Delaminated Fe2O3-Pillared Clay: Its Preparation, Characterization, and Activities for Selective Catalytic Reduction of No by NH3

Chen, J.P.; Hausladen, M.C.; Yang, Ralph T.

doi:10.1006/jcat.1995.1016

Cited by 135 publications

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“…The contrasting data suggest that Fe/Bent-40 and Fe/Bent-60 form a house of cards structure, which is also evidenced by the presence of a modal pore at the pore size distribution. Fe/Bent-40 pore distribution exhibits the modal pore at approximately 60 Å instead of dominant pore sizes at approximately 25 Å while Fe/Bent-60 exhibits the modal pore at around 32 Å (Figure 3) [19,20]. The surface morphology of the materials also gives confirmation on the change of surface profile…”

Section: Bulletin Of Chemical Reaction Engineering and Catalysis 11 (3mentioning

confidence: 77%

Physicochemical and Photocatalytic Properties of Fe-Pillared Bentonite at Various Fe Content

Fatimah

Nurkholifah

2016

Bull. Chem. React. Eng. Catal.

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Iron-pillared bentonites (Fe/Bents) were successfully prepared using a ferric chloride precursor. The prepared samples were characterized using XRD, BET and SEM-EDX. The results show that the pillared bentonite physicochemical character is affected by the iron content in a precursor solution. By Fe content variation, it is found that Fe content in Fe/Bents is not linearly correlated with the specific surface area and the increased in d001 in which both the maximum specific surface are and d001 reach maximum at the Fe content of 20 mmol/g. Due to the kinetics of photocatalytic activity in phenol removal, it is concluded that in photo-Fenton-like processes.

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Section: Bulletin Of Chemical Reaction Engineering and Catalysis 11 (3mentioning

confidence: 77%

Physicochemical and Photocatalytic Properties of Fe-Pillared Bentonite at Various Fe Content

Fatimah

Nurkholifah

2016

Bull. Chem. React. Eng. Catal.

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“…The presence of water in the reaction mixture and the interaction between water molecules and the catalyst surface may also play an important role with regard to the catalytic properties [12][13][14]. For example, the surface acidity of the TiO 2 -pillared montmorillonite as shown by Long and Yang [7] influenced the SCR reaction.…”

Section: Introductionmentioning

confidence: 99%

Ammonia and water sorption properties of the mineral-layered nanomaterials used as the catalysts for NOx removal from exhaust gases

Olszewska

2006

Catalysis Today

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“…More specifically, the PILC based catalysts have been found to be excellent and H 2 O/SO 2 resistant catalysts for the SCR reactions by NH 3 and by hydrocarbons [60]. The PILCs alone showed NH 3 SCR activities [61], with Fe 2 O 3 -PILC exhibiting the highest activities [62]. Using TiO 2 -PILC as a support, a 3/1 (molar ratio) of Fe 2 O 3 /Cr 2 O 3 (total 10% wt.)…”

Section: Introductionmentioning

confidence: 99%

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Long¹,

Tharappiwattananon²,

Li³

et al. 2000

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Conclusion 973 DisclaimerThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views or opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. EXECUTIVE SUMMARYRemoval of NO x (NO + NO 2 ) from exhaust gases is a challenging subject. V 2 O 5 -based catalysts are commercial catalysts for selective catalytic reduction (SCR) with NH 3 for stationary sources. However, for diesel and lean-burn gasoline engines in vehicles, hydrocarbons would be the preferred reducing agents over NH 3 because of the practical problems associated with the use of NH 3 (i.e., handling and slippage through the reactor). The noble-metal three-way catalysts are not effective under these conditions. The first catalyst found to be active for selective catalytic reduction of NO by hydrocarbons in the presence of excess oxygen was copper exchanged ZSM-5 and other zeolites, reported in 1990 by Iwamoto in Japan and Held et al. in Germany. Although Cu-ZSM-5 is very active and the most intensively studied catalyst, it suffers from severe deactivation in engine tests, mainly due to H 2 O and SO 2 .In this project, we found that ion-exchanged pillared clays and MCM-41 catalysts showed superior SCR activities of NO with hydrocarbon. All Cu 2+ -exchanged pillared clays showed higher SCR activities than Cu-ZSM-5 reported in the literature. In particular, H 2 O and SO 2 only slightly deactivated the SCR activity of Cu-TiO 2 -PILC, whereas severe deactivation was observed for Cu-ZSM-5. Moreover, Pt/MCM-41 provided the highest specific NO reduction rates as compared with other Pt doped catalysts, i.e., Pt/Al 2 O 3 , Pt/SiO 2 and Pt/ZSM-5. ThePt/MCM-41 catalyst also showed a good stability in the presence of H 2 O and SO 2 . The results are described in detail in 4 chapters. 5In Chapter 1, we report SCR of NO by C 2 H 4 on ion-exchanged pillared clays, i.e., CuTiO 2 -PILC, Cu-Al 2 O 3 -PILC, Cu-ZrO 2 -PILC, Cu-Al 2 O 3 -Laponite, Fe-TiO 2 -PILC, Ce-TiO 2 -PILC, Co-TiO 2 -PILC, Ag-TiO 2 -PILC, Ga-TiO 2 -PILC. Cu-TiO 2 -PILC showed the highest activities at temperatures below 370 o C, while Cu-Al 2 O 3 -PILC was most active at above 370 o C, and both catalysts showed higher SCR activities than Cu-ZSM-5 reported in the literature.No detectable N 2 O was formed by all of these catalysts. The catalytic activity increased wi...

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Delaminated Fe2O3-Pillared Clay: Its Preparation, Characterization, and Activities for Selective Catalytic Reduction of No by NH3

Cited by 135 publications

References 0 publications

Physicochemical and Photocatalytic Properties of Fe-Pillared Bentonite at Various Fe Content

Physicochemical and Photocatalytic Properties of Fe-Pillared Bentonite at Various Fe Content

Ammonia and water sorption properties of the mineral-layered nanomaterials used as the catalysts for NOx removal from exhaust gases

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

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