironmaking Applications

Contact Info

Product

Resources

About