tert -Butylation of toluene with tert -butyl alcohol over immobilized titanium species on the Al-MCM-48

Zhou, Zhiwei; Mao, Wei; Qin, Juan; Han, Tianpeng; Han, Chaofan; Wu, Wenliang

doi:10.1016/j.molcata.2015.07.001

Cited by 6 publications

(2 citation statements)

References 31 publications

(30 reference statements)

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“…Owing to higher dispersion of TiO 4 , the TiO 2 /MCM-41 showed higher catalytic activity than amorphous SiO 2 under similar TiO 2 loadings. TiO 2 catalysts supported on other mesoporous silica materials like Al-MCM-48 92 and hydrophobic SBA-15 93 were also prepared using a wet-impregnation method that showed good catalytic performance in acid-catalyzed reactions even in the presence of water, which was attributed to the presence of isolated tetrahedral TiO 4 species.…”

Section: Synthesis Of Tio 2 -Based Catalystsmentioning

confidence: 99%

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

Sudarsanam

Sagar

2020

ACS Catal.

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Solid acid catalysts alone or in combination with redox metals play a pivotal role in biomass valorization to obtain alternative fuels and chemicals. In acid-catalyzed biomass conversions, water is a key reagent/byproduct that can induce leaching/poisoning of catalyst’s acid species, a major problem toward catalyst recyclability and product purification. Thus, developing efficient water-tolerant solid acid catalysts is vital for viable biomass valorization. TiO2 is considered to be a promising water-tolerant solid acid catalyst for biomass conversions because of the presence of coordinatively unsaturated Ti4+ sites, which are robust and less prone to leaching in the aqueous medium. Besides, the synergistic combination of TiO2 with redox metals (Ru, Pd, Ni, Cu, etc.) provides abundant bifunctional acid-redox sites, which exhibit a favorable catalytic role in the deoxygenation of biomass molecules to practically useful hydrocarbons. Therefore, this review provides an overview of recent progress toward TiO2-based water-tolerant acid catalysis for biomass conversion, with a focus on hydrothermal stability of TiO2, its acidity, and catalysts’ synthesis methods. Various biomass conversions over TiO2-based catalysts, where water-tolerant acid sites or acid-redox dual sites show a significant catalytic effect, were discussed. Structure–activity relationships based on water-tolerant Lewis acidity of TiO2 were emphasized. We believe that this review will provide valuable information for developing efficient water-tolerant solid acid catalysts not only for biomass valorization but also for other challenging reactions in the aqueous medium.

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Section: Synthesis Of Tio 2 -Based Catalystsmentioning

confidence: 99%

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

Sudarsanam

Sagar

2020

ACS Catal.

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“…The toluene conversion and the yield and selectivity of PTBT decreased with increasing the Si/Al ratios of Al-MCM-41 catalysts from 21 to 104 [16]. Zhou et al found the 4% Ti-Al-M48 catalyst showed the best toluene conversion (44%) and PTBT selectivity (78%) [17]. Though zeolite catalysts possess high catalytic activity for PTBT production, the main drawback is their coke deposition after a certain period, which further limits molecular diffusion and accessibility to acid sites and thereby prevents the catalysis.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency toluene alkylation with tert-butyl alcohol catalyzed by Ce2O3-modified H-beta zeolites

et al. 2018

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A series of xCe 2 O 3 /H-beta catalysts with different Ce 2 O 3 loadings were prepared and the catalytic performances were investigated through toluene butylation as the probe reaction. The xCe 2 O 3 /H-beta catalysts showed high para-selectivity due to their improved structural and acidic properties, which were confirmed by XRD, SEM, ICP-OES, BET, Py-IR and TG. Compared with the parent H-beta zeolite, the xCe 2 O 3 /H-beta catalysts showed slightly lower toluene conversion and significantly higher para-tert-butyl toluene (PTBT) selectivity. Loading of Ce 2 O 3 firstly narrowed the pore size of H-beta zeolite, which benefited the shape-selectivity, and secondly increased the PTBT selectivity by suppressing the isomerization on acid sites of outer surface of the catalysts. Under comparable conditions, the 5%Ce 2 O 3 /H-beta exhibited the maximum PTBT selectivity (82.7%) at 180 °C after 4 h. The optimum reaction conditions over xCe 2 O 3 /H-beta zeolites were molar ratio of tert-butyl alcohol to toluene = 3:1, reaction temperature = 180 °C, and reaction time = 4 h.

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Efficient recovery of ultrafine catalysts from oil/water/solid three-phase system by ceramic microfiltration membrane

Zou

Jiang

Gao

et al. 2016

Korean J. Chem. Eng.

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tert -Butylation of toluene with tert -butyl alcohol over immobilized titanium species on the Al-MCM-48

Cited by 6 publications

References 31 publications

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

High-efficiency toluene alkylation with tert-butyl alcohol catalyzed by Ce2O3-modified H-beta zeolites

Efficient recovery of ultrafine catalysts from oil/water/solid three-phase system by ceramic microfiltration membrane

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tert -Butylation of toluene with tert -butyl alcohol over immobilized titanium species on the Al-MCM-48

Cited by 6 publications

References 31 publications

TiO2-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

TiO2-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

High-efficiency toluene alkylation with tert-butyl alcohol catalyzed by Ce2O3-modified H-beta zeolites

Efficient recovery of ultrafine catalysts from oil/water/solid three-phase system by ceramic microfiltration membrane

Contact Info

Product

Resources

About

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals

TiO₂-Based Water-Tolerant Acid Catalysis for Biomass-Based Fuels and Chemicals