scholarly journals Ru Nanoparticles Embedded in Cubic Mesoporous Silica SBA-1 as Highly Efficient Catalysts for Hydrogen Generation from Ammonia Borane

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 267 ◽  
Author(s):  
Juti Rani Deka ◽  
Diganta Saikia ◽  
Kuo-Shu Hsia ◽  
Hsien-Ming Kao ◽  
Yung-Chin Yang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Active Sites ◽  
Hydrogen Generation ◽  
Ammonia Borane ◽  
High Dispersion ◽  
High Catalytic Activity ◽  
Porous Support ◽  
H2 Generation ◽  
Ru Nanoparticles ◽  
Cubic Mesoporous

Cubic mesoporous silica SBA-1 functionalized with carboxylic acid (-COOH), namely S1B-C10, is used as a support to fabricate and confine Ru nanoparticles (NPs). The uniformly dispersed organic functional groups in SBA-1 are beneficial in attracting Ru cations, and as a result, homogenously distributed small sized Ru NPs are formed within the mesopores. The prepared Ru@S1B-C10 is utilized as a catalyst for H2 generation from the hydrolysis of ammonia borane (AB). The Ru@S1B-C10 catalyst demonstrates high catalytic activity for H2 generation (202 mol H2 molRu min−1) and lower activation energy (24.13 kJ mol−1) due to the small sized Ru NPs with high dispersion and the support’s interconnected mesoporous structure. The nanosized Ru particles provide abundant active sites for the catalytic reaction to take place, while the interconnected porous support facilitates homogenous transference and easy dispersal of AB molecules to the active sites. The catalyst demonstrates good recycle ability since the accumulation and leaking of NPs throughout catalysis can be effectively prevented by the support.

scholarly journals New gold standard: weakly capped infant Au nanoclusters with record high catalytic activity for 4-nitrophenol reduction and hydrogen generation from an ammonia borane–sodium borohydride mixture

2020 ◽  
Vol 2 (11) ◽  
pp. 5384-5395
Author(s):  
Dinabandhu Patra ◽  
Srinivasa Rao Nalluri ◽  
Hui Ru Tan ◽  
Mohammad S. M. Saifullah ◽  
Ramakrishnan Ganesan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Citric Acid ◽  
Solid State ◽  
Gold Standard ◽  
Active Sites ◽  
Hydrogen Generation ◽  
High Catalytic Activity ◽  
Au Nanoclusters ◽  
Nitrophenol Reduction ◽  
Rapid Dissolution

Active sites are preserved in the citric acid-capped Au nanoclusters prepared in solid state. In water, the rapid dissolution of citric acid allows the reactants to easily access the active sites of infant Au nanoclusters leading to faster catalysis.

scholarly journals Preparation of an Active Ni2B/SBA-15 Catalyst to Improve NaBH4 Hydrolysis for Hydrogen Generation

2015 ◽  
Vol 18 (4) ◽  
pp. 231-235
Author(s):  
Fei Wu ◽  
Ting Li ◽  
Jindan Chen ◽  
Xiu Ru Yang ◽  
Cheng Ming Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Hydrogen Generation ◽  
Sintering Temperature ◽  
Weight Ratio ◽  
High Catalytic Activity

Ni2B nanoparticle distributed on ordered SBA-15 mesoporous silica was prepared in situ and its catalytic activity for NaBH4 hydrolysis was investigated in the presented paper. The problem of Ni2B aggregation is resolved and the catalytic activity of Ni2B is also improved due to the effect of SBA-15. The catalytic activity increases with Ni2B/SBA-15 weight ratio increased from 1:4 to 2:1 and the catalyst with Ni2B/SBA-15 weight ratio of 2:1 has high catalytic activity close to that of Ni2B. The sintered experiment shows that the catalytic activity comes from amorphous Ni2B, not crystalline Ni2B. High sintering temperature leads to the conversion from amorphous Ni2B to crystalline Ni2B and damages the nanostructure of amorphous Ni2B framework.

Identifying the electrocatalytic active sites of a Ru-based catalyst with high Faraday efficiency in CO2-saturated media for an aqueous Zn–CO2 system

2020 ◽  
Vol 8 (30) ◽  
pp. 14927-14934
Author(s):  
Jeongwon Kim ◽  
Yejin Yang ◽  
Arim Seong ◽  
Hyuk-Jun Noh ◽  
Changmin Kim ◽  
...  
Keyword(s):  
Active Sites ◽  
Hydrogen Generation ◽  
Ru Nanoparticles ◽  
System P ◽  
Saturated Media

For the aqueous Zn–CO2 system, strongly embedded Ru nanoparticles on the substrate reveal the improved hydrogen generation activities for indirect CO2 utilization.

Water-soluble Poly(4-styrenesulfonic acid-co-maleic acid)-stabilized Nickel(0) and Cobalt(0) Nanoclusters as Highly Active Catalysts in Hydrogen Generation from the Hydrolysis of Ammonia-Borane

2009 ◽  
Vol 1217 ◽  
Author(s):  
Önder Metin ◽  
Saim Özkar
Keyword(s):  
Maleic Acid ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Ammonia Borane ◽  
Water Soluble ◽  
High Catalytic Activity ◽  
Highly Active ◽  
First Time ◽  
Hydrolysis Of ◽  
Soluble Poly

AbstractWater soluble poly(4-styrenesulfonic acid-co-maleic acid), PSSA-co-MA, stabilized nickel(0) and cobalt(0) nanoclusters were prepared for the first time from the reduction of nickel(II) chloride and cobalt(II) chloride by using minimum amount of sodium borohydride shortly before their usage as catalysts in the hydrolysis of ammonia-borane (AB) in the same medium at room temperature. PSSA-co-MA stabilized nickel(0) and cobalt(0) nanoclusters showed high catalytic activity in hydrogen generation from the hydrolysis of AB even at low temperature.

Ru nanoparticles supported on MIL-53(Cr, Al) as efficient catalysts for hydrogen generation from hydrolysis of ammonia borane

2016 ◽  
Vol 41 (15) ◽  
pp. 6300-6309 ◽  
Author(s):  
Kunzhou Yang ◽  
Liqun Zhou ◽  
Guofeng Yu ◽  
Xing Xiong ◽  
Menglin Ye ◽  
...  
Keyword(s):  
Hydrogen Generation ◽  
Ammonia Borane ◽  
Ru Nanoparticles ◽  
Hydrolysis Of
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