One-pot synthesis of perovskite-type metal oxides via confined mesopore and their catalytic activity for toluene oxidation

Suh, Myung-Ji; Park, Young-Kwon; Ihm, Son‐Ki

doi:10.1016/j.cattod.2015.08.057

Cited by 12 publications

(8 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of more Co 4+ ions increases the oxygen vacancies of oxide materials and surface oxygen vacancies is beneficial to the adsorption, activation and mobility of oxygen 36 , which will accelerate the formation of more adsorbed oxygen species. In addition, surface active oxygen species promote the enhancement in catalytic performance for low temperature oxidation 4,39 .…”

Section: Characterizations Of Mesoporous Lsc-x Perovskitementioning

confidence: 99%

“…Perovskite complex oxides (ABO 3 ) were found to be the most promising alternative to noble metal catalysts in a variety of catalytic processes due to their higher thermal stability and outstanding physicochemical properties 4 . Especially, La-Co-O perovskite oxides appear to be the most active among the LaBO 3 (B is transition atom from V to Ni) perovskite series for the CO complete oxidation 6,7 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, the substitution of La 3+ ions by Sr 2+ ions in perovskite oxides can either increase the valence state of the B site ion or generate oxygen vacancies, leading to the improvement of oxidizing ability of catalysts 7,8 . Unfortunately, as a catalyst, the application of perovskite oxides obtained by traditional methods is limited owing to its low surface area and catalytic activity 4,5 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La0.8Sr0.2CoO3

Huang¹,

Shang²,

Niu³

2017

Acta Physico-Chimica Sinica

View full text Add to dashboard Cite

摘要：本文通过改进的水热法制备了孔径较大的有序介孔 SBA-15，其孔径(Dp)为 10.1 nm，并采用浓盐酸、三甲基氯硅烷(TMCS)和 3-氨丙基三乙氧基硅烷(APTES)对 SBA-15 表面进行了羟基、甲基和氨基改性处理。以嫁接不同表面官能团的 SBA-15 为模板，合成了一系列菱方晶系钙钛矿型介孔 La0.8Sr0.2CoO3 氧化物，系统地研究了模板 SBA-15 的表面性能对 La0.8Sr0.2CoO3 氧化物结构和性能的影响。X 射线衍射(XRD)图谱表明，外表面引入-CH3，内表面羟基化和引入-NH2 的模板有利于合成结晶度较高的、物相单一的钙钛矿结构氧化物。小角 XRD 图谱、高分辨率透射电子显微镜(HRTEM)图像以及 N2 吸附测试结果表明，所制备的催化剂为介孔结构。CO 氧化的催化活性测试表明，采用表面改性的模板合成的 La0.8Sr0.2CoO3 氧化物表现出较高的催化活性和稳定性，在 140 °C 时可以实现 CO 的完全转化，连续使用 100 h 后催化剂的催化活性几乎没有下降。X 射线光电子能谱(XPS)、H2 程序升温还原(H2-TPR)和 O2 程序升温脱附(O2-TPD)测试结果表明，催化剂表面丰富的吸附氧物种，高价态的 Co 离子，钙钛矿结构中 Sr 在表面富集，及优良的低温氧化还原性是催化活性提高的主要原因。关键词：SBA-15；表面改性；模板法；介孔 La0.8Sr0.2CoO3；低温 CO 氧化中图分类号：O643；TQ138.1+2

show abstract

Section: Characterizations Of Mesoporous Lsc-x Perovskitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La0.8Sr0.2CoO3

Huang¹,

Shang²,

Niu³

2017

Acta Physico-Chimica Sinica

View full text Add to dashboard Cite

show abstract

“…Zhang et al also revealed the complete thermocatalytic mineralization of gaseous toluene on LaMnO 3 [8]. Nevertheless, much high energy (temperature > 200 o C) is needed to achieve complete removal of VOCs for the reported perovskites [9,10]. In fact, by combining the thermocatalysis with photocatalysis, much lower temperature with even higher activity were observed for a series of metal oxides such as CeO 2 [11], TiO 2 [12,13], MnO x [14] and their composites [15,16] toward VOC degradation.…”

