Synthesis of cymene in flow reactor over rare earth metal modified zeolite catalyst

2020 ◽  
Vol 18 (4) ◽  
Author(s):  
Ruchika Thakur ◽  
Gopinath Halder ◽  
Sanghamitra Barman
Keyword(s):  
Rare Earth ◽  
Flow Reactor ◽  
Earth Metal ◽  
Space Time ◽  
Zeolite Catalysts ◽  
Reactant Ratio ◽  
Reaction Conditions ◽  
Modified Zeolite ◽  
X Zeolite ◽  
Cumene Conversion

AbstractIn the present investigation transalkylation of cumene with toluene was carried over a series of zeolite containing rare earth metals such as lanthanum (La), cerium (Ce), and praseodymium (Pr). The modified zeolites were further characterized by EDS, XRD, BET and TPD. The surface area and acidities of the modified zeolite catalysts were reported. The transalkylation reactions were carried out varying different parameters such as metal loading (2–10 wt%), temperature (448–573 K), reactant ratio (1–15), and space-time (3.2–9.29 kg h/kmol). Praseodymium-modified X zeolite (PrX) showed the highest cumene conversion (60 wt%) and cymene selectivity (65.7 wt%) compared to the other zeolites. The maximum cumene conversion and cymene selectivity were obtained at 523 K, the toluene-to-cumene ratio of 9:1, and space-time of 9.29 kg h/kmol. Mass transfer resistances were studied in the said reaction conditions.

An Unexpected Coupling Reaction of 8-Quinolinolate at Elevated Temperature

2014 ◽  
Vol 67 (9) ◽  
pp. 1251 ◽  
Author(s):  
Glen B. Deacon ◽  
Craig M. Forsyth ◽  
Olga Gazukin ◽  
Peter C. Junk ◽  
Gerd Meyer ◽  
...  
Keyword(s):  
Rare Earth ◽  
Nickel Powder ◽  
Rare Earth Metals ◽  
Earth Metal ◽  
Coupling Reaction ◽  
Synthetic Approach ◽  
Cobalt Powder ◽  
Reaction Conditions ◽  
Homoleptic Complex ◽  
Smco5 Alloy

Reactions of 8-hydroxyquinoline (HOQ) with elemental rare-earth and transition metal combinations or alloys at 200–300°C yielded a variety of complexes, albeit in very low yields, including two structurally characterised homometallic complexes containing an unexpected biquinolinolate ligand. Reaction of HOQ with SmCo5 alloy gives rise to the complexes [SmCo2(OQ)7] (1), [Co4(OQ)4(BQ)2] (2), and [Sm3(OQ)5(BQ)2(H2O)] (3Sm), where BQ is 2,7′-biquinoline-8,8′-diolate, resulting from an unusual coupling reaction between two OQ/HOQ species at the 2 and 7′ positions. Complexes 1–3 and HOQ co-crystal 2·2HOQ were isolated as single crystals from separate reactions although formation of other products under the reaction conditions used was likely. Analogues of 3Sm with erbium and ytterbium were obtained using respective rare-earth metal filing in combination with nickel powder. Reaction involving cobalt powder only, without any rare-earth metals, yielded a homoleptic complex containing only the 8-quinolinolate ligand i.e. [Co4(OQ)8] (4). These results highlight the rewards, in terms of rich synthetic chemistry, and pitfalls, in terms of yield and isolation, of the pseudo-solid state synthetic approach using 8-quinolinolate ligands.

An Efficient Catalyst System at Mild Reaction Conditions Containing Rare Earth Metal Complexes

2013 ◽  
Vol 60 (12) ◽  
pp. 1463-1466 ◽  
Author(s):  
Wen-Zhen Wang ◽  
Yang Wu ◽  
Yan-Shan Duan ◽  
Jun-Tao Zhang ◽  
Peng-Hui Yang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Complexes ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Catalyst System ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Rare Earth Metal Complexes

Phase selectivity and tunable photophysical nature of rare earth metal–organic frameworks of EuxY1−x-PTC (H3PTC = 2,4,6-pyridine tricarboxylic acid; x = 0–1)

2020 ◽  
Vol 49 (42) ◽  
pp. 14985-14994
Author(s):  
Xu-Sheng Gao ◽  
Mei-Juan Ding ◽  
Jin Zhang ◽  
Li-Duo Zhao ◽  
Xiao-Ming Ren
Keyword(s):  
Rare Earth ◽  
Solid Solutions ◽  
Rare Earth Metal ◽  
Metal Organic Frameworks ◽  
Earth Metal ◽  
Tricarboxylic Acid ◽  
Excitation Wavelength ◽  
Metal Organic ◽  
Phase Selectivity

All solid solutions (EuxY1−x-PTC, x = 0.013–0.82) are isomorphic to Eu-PTC, but different from Y-PTC, and show phase selectivity as well as excitation wavelength dependent emission.

scholarly journals Experimental Investigation of WE54 magnesium rare earth metal alloys by ageing treatment

2021 ◽  
Vol 1104 (1) ◽  
pp. 012025
Author(s):  
Sachendra ◽  
Shailesh Kumar Singh ◽  
Ujjwal ◽  
Satyajeet Kumar ◽  
Kuldeep Singh
Keyword(s):  
Experimental Investigation ◽  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Metal Alloys ◽  
Ageing Treatment

scholarly journals High-pressure synthesis of REB5O8(OH)2 (RE = Ho, Er, Tm)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Michael Zoller ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Ir Spectroscopy ◽  
Earth Metal ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Solution ◽  
Pressure Synthesis ◽  
The Rare Earth

AbstractThe rare earth oxoborates REB5O8(OH)2 (RE = Ho, Er, Tm) were synthesized in a Walker-type multianvil apparatus at a pressure of 2.5 GPa and a temperature of 673 K. Single-crystal X-ray diffraction data provided the basis for the structure solution and refinement. The compounds crystallize in the monoclinic space group C2 (no. 5) and are composed of a layer-like structure containing dreier and sechser rings of corner sharing [BO4]5− tetrahedra. The rare earth metal cations are coordinated between two adjacent sechser rings. Further characterization was performed utilizing IR spectroscopy.

Phosphorylated-calix[4]arene double-deckers of single rare earth metal ions

2021 ◽  
Author(s):  
Marjan Hosseinzadeh ◽  
Sergio Sanz ◽  
Jan van Leusen ◽  
Natalya V Izarova ◽  
Euan K Brechin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Double Decker ◽  
Organic Framework

Combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO) directs the formation of homoleptic double-decker complexes [LnIII(LPO)2](O3SCF3)3 for Ln = Tb and Dy, with the latter displaying...

Deep-ultraviolet transparent alkali metal-rare earth metal sulfate NaY(SO4)2.H2O as a nonlinear optical crystal: synthesis and characterization

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chao Wu ◽  
Lin Lin ◽  
Tianhui Wu ◽  
Zhipeng Huang ◽  
Chi Zhang
Keyword(s):  
Rare Earth ◽  
Alkali Metal ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Synthesis And Characterization ◽  
Nonlinear Optical Crystal ◽  
Metal Sulfate ◽  
Deep Ultraviolet ◽  
Crystal Synthesis ◽  
Optical Crystal

A new alkali metal-rare earth metal sulfate with the formula NaY(SO4)2.H2O has been synthesized using a mild hydrothermal method. It crystallizes in the noncentrosymmetric trigonal space group P3121 (No. 152)...

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