Properties of polymeric zirconium phosphates as Friedel-Crafts catalysts

Costa, Magda; Johnstone, R. A. W.; Whittaker, D.

doi:10.1016/1381-1169(95)00123-9

Cited by 23 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the literature, some metal carbonates, phosphates, and sulfates have been used as supports to load metals [2]. From the examples on the catalytic applications of metal phosphate-based catalysts cited in the Introduction section [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,…”

Section: Resultsmentioning

confidence: 99%

“…In a classic book written by Tanabe, Misono, Ono, and Hattori, metal phosphates are highlighted as a new family of solid acids showing some promising applications in heterogeneous catalysis [3]. Metal phosphates can be used as catalysts directly, for instance, in the partial oxidation of propane [4], oxidative dehydrogenation of isobutane to isobutene [5,6,7], oxidative dehydrogenation of ethylbenzene to styrene [8], dehydration of cyclohexanol and 1-methylcyclohexanol [9,10,11], retro-Prins reaction [12,13], terpene rearrangements [14], alkylation of anisole with alcohols [15], dehydrofluorination of CF 3 CH 3 into CF 2 CH 2 [16,17], hydrolysis of CCl 2 F 2 [18,19,20], decomposition of CF 4 [21,22], decomposition of CH 2 FCF 3 [23], decomposition of chlorobenzene [24], decomposition of SF 6 [25,26], and hydrolysis of NF 3 [27]. …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

View full text Add to dashboard Cite

Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca10(PO4)6(OH)2, denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N2 adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2 temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In recent years, the modification of the interlayer region of α-ZrP to give solids composed of alternating inorganic and organic layers by intercalation/in situ formation of organic polymers has also received significant attention . Zirconium phosphate is also active as a catalyst. − …”

Section: Introductionmentioning

confidence: 99%

Nanostructured Inorganically Pillared Layered Metal(IV) Phosphates

et al. 1996

View full text Add to dashboard Cite

This article reviews the synthesis, characterization and ion-exchange, ion-transport, sorptive, and catalytic properties of inorganically pillared layered metal(IV) phosphates, typified by Zr(HPO 4 ) 2 ‚H 2 O. Porous nanostructures are generally prepared from metal(IV) phosphates either by ion exchange of polynuclear species or by intercalation from solutions of condensed species obtained by the hydrolysis of organometallic precursors using sol-gel methods, followed by thermal treatment to eliminate organic moieties, condense hydroxyl groups, eliminate water, and consolidate the structure by grafting the pillar to the layer. The different strategies devised to overcome the problem presented by the high layer charge density of R-and γ-structured phosphates in obtaining porous solids, including exfoliation and local surface growth of pillaring ions, and modification of the zirconium phosphate matrix to reduce the cation-exchange capacity, are described. Structural and textural characteristics of Al, Cr, mixed Al-Cr, Fe-Cr, Ga-Al and of Si-pillared phosphates obtained from XAFS, XPS, and MAS NMR are presented, and the perspectives of nanocomposite pillared layered solids in general are discussed in the current context of mesoporous solids synthesized using templating routes.

show abstract

“…The hydrothermally synthesized microporous niobium phosphate catalyst was found to exhibit high activity in the reaction, mainly due to the large amount of B acid sites on the large surface area. 12 Costa et al 34 reported that the amorphous zirconium phosphate showed the higher activity in Friedel−Crafts alkylation of anisole than the crystalline one because the amorphous zirconium phosphate had more accessibility of acid sites. Sinhamahapatra et al 35 found that the mesoporous zirconium phosphorate showed higher catalytic activity in Friedel−Crafts benzylation reaction than the conventional layered ZrP, owing to the mesoporous zirconium phosphorate having high specific surface area and reasonable acidity.…”

Section: Resultsmentioning

confidence: 99%

Properties and Reactivity of Fe–P–O Catalysts Prepared by Different Methods for Benzylation of Benzene

Zhang

Lin

et al. 2012

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Fe–P–O catalysts were prepared by four different methods, and their catalytic performances were tested in the benzylation of benzene with benzyl chloride. In addition, the properties of these catalysts were characterized by powder X-ray diffraction (XRD), N2 isothermal adsorption–desorption, scanning electronic microscopy (SEM), pyridine adsorbed infrared spectroscopy (Py-IR), and X-ray photoelectron spectroscopy (XPS) techniques. The preparation methods and component significantly modified the acidity, structure, and morphology of Fe–P–O catalysts, which in turn affected the catalytic reactivity of these catalysts in the benzylation reaction. Sol–gel synthesized Fe–P–O catalyst with P/Fe = 0.25 (atomic ratio) (FeP-0.25-SG) not did only exhibit the highest activity among these as-prepared catalysts, but also its reactivity was almost constant even after six reactions cycled. The interaction of Fe and P occurred in sol–gel prepared Fe–P–O catalysts. Such interaction modified the Lewis acidity of these catalysts, due to the redistribution of the charges and the formation of the Fe3+/Fe2+ couple. The density of weak and medium Lewis acid sites on these catalysts was close relative to the reactivity of these Fe–P–O catalysts. FeP-0.25-SG showed the highest catalytic performance among these catalysts, owing to a large density of weak and medium Lewis acid sites on the large-surface-area small-size catalyst.

show abstract

Properties of polymeric zirconium phosphates as Friedel-Crafts catalysts

Cited by 23 publications

References 19 publications

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Nanostructured Inorganically Pillared Layered Metal(IV) Phosphates

Properties and Reactivity of Fe–P–O Catalysts Prepared by Different Methods for Benzylation of Benzene

Contact Info

Product

Resources

About