Influence of Pd ion-exchange temperature on the catalytic performance of Cu–ZnO/Pd–β zeolite hybrid catalyst for CO hydrogenation to light hydrocarbons

2008 ◽  
Vol 9 (8) ◽  
pp. 1775-1778 ◽  
Author(s):  
Qingjie Ge ◽  
Teppei Tomonobu ◽  
Kaoru Fujimoto ◽  
Xiaohong Li
Keyword(s):  
Ion Exchange ◽  
Co Hydrogenation ◽  
Catalytic Performance ◽  
Hybrid Catalyst ◽  
Light Hydrocarbons ◽  
Β Zeolite

Amino-functionalized Cu-MOF for efficient purification of methane from light hydrocarbons and excellent catalytic performance

2019 ◽  
Vol 6 (5) ◽  
pp. 1152-1157 ◽  
Author(s):  
Xia Wang ◽  
Xiurong Zhang ◽  
Kai Zhang ◽  
Xiaokang Wang ◽  
Yutong Wang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Light Hydrocarbons ◽  
Excellent Catalytic Performance

Amino-functionalized Cu-MOF for the efficient purification of methane from light hydrocarbons and excellent catalytic performance.

scholarly journals Dual Stimuli-Responsive Copper Nanoparticles Decorated SBA-15: A Highly Efficient Catalyst for the Oxidation of Alcohols in Water

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2051
Author(s):  
Anju Maria Thomas ◽  
Jerome Peter ◽  
Saravanan Nagappan ◽  
Anandhu Mohan ◽  
Chang-Sik Ha
Keyword(s):  
Mesoporous Silica ◽  
Copper Nanoparticles ◽  
Catalytic Performance ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Hybrid Catalyst ◽  
Ph Responsive ◽  
Efficient Catalyst ◽  
13C Nuclear Magnetic Resonance ◽  
Alcohol Conversion

In the present work, a temperature and pH-responsive hybrid catalytic system using copolymer-capped mesoporous silica particles with metal nanoparticles is proposed. The poly(2-(dimethylamino)ethyl methacrylate)(DMAEMA)-co-N-tert-butyl acrylamide) (TBA)) shell on mesoporous silica SBA-15 was obtained through free radical polymerization. Then, copper nanoparticles (CuNPs) decorated SBA-15/copolymer hybrid materials were synthesized using the NaBH4 reduction method. SBA-15 was functionalized with trimethoxylsilylpropyl methacrylate (TMSPM) and named TSBA. It was found that the CuNPs were uniformly dispersed in the mesoporous channels of SBA-15, and the hybrid catalyst exhibited excellent catalytic performance for the selective oxidation of different substituted benzyl alcohols in water using H2O2 as an oxidant at room temperature. The dual (temperature and pH-) responsive behaviors of the CuNPs/p(DMAEMA-co-TBA)/TSBA catalyst were investigated using the dynamic light scattering technique. The conversion of catalytic products and selectivity were calculated using gas chromatographic techniques, whereas the molecular structure of the products was identified using 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. The catalyst showed excellent catalytic activity toward the oxidation of alcohol to aldehyde in an aqueous medium below the lower critical solution temperature (LCST) and pKa values (7–7.5) of the copolymer. The main advantages of the hybrid catalyst, as compared to the existing catalysts, are outstanding alcohol conversion (up to 99%) for a short reaction time (1 h), small amount of the catalyst (5 mg), and good recyclability equal to at least five times.

Solventless synthesis of solketal with commercially available sulfonic acid based ion exchange resins and their catalytic performance

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Jesús Esteban ◽  
Félix García-Ochoa ◽  
Miguel Ladero
Keyword(s):  
Ion Exchange ◽  
Sulfonic Acid ◽  
Catalytic Performance ◽  
Maximum Activity ◽  
Ion Exchange Resins ◽  
Active Centers ◽  
Ease Of Access ◽  
Exchange Resins ◽  
Solventless Synthesis

AbstractAs a means to valorize glycerol, the synthesis of solketal through a ketalization reaction with acetone was performed. Mild solventless conditions were applied to test the activity of different commercially available sulfonic ion exchange resins that had already been used for other applications, namely: Amberlyst 35dry, Amberlyst 36dry, Purolite CT275DR, Purolite CT276 and Lewatit GF101. Thorough characterization of the resins is herein provided and discussed, including acidity, elemental analysis, thermogravimetric, 13C-NMR, surface area and pore size distribution measurements. Lewatit GF101 showed the best performance reaching a yield to solketal of 47% after 6 h of operation at 313 K using a molar excess of acetone to glycerol of 4.5 to 1, owing to a greater availability of active centers as well as the ease of access to them than in the rest of the resins. Additionally, reutilization with and without regeneration was performed in up to five cycles, showing that Purolite CT276 had the lowest relative drop of its maximum activity, despite being the least active in each of the cycles.

Catalytic performance and characterization of RhVO4/SiO2 for hydroformylation and CO hydrogenation

2006 ◽  
Vol 244 (1-2) ◽  
pp. 201-212 ◽  
Author(s):  
Takashi Yamagishi ◽  
Ippei Furikado ◽  
Shin-ichi Ito ◽  
Toshihiro Miyao ◽  
Shuichi Naito ◽  
...  
Keyword(s):  
Co Hydrogenation ◽  
Catalytic Performance

scholarly journals CuZnZr-Zeolite Hybrid Grains for DME Synthesis: New Evidence on the Role of Metal-Acidic Features on the Methanol Conversion Step

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 671
Author(s):  
Massimo Migliori ◽  
Antonio Condello ◽  
Francesco Dalena ◽  
Enrico Catizzone ◽  
Girolamo Giordano
Keyword(s):  
Acid Catalyst ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Hybrid Catalyst ◽  
Zeolite Structure ◽  
Precipitation Medium ◽  
Co Precipitation ◽  
New Evidence

The assessment of the catalytic performance of “hybrid” metal/zeolite catalysts (based on FER or MFI structure and CuZnZr metal complexes) in the methanol dehydration step to DME has been studied in this work. The results clearly show that there is an important effect of the interaction between metal and acid sites affecting the acid catalyst performances. Additionally, deactivation, studied by means of a Timo-on-Stream (TOS) test, was affected by the type of zeolite structure used for hybrid catalyst preparation. The decrease in DME selectivity can be attributed to the cooperation of metal and acid sites in the production of different compounds (mainly methyl formate and dimethoxy methane) converting methanol and DME. The presence of these compounds (indicating different reaction pathways active) was found to be dependent on the zeolite structure and on the type of co-precipitation medium (water or ethanol) used to prepare the hybrid catalyst.

Effect of In2O3 on the structural properties and catalytic performance of the CuO/ZnO/Al2O3 catalyst in CO2 and CO hydrogenation to methanol

2020 ◽  
Vol 484 ◽  
pp. 110776 ◽  
Author(s):  
Mohammad Sadeghinia ◽  
Mehran Rezaei ◽  
Ali Nemati Kharat ◽  
Majid Namayandeh Jorabchi ◽  
Behzad Nematollahi ◽  
...  
Keyword(s):  
Structural Properties ◽  
Co Hydrogenation ◽  
Catalytic Performance ◽  
Al2o3 Catalyst
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