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Tan, P. L.; Leung, YK; Lai, Su‐Yuan; Au, Chak Tong

doi:10.1023/a:1014956501472

Cited by 50 publications

(35 citation statements)

References 22 publications

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“…It has been reported that coke formation can be reduced by means of adding some CO 2 and O 2 to the feed stream, resulting in an improvement of the catalytic performance of the catalyst [15][16][17]. Analogous to CO 2 , H 2 O may also be a good reagent that removes coke accumulation on the zeolite catalyst by the reforming reaction (H 2 O+CHv (v=0-4)=CO+H 2 ).…”

Section: Introductionmentioning

confidence: 99%

Butene Catalytic Cracking to Propene and Ethene over Potassium Modified ZSM-5 Catalysts

et al. 2005

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Catalytic cracking of butene over potassium modified ZSM-5 catalysts was carried out in a fixed-bed microreactor. By increasing the K loading on the ZSM-5, butene conversion and ethene selectivity decreased almost linearly, while propene selectivity increased first, then passed through a maximum (about 50% selectivity) with the addition of ca. 0.7-1.0% K, and then decreased slowly with further increasing of the K loading. The reaction conditions were 620°C, WHSV 3.5 h )1 , 0.1 MPa 1-butene partial pressure and 1 h of time on stream. Both by potassium modification of the ZSM-5 zeolite and by N 2 addition in the butene feed could enhance the selectivity towards propene effectively, but the catalyst stability did not show any improvement. On the other hand, addition of water to the butene feed could not only increase the butene conversion, but also improve the stability of the 0.7%K/ZSM-5 catalyst due to the effective removal of the coke formed, as demonstrated by the TPO spectra. XRD results indicated that the ZSM-5 structure of the 0.07% K/ZSM-5 catalyst was not destroyed even under this serious condition of adding water at 620°C.

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Section: Introductionmentioning

confidence: 99%

Butene Catalytic Cracking to Propene and Ethene over Potassium Modified ZSM-5 Catalysts

et al. 2005

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“…The NH 3 -TPD curve of HZSM-5, exhibits two separate peaks at 523 K and 743 K which are attributed to weak and strong acid sites. The existence of the peaks has been reported for the acid characterization of HZSM-5 by the NH 3 -TPD method [16,17]. Unlike HZSM-5, the Table 2 The amount of NH 3 TPD curves of Hb and USY show a major peak at temperature 523 K and a shoulder peak at temperature around 623 K and 653 K for Hb and USY, respectively.…”

Section: Correlation Between Activity and Characterization Of Supportmentioning

confidence: 77%

“…The results in figure 4 shows that the activity of catalyst is improved significantly after introducing 2% O 2 in methane feed. It has been reported by several authors [1,6,8,17,19] that the addition of a suitable amount of oxidants such as CO, CO 2 and O 2 into methane feed resulted in remarkable enhancement in the catalyst activity and stability due to suppression of coke deposited in the catalyst. In the oxidative condition, the aromatics and C 2 -hydrocarbons products accompanied by COx (CO and CO 2 ) as side-products were detected, whilst in the non-oxidative condition, the aromatic and C 2 -hydrocarbons were detected with negligible amount of COx.…”

Section: Resultsmentioning

confidence: 99%

“…Dehydroaromatization of methane (DHAM) to aromatics have received considerable attentions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] in the study of catalytic reactions. The most common catalysts reported to be promising for DHAM are HZSM-5-supported Mo and also W catalysts [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The most common catalysts reported to be promising for DHAM are HZSM-5-supported Mo and also W catalysts [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Some of the characteristics of an active DHAM catalyst include a highly dispersed active metal species on the surface and also a proper amount of acidity for the support [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dual effects of supported W catalysts for dehydroaromatization of methane in the absence of oxygen

Kusmiyati

Amin

2005

Catal Lett

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The screening of a series of W-based catalysts on different supports i.e. HZSM-5, Hb, USY and Al 2 O 3 for the dehydroaromatization of methane (DHAM) revealed that HZSM-5 emerged as the best support. Next, the performance of W/ HZSM-5 and W-H 2 SO 4 /HZSM-5 catalysts for the DHAM reaction was compared to study the effect of acidic treatment in the impregnation method. The results showed that the optimum activity of W-H 2 SO 4 /HZSM-5 catalyst exceeded that of W/HZSM-5 catalyst. Finally, the influence of Si/Al ratio in the W-H 2 SO 4 /HZSM-5 catalyst was studied and the catalyst with Si/Al ratio = 30 was found to be the most promising for the DHAM reaction. The remarkable activity of the catalyst is attributed to the presence of dual effects: suitable content of octahedral polymeric and tetrahedral monomeric tungstate species accompanied by proper amount and strength of acid sites in the catalyst.

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Nonoxidative Dehydroaromatization of Methane

Hensen

2017

Nanotechnology in Catalysis

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Untitled

Cited by 50 publications

References 22 publications

Butene Catalytic Cracking to Propene and Ethene over Potassium Modified ZSM-5 Catalysts

Butene Catalytic Cracking to Propene and Ethene over Potassium Modified ZSM-5 Catalysts

Dual effects of supported W catalysts for dehydroaromatization of methane in the absence of oxygen

Nonoxidative Dehydroaromatization of Methane

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