Catalytic Performance of Noble Metals Supported on Alumina-modified Silica Gel for Hydrodesulfurization Reaction

Kanda, Yasuharu; Kobayashi, Takao; Uemichi, Yoshio; Sugioka, Masatoshi

doi:10.1627/jpi.49.49

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…Supported noble metal catalysts, especially platinum supported on zeolites 7),8), 12) and mesoporous silicates 9) 12) , had higher HDS activities than commercial CoMo/ Al2O3 HDS catalyst. We also reported that the HDS activities of Pt supported on silica gel (SiO2) 13) and mesoporous silica MCM-41 14), 15) were enhanced by alumina modification of the siliceous support. We concluded that the high activities of these catalysts were caused by the formation of both highly dispersed Pt particles and Brönsted acid sites on the supported Pt catalyst, which act as the active sites for the HDS of thiophene.…”

Section: Introductionmentioning

confidence: 85%

“…The effect of silica modifi cation on catalytic activity of Pt/Al2O3 was remarkably different from the effect of alumina modification on catalytic activity of Pt/SiO2. We previously reported that the dispersion of Pt on SiO2 was enhanced to about 0.8 with Al2O3 loading from 8 to 24 wt% 13) . Therefore, we performed detailed characterizations of Pt/SiO2 _ Al2O3 catalysts to clarify why the optimal amount of SiO2 loading for the HDS of thiophene was not observed.…”

Section: The Opt I M a L S I O2 L O A D I N G F O R T H E H D S A C Tmentioning

confidence: 98%

“…Previously, we proposed two reaction routes for HDS of thiophene over highly active Pt/Al2O3 _ SiO2 catalyst: (i) a monofunctional route in which HDS reactions proceed only on Pt particles, and (ii) a bifunctional route in which both Pt particles and Brönsted acid sites are involved in the HDS reaction 13) . In reaction route (ii), thiophene is activated on the Brönsted acid sites of Al2O3 _ SiO2 and hydrogen is activated on the Pt particles to form spillover hydrogen.…”

Section: The Opt I M a L S I O2 L O A D I N G F O R T H E H D S A C Tmentioning

confidence: 99%

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Catalytic Activities of Platinum Supported on Silica-modified Alumina for Hydrodesulfurization of Thiophene

Kanda

Ooka

Kobayashi

et al. 2007

J. Jpn. Petrol. Inst.

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Hydrodesulfurization (HDS) of thiophene over silica-modified alumina-supported platinum (Pt/SiO2 _ Al2O3) catalysts was examined. The HDS activity of a Pt/Al2O3 catalyst was enhanced by silica modification. However, the optimal silica loading for HDS activity could not be identifi ed. The dispersion of platinum on alumina, as measured by the hydrogen adsorption method, was enhanced by silica modifi cation and the optimal silica loading for platinum dispersion was 10 to 40 wt%. The acidity of SiO2 _ Al2O3 was evaluated by 2-propanol dehydration (200 C) and cumene cracking (400 C). The optimal silica loading for the acidity of SiO2 _ Al2O3 was 90 wt%. Furthermore, the presence of Brönsted acid sites on SiO2 _ Al2O3 was confi rmed by a pyridine adsorption method with FT-IR spectroscopy. The high HDS activity of the Pt/SiO2 _ Al2O3 catalyst is caused by both high Pt dispersion and formation of Brönsted acid sites.

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Section: Introductionmentioning

confidence: 85%

Section: The Opt I M a L S I O2 L O A D I N G F O R T H E H D S A C Tmentioning

confidence: 98%

Section: The Opt I M a L S I O2 L O A D I N G F O R T H E H D S A C Tmentioning

confidence: 99%

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Catalytic Activities of Platinum Supported on Silica-modified Alumina for Hydrodesulfurization of Thiophene

Kanda

Ooka

Kobayashi

et al. 2007

J. Jpn. Petrol. Inst.

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“…8.0) for the thiophene HDS. Furthermore, we showed in our previous paper that TOF of Pt/Al 2 O 3 -modified SiO 2 (Pt/Al 2 O 3 -SiO 2 ) catalyst (10.4) with high Pt dispersion (0.76) was higher than that of Pt/ Al 2 O 3 catalyst (5.0) with the similar Pt dispersion (0.82) [22]. We concluded that high TOF of Pt/Al 2 O 3 -SiO 2 was caused by Brønsted acid sites, which act as one of active sites for the HDS reaction.…”

