Steam reforming of dimethyl ether over ZSM-5 coupled with Cu/ZnO/Al2O3 catalyst prepared by homogeneous precipitation

Kawabata, Tomonori; Matsuoka, Hiromichi; Shishido, Tetsuya; Li, Dalian; Tian, Yan; Sano, Tsuneji; Takehira, Katsuomi

doi:10.1016/j.apcata.2006.04.032

Cited by 103 publications

(52 citation statements)

References 22 publications

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“…This phenomenon could be caused by agglomeration of copper particles. It was reported that Cu-based catalysts could easily be deactivated, caused by agglomeration of copper particles when reaction temperatures are over 300˝C [57]. Figure 13 shows SEM micrograph and EDX mapping of Ni 0.5 -Cu 0.5 /Al 2 O 3 catalysts after 30 h on steam.…”

Section: Effect On Catalytic Performancementioning

confidence: 99%

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

2016

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Abstract:The performance of Ni-Cu/Al 2 O 3 catalysts for steam reforming (SR) of gasoline to produce a hydrogen-rich gas mixture applied in a spark ignition (SI) engine was investigated at relatively low temperature. The structural and morphological features and catalysis activity were observed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and temperature programmed reduction (TPR). The results showed that the addition of copper improved the dispersion of nickel and therefore facilitated the reduction of Ni at low temperature. The highest hydrogen selectivity of 70.6% is observed over the Ni-Cu/Al 2 O 3 catalysts at a steam/carbon ratio of 0.9. With Cu promotion, a gasoline conversion of 42.6% can be achieved at 550˝C, while with both Mo and Ce promotion, the gasoline conversions were 31.7% and 28.3%, respectively, higher than with the conventional Ni catalyst. On the other hand, initial durability testing showed that the conversion of gasoline over Ni-Cu/Al 2 O 3 catalysts slightly decreased after 30 h reaction time.

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Section: Effect On Catalytic Performancementioning

confidence: 99%

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

2016

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“…In some cases the acidity of the bifunctional catalysts presented a lower value than expected due to the partial blockage of acid sites by the methanol synthesis component [23]. Kawabata et al [24] demonstrated that the performance of a bifunctional catalyst made up of CZA and HZSM-5 zeolite was improved by preparing it by physically mixing both components and then pelletizing. Wang et al [19] looked at the synergistic effect of physically mixing methanol synthesis and dehydration catalysts.…”

Section: Introductionmentioning

confidence: 99%

Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

Abu‐Dahrieh

Rooney

Goguet

et al. 2012

Chemical Engineering Journal

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“…Even though methanol SR was easily performed at low temperature, methanol is not only biologically toxic in nature but also incompatible with the developed infrastructure especially for automobiles. In this regard, SR of dimethyl ether (DME) becomes one of the recent research interests (Takeishi and Suzuki, 2004;Tanaka et al, 2005;Faungnawakij et al, 2006;Kawabata et al, 2006;Semelsberger et al, 2006). DME can be reformed to hydrogen at low temperature, easily handled, and stored due to similar physical properties to liquefied petroleum gases (LPG).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the endothermicity of RWGS, a lower reaction temperature is favored for lower CO selectivity. Although many efforts (Faungnawakij et al, 2006;Kawabata et al, 2006;Semelsberger et al, 2006) have been made to control the acidity of hybrid catalysts, it is desirable to continue more systematic study about the solid acids for better production of hydrogen especially at lower temperature.…”

Section: Introductionmentioning

confidence: 99%

Acidity Control of Al-SBA-15 and Its Effect on the Catalytic Performance for Steam Reforming of Dimethyl Ether

Yun

Bazardorj

Ihm

2009

J. Chem. Eng. Japan

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Steam reforming (SR) of dimethyl ether (DME) seems to proceed via a successive two step mechanism: hydrolysis of DME over solid acid catalysts, followed by methanol SR over copper-based catalysts. Since the DME hydrolysis is rate-controlling, it is desirable to continue more systematic study concerning the solid acids for better production of hydrogen. In this work, the composites of mesoporous solid acid catalysts (Al-SBA-15) and copper-based catalysts (Cu/ZnO/Al 2 O 3 ) made the hybrid catalysts, and they were used for DME SR. Acidity of Al-SBA-15 was controlled by tuning Si/Al ratio, which should vary the number of acidic sites. The reducibility of hybrid catalysts was varied with different weight ratio between Al-SBA-15 and Cu/ZnO/Al 2 O 3 . The catalytic activity of DME SR was analyzed in terms of acid amount and copper reducibility.

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Steam reforming of dimethyl ether over ZSM-5 coupled with Cu/ZnO/Al2O3 catalyst prepared by homogeneous precipitation

Cited by 103 publications

References 22 publications

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

Low-Temperature Catalytic Performance of Ni-Cu/Al2O3 Catalysts for Gasoline Reforming to Produce Hydrogen Applied in Spark Ignition Engines

Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

Acidity Control of Al-SBA-15 and Its Effect on the Catalytic Performance for Steam Reforming of Dimethyl Ether

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