ZnPd/ZnO Aerogels as Potential Catalytic Materials

2015 ◽  
Vol 26 (7) ◽  
pp. 1014-1020 ◽  
Author(s):  
Christoph Ziegler ◽  
Stefan Klosz ◽  
Lars Borchardt ◽  
Martin Oschatz ◽  
Stefan Kaskel ◽  
...  
Keyword(s):  
Catalytic Materials ◽  
Zno Aerogels

Efficient Production of Biodiesel Catalyzed by Acidic Nanoporous Carbon Materials：A Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Anping Wang ◽  
Heng Zhang ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Pore Structure ◽  
Active Sites ◽  
Catalytic Performance ◽  
Nanoporous Carbon ◽  
Biodiesel Production ◽  
Efficient Production ◽  
Fossil Energy ◽  
Catalytic Materials ◽  
High Acid ◽  
Carbon Based

Background: With the gradual decrease of fossil energy, the development of alternatives to fossil energy has attracted more and more attention. Biodiesel is considered to be the most potent alternative to fossil energy, mainly due to its green, renewable and biodegradable advantages. The stable, efficient and reusable catalysts are undoubtedly the most critical in the preparation of biodiesel. Among them, nanoporous carbon-based acidic materials are very important biodiesel catalysts. Objective: The latest advances of acidic nanoporous carbon catalysts in biodiesel production was reviewed. Methods: Biodiesel is mainly synthesized by esterification and transesterification. Due to the important role of nanoporous carbon-based acidic materials in the catalytic preparation of biodiesel, we focused on the synthesis, physical and chemical properties, catalytic performance and reusability. Results: Acidic catalytic materials have a good catalytic performance for high acid value feedstocks. However, the preparation of biodiesel with acid catalyst requires relatively strict reaction conditions. The application of nanoporous acidic carbon-based materials, due to the support of carbon-based framework, makes the catalyst have good stability and unique pore structure, accelerates the reaction mass transfer speed and accelerates the reaction. Conclusion: Nanoporous carbon-based acidic catalysts have the advantages of suitable pore structure, high active sites, and high stability. In order to make these catalytic processes more efficient, environmentally friendly and low cost, it is an important research direction for the future biodiesel catalysts to develop new catalytic materials with high specific surface area, suitable pore size, high acid density, and excellent performance.

Co3O4-CuCoO2 hybrid nanoplates as a low-cost and highly active catalyst for producing hydrogen from ammonia borane

2021 ◽  
Author(s):  
Yufa Feng ◽  
Jinyun Liao ◽  
Xiaodong Chen ◽  
Qingyu Liao ◽  
Huize Wang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Active Catalyst ◽  
Low Cost ◽  
Ammonia Borane ◽  
Catalytic Materials ◽  
Highly Active ◽  
Promising Strategy

Developing low-cost and highly active hydrolysis catalytic materials for the dehydrogenation of hydrogen-rich chemicals is a promising strategy to store and easily release hydrogen for fuel cell applications. In this...

Engineering Sn‐based Catalytic Materials for Efficient Electrochemical CO 2 Reduction to Formate

ChemNanoMat ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 380-391
Author(s):  
Ying Fan Tay ◽  
Zheng Hao Tan ◽  
Yanwei Lum
Keyword(s):  
Catalytic Materials

Spectroscopic characterization of Ni/Al2O3 catalytic materials for the steam reforming of renewables

2013 ◽  
Vol 452 ◽  
pp. 163-173 ◽  
Author(s):  
Gabriella Garbarino ◽  
Serena Campodonico ◽  
Alvaro Romero Perez ◽  
Maria M. Carnasciali ◽  
Paola Riani ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Spectroscopic Characterization ◽  
Catalytic Materials

scholarly journals Effect of cerium on structural and optical properties of ZnO aerogel synthesized in supercritical methanol

2016 ◽  
Vol 34 (3) ◽  
pp. 659-664 ◽  
Author(s):  
M. Meddouri ◽  
L. Hammiche ◽  
O. Slimi ◽  
D. Djouadi ◽  
A. Chelouche
Keyword(s):  
Zinc Acetate ◽  
Structural Parameters ◽  
Fluorite Structure ◽  
Cubic Phase ◽  
Second Phase ◽  
Acetate Solution ◽  
Supercritical Methanol ◽  
Doped Zno ◽  
Zno Aerogels ◽  
Zno Aerogel

AbstractPure ZnO and Ce-doped (5 at.%) ZnO aerogels were prepared by dissociation of dihydrate zinc acetate and cerium nitrate in methanol, followed by drying in supercritical conditions of the solvent. The concentration of zinc acetate solution and the atomic ratio Ce/Zn were fixed at 0.2 mol/L and 0.05 mol/L, respectively. XRD results showed a hexagonal wurtzite structure of ZnO aerogel crystallites and a formation of a separate second phase of ceria cubic phase with fluorite structure and 7.4 nm in size. The introduction of cerium in the solution had a negative effect on the aerogel crystalline quality. The crystallites size was found to be 16 nm in pure ZnO and 27 nm in Ce-doped ZnO aerogels. The grains of Ce-doped ZnO aerogel had torus shaped morphology with hollow centers, but those of pure ZnO were flattened semispheres. The calculated values of different structural parameters showed that cerium ions introduced into the ZnO lattice occupied interstitial sites and Zn ions substituted Ce ones in ceria lattice during the formation process. FT-IR and UV-Vis absorption spectra have not revealed any particularities due to the presence of cerium atoms in ZnO, indicating that Ce (5 at.%) doping of ZnO crystallites synthesized in supercritical methanol did not strongly affect the optical gap of the semiconductor. Micro-Raman studies confirmed the formation of cubic fluorite structure ceria in ZnO aerogel and showed that Raman active modes of ZnO are amplified with the presence of ceria.

Layered Double Hydroxides as Catalytic Materials: Recent Development

2008 ◽  
Vol 12 (4) ◽  
pp. 253-265 ◽  
Author(s):  
Fazhi Zhang ◽  
Xu Xiang ◽  
Feng Li ◽  
Xue Duan
Keyword(s):  
Layered Double Hydroxides ◽  
Catalytic Materials ◽  
Double Hydroxides
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