Section: Hydrodesulfurization Of Thiophene Over C-r Pt/al-pilm Catalystmentioning

confidence: 95%

Preparation of Highly Active Alumina-Pillared Clay Montmorillonite-Supported Platinum Catalyst for Hydrodesulfurization

et al. 2009

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Effect of Pt precursor and pretreatment on hydrodesulfurization (HDS) activity of Pt/Al-PILM catalyst was examined to prepare highly active Pt-supported HDS catalyst. The order of HDS activities of Pt/aluminapillared clay montmorillonite (Al-PILM) catalysts prepared by various Pt precursors was Pt (C 5 6 . This order was in accordance with that of Pt dispersion. Thus, high Pt dispersion is essential factor to prepare highly active Pt/Al-PILM catalyst for HDS reaction. On the other hand, the effect of pretreatment on the HDS activities of Pt/Al-PILM catalysts prepared by various Pt precursors was also evaluated. The UC-TPS Pt/Al-PILM catalyst showed the highest HDS activity among various pretreated Pt/Al-PILM catalysts, in which uncalcined catalyst was sulfided by temperature programmed sulfidation (TPS). We assumed that high HDS activity of UC-TPS Pt/Al-PILM catalyst is caused by partly sulfided Pt particle with high dispersion. It is concluded that the highly active Pt/Al-PILM catalyst for the HDS reaction could be prepared by using Pt(C 5 H 7 O 2 ) 2 as a precursor and UC-TPS treatment.

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“…9. Therefore, both the Pt parti cles and acid sites of the Pt/MCM-41 catalyst also act as active sites in the HDS of BT as well as HDS of TP over highly active Pt/HZSM-5 30), 31) , Pt/Al2O3 _ modified SiO2 (Al2O3 SiO2) 34) , Pt/Al2O3 modified MCM-41 (Al2O3 _ MCM-41) 18), 19) and Pt/AlSBA-15 20),21) catalysts as shown in Fig. 12.…”

Section: 2 Interaction Between Support and Btmentioning

confidence: 99%

Catalytic Performance of Noble Metals Supported on Mesoporous Silica MCM-41 for Hydrodesulfurization of Benzothiophene

Kanda

Seino

Kobayashi

et al. 2009

J. Jpn. Petrol. Inst.

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The catalytic performances of noble metals (Pt, Rh, Pd, Ru) supported on mesoporous silica MCM-41 were investigated for the hydrodesulfurization (HDS) of benzothiophene (BT). The order of HDS activities of noble metal/MCM-41 catalysts was Pt＞Rh＞Pd≫Ru. Pt/MCM-41 catalyst showed high HDS activity, which was higher than that of commercial CoMo/Al2O3 catalyst. The supported noble metal catalysts were characterized by TEM, XRD, hydrogen adsorption and benzene hydrogenation. The order of dispersion of noble metal on MCM-41 was Rh＞Pt＞Pd＞Ru, which was not the same as that of HDS activities. On the other hand, the order of the activities of noble metal/MCM-41 catalysts for benzene hydrogenation was Pt＞Rh＞Pd＞Ru. The hydrogenation activity of Pt/MCM-41 catalyst was regenerated after H2S treatment, but the activities of other cat alysts were not regenerated. Thus, high hydrogenation activity and sulfur tolerance are important factors to pre pare highly active noble metal/MCM-41 catalysts. Pt/MCM-41 catalyst showed remarkably high and stable ac tivity for the HDS of BT, but Pt/SiO2 catalyst, with similar Pt dispersion on MCM-41, showed low activity which decreased with time on stream. Since MCM-41 showed higher acidity than SiO2, hydrogenation activity and sul fur tolerance of Pt/MCM-41 catalyst were higher than those of Pt/SiO2 catalyst. The results of FT-IR analysis indicated that the strength of interaction between BT and MCM-41 was stronger than that of SiO2, suggesting that both acid sites of MCM-41 and Pt particles in the Pt/MCM-41 catalyst act as active sites for the HDS of BT. Furthermore, FT-IR spectra of BT adsorbed on Pt/MCM-41 revealed that BT interacts with the silanol group on the MCM-41 surface rather than the Pt surface. Therefore, we concluded that the high HDS activity of Pt/ MCM-41 catalyst could be attributed to the high hydrogenation activity of Pt and the acidity of the support.

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Catalytic Performance of Noble Metals Supported on Alumina-modified Silica Gel for Hydrodesulfurization Reaction

Cited by 8 publications

References 20 publications

Catalytic Activities of Platinum Supported on Silica-modified Alumina for Hydrodesulfurization of Thiophene

Catalytic Activities of Platinum Supported on Silica-modified Alumina for Hydrodesulfurization of Thiophene

Preparation of Highly Active Alumina-Pillared Clay Montmorillonite-Supported Platinum Catalyst for Hydrodesulfurization

Catalytic Performance of Noble Metals Supported on Mesoporous Silica MCM-41 for Hydrodesulfurization of Benzothiophene

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