Dispersion of Inorganic Salts into Zeolites and Their Pore Modification

Xiao, Feng‐Shou; Zheng, Shan; Sun, Jianmin; Yu, Ranbo; Qiu, Shilun; Xu, Ruren

doi:10.1006/jcat.1998.2054

Cited by 64 publications

(29 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mou et al reported that such catalysts display higher catalytic activity in ethylbenzene dehydrogenation and also slower deactivation compared to impregnated catalysts [2]. Similar conclusions were reached by Xiao et al for the selective reduction of NO by propylene [3]. De Jong and co-workers prepared a set of Co/SiO 2 catalysts by melt infiltration, which displayed high activity in the Fischer-Tropsch synthesis reaction [4].…”

Section: Introductionmentioning

confidence: 63%

“…The use of nitric acid to selectively dissolve bulk and small CuO has been reported [6,24,38]. To facilitate the identification of Cu species, CuCe(1/4)/SHS, CuCe(1/4)/SHS-IMG and CuCe(1/8)/SHS were treated with HNO 3 . We infer that the second reduction peak is dominated by Cu ions in solid solution with ceria, because removal of CuO clusters/particles by HNO 3 treatment leads to a minor decrease of the second peak, whereas the first one totally disappears (Fig.…”

Section: Characterization Of Cuce(x)/shsmentioning

confidence: 99%

See 1 more Smart Citation

CO–PROX reactions on copper cerium oxide catalysts prepared by melt infiltration

Quek

Ligthart

et al. 2012

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 63%

Section: Characterization Of Cuce(x)/shsmentioning

confidence: 99%

CO–PROX reactions on copper cerium oxide catalysts prepared by melt infiltration

Quek

Ligthart

et al. 2012

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

“…The results show that ZrO 2 /½SO 2À 4 was successfully loaded into the inner pores of MCM-41 and the as-synthesized catalyst showed favorable catalytic properties. In this case, ½SO 2À 4 /ZrO 2 /MCM-41 retained well-ordered mesoporous structures due to the [27].…”

Section: Sulfated Zirconia Supported Into Mesoporous Materialsmentioning

confidence: 90%

Ordered Mesoporous Materials with Improved Stability and Catalytic Activity

Xiao

2005

Top Catal

Self Cite

View full text Add to dashboard Cite

Microporous crystals of zeolites such as Y, Beta, and ZSM-5 are widely used commercial catalysts, but their applications are strongly limited by their small pore sizes. Recent progress in solving this is used to ordered mesoporous materials such as MCM-41, HMS, and SBA-15. These mesoporous materials have pore diameters of 2.0-30 nm and exhibit good catalytic properties for the catalytic conversion of bulky reactants. However, when compared with microporous crystals of zeolites, the catalytic activity and hydrothermal stability are relatively low, which severely hinders their practical applications in industrial catalytic reactions such as petroleum cracking. The relatively low catalytic activity and hydrothermal stability can be attributed to the amorphous nature of the mesoporous walls. In this account, we systemically review the routes for improving catalytic activity and hydrothermal stability of mesoporous materials, which include (1) acidic sulfated zirconia supported in mesoporous materials; (2) strongly acidic and thermally stable mesostructured sulfated zirconia with tetragonal crystalline phase; (3) strongly acidic and hydrothermally stable mesoporous aluminosilicates synthesized in alkaline media; (4) strongly acidic and hydrothermally stable mesoporous aluminosilicates synthesized in strongly acidic media; (5) hydrothermally stable mesoporous titanosilicates with catalytically active titanium species in oxidations; (6) high-temperature generalized synthesis of ultrastable ordered mesoporous silica-based materials by using fluorocarbonhydrocarbon surfactant mixtures.

show abstract

“…For example, CuCl 2 /HZSM-5 catalyst is successfully prepared from dispersion of CuCl 2 into the pores of HZSM-5 with higher copper loading than CuZSM-5 prepared by ion exchange, and catalytic data in selective reduction of NO by propylene showed that CuCl 2 /HZSM-5 catalyst exhibits higher conversion at 300± 600 C than CuZSM-5 prepared by the ion-exchange method. [84,85] …”

Section: New Routes To Microporous Materialsmentioning

confidence: 99%

“…3) Metal oxides having no ion-exchange ability can be introduced into zeolites using the dispersion method. [84] [h] Dispersion of inorganic salts on zeolites was performed in vacuo as follows: i) zeolites were evacuated at 400±500 C to remove traces of water; ii) noble metal chlorides were mixed with the dehydrated zeolites in a glovebox filled with N 2 ; iii) the mixtures of the noble metal chlorides and the zeolites were heated at 100±150 C for 12±48 h under vacuum (10 ±4 torr).…”

Section: New Routes To Microporous Materialsmentioning

confidence: 99%