Hierarchical Porous K-OMS-2/3DOM-m Ti0.7Si0.3O2 Catalysts for Soot Combustion: Easy Preparation, High Catalytic Activity, and Good Resistance to H2O and SO2

ACS Catalysis ◽  
2021 ◽  
pp. 5554-5571
Author(s):  
Xuehua Yu ◽  
Yu Ren ◽  
Di Yu ◽  
Maozhong Chen ◽  
Lanyi Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Soot Combustion ◽  
Good Resistance ◽  
Hierarchical Porous

Facile preparation of a hierarchically porous metal–organic nanocomposite with excellent catalytic performance

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 97399-97403 ◽  
Author(s):  
Rui Kuang ◽  
Luyi Zheng ◽  
Ethan Cottrill ◽  
Ning Pan ◽  
Yanhui Chi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aging Process ◽  
Porous Metal ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Hierarchically Porous ◽  
Hierarchical Porous ◽  
Metal Organic ◽  
Facile Preparation ◽  
Excellent Catalytic Performance

A hierarchical porous MOF nanocrystal, hpCuL (L = 2,4,6-tris(3,5-dicarboxylatephenylamino)-1,3,5-triazine) was prepared via a facile gel-aging process. This nanocomposite exhibits high catalytic activity and stability for the reduction of 4-nitrophenol.

High catalytic activity of SCS-synthesized ceria towards diesel soot combustion

2006 ◽  
Vol 69 (1-2) ◽  
pp. 85-92 ◽  
Author(s):  
Pietro Palmisano ◽  
Nunzio Russo ◽  
Paolo Fino ◽  
Debora Fino ◽  
Claudio Badini
Keyword(s):  
Catalytic Activity ◽  
Diesel Soot ◽  
High Catalytic Activity ◽  
Soot Combustion

Hierarchical porous N-doped carbon supported palladium (Pd/NHPC) as a sustainable catalyst for the reduction of 4-nitrophenol with good activity and lifetime

2017 ◽  
Vol 41 (18) ◽  
pp. 10245-10250 ◽  
Author(s):  
X. X. Wu ◽  
H. Zhou
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Good Activity ◽  
Hierarchical Porous ◽  
Supported Palladium

Pd/NHPC synthesized through a facile method exhibited high catalytic activity and reusability toward the reduction of 4-NP.

scholarly journals Structure-Catalytic Properties Relationship in Friedel Crafts Alkylation Reaction for MCM-36-Type Zeolites Obtained by Isopropanol-Assisted Pillaring

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 299
Author(s):  
Karolina Ogorzały ◽  
Agnieszka Węgrzyn ◽  
Aleksandra Korzeniowska ◽  
Andrzej Sławek ◽  
Andrzej Kowalczyk ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Acid Sites ◽  
Alkylation Reaction ◽  
High Catalytic Activity ◽  
Large Molecules ◽  
External Acid Sites ◽  
Hierarchical Porous ◽  
Acid Centers ◽  
Ir Study

MWW type zeolites are characterized by the presence of zeolitic layers of 2.5 nm thickness, containing 10-member ring sinusoidal channels inside and supercavities with 12-member ring openings located on their surfaces. Expansion and pillaring of layered zeolites increase the access to active sites and can enable or facilitate catalytic activity towards larger reactant molecules. This goal is explored in this work reporting the pillaring of layered zeolite MCM-56 with MWW topology by tetraethylorthosilicate (TEOS) treatment with the assistance of isopropanol, aimed at obtaining hierarchical micro-mesoporous systems. MCM-56 (Si/Al = 12) was synthesized with hexamethyleneimine as a structure-directing and aniline as a structure-promoting agent. Hierarchical porous systems were obtained using two different pillaring methods: (1) with TEOS only and (2) with TEOS mixed with isopropanol. The MWW framework was preserved during swelling/pillaring in both methods. Pillared zeolites obtained via alcohol-assisted pillaring possessed unique intermediate micro-mesopores with the size of about 2 nm. IR study revealed a decrease in the concentration of accessible acid centers upon pillaring. However, the fraction of acid sites on the external surface, accessible for adsorption of large molecules, increased by up to 90%. Catalytic activity was evaluated in the Friedel-Crafts alkylation of mesitylene with benzyl alcohol. Pillaring resulted in reduction of the acid site concentrations, but the materials retained high catalytic activity. Pillaring in the presence of alcohol produced increased turnover frequency values based on the concentrations of the external acid sites.

Hierarchical porous ZIF-8 for hydrogen production via the hydrolysis of sodium borohydride

2020 ◽  
Vol 49 (14) ◽  
pp. 4416-4424 ◽  
Author(s):  
Hani Nasser Abdelhamid
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Sodium Borohydride ◽  
Terephthalic Acid ◽  
High Catalytic Activity ◽  
Zeolitic Imidazolate Framework ◽  
Hierarchical Porous ◽  
Hydrolysis Of

Terephthalic acid (TPA) is used for the synthesis of hierarchical porous zeolitic imidazolate framework (HPZIF-8) which shows high catalytic activity for the hydrolysis of NaBH4 (2333 mLH2 min−1 gcat−1).

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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