Insights into novel mesoporous Cu-SAPO-34 with enhanced deNOx performance for diesel emission control

Mi, Yangyang; Li, Gang; Zheng, Yu; Luo, Yiwei; Liu, Wenming; Li, Zhenguo; Wu, Daishe; Peng, Honggen

doi:10.1016/j.micromeso.2021.111245

Cited by 21 publications

(10 citation statements)

References 62 publications

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“…The peak at about 100 °C represents the preadsorbed NH 3 molecules on weak Lewis acid sites of SAPO-34, the peak at 170 °C is ascribed to the medium Lewis acid sites due to introduction of copper ions and the peak at about 400 °C corresponds to NH 3 molecules adsorbed on strong Brønsted acid sites of SAPO-34. 17,40,41 The acid amounts were calculated according to the desorption peak area in Fig. 5(C).…”

Section: Results Of Nmr Analysis and Aciditymentioning

confidence: 99%

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

Cao

Chen

Dong

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND A series of Cu‐SAPO‐34 samples were prepared with different copper sources and addition of tetraethylenepentamine (TEPA) by a one‐pot method, which were applied for selective catalytic reduction of NOx with ammonia (NH3‐SCR). RESULTS Various measurements were carried out to investigate the effect of TEPA addition and copper sources used on sample properties. The results indicated that Cu‐SAPO‐34 obtained with the addition of TEPA using copper citrate (Cu‐SAPO‐34‐TC) displayed over 90% NOx conversion at 150–500 °C and excellent H2O and SO2 resistance in NH3‐SCR. This is because the addition of TEPA can control the formation of isolated Cu2+ species located at the junction of D6R in CHA cage, Site (I), which is regarded as a more easily approachable site to adsorbates (NH3 and NO) than others, thus leading to the excellent NH3‐SCR performance. Further study demonstrated that the Cu‐SAPO‐34‐TC catalyst shows much wider temperature window and more hydrothermal stability due to a greater amount of surface isolated Cu2+, fewer Si islands and more Al(IV) species. CONCLUSIONS The excellent activity of the Cu‐SAPO‐34‐TC catalyst can be attributed to the addition of TEPA, which is beneficial for controlling the isolated Cu2+ at Site (I) as well as inhibiting the aggregation of CuO species. Various characterizations also confirm that more surface Cu2+ can be produced using copper citrate as copper source. © 2022 Society of Chemical Industry (SCI).

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Section: Results Of Nmr Analysis and Aciditymentioning

confidence: 99%

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

Cao

Chen

Dong

et al. 2022

J of Chemical Tech & Biotech

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“…12). Otherwise, Li et al 15 and Mi et al 13 claimed that the generation of mesopores increases the specific surface area.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, Liu et al 12 applied a hydrothermal method by using Cu-tetraethylenepentamine (TEPA) and N , N -diisopropylethylamine (DIPEA) in the preparation of micro-/mesoporous Cu-SAPO-34. In other successful examples, the micro-/mesoporous SAPO-34 was also prepared by using MOR and the long-chain organic compound: [C 22 H 45 –N + (CH 3 ) 2 –C 6 H 12 –N + (CH 3 ) 2 –C 6 H 13 ]Br 2 (C 22-6-6 –Br 2 ), 13 or a hard-template method using CaCO 3 . 14,15 An enhanced activity (compared to conventional Cu-SAPO-34) of the catalyst (>80% NO conversion in the range of 150–500 °C) is attributed to the improved accessibility of reactants to catalytically active sites.…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic reduction of NO_x over micro-/meso-/macroporous Cu-SAPO-34

Jabłońska

Góra‐Marek

Lukman

et al. 2022

Catal. Sci. Technol.

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“…However, traditional SAPO-34 has a small pore size and is prone to carbon deposition and deactivation in catalytic reaction of bulky organic molecules, which cannot meet the needs of the development of the chemical industry ( Zhong et al, 2017 ; Kim et al, 2021 ; Zhang et al, 2021 ). To cope with these shortcomings, several strategies have been developed to improve the diffusion limitation of SAPO-34, such as synthesis of nano-sized mesopore-containing SAPO-34 ( Yang et al, 2014 ; Sun et al, 2018 ; Mi et al, 2021 ). Hierarchical porous SAPO-34 can be synthesized by post-treatment, such as acid or alkali treatment, in which the skeleton cations were removed selectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical Porous SAPO-34 and Its Catalytic Activity for 4,6-Dimethyldibenzothiophene

et al. 2022

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Zeolite SAPO-34 has been widely used in the industry because of its special pore structure and wide distribution of acid sites in the pore channel. However, traditional SAPO-34 with a small pore size suffers from carbon deposition and deactivation in catalytic reactions, and its inability to catalytically convert bulky organic molecules limits its industrial application. Meanwhile, impurities of SAPO-5, which have weak acidity leading to rapid catalyst deactivation, appear in SAPO-34 zeolite. Therefore, it is of great significance to synthesize SAPO-34 zeolite with a mesoporous pore structure, which can significantly improve the transfer of molecules in zeolites. In this paper, SAPO-34 zeolite with a hierarchical pore structure was synthesized, and its hydrodesulfurization performance for 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied in a fixed bed reactor. The characteristic results show that BET-specific surface area, micropore volume, and mesoporous volume of synthesized SAPO-34 are 754 m2 g−1, 0.25, and 0.23 cm3 g−1 respectively, and the pore size is mainly concentrated at 4 nm. The catalytic conversion of 4,6-DMDMT with Co- and Mo-supported SAPO-34 is about 83%, which is much higher than the catalytic performance of Al2O3.

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Insights into novel mesoporous Cu-SAPO-34 with enhanced deNOx performance for diesel emission control

Cited by 21 publications

References 62 publications

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

Selective catalytic reduction of NO_x over micro-/meso-/macroporous Cu-SAPO-34

Synthesis of Hierarchical Porous SAPO-34 and Its Catalytic Activity for 4,6-Dimethyldibenzothiophene

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Insights into novel mesoporous Cu-SAPO-34 with enhanced deNOx performance for diesel emission control

Cited by 21 publications

References 62 publications

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NOx with NH3

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NOx with NH3

Selective catalytic reduction of NOx over micro-/meso-/macroporous Cu-SAPO-34

Synthesis of Hierarchical Porous SAPO-34 and Its Catalytic Activity for 4,6-Dimethyldibenzothiophene

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Product

Resources

About

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

One‐pot facile synthesis of Cu‐SAPO‐34 via addition of tetraethylenepentamine and its enhanced catalytic activity in selective catalytic reduction of NO_x with NH₃

Selective catalytic reduction of NO_x over micro-/meso-/macroporous Cu-SAPO-34