Section: Introductionmentioning

confidence: 99%

Visible-light-enhanced photothermocatalytic activity of ABO3-type perovskites for the decontamination of gaseous styrene

Chen

Zhao

et al. 2017

Applied Catalysis B: Environmental

122

View full text Add to dashboard Cite

ABO 3-type perovskites (A=La, Ce, Sm; B=Cr, Mn, Fe, Co, Ni) were systematically fabricated via a facile soft-templated sol-gel with post-calcination method through a complexation-carbonation-oxidation process, which were successfully applied in the visible-light-driven photothermocatalytic degradation of volatile organic compounds (VOCs) for the first time. Preliminary characterization results revealed the lower impact to the oxidative performance and visible-light-absorption properties of ANiO 3 than LaBO 3 , while the latter ones should present more attractive promotion of catalytic performance toward VOC degradation. Subsequently catalytic degradation of VOCs using gaseous styrene as model compound confirmed that all LaBO 3-type perovskites possessed both high visible-light-driven photocatalytic and temperature-induced thermocatalytic activities. Meanwhile, synergetic effect between photocatalysis and thermocatalysis activities of different position B substituted LaBO 3 resulted in different enhancement of their photothermocatalytic activities, where the highest synergistic factor (3.53) was obtained for LaMnO 3 at 140 o C. Besides, the synergetic effect could also effectively preserve the activity of the perovskite catalysts (eg. LaMnO 3) that almost the same removal efficiency (ca. 96.6% within 40 min) was obtained to styrene (initial concentration of 40 ppmv) after five continuous cycling tests. The highly and stably photothermocatalytic activity of these perovskites were attributed to the coefficient effect of the small crystal size and narrower bandgap as well as high visible light absorption and reducibility. This work could provide an efficient and practical way to utilize the total energy of sun for the remediation of atmospheric environment pollutions.

show abstract

“…Al-SBA-15 and Meso Y which have similar Si/Al ratio (Si/Al = 20 and 15) were prepared using the synthesis methods reported elsewhere. [28][29][30][31] The N 2 sorption and temperature programmed desorption of NH 3 (NH 3 -TPD) were performed to examine the physical properties and the acidity of each catalyst, respectively, following previously reported procedures. 15 32 33 Table I shows the results of physical properties of mesoporous catalysts including Brunauer-Emmett-Teller (BET) surface area and pore diameter.…”

Section: Synthesis and Characterization Of Catalystmentioning

confidence: 99%

Catalytic Pyrolysis of Citrus unshiu Peel Over Mesoporous Catalysts

Lee¹,

Lee²,

Sun³

et al. 2017

sci adv mater

Self Cite

View full text Add to dashboard Cite

The ex-situ catalytic pyrolysis of Citrus unshiu peel was performed over mesoporous catalysts, Al-SBA-15 and Mesoporous Y, which have different acidity and structures. The Brunauer-Emmett-Teller surface area, pore diameter, and temperature programmed desorption of NH 3 were measured to analyze the characteristics of the catalysts. A tandem micro reactor-GC/MS system was used for catalytic pyrolysis and product analysis. By applying catalytic pyrolysis, a large number of oxygen-containing compounds were upgraded to furans and aromatics with the formation of byproducts, such as light olefins, CO and CO 2. Mesoporous Y exhibited better performance for aromatic hydrocarbon formation than Al-SBA-15 owing to its medium-strength acidity and structural properties.

show abstract

One-pot synthesis of perovskite-type metal oxides via confined mesopore and their catalytic activity for toluene oxidation

Cited by 12 publications

References 42 publications

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub>

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub>

Visible-light-enhanced photothermocatalytic activity of ABO3-type perovskites for the decontamination of gaseous styrene

Catalytic Pyrolysis of Citrus unshiu Peel Over Mesoporous Catalysts

Contact Info

Product

Resources

About