Oxidative coupling of methane using non-stoichiometric lead hydroxyapatite catalyst mixtures

Park, Jai Hyun; Lee, Dae Won; Im, Sung Woo; Lee, Yong Hee; Suh, Dong Jin; Jun, Kil-Woung; Lee, Kwan Young

doi:10.1016/j.fuel.2011.08.056

Cited by 30 publications

(33 citation statements)

References 33 publications

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“…The Pb 4f XPS results at pH 4.0-6.0 were the same as pH 3.0. It suggested the possibility of Pb 2+ substitution for Ca 2+ and the forming of Ca 10Àx Pb x (PO 4 ) 6 (OH) 2 at pH 3.0-6.0 [30,31]. However, the Pb 4f spectra were obviously composed with two chemical states when the pH was 2.0.…”

Section: Sorption Mechanismmentioning

confidence: 99%

Monodisperse magnetic hydroxyapatite/Fe3O4 microspheres for removal of lead(II) from aqueous solution

Zhuang

Tan

Shen

et al. 2015

Journal of Alloys and Compounds

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Section: Sorption Mechanismmentioning

confidence: 99%

Monodisperse magnetic hydroxyapatite/Fe3O4 microspheres for removal of lead(II) from aqueous solution

Zhuang

Tan

Shen

et al. 2015

Journal of Alloys and Compounds

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“…For the catalysts of major contents of nickel (8 and 10%), reduction begins at a temperature of approximately 300°C, but extends up to temperatures of 700 and 750°C, having several peaks at temperatures around 410, 505, 620 and 720°C [64]. The temperature-programmed reduction of a nickel catalyst (13.5 wt%) supported on commercial hydroxyapatite (Sigma-Aldrich) runs in a much wider temperature range [51]. Although the shape of the curve of the reduction is very similar to the TPR curve of Ni(10.0)/DHAp (Fig.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…Calcium-deficient (non-stoichiometric) HAp is given by the formula Ca 10-x (HPO 4 ) x (PO 4 ) 6-x (OH) 2-x (x is the number of cationic vacancies) [47]. The catalytic activity of calcium hydroxyapatite has been reported, for example, in the removal of oxygenated volatile organic compounds [47] or the oxidative coupling of methane [51].…”

Section: Introductionmentioning

confidence: 99%

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

Cichy

Dobosz

Borowiecki

et al. 2017

Reac Kinet Mech Cat

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This paper presents reports on the glycerol steam reforming reaction. The studies were performed over four nickel catalysts with different metal loading (up to 10 wt%) supported on calcium deficient hydroxyapatite (DHAp). The support was synthetized by the microwave assisted hydrothermal method. The steam reforming reaction was performed under atmospheric pressure in the 650-800°C temperature range using 10 mg of catalyst sample and a glycerol/water mixture with S/C = 3. All catalysts were well characterized by physicochemical methods (XRD, XRF, TPR, HRTEM). The catalytic tests results were presented by means of glycerol conversion, hydrogen and carbon containing gases selectivity. The most promising results were obtained for catalyst with moderate Ni content (*7.5 wt%), which proved to be stable during a few hours on-stream and provided glycerol conversion at least 94% at reaction temperature above 750°C.

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“…Puncak lain yang tidak sesuai dengan database diduga karena masih adanya kontaminan pada hidroksiapatit. Adanya modifikasi dengan Fe dapat meningkatkan intensitas yang dihasilkan dan puncak yang dihasilkan lebih mendekati puncak tertinggi hidroksiapatit murni (Park et al, 2012). Adanya modifikasi dengan Fe dalam hidroksiapatit dapat menyebabkan tergantikannya ion Ca pada struktur hidroksiapatit oleh kation Fe 2+ , sehingga mengakibatkan pergeseran difraksi Fe pengganti Ca dalam struktur tersebut.…”

Section: Gambar 1 Difraktogram Xrd Serbuk Tulang (T0)unclassified

HIDROKSIAPATIT TERMODIFIKASI Fe DAN APLIKASINYA UNTUK ADSORPSI ZAT WARNA CONGO RED

Septiari¹,

Simpen²,

Suastuti³

2017

Jurnal Kimia

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ABSTRAKPenelitian ini tentang adsorpsi zat warna congo red oleh hidroksiapatit hasil dekomposisi termal 400 o C (TA1) dan hidroksiapatit hasil dekomposisi termal 400 o C termodifikasi Fe (TA2). Penelitian ini meliputi ekstraksi hidroksiapatit dari tulang secara dekomposisi termal, penentuan jumlah situs aktif hidroksiapatit secara titrasi asam basa, luas permukaan secara metode sorpsi biru metilen, perbandingan unsur Ca/P dianalisis menggunakan laser induced breakdown spectroscopy(LIBS), kristalinitas secara difraksi sinar-X (XRD), penentuan waktu setimbang adsorpsi congo red, isoterm adsorpsi dan kapasitas adsorpsi congo red tanpa dan dengan penambahan H2O2 menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa jumlah situs aktif hidroksiapatit tertinggi ditunjukkan oleh TA1 yaitu 19,3493x10 23 situs/gram dan luas permukaan tertinggi ditunjukkan oleh TA1 yaitu 26,5375 m 2 /g. Perbandingan unsur Ca/P yang dihasilkan oleh TA1 yaitu 1,6425 sesuai literatur (1,67). TA2 menghasilkan puncak XRD yang lebih mendekati puncak hidroksiapatit murni dengan intensitas 100 yang memiliki sudut 2 31,99 o . Secara umum adsorpsi congo red tanpa dan dengan penambahan H2O2 terjadi peningkatan kapasitas teradsorpsi seiring dengan bertambahnya konsentrasi congo red dan lebih tinggi dibandingkan serbuk tulang kontrol (T0). ABSTRACTThis research paper discusses the adsorption of congo red by hydroxyapatite resulted from thermal decomposition at 400 o C (TA1) and hydroxyapatite resulted from thermal decomposition at 400 o C with Fe modification (TA2). This studies involved the extraction of hydroxyapatite by thermal decomposition, determinations of the number of hydroxyapatite active sites by acid-base titration, surface area by the sorption of methylene blue, ratio of Ca/P elements analized by laser induced breakdown spectroscopy(LIBS), crystallinity by Xray diffraction (XRD), determination of equilibrium adsorption time, adsorption isotherms and adsorption capacity of congo red with and without the addition of H2O2analized by UV-Vis spectrophotometer. The results showed that the highest number of hydroxyapatiteactive sites and surface area of TA1were 19.3493x10 23 sites/gram and 26.5375 m 2 /g, respectively. The ratio of Ca/P elements produced by TA1 was 1.6425 which was in accordance to the reference. The XRD peaksof TA2 was closer to the pure hydroxyapatite with an intensity 100 which had 2θ angle of 31.99 o . Generally, the adsorption of congo red with and without the addition of H2O2 showed an increase in the amount adsorbed with the increase of the concentrations of congo red and this was higher than the control (T0).

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Oxidative coupling of methane using non-stoichiometric lead hydroxyapatite catalyst mixtures

Cited by 30 publications

References 33 publications

Monodisperse magnetic hydroxyapatite/Fe3O4 microspheres for removal of lead(II) from aqueous solution

Monodisperse magnetic hydroxyapatite/Fe3O4 microspheres for removal of lead(II) from aqueous solution

Glycerol steam reforming over calcium deficient hydroxyapatite supported nickel catalysts

HIDROKSIAPATIT TERMODIFIKASI Fe DAN APLIKASINYA UNTUK ADSORPSI ZAT WARNA CONGO RED

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