scholarly journals Acid–base sites synergistic catalysis over Mg–Zr–Al mixed metal oxide toward synthesis of diethyl carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4695-4702 ◽  
Author(s):  
Tingting Yan ◽  
Weihan Bing ◽  
Ming Xu ◽  
Yinwen Li ◽  
Yusen Yang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Catalytic Performance ◽  
Transformation Process ◽  
Mixed Metal Oxide ◽  
Diethyl Carbonate ◽  
Mixed Metal Oxides ◽  
Acid Base ◽  
Phase Transformation Process ◽  
Mixed Metal ◽  
Synergistic Catalysis

Mg/Zr/Al mixed metal oxides were prepared via a facile phase transformation process of hydrotalcite precursors, which showed acid–base sites synergistic catalytic performance toward the synthesis of diethyl carbonate from ethanol and urea.

scholarly journals Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 354
Author(s):  
Khadijah H. Alharbi ◽  
Ali Alsalme ◽  
Ahmed Bader A. Aloumi ◽  
Mohammed Rafiq H. Siddiqui
Keyword(s):  
Metal Oxide ◽  
Calcination Temperature ◽  
Aging Time ◽  
Metal Oxide Nanoparticles ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Mixed Metal Oxide ◽  
Toluene Oxidation ◽  
Mixed Metal ◽  
Selective Catalytic Oxidation

Oxidation is an important organic transformation, and several catalysts have been reported for this conversion. In this study, we report the synthesis of mixed metal oxide CuxZnyO, which is prepared by a coprecipitation method by varying the molar ratio of Cu and Zn in the catalytic system. The prepared mixed metal oxide CuxZnyO was evaluated for catalytic performance for toluene oxidation. Various parameters of the catalytic evaluation were studied in order to ascertain the optimum condition for the best catalytic performance. The results indicate that aging time, calcination temperature, reaction temperature, and feed rate influence catalytic performance. It was found that the catalyst interfaces apparently enhanced catalytic activity for toluene oxidation. The XRD diffractograms reveal the crystalline nature of the mixed metal oxide formed and also confirm the coexistence of hexagonal and monoclinic crystalline phases. The catalyst prepared by aging for 4 h and calcined at 450 °C was found to be the best for the conversion of toluene to benzaldehyde while the reactor temperature was maintained at 250 °C with toluene fed into the reactor at 0.01 mL/min. The catalyst was active for about 13 h.

High efficient phosphate removal by lanthanum modified hydroxyapatite with a phase transformation process

2021 ◽  
Vol 216 ◽  
pp. 211-219
Author(s):  
Zhongjun Li ◽  
Qiwu Wei ◽  
Guisheng Zeng ◽  
Zhong Ren ◽  
Baojin Huang
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
Phosphate Removal ◽  
Phase Transformation Process ◽  
High Efficient

Removal and recovery of Pb from wastewater through a reversible phase transformation process between nano-flower-like Mg(OH)2 and soluble Mg(HCO3)2

2019 ◽  
Vol 6 (2) ◽  
pp. 467-477 ◽  
Author(s):  
Xueming Liu ◽  
Kainan Song ◽  
Weizhen Liu ◽  
Yuecheng Xiong ◽  
Yunyun Xu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
New Technique ◽  
Phase Transformation Process ◽  
A New Technique ◽  
Reversible Phase ◽  
Removal And Recovery

This study investigated the effectiveness of a new technique for recovering Pb as highly pure PbCO3 nanoparticles from wastewater by using a nano-Mg(OH)2 adsorbent.

Phase transformation process of Tb2O3 at elevated temperature

2019 ◽  
Vol 171 ◽  
pp. 108-111 ◽  
Author(s):  
Junyu Zhang ◽  
Hetuo Chen ◽  
Junping Wang ◽  
Dewen Wang ◽  
Dan Han ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Elevated Temperature ◽  
Transformation Process ◽  
Phase Transformation Process

scholarly journals Systematic study of TiO2/ZnO mixed metal oxides for CO2 photoreduction

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21660-21666 ◽  
Author(s):  
Warren A. Thompson ◽  
Alberto Olivo ◽  
Danny Zanardo ◽  
Giuseppe Cruciani ◽  
Federica Menegazzo ◽  
...  
Keyword(s):  
Design Of Experiments ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Systematic Study ◽  
Mixture Design ◽  
Mixed Metal Oxide ◽  
Mixed Metal Oxides ◽  
Systematic Design ◽  
Co2 Photoreduction ◽  
Mixed Metal

A novel example using a systematic design of experiments mixture design for developing mixed metal oxide photocatalysts for CO2 photoreduction.

Phase Transformation during the Hot Pressing of WC-40vol.% Al2O3 Composites

2012 ◽  
Vol 152-154 ◽  
pp. 260-265 ◽  
Author(s):  
Hai Xia Qu ◽  
Shi Gen Zhu
Keyword(s):  
Phase Transformation ◽  
Hot Pressing ◽  
Metal Particle ◽  
High Energy ◽  
Transformation Process ◽  
Matrix Composites ◽  
Pressing Temperature ◽  
Phase Transformation Process ◽  
Vacuum Degree ◽  
Energy Ball

WC matrix composites toughened by commercial Al2O3composed of AlOOH, χ-Al2O3and amorphous Al2O3were prepared by high energy ball milling and then hot pressed at 769°C, 984°C, 1100°C, 1540°C for 90min, respectively, to investigate the phase transformation process. Microstructure and mechanical properties of WC-40vol.%Al2O3composites were studied as well. The results showed that, with the increasing hot pressing temperature, the commercial Al2O3 transformed to α-Al2O3completely through γ-Al2O3. WC could be oxidized and decarburized to W, C and W2C at low temperature when the vacuum degree was very low. The existence of W in the composites sintered at 1540°C for 90min could contribute to a metal particle toughening effect to the composites, resulting in the achievement of an excellent fracture toughness of 10.43MPa•m1/2, combining a Vickers hardness of 18.65GPa with a relative density of 97.98% for WC-40vol.%Al2O3composites.

A new polymorph of Cd3B2O6: synthesis, crystal structure and phase transformation

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 13195-13200 ◽  
Author(s):  
Xingwen Zhang ◽  
Hongwei Yu ◽  
Hongping Wu ◽  
Shilie Pan ◽  
Anqing Jiao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
High Temperature ◽  
Transformation Process ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Phase Transformation Process

A new high-temperature phase of Cd3B2O6 (β-Cd3B2O6) has been discovered and the phase transformation process between α- and β-Cd3B2O6 was investigated.